RMH-310A
Digital Strain Recorder

Summary
· 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
Features
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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RMH-310A
Digital Strain Recorder

Specifications
Channels | 10 |
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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)] 0.1°C [Temperature (Thermocouple)] 0.1°C |
Accuracy | [Strain] ±0.1% FS [Temperature (Civil engineering transducer with a thermal sensor)] ±0.5°C [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) Note: 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 Self-check Date setting Backup data collection Version display |
Operation | Arrow keys ON/OFF SET ESC |
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 |
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Optional Accessories | Battery pack RB-5A (5Ah) Battery pack RB-10A (10Ah) |
Dimensions
