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Humidity Sensor Module
SKU: A106 | Weight: 0.2 kg.
149.00
In stock
Humidity is the presence of water (dampness) in the air/ body (say, soil) around. The amount of water vapor in air affects human comfort, working/ efficiency of medicines, injectables, electronic components...as well as a number of manufacturing processes cutting across industries...The presence of water vapor influences various physical, chemical and biological processes.
Humidity measurement in industries is critical because it may affect the business cost of the product, storage & transportation as well as the health and safety of the personnel handling the same. Humidity sensing becomes very important in the control systems too.
Features:
- Relative Humidity sensor
- Two-stage calibration with capacitor-type sensor, excellent performance
- Frequency output type, can be easily integrated with user application systems
- Very low power consumption
- No extra components needed
Applications:
- HVAC
- Automotive
- Consumer Goods
- Weather Stations
- De-humidifiers
- Humidifiers
- Test & Measurement
- Data Logging
- Automation
- White Goods
- Medical
Little bit about the relation between measured capacitance and corresponding 'relative humidity'
- The relation between the measured capacitance and the Relative Humidity(RH) is as given below:
Cc = Cs + S*(Xrh – 55)
with Cc = measured capacitance (pF), Cs = capacitance value at 55% RH (pF), Xrh = measured Relative Humidity (%), S = Sensitivity
- The calculated Relative Humidity is as under: Xrh = (Cc - Cs)/S + 55
- Because of the 'tolerance' applicable on Cs, Calibration is needed to be performed
Calibration:
Due to the high linearity of the humidity sensor it is only needed to be calibrated on one point. A poor man’s solution is to place the humidity sensor in a refrigerator, with the assumption that inside a refrigerator the humidity is always 0%. The factory tests have been done at 55% relative humidity. Depending on the application, the humidity sensor calibration can be done at higher humidity levels as well as at lower levels. The long term stability (0.2%/yr) guarantees stable working for years.
Tolerance:
The specified tolerance is the tolerance of the capacitor at 60% RH. This tolerance can be considered as an effect of the production technology used. Having done so, when the capacitor's capacitance is say 2% too high (@0% RH), the sensitivity too will be around 2% higher..
Linearity:
The linearity is considered as the maximum deviation from a straight-line behaviour in the range - 0% RH and 100% RH. In a highly condensing area some drift can be expected, however, the same is reversible. The sensor is in fact water-resistant.