Manufacturer: HAKARU PLUS CORPORATION
Model: DMH

96 × 48, 4-Digit, Character Height 15mm, Indicator, Input–Alarm–Power Supply Isolation

Model

DMH-(1)-(2)-(3)-(4)

(1) Measurement Range

DC Input

AC Input

(2) Power Supply

(3) Alarm Output

(4) Display Color

How to Order Example

Model: DMH-19-A
Special Specification:

Device Specifications

Exterior

Mounting: Panel-embedded type
Housing: Black plastic
Wiring connection: M3 screw terminal

Display / Input Section

Display contents: Current value, peak memory value, bottom memory value, or fluctuation width.
Numeric range: 0 to 9999, with zero suppression.
Display element: Red LED or green LED, character height 15mm.
Decimal point position: Front setting.
Negative input: “−” display.
Input overrange: Flashes at 130% display. However, when 9999 is exceeded, 0000 flashes.
For measurement range codes 06 and 26, when the input exceeds 699, the full-scale value flashes.

Scaling Function

Full-scale display: -9999 to +9999
Offset display: -999 to +999
For AC input, negative display is not available.

Sampling period: DC input 20 times/second, AC input 1 time/second.
Display period: DC input 50ms, 400ms, 1s, 2s, 4s, or 5s selectable.
Display period: AC input 1s, 2s, 4s, or 5s selectable.
Resolution: 1/1000
Input type: Single-ended
A/D conversion section: Sigma-delta conversion method

Alarm Function

Comparison input switching: Comparison judgment is performed using one of measured data, peak/bottom memory value, or fluctuation width data.
Setting digits: 4 numeric digits and 1 polarity digit.
Setting method: 2-point digital switch setting. Upper limit and lower limit can be set individually.
Hysteresis width setting: 1 to 999, 2-point independent setting.
Alarm display: HI, GO, and LO light up.
Output delay: ON delay, 0 to 60 seconds, 2-point independent setting in 1-second steps.
Comparison condition change: Equal GO judgment or equal NG judgment can be selected.

Standard Functions

Hold: Holds measured data, peak/bottom memory value, fluctuation width, and alarm output.
Reset: Resets the alarm output.
Zero set: Electrically sets the initial input value to zero.
When the 0% value of scaling is not 0, the value at zero setting becomes the 0% value.
Offset fixed: Fixes the 0% input to the 0% display value.
10⁰ digit display fixed: Fixes the 10⁰ digit display value to 0.

Peak / Bottom Memory and Fluctuation Width Function

Reset at power ON, measurement start, and power OFF.
Peak memory: Records the maximum measured value.
Bottom memory: Records the minimum measured value.
Fluctuation width memory: Records the peak value minus the bottom value.

Display selection function: Selects one from the current value, peak/bottom memory value, or fluctuation width.

Average Calculation Function

The display value is interval averaged or moving averaged within the display period.

For moving average, the display period is fixed at 50ms.
The number of averaging data can be selected from 2, 4, 8, 16, or 32.
Cutoff function: Fixes the display to the 0% value of scaling.
Setting range: 0.1 to 19.9% input, for AC input.
Display fine adjustment: Fine adjustment of the display value is possible using the front switches.

Front Panel Function Description

• F: Function switch, switches between measurement mode and setting mode.
• M: Mode switch, switches the display value and setting item.
• >: Shift switch, changes the setting digit and sends the setting value.
• ^: Up switch, selects setting contents and changes the setting value.

Input Specifications

Measurement Input

Alarm Output Specifications

Relay Contact Output

Contact configuration: HI and LO, each 1c contact.
Contact capacity: AC250V 1A, resistive load.

Open Collector

Contact configuration: HI, GO, and LO, NPN output.
Contact capacity: DC30V 30mA, output saturation voltage DC1.6V or less.

Installation Specifications

Power supply:

• AC power supply: AC100 to 240V, 50/60Hz
• Power consumption: Approx. 4.5VA at AC100V, approx. 6VA at AC200V
• DC power supply: DC12 to 24V
• Current consumption: Approx. 150mA at DC12V, approx. 75mA at DC24V

Operating temperature range: 0 to 50°C
Storage temperature: -20 to 70°C
Dimensions: W96 × H48 × D91
Mass: Approx. 250g

Performance

Reference accuracy and temperature coefficient:

Response speed: The longer one between within 2 sampling cycles or within 1 display period.

Noise rejection ratio:

• Normal mode: 50dB or more, for DC input.
• Common mode: 110dB or more, for DC input.
• Power line mixed noise: AC power supply 1000V, DC power supply 500V.

Insulation resistance: DC500V, 100MΩ or more.
Dielectric strength:

• Between input terminal and external case: AC1500V for 1 minute.
• Between power supply terminal and external case: AC1500V for 1 minute.
• Between power supply terminal and input/output terminal: AC1500V for 1 minute.
• For DC power supply: AC1000V for 1 minute.

Connection Diagram

Outline Drawing (Unit: mm)

Mounting Dimensions Drawing (Unit: mm)