TEMP TX
Temperature measuring transducer
A temperature transducer converts a documented temperature-sensor input into an instrument signal.
SLD / Schematic
Symbols · RH
Relative humidity sensor
In plain English
What does Relative humidity sensor mean?
A relative humidity sensor measures moisture in air relative to the saturation condition at the relevant temperature.
A simple example
A switchroom monitor can report humidity alongside temperature when assessing its environment.
What the drawings help you do
Identify the air location being monitored and show temperature information where the selected interpretation needs it. Relative humidity compares water vapour with saturation at the relevant temperature. This is why the same moisture content can produce a different relative-humidity value as temperature changes.
- Relative humidity
- Moisture in air compared with saturation at the relevant temperature.
- Saturation
- The condition used as the reference for that temperature-dependent comparison.
Before using this reference
- Identify the sensor’s air location and exposure.
- Distinguish humidity and temperature outputs.
- Reference the selected sensor’s mounting and response requirements.
Is relative humidity the same as the mass of water in the air?
No. Relative humidity is a temperature-dependent comparison with saturation. Absolute moisture quantities describe something different, so label the reported quantity and units clearly.
Read the source: Humidity sensing principles
Schematic · RH
A distinction that matters
Relative humidity and absolute water content are different quantities.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Humidity sensing principles
Humidity sensing principles: public technical context for the named function. Product and compliance details remain with the publisher.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
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