Manufacturer : TECHNO MORIOKA
Model: 7731 series

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