Envco – Environmental Equipment

What is Relative Humidity?
Air moisture content is typically described by a relative humidity measurement. Relative humidity is the ratio of the water vapor content to the concentration of water vapor that the atmosphere could hold. In general, the relative humidity will vary inversely with air temperature so that the relative humidity is highest when the temperature is lowest, and vice versa. Typically after sunrise, when the air warms, the relative humidity falls. Relative humidity is typically given in a percentage reading. The vapor in the air is considered at 100% relative humidity when the concentration of water vapor in air is equal to the water vapor concentration at saturation.

Why Measure Relative Humidity?
Relative humidity has a major effect on the environment. Humidity readings provide a chance to control these effects. Effects include causing discomfort in people or animals, damaging materials in warehouses or other storage facilities, affecting the climates for

The Global Water Solar Shield is a ventilated sun shield, with high reflectiveness, low heat retention, and low thermoconductivity. The unit is designed to protect the Global Water Humidity and Temperature sensors from direct sunlight that may affect the sensor's 4-20 mA output.

Humidity Sensors Specifications

Humidity Sensor
Type: Capacitance
Output: 4-20 mA
Range: 0 to 100% RH
Accuracy: ±2% RH
Operating Voltage: 10-36 VDC
Current Draw: 3mA plus sensor output
Warm Up Time: 3 seconds minimum
Operating Temp: -40° to +55°C
Sensor Size: 1 1/2" diameter x 7"
Weight: 1/2 lb.

Solar Shield
Size: 4" diameter x 8 1/2"
Weight: 1 lb.

Ordering Information
WE600 Humidity Sensor
WE700 Solar Shield
WQEXC Extra Cable Per foot