Installation; Installation In A Radiation Shield - Decagon Devices VP-3 Operating Manual

Vapor pressure, temperature & relative humidity sensor

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VP-3 User's Manual

6. Installation

Relative humidity is measured at the temperature of the humidity

sensor.

For this to be an accurate representation of the

atmospheric humidity, it is critical that the humidity sensor be at

air temperature. For most outdoor and greenhouse measurement

scenarios, the VP-3 should be housed in a radiation shield with

adequate air flow to allow the sensor to come into equilibrium

with air temperature. In general, the higher the wind speed, the

accurate

the

temperature

and

relative

humidity

measurements will be. A radiation shield is not critical for non-

greenhouse, indoor monitoring applications where radiation

loading is small.

Decagon's radiation shield comes with a mounting bracket and

seven discs that prevent direct sunlight from coming into coming

contact with the sensor. This isolation from solar radiation

prevents false readings of elevated temperatures, allowing for

accurate measurement of ambient air temperature. To install the

sensor in the radiation shield follow the directions below:

1. Gently pry the white cap from the bottom center hole of the

radiation shield.

2. Slide the white cap onto the cable of the sensor.

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