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96
9.3
CO2 Sensor
To calibrate the CO2 level, obtain a suitable test kit and use the procedures described in the kit. Ensure
that the house is well ventilated, either naturally or using fans.
CAUTION
Only calibrate the sensors if you have reason to believe that they are producing
inaccurate results.
•
Ppm at 4 mA / 1 VDC: Parts per million for 4 mA or 1 VDC
•
Ppm at 20 mA / 5 VDC: Parts per million for 20 mA or 5 VDC
•
Factor (ppm): (-/+) ppm shift from the current reading
•
CO2 (ppm): Current CO2 readings
•
Adjust the Farm Premium reading as needed using the left/right arrow keys.
•
Refer to CO2 Treatment, page 25.
9.4
Static Pressure Calibration
The Static Pressure should be 0 when there is no ventilation and the house is closed. When the controller
A/D counts is 100, this means that there is zero (0) static pressure.
CAUTION:
The Static Pressure sensor is factory calibrated. Only calibrate the sensor if you have
reason to believe that they are producing inaccurate results.
NOTE:
Run Farm Premium for a few hours so that the temperature in the box becomes stable and only
then calibrate.
CAUTION
DO NOT blow the air into the hose to see of the pressure changes! The sensor is
sensitive and blowing air can cause irreparable damage.
To calibrate the Static Pressure Sensor:
1. Disconnect the air hoses.
2. Go to
Service > Static Pressure Cal
.
3. If the A/D count is 100 +/- 30 (70 to 130), press Enter.
4. If the A/D count is less than 70 or greater than 130:
a. Check for blocked air hoses or wind interference.
b. Adjust the zero pressure reading to approximately 100 by turning the calibration screw.
c. When the A/D count is within the permitted range, press Enter.
CO2 SENSOR CALIBRATION
Value
PPM at 4 mA/1 VDC
26
PPM at 20 mA/5 VDC
3000
Factor (PPM)
22
CO2 (ppm):
482