Field Calibration Procedure - Macurco RD-VRF User Instructions

6.4 Field Calibration Procedure

Note: For optimum calibration results the unit should be in clean air and be in a low ambient air flow
Follow the procedure below for field calibration.
Zero the Sensor
1. Ensure that the sensor is exposed to clean air
2. Leaving the cover on, to enter the calibration menu, position the magnet left of the open slits (vents)
(roughly 4 seconds), in correspondence with the hall effect sensor (see Figure 6-1)
3. The LED will flash alternately green and blue, the buzzer will chirp once every 3 seconds if buzzer is enabled
4. Hold the magnet in place for 2 seconds
5. If successful, the LED will flash green and continue to chirp. If not successful, the LED remains yellow. In this
case, re-zeroing of the sensor was not performed, and the procedure must be repeated
6. To exit the calibration menu, if the user only wants to check the zero calibration, wait 1 minute for it to time
out and resume normal status.
Calibration
1. Assemble the 5,000-ppm gas cylinder and regulator together
2. Check the pressure gauge on the regulator. If you have 25-psi or less, you will need to replace the gas
canister.
3. Leaving the cover on, to enter the calibration menu, position the magnet near the point on the left of the
gas sensor (roughly 4 seconds), in correspondence with the hall effect sensor.
4. To skip zero calibration, leave the magnet in place for another 5 seconds or so.
5. Remove the magnet once the LED flashes alternately red and blue, the buzzer will chirp twice every 3
seconds if buzzer is enabled.
6. Place the RD-VRF Test/Calibration Hood from the regulator over the refrigerant sensor inlet exposing the
sensor to 5,000-ppm and wait 1 to 2 minutes for stabilization of the sensor reading.
7. To set the span value, leave the magnet in this position for 2 seconds.
8. To exit the calibration menu the user can wait 3 minutes or position the magnet for 5 seconds.
If the user leaves the magnet positioned for more than 1 minute, an error is generated
and the LED flashes yellow. To get out of this condition, it is necessary to remove the
magnet and reposition it for 5 seconds.
REV – 1.0
Figure 6-1 Magnet Position
WARNING
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