Some of the radiation coming into a sensor at low angles is reflected, which causes the reading to be less than it should be. To partly correct for this problem, sensors are often enclosed in a black cylinder with a small raised translucent disk in the top. This cosine corrected head helps to capture radiation at low angles. The Apogee sensor is cosine corrected by surrounding it with a dense foam gasket that blocks the radiation at very low angles. A small gap between the edge of the sensor and the gasket allows the correct amount of low angle radiation to be captured by the sensor. The cosine error for typical applications is less than 1%. |
LONG-TERM STABILITY |
The output of all radiation sensors tends to decrease over time as the detector ages. Our experience indicates that the average decrease of the sensor in this meter is about 1% to 2 % per year. We recommend returning the meter for recalibration every 3 years.CALIBRATION The meter includes a potentiometer that can be used to change the calibration. Please contact AgriHouse if you would like the meter recalibrated. Do not attempt recalibration without a radiation standard. |
TEST RESULTS |
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