NAKATA® THERMO-HYGROMETER
Model: NM-20TH
USER INSTRUCTION
- Temperature sensing element: bi-metal spiral spring
- Humidity sensing element: specially treated hair
- Body: stainless steel SUS304
- Covering face: glass
- Specification
| Model |
Parameter |
Scale |
Measuring Range |
Accuracy |
Scaling |
| NM-20TH |
Temperature |
-20oC ~ +60oC |
-15oC ~ +55oC |
± 1oC |
1oC |
|
Humidity |
0% ~100% |
20%~100% |
±5% |
1% |
2. Usage
- The meter can be either placing on flat surface or hang against the wall.
- The meter should be place at place where air is moving freely
- Avoiding direct sunshine striking the meter
- In case there is so much dirt particle in the environment, the meter should be installed in a net box to prevent dirt covering the sensor.
- No battery or any other powers source are
required.
- The meter can be calibrated by caliberating screw locating in rear of the meter (one for humidity and another for temperature).
- Problems and counter-measurement
| Parameter |
Phenomenon |
Counter-measurement |
| Humidity |
After a long use in environment with stable dry humidity, the sensitivity of the sensor can be effected inertial. |
Covering the meter by wet cloth for few hours until the needle point at right end position. Using screw driver to adjust the needle at 100% position. |
| After a long use in dusty environment, needle can be block. |
Trying to clean the spring & hair by mild air blowing. The placing the meter in net box. |
| Temperature |
After a long use, the eter may face similar causes as the above. |
In order to calibrate, placing a Hg thermometer besides and adjusts temperature needle pointing at the same temperature as with the Hg thermometer reading. |
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