Its compact size allows for space-saving installation.

Mounting diameter R1/2; Installation piping R3/4

These are the sensors (measuring components) for the 7773 series and 7737/7738.
The cables are connected via connectors for easy installation.
Please select the appropriate sensor based on the thread diameter (R3/4 or R1/2) of the piping you intend to install it on.

Product Specifications

Model	7770-S300		7770-S400
Product image
Electrode material	SUS-316		SUS-316
Body material	PPS		PPS
Connector connection	Dedicated connector connection		Dedicated connector connection
screw-in diameter	R1/2		R3/4
Mounting piping material	Resin and metal piping		Resin and metal piping
Operating pressure	0.5MPa or less		0.5MPa or less
temperature	0-90℃		0-90℃
Compatible water quality meter	7773 Series Sensingeye737 Sensingeye738		7773 Series Sensingeye737 Sensingeye738
Sensor cable	5m dedicated cable		5m dedicated cable

Product Features

The 7770-S300/7770-S400
features a connector connection type designed for ease of installation.
The cylindrical sensor allows for connection to metal piping, enabling stable water quality measurement.

With its four-electrode system, it can measure water quality even in high-concentration ranges.

Installation piping R3/4

This sensor is for use with the 7735 when measuring high concentrations.
It employs a 4-electrode sensor that is resistant to dirt and polarization, making it ideal for measuring high concentrations of liquid fertilizers, wastewater, and other liquids. It
also supports immersion-type measurements in tanks and other containers.

Product-compatible water quality

Product usage

Product Specifications

Model	7735-S110
Product image
Electrode material	SUS-316
Body material	PPS
Connector connection	none
screw-in diameter	R3/4
Mounting piping material	Metal and resin piping Tank dunking
Operating pressure	0.5MPa or less
temperature	0-50℃
Compatible water quality meter	7735 series
Sensor cable	Direct cable 5m

Product Features

The 7735-S110
is ideal for measuring high-concentration water quality. It is highly resistant to contamination and has minimal impact on measurement results.

It offers excellent responsiveness to heat, enabling accurate measurements even in environments with drastic temperature changes.

Mounting diameter R1/2; Installation piping R3/4; Electrode part: Titanium

These are sensors (measuring components) for the 7731/32, 7721/22, and 7741/7742/7735 series.
The cables are connector-connected for easy installation.
You can select the appropriate sensor based on the material (metal/plastic) and thread diameter (R3/4/R1/2) of the piping you will be installing it on.
A separate sensor cable is required.
Please refer to the page for the dedicated cable for the 7701 sensor.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Electrode material	titanium	titanium	titanium	titanium	titanium
Body material	SUS-316L	SUS-316L	SUS-316L	Heat-resistant PVC	SUS-316L
Connector connection	None (direct cable connection)	Protection class IP67	Protection class IP67	Protection class IP67	Protection class IP67
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	Resin piping, tank submersion (△)	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	0.5m + dedicated cable Dedicated cable selection: 7701-C005 (5m), 7701-C010 (10m), 7701-C015 (15m), 7701-C020 (20m)	0.5m + dedicated cable Dedicated cable selection: 7701-C005 (5m), 7701-C010 (10m), 7701-C015 (15m), 7701-C020 (20m)	Dedicated cable options: 7701-C005 (5m), 7701-C010 (10m), 7701-C015 (15m), 7701-C020 (20m)	Dedicated cable options: 7701-C005 (5m), 7701-C010 (10m), 7701-C015 (15m), 7701-C020 (20m)

Product Features

The 7701-S300
body has a Teflon coating on its surface.
Its excellent heat responsiveness allows for accurate measurements even in environments with drastic temperature changes.

The 7701-S310
is a relay connector type designed for ease of installation.
The body is coated with Teflon.
Its excellent heat responsiveness allows for accurate measurements even in environments with drastic temperature changes.

The 7701-S600
type features an insulated body and electrodes, eliminating the need for insulation treatment when attaching to metal piping. It’s
a relay connector type designed for ease of installation.

The 7701-S400
body uses heat-resistant PVC, eliminating the need for insulation.
It is a direct-connection type designed for ease of installation. The 7701-S500
body has a Teflon coating on its surface.
Its excellent heat responsiveness allows for accurate measurements even in environments with drastic temperature changes.
It features a direct-connect connector for ease of installation.

Industry’s thinnest compact electrical conductivity meter

confirmation; dc power supply; DIN rail mounting; No water quality information provided; Analog output

This is an ultra-thin electrical conductivity (conductivity) measurement module.
With a width of just 26mm, it’s one of the thinnest electrical conductivity (conductivity) measurement modules in the industry, allowing for space-saving installation in control panels and other applications.
It features analog output (4-20mA) and can output two parameters: water quality and water temperature.
The use of a plug-in terminal block reduces installation time.
Please use it in combination with the 7770 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7738-A100
Measurement range	0 to 50mS/m (0 to 500μS/cm)
Product size	W26 × H100 × D80 mm
output	Analog output: 4-20mA DC (2 points)
power supply	DC24V (3.5W or less)
Measured water temperature	5-90℃
Usage environment	Ambient temperature 0-50°C / Humidity 5-80%RH (non-condensing)
Included sensor	7770-S300 (R1/2) S400 (R3/4)
others	Analog output for both water quality and water temperature Includes dedicated sensor for immediate use after purchase; DIN rail mounting Single sensor input

Compatible sensors

Please select from the 7770 sensor series based on the diameter of the piping to which it will be installed.

Model	7770-S300		7770-S400
Product image
Mounting pipe diameter	R1/2		R3/4
Mounting piping material	Resin and metal piping		Resin and metal piping
Operating pressure	0.5MPa or less		0.5MPa or less
temperature	0-75℃		0-75℃
Sensor cable	5m dedicated cable		5m dedicated cable

The industry’s thinnest, most compact electrical resistivity meter (resistivity meter)

confirmation; dc power supply; DIN rail mounting; No water quality information provided; Analog output

This is an ultra-thin electrical resistivity (resistivity) measurement module.
With a width of just 26mm, it’s one of the thinnest electrical resistivity (resistivity) measurement modules in the industry, allowing for space-saving installation in control panels and other applications.
It features analog output (4-20mA) and can output two parameters: water quality and water temperature.
The use of a plug-in terminal block reduces installation time.
Please use it in combination with the 7770 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7737-A100
Measurement range	0 to 20.00 MΩ･cm
Product size	W26 × H100 × D80mm
output	Analog output: 4-20mA DC (2 points)
power supply	DC24V (3.5W or less)
Measured water temperature	5-90℃
Usage environment	Ambient temperature 0-50°C / Humidity 5-80%RH (non-condensing)
Compatible sensors	7770-S300 (R1/2) S400 (R3/4)
others	Analog output for both water quality and water temperature Includes dedicated sensor for immediate use after purchase; DIN rail mounting Single sensor input

Compatible sensors

Please select from the 7770 sensor series based on the diameter of the piping to which it will be installed.

Model	7770-S300		7770-S400
Product image
Mounting pipe diameter	R1/2		R3/4
Mounting piping material	Resin and metal piping		Resin and metal piping
Operating pressure	0.5MPa or less		0.5MPa or less
temperature	0-75℃		0-75℃
Sensor cable	5m dedicated cable		5m dedicated cable

A high-precision electrical conductivity meter capable of simultaneously measuring electrical conductivity at two locations.

management; High precision measurement; Proofreading support; Alarm; AC power supply; dc power supply; Serial communication; Panel mounting; Water quality information available; Analog output; Simultaneous measurement at two locations

This is a highly accurate electrical conductivity meter.
It can connect to two sensors, allowing for simultaneous measurement of water quality at two locations.
It features a variety of external outputs, including alarm output, analog output, and serial communication.
It can be used in a wide range of industries and applications, from measuring pure water and RO water to managing the concentration of cooling water and circulating water.

Product-compatible water quality

Product usage

Product Specifications

Model	7722-A100N	7722-A102N	7722-A202N
Measurement range	0 to 500.0 μS/cm	0 to 20.0 μS/cm
Product size	W96 × H96 × D164 mm ; Panel mounting hole diameter: 92 mm ; Recommended panel thickness: 1.6 to 2.3 mm
accuracy	Repeatability: ±0.5% FS
Electrode input	Up to 2 items
output	Alarm output: Connection to external device / 2 points (C-contact) Analog output: 4-20mA / 2 outputs Digital output: 2-wire RS-485 / 1 channel
power supply	A100 series: AC 85-264V 50/60Hz A200 series: DC 24V ±10%
Power consumption	8.5W or less
Measured water temperature	0 to 100°C
temperature compensation	Digital temperature compensation
Usage environment	Ambient temperature 0-50°C / Humidity 5-80%RH (non-condensing)
others	Data from up to 15 water quality meters can be acquired from a single host via communication (RS-485). A single multi-function water quality meter can measure water quality at two locations . Panel mount display included. Two sensor inputs.

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

A high-precision electrical resistivity meter (resistivity meter) capable of simultaneously measuring the electrical resistivity at two locations.

management; High precision measurement; Proofreading support; Alarm; AC power supply; dc power supply; Serial communication; Panel mounting; Water quality information available; Analog output; Simultaneous measurement at two locations

This is a highly accurate electrical resistivity meter (resistivity meter).
It can connect to two sensors, allowing for simultaneous measurement of water quality at two locations with a single unit.
It features a variety of external outputs, including alarm output, analog output, and serial communication.
This electrical resistivity meter (resistivity meter) is ideal for measuring pure and ultrapure water used in semiconductor and pharmaceutical applications.
Please use it in combination with the 7701 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7721-A100N		7721-A200N
Measurement range (automatic temperature compensation)	0 to 20.00 MΩ･cm
Product size	W96 × H96 × D164 mm ; Panel mounting hole diameter: 92 mm ; Recommended panel thickness: 1.6 to 2.3 mm
accuracy	Repeatability: ±0.5% FS
Electrode input	Up to 2 items
output	Alarm output: Connection to external device / 2 points (C-contact) Analog output: 4-20mA / 2 outputs Digital output: 2-wire RS-485 / 1 channel
power supply	A100 series: AC 85-264V 50/60Hz A200 series: DC 24V ±10%
Power consumption	8.5W or less
Measured water temperature	0 to 100°C
temperature compensation	Digital temperature compensation
Usage environment	Ambient temperature 0-50°C / Humidity 5-80%RH (non-condensing)
others	Data from up to 15 water quality meters can be acquired from a single host via communication (RS-485). A single multi-function water quality meter can measure water quality at two locations . Panel mount display included. Two sensor inputs.

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

R1/4 connection port; amplifier-integrated electrical conductivity sensor, ideal for integration into small devices.

confirmation; Amplifier and sensor integrated; dc power supply; No water quality information provided; Analog output; Installation piping R1/4

This is an ultra-compact amplifier-integrated electrical conductivity sensor (conductivity sensor).
Its R1/4 connector size allows for space-saving installation.
Equipped with an analog output (4-20mA), it can be combined with control and display devices such as PLCs for water quality measurement and management.
It supports high water temperatures up to 90°C, making it suitable for use in medical and food processing equipment requiring hot water disinfection. (Pressure resistance requirements apply.)

Amplifier-integrated electrical resistivity sensor with serial communication and alarm output functions.

Mounting piping G1/2; confirmation; Amplifier and sensor integrated; dc power supply; Serial communication; No water quality information provided; Analog output; Mounting diameter R1/2

This is an ultra-compact amplifier-integrated electrical resistivity sensor (resistivity sensor).
The screw-in portion is small (R1/2, G1/2), allowing for space-saving installation.
The A1XX and A3XX series feature analog output (4-20mA), while the A2XX and A4XX series have serial communication and alarm output,
enabling water quality measurement and management in combination with control and display devices such as PLCs.
It supports high water temperatures up to 90°C, making it suitable for use in medical and food processing equipment requiring hot water disinfection.
The electrode structure (cylindrical electrode) is less susceptible to the effects of metal piping, allowing for direct screw-in into metal conduits.

Product-compatible water quality

Amplifier-integrated electrical conductivity sensor with serial communication and alarm output functions.

Mounting piping G1/2; confirmation; Amplifier and sensor integrated; dc power supply; No water quality information provided; Analog output; Mounting diameter R1/2

This is an ultra-compact, amplifier-integrated electrical conductivity sensor (conductivity sensor).
The screw-in portion is small (R1/2, G1/2), allowing for space-saving installation.
The A1XX and A3XX series feature analog output (4-20mA), while the A2XX and A4XX series have serial communication and alarm output, enabling water quality measurement and management in combination with control and display devices such as PLCs.
It supports high water temperatures up to 90°C, making it suitable for use in medical and food processing equipment requiring hot water disinfection.
The electrode structure (cylindrical electrode) is less susceptible to the effects of metal piping, allowing for direct screw-in into metal conduits.

Product-compatible water quality

Battery-operated water quality indicator for cartridge-type pure water systems.

confirmation; Amplifier and sensor integrated; battery operated; Mounting diameter R1/2; Lamp type

This is an amplifier-integrated electrical conductivity sensor (conductivity sensor) for managing cartridge-type pure water systems.
It indicates the status of the cartridge-type pure water system with a 4-stage LED indicator.
Since it’s battery-operated, it can be easily installed even in locations without a power source.

Industry’s smallest, most compact electrical conductivity meter (conductivity meter)

management; High precision measurement; Proofreading support; Alarm; AC power supply; dc power supply; Serial communication; Panel mounting; Water quality information available; Analog output

This is a highly accurate electrical conductivity meter. Its
compact size (W48 x H96 x D101mm) allows for space-saving installation in control panels and other locations.
It features a variety of external outputs, including alarm output, analog output, and serial communication. It
can be used in a wide range of industries and applications, from measuring pure water and RO water to managing the concentration of cooling water and circulating water.
Please use it in combination with the 7701 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7732-A152	7732-A252	7732-A112	7732-A212	7732-A121	7732-A221
Measurement range	0 to 500.0 μS/cm		0 to 100.0 μS/cm		0 to 20.0 μS/cm
Product size	W48×H96×D101mm
accuracy	Measurement accuracy: ±0.5% FS (at 25°C water temperature) Repeatability: ±0.5% FS (at equivalent resistance)
output	Alarm output: 2 points (c-contact) Analog output: 4-20mA DC Digital output: RS-485 (ModbusRTU)
power supply	A100 Series: AC 85-265V / 47-440Hz (5W or less) A200 Series: DC 24V ±10%
Measured water temperature	0 to 100°C
temperature compensation	Digital temperature compensation
Usage environment	Ambient temperature 5-50°C / Humidity 5-80%RH (non-condensing)
others	Monitoring and various settings can be changed via communication (RS-485). RoHS2 compliant. Panel mount display included. Single sensor input.

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

Industry’s smallest, most compact electrical resistivity meter (resistivity meter).

Management; High precision measurement; Proofreading support; Alarm; AC power supply; dc power supply; Serial communication; Panel mounting; Water quality information available; Analog output.

This is a highly accurate electrical resistivity meter (resistivity meter).
Its compact size (48W x 96H x 101D mm) allows for space-saving installation in control panels and other locations.
It features a variety of external outputs, including alarm output, analog output, and serial communication.
This electrical resistivity meter (resistivity meter) is ideal for measuring pure and ultrapure water used in semiconductor and pharmaceutical applications.
Please use it in combination with the 7701 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7731-A120	7731-A220	7731-A121	7731-A221
Measurement range	0 to 2,000 MΩ·cm		0 to 20.00 MΩ･cm
Product size	W48×H96×D101mm
accuracy	Measurement accuracy: ±0.5% FS (at 25°C water temperature) Repeatability: ±0.5% FS (at equivalent resistance)
output	Alarm output: 2 points (c-contact) Analog output: 4-20mA DC Digital output: RS-485 (ModbusRTU)
power supply	A100 Series: AC 85-265V / 47-440Hz (5W or less) A200 Series: DC 24V ±10%
Measured water temperature	0 to 100°C
temperature compensation	Digital temperature compensation
Usage environment	Ambient temperature 5-50°C / Humidity 5-80%RH (non-condensing)
others	Monitoring and various settings can be changed via communication (RS-485). RoHS2 compliant. Panel mount display included. Single sensor input.

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

Electrical conductivity (electrical conductivity) measurement module

Surveillance; High precision measurement; Proofreading support; DC power supply; DIN rail mounting; No water quality information provided; Analog output; Measurement range is switchable.

This is a slim electrical conductivity (conductivity) measurement module.
It features an analog output (4-20mA) and allows for dual output of water quality and water temperature.
Its slim and compact design allows for space-saving installation in control panels and other applications.
The measurement range can be switched using the DIP switches on the front panel (0-4/0-20/0-200/0-400μS/cm).
It can be used in a wide range of industries and applications, from measuring pure water and RO water to managing the concentration of cooling water and circulating water.
Please use it in combination with the 7701 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7742-A100
Measurement range	0~4μS/cm 0~20μS/cm 0~200μS/cm 0~400μS/cm
Product size	W36 x H95 x D78.3 (including terminal block)
output	Electrical resistivity: 4-20mA (selectable range: 0-FS) Water temperature: 4-20mA (0-100℃)
power supply	DC24V±10%
Measured water temperature	0 to 100°C
Usage environment	Ambient temperature 0-50°C, Ambient humidity 5-80%RH (non-condensing)
Compatible sensors	Using the 7701 sensor series: 0 to 100°C (7701-S400 only: 0 to 80°C)
others

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

Thin water quality measurement module

Surveillance; High precision measurement; Proofreading support; DC power supply; DIN rail mounting; No water quality information provided; Analog output.

This is a slim electrical resistivity (resistivity) measurement module.
It features analog output (4-20mA) and allows for dual output of water quality and water temperature.
Its slim and compact design contributes to space saving in control panels and other applications. This
electrical resistivity (resistivity) measurement module is ideal for measuring pure and ultrapure water used in semiconductor and pharmaceutical applications.
Please use it in combination with the 7701 sensor series.

Product-compatible water quality

Product usage

Product Specifications

Model	7741-A100
Measurement range (automatic temperature compensation)	0–20 MΩ·cm
Product size	W36 x H95 x D78.3 (including terminal block)
output	Electrical resistivity: 4–20mA (0–20MΩ·cm) Water temperature: 4–20mA (0–100℃)
power supply	DC24V±10% (5W or less)
Measured water temperature	0 to 100°C
Usage environment	Ambient temperature 0-50°C, Ambient humidity 5-80%RH (non-condensing)
Compatible sensors	Using the 7701 sensor series: 0 to 100°C (7701-S400 only: 0 to 80°C)
others

Compatible sensors

Please select based on the pipe diameter, material, operating temperature, and pressure of the piping to be installed.

Model	7701-S300	7701-S310	7701-S600	7701-S400	7701-S500
Product image
Mounting pipe diameter	R3/4	R3/4	R3/4	R1/2	R1/2
Mounting piping material	resin piping	resin piping	Resin and metal piping	Resin and metal piping	resin piping
Operating pressure	1.5MPa or less	1.5MPa or less	1.5MPa or less	0.5MPa or less	1.5MPa or less
temperature	0-100℃	0-100℃	0-100℃	0-80℃	0-100℃
Sensor cable	Directly attached cable, 5m	Separately	Separately	Separately	Separately

Quick-joint structure, ideal for integration into small devices, amplifier-integrated electrical conductivity sensor.

Quick joint connection; confirmation; Amplifier and sensor integrated; DC power supply; No water quality information provided; Analog output.

This is an ultra-compact, amplifier-integrated electrical conductivity sensor (conductivity sensor).
Its quick-joint structure makes connection easy.
Equipped with an analog output (4-20mA), it can be combined with control and display devices such as PLCs for water quality measurement and management.
It supports high water temperatures up to 90°C, making it suitable for use in medical and food processing equipment requiring hot water disinfection. (Pressure resistance requirements apply)

Amplifier-integrated water quality sensor dedicated multi-indicator

Surveillance; Alarm; AC power supply; DC power supply; Serial communication; Panel mounting; Water quality information available; Analog output.

The Sensing eye 871 is an indicator specifically designed for integrated amplifier water quality sensors.
It can be installed in a space-saving manner on control panels.
It features a variety of external outputs, including alarm output, analog output, and serial communication.
It also includes an external input for linking with external devices such as flow sensors.

Product-compatible water quality

Product usage

Product Specifications

Model	7871-A100
Display items	Water quality (electrical resistivity, electrical conductivity), water temperature, instantaneous flow rate, cumulative flow rate
Product size	W96 × H96 × D86 mm ; Panel mounting hole opening: 92 mm ; Recommended panel thickness: 1.6 to 2.3 mm
display	7-segment LED: 4 digits Units: MΩ・cm, μS/cm, °C, L/min, m³
output	Alarm output: 1a contact relay, 1 point, AC125V/0.3A, DC24V/1A (resistive load) Transmission output: 4 – 20 mA DC, 1 point Communication function: RS-485 × 1
power supply	DC24V ± 5%
External input	Voltage-free a-contact, NPN open collector, 1 point Pulse-compatible (maximum 1 kHz, DC 24V 500mA supply possible)
Humidity temperature	0-50℃
Ambient humidity	5-80% RH (but no condensation)
Material	PPE
Compatible sensors (sold separately)	7785-A221, 7786-A200 series
option	Mounting bracket, 2 mounting screws, 2 fixing bolts, AC adapter

Compatible sensors

Please select from the 7785/7786 series based on the pipe diameter and material of the piping to be installed.

Model	7785-A221	7786-A213	7786-A252	7786-A251	7786-A221
Product image
Mounting pipe diameter	R1/2	R1/2	R1/2	R1/2	R1/2
Mounting piping material	Resin and metal piping	Resin and metal piping	Resin and metal piping	Resin and metal piping	Resin and metal piping
Operating pressure	0.5MPa or less	0.5MPa or less	0.5MPa or less	0.5MPa or less	0.5MPa or less
temperature	5-90℃	5-90℃	5-90℃	5-90℃	5-90℃
Sensor cable	Includes a 2m dedicated cable.	Includes a 2m dedicated cable.	Includes a 2m dedicated cable.	Includes a 2m dedicated cable.	Includes a 2m dedicated cable.

An electrical conductivity meter (conductivity meter) is one of the indicators of water quality. By measuring the value of the current flowing between electrodes, it is possible to determine whether the water is highly pure or contains many impurities. The more impurities (ionic molecules) there are in the water, the easier it is for current to flow, and the higher the value will be. The unit commonly used is [μS/cm] (microsiemens per centimeter). It is used in a wide range of industries for various applications, from managing pure water used in the manufacturing processes of pharmaceuticals and drinking water, to concentration control of cooling water and circulating water, and management of liquid fertilizers and wastewater.

Water quality measurement module

Surveillance; High concentration measurement possible

This is an electrical conductivity (conductivity) measurement module.
It features an analog output (4-20mA) and provides a single output for water quality.
Its slim and compact design allows for space-saving installation in control panels and other locations.
It can measure high concentrations up to 20,000 μS/cm.
It can be used for applications such as wastewater and liquid fertilizer management.

Product-compatible water quality

Product usage

Product Specifications

Model	7744-A100
Measurement range	0 to 2,000, 0 to 5,000, 0 to 10,000, 0 to 20,000 μS/cm
Measured water temperature	0 to 50°C
Measurement accuracy	±1.0%FS or less
Repeatability	±1.0%FS or less
Measured water temperature	5 to 50°C
Measurement output signal	Measurement output: 4 – 20 mA (1 point)
Digital output	RS-485 (Modbus RTU)
power supply	DC24V ± 10% 3W or less
Product size	W36 × D81.9 × H95 mm (including terminal block)
Humidity temperature	0 to 50°C
Ambient humidity	Humidity 5-80% RH (but no condensation)
Compatible sensors	7735-S120

Compatible sensors

Model	7735-S120
Product image
Mounting pipe diameter	R3/4
Mounting piping material	Metal and resin piping Tank dunking
Operating pressure	0.5MPa or less
temperature	0-50℃
Sensor cable	Directly attached cable, 5m

Features

Features

This sensor is for use with the 7735 when measuring high concentrations.
It employs a 4-electrode sensor that is resistant to dirt and polarization, making it ideal for measuring high concentrations of liquid fertilizers, wastewater, and other liquids. It
also supports immersion-type measurements in tanks and other containers.

Features

These are the sensors (measuring parts) for the 7773 series and 7737/7738.
The cables are connected via connectors for easy installation.
Please select the appropriate sensor based on the thread diameter of the piping you will be installing it on (R3/4 or R1/2).

Features

These are sensors (measuring components) for the 7731/32, 7721/22, and 7741/7742/7735 series.
The cables are connector-connected for easy installation.
You can select the appropriate sensor based on the material (metal/plastic) and thread diameter (R3/4/R1/2) of the piping you will be installing it on.
A separate sensor cable is required.

Features

This is an ultra-thin electrical conductivity (conductivity) measurement module.
With a width of just 26mm, it’s one of the thinnest electrical conductivity (conductivity) measurement modules in the industry, allowing for space-saving installation in control panels and other applications.
It features analog output (4-20mA) and can output two parameters: water quality and water temperature.
The use of a plug-in terminal block reduces installation time.
Please use it in combination with the 7770 sensor series.

Features

A cost-effective electrical conductivity indicator (conductivity indicator)

Specifications

Features

A high-precision electrical conductivity meter capable of simultaneously measuring electrical conductivity at two locations.

Specifications

Features

This is an ultra-thin electrical resistivity (resistivity) measurement module.
With a width of just 26mm, it’s one of the thinnest electrical resistivity (resistivity) measurement modules in the industry, allowing for space-saving installation in control panels and other applications.
It features analog output (4-20mA) and can output two parameters: water quality and water temperature.
The use of a plug-in terminal block reduces installation time.
Please use it in combination with the 7770 sensor series.

Specifications

Features

A high-precision electrical resistivity meter (resistivity meter) capable of simultaneously measuring the electrical resistivity at two locations.

Features

This is an electrical conductivity indicator (conductivity indicator) for managing cartridge-type pure water systems.
It features an external input for linking with external devices such as alarm outputs and flow sensors.
A dedicated sensor and mounting hardware are included, so you can start measuring water quality immediately after purchase.

Features

This is an electrical conductivity indicator (conductivity indicator) for monitoring cartridge-type pure water systems. Since it’s battery-operated, it can be easily installed even in locations without a power source. It comes with a dedicated sensor and mounting hardware, so you can start measuring water quality immediately after purchase.

Features

This is an electrical conductivity (electrical conductivity) measurement module.
It features analog output (4-20mA) and can output two parameters: water quality and water temperature.
Its slim and compact design allows for space-saving installation in control panels and other locations.
It can measure high concentrations up to 10,000 μS/cm.
It can be used for applications such as wastewater and liquid fertilizer management.

Features

Amplifier-integrated electrical resistivity sensor with serial communication and alarm output functions.

Features

Amplifier-integrated electrical conductivity sensor with serial communication and alarm output functions.

Features

R1/4 connection port; amplifier-integrated electrical conductivity sensor, ideal for integration into small devices.

Features

This is an amplifier-integrated electrical conductivity sensor (conductivity sensor) for managing cartridge-type pure water systems.
It indicates the status of the cartridge-type pure water system with a 4-stage LED indicator.
Since it’s battery-operated, it can be easily installed even in locations without a power source.

Features

This is a highly accurate electrical conductivity meter. Its
compact size (W48 x H96 x D101mm) allows for space-saving installation in control panels and other locations.
It features a variety of external outputs, including alarm output, analog output, and serial communication. It
can be used in a wide range of industries and applications, from measuring pure water and RO water to managing the concentration of cooling water and circulating water.
Please use it in combination with the 7701 sensor series.

Features

This is a highly accurate electrical resistivity meter (resistivity meter).
Its compact size (48W x 96H x 101D mm) allows for space-saving installation in control panels and other locations.
It features a variety of external outputs, including alarm output, analog output, and serial communication.
This electrical resistivity meter (resistivity meter) is ideal for measuring pure and ultrapure water used in semiconductor and pharmaceutical applications.
Please use it in combination with the 7701 sensor series.

Features

This is a slim electrical conductivity (conductivity) measurement module.
It features an analog output (4-20mA) and allows for dual output of water quality and water temperature.
Its slim and compact design allows for space-saving installation in control panels and other applications.
The measurement range can be switched using the DIP switches on the front panel (0-4/0-20/0-200/0-400μS/cm)
. It can be used in a wide range of industries and applications, from measuring pure water and RO water to managing the concentration of cooling water and circulating water.
Please use it in combination with the 7701 sensor series.

Features

This is a slim electrical resistivity (resistivity) measurement module. It features analog output (4-20mA) and allows for dual output of water quality and water temperature.
Its slim and compact design contributes to space saving in control panels and other applications. This
electrical resistivity (resistivity) measurement module is ideal for measuring pure and ultrapure water used in semiconductor and pharmaceutical applications.
Please use it in combination with the 7701 sensor series.

Features

This is an ultra-compact, amplifier-integrated electrical conductivity sensor (conductivity sensor). Its quick-joint structure makes connection easy. Equipped with an analog output (4-20mA), it can be combined with control and display devices such as PLCs for water quality measurement and management. It supports high water temperatures up to 90°C, making it suitable for use in medical and food processing equipment requiring hot water disinfection. (Pressure resistance requirements apply)