Description
The sensor used in the RHT Climate Transmitter is a device that is sensitive to electrostatic discharge (ESD). Whenever the sensor is touched, measures need to be taken to prevent ESD damage.
The sensor may be damaged or lose its calibration if exposed to atmospheres contaminated with chemical agents. Hydrochloric Acid, Nitric Acid, Sulfuric Acid and Ammonia at high concentrations can damage the sensor. Acetone, Ethanol and Propylene Glycol can cause reversible measurement errors.
The humidity sensor’s calibration can be altered if it is exposed to contaminating vapours or extreme humidity and temperature conditions for
prolonged periods. To speed up calibration restore, proceed as described below:
- Remove sensor from capsule
- If there are solid particles on the sensor, wash it with water
- Place the sensor in an oven at 80 °C (+/-10 °C) for 24 hours
- Place the sensor for 48 hours in a location with temperature between 20 and 30 °C humidity higher than 75% RH
- Place the sensor in the capsule again.
Sensor Replacement
In case of damage, the humidity and temperature sensor may need to be replaced. To perform this procedure, follow the steps below:
- Unplug the transmitter from the power supply and remove the USB cable, if connected. Find the protective sensor tip. In this example, we are showing how a sensor is replaced in a RHT Climate Transmitter, where the sensor is located at the end of the rod.
- Remove the tip by turning it counter-clockwise.
- Without the tip the sensor will be exposed. Remove it by pulling it forward to disconnect it.
- Connect the new sensor at the rod tip connector. For this step, measures to prevent electrostatic discharge should be taken.
- Place the protection tip again and turn it clockwise to secure it to the transmitter.