Digital Strain Recorder


· Display is provided to enable confirmation of setting conditions and measured values.
· Data can easily be collected in USB memory.
· No control software required. Keys are provided for operation as an independent unit.
· Measurement with thermocouples possible (K, T)
· Compact & lightweight 10-channel model


The RMH-310A is a battery-operated digital strain recorder featuring low power consumption.
Thus, it is suitable for unattended long-term measurement in remote places, mountainous regions and heavy snowfall districts where no power supply is available.

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Digital Strain Recorder


Channels 10
Applicable Transducers Strain-gage civil engineering transducers
Civil engineering transducer with a thermal sensor
Strain-gage transducers
Thermocouples (Types K and T)
Compatible Bridge Resistance 350 Ω (Full-bridge system)
Cable Length Max. 2.0 km
(4-conductor (0.5 mm2) shielded cable)
Gage Factor 2.00 fixed
Bridge Current Approx. 2.19 mA DC (Constant current)
Measuring Range [Strain]
±20000 ×10-6 strain

[Temperature (Civil engineering transducer with a thermal sensor)]
-30.0 to 70.0°C

[Temperature (Thermocouple)]
K: -200 to 1200 °C
T: -200 to 350°C
Resolution [Strain]
1 ×10-6 strain

[Temperature (Civil engineering transducer with a thermal sensor)]

[Temperature (Thermocouple)]
Accuracy [Strain]
±0.1% FS

[Temperature (Civil engineering transducer with a thermal sensor)]

[Temperature (Thermocouple)] (Reference value)
±(0.1% of reading +1.0)°C

[Internal point-of-contact compensator]
Within ±2.0°C
(At the time of an input terminal temperature balance)

The accuracy of an internal reference point-of-contact compensator and accuracy of a thermocouple are not included in measurement accuracy.
Temperature Stability [Strain]
Zero point: Within ±1 ×10-6 strain/°C
Sensitivity: Within ±0.02%/°C

[Temperature (Civil engineering transducer with a thermal sensor)]
Zero point: Within ±0.025%FS/°C
Sensitivity: Within ±0.04%/°C

[Temperature (Thermocouple)]
Zero point: Within ±0.025%FS/°C
Sensitivity: Within ±0.04%/°C
Measuring Time Within 40 s/10 channels (Scanning)
Temperature Measurement Current 0.24 mA DC (Constant current)
Data Storage 32000 times/channel
Clock Year (2 digits of the Gregorian calendar), month, date, hour, and minute
Measuring Interval 1 to 59 minutes (1 minute/step)
1 to 99 hours (1 hour/step)
Check Functions Sensor check (Parallel resistance method and during strain measurement)
Battery voltage
Memory check
Display LCD (20 digits × 4 lines, with no back light)
Display Functions The contents of the data below are displayed on LCD.

Measurement state
Current time
Data acquisition
Real-time monitor
Measurement start
Measurement stop
Condition setting
Date setting
Backup data collection
Version display
Operation Arrow keys
Interface USB 2.0 (Only saved in USB memory)
Power Supply 6 to 15 VDC, optional battery pack
Current Consumption During operation: 100 mA or less
Standby status: 100 μA at 6 VDC
Input Specifications M3 terminals for both solder and screw
Number of Measurement Times 7000 times or more
(When measuring at intervals of 10 minutes at 23ºC using the optional RB-10A battery pack [10 Ah])
Operating Temperature -20 to 50ºC
(Varies depending on the operating temperature range when using USB memory)
Operating Humidity 10 to 95%
Operating Environment Dust or the inductive noise of a bulk motor must not be present.
Dimensions 170 W × 230 H × 60 D mm (Excluding protrusions)
Weight 2 kg or less (Excluding the battery)
Others Lightning surge protector provided (SD4-75)
Standard Accessories Battery cable (For battery pack other than RB-10A)
USB memory for collection data
 (Industrial temperature range extended model)
*Auxiliary tool, instruction manual, specifications, outside drawings are saved in the provided USB memory.
Menu sheet
Optional Accessories Battery pack RB-5A (5Ah)
Battery pack RB-10A (10Ah)


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