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VG-HUMID - Relative Humidity (RH) Sensors
The VG-HUMID is a low-cost, low power, precision relative humidity (RH)
sensor, for measuring relative humidity of air.
The sensor and electronics are enclosed in a weather resistant flanged
box for easy mounting. The electronic sensor is directly connected to the outside
air through a small inlet tube, on the bottom side of the box near the cable
gland. Because the small inlet tube issolates the sensor from the
rest of the air volume in the box, latency to changes in relative air
humidity is reduced.
The sensor has a simple electrical interface of 3 wires: ground, power
and an analog output voltage which is linear and directly proportional
to the relative humidity ranging from 0 to 3.0V, where 0 represents 0%
humidity and 3.V represents 100% humidity. It can
be powered with a voltage supply from 3.5V to 20V, and consumes less
than 11 mW (3.4mA at 3V).
When ordering this relative humidity (RH) sensors, you can select the
length of the
power cable in standard 2 meter, 5 meter or 10 meter
lengths. The sensing cable comes in the standard lengths of 1
meter and 3 meter lengths. See the ordering table
Relative Humidity Sensor Applications
- Weather and environmental monitoring.
- Green house monitoring.
- Monitoring of terrariums.
- Sensor for Internet of Things.
Relative Humidity Sensor Features
- Low cost.
- Output Voltage is proportional to relative humidity.
- Rugged design for long term use.
- Compact size.
- Very low power operation.
- Precise measurement.
- Wide supply voltage range (3.5 to 20VDC).
- Weather resistant enclosure.
- Compatible with Arduino.
Other Vegetronix Products of Interest
VG-HUMID Relative Humidity Sensor Kit Includes:
controller board, weather resistant box, and power cable.
Relative Humidity Sensor Pricing and Ordering Info
Contact us for volume pricing information.
||Relative Humidity Sensor with 2m Power Cable
||Relative Humidity Sensor with 5m Power Cable
||Relative Humidity Sensor with 10m Power Cable
Relative Humidity Sensor Specifications
|Power consumption (Normal Mode)
||3.5V to 20 VDC.
||See drawing below.
|Power on to Output Stable
||-40C to 85°C
|Accuracy at 25°C
||3% from 20 to 80 RH,
4.5% from 0 to 20 RH, and 80 to 100 RH.
||0 to 3V linear with relative humidity.
|Voltage to RH equation
Relative Humidity Sensor Wiring Table
|Terminal Block 1
||POWER: 3.5V to 20 VDC.
||OUT: (0 to 3V linear with relative humidity.)
Relative Humidity Sensor Drawing
VG-HUMID Relative Humidity Sensor Enclosure Drawing
Frequently Asked Questions - FAQ
- Is the box water proof?
- The enclosure is a water tight box with a gasket on
the parting surface between the box and lid, however, to measure
relative humidity, the sensor needs access to the air which it is
measuring, so it has a small hole in the enclosure next to the cable
gland to allow air to enter into the box. The box should be
mounted with the cable gland facing downward so that rain or other
water can not flow into the box.
- What to I get when I order a VG-HUMID relative humidity sensor?
- It includes: a sensor board, power cable, and weather resistant box.
- How should the enclosure be mounted?
- Mount the cable gland facing downward.
How to Get Started with the Relative Humidity Sensor
The best way to get started is to purchase a few low
cost relative humidity sensors from our webstore and try them out in