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VG-HUMID - Relative Humidity (RH) Sensors

Relative Humidity (RH) Sensor
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 below.

Relative Humidity SensorApplications

  • Weather and environmental monitoring.
  • Green house monitoring.
  • Aquaponics.
  • 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



Relative Humidity Sensor
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.

ORDER INFO
VG-HUMID
Part Number Description Price Purchase
VG-HUMID-2M Relative Humidity Sensor with 2m Power Cable $37.95 Buy Relative Humidity Sensor with 2m Power Cable
VG-HUMID-5M Relative Humidity Sensor with 5m Power Cable $43.95 Buy Relative Humidity Sensor with 5m Power Cable
VG-HUMID-10M Relative Humidity Sensor with 10m Power Cable $53.95 Buy Relative Humidity Sensor with 10m Power Cable

Relative Humidity Sensor Specifications

VG-HUMID
Power consumption (Normal Mode) 10.2 mW
Supply Voltage 3.5V to 20 VDC.
Dimensions See drawing below.
Power on to Output Stable 500 ms
Output Impedance 10K ohms
Operational Temperature -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.
Resolution 0.1% RH
Output Range 0 to 3V linear with relative humidity.
Voltage to RH equation RH(%)= V*33.33

Relative Humidity Sensor Wiring Table

Terminal Block 1 Wire Color Description
Pin 1 Red POWER: 3.5V to 20 VDC.
Pin 2 Black OUT: (0 to 3V linear with relative humidity.)
Pin 3 Bare Ground

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 your application.

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