Va201T/Va201M Calibration Procedure - Honeywell VA201T Calibration Handbook

Calibration Handbook

VA201T/VA201M Calibration Procedure

IF YOUR TRANSMITTER WAS PURCHASED BEFORE APRIL 1, 2004, CONTACT TECHNICAL SUPPORT
LINE AT 1-800-563-2967
1. Warm-Up Period
Turn the unit on for a minimum of five (5) minutes when battery back-up sensor board is included.
Check Calibration Information table for specific warm-up time.
2. Connecting the Hardware
Plug the voltmeter probes in the unit and adjust it to read VDC.
Plug the calibration adaptor into the gas sensor inlet.
Always plug the calibration adaptor to have the holes in a vertical position.
Always connect the tubing in the lower hole.
Screw the regulator to the calibration span gas cylinder.
Connect the regulator outlet to the calibration adaptor with the 1/8 I.D. polymer tubing.
3. Adjusting the Zero (if required)
If you suspect the presence of the target gas, inject zero gas at the specified flow rate for a minimum
of 1 minute prior to adjusting the potentiometer.
Adjust the zero potentiometer to read -35 mV.
This must be achieved in a well ventilated area where there is no presence of the target gas.
CAUTION :
For all Q2 except CO detectors bought after April 25, 2005, do the following steps:
Adjust the zero potentiometer to read 10 mV.
Very slowly, adjust the zero potentiometer to read 0 mV. Be careful do not go under 0 mV because the negative
voltage won't be displayed.
4. Adjusting the Span
Turn on the regulator and inject span gas at the specified flow rate.
The span gas is now flowing into the unit.
After 2.5 minutes, the voltmeter readings should be stabilized.
10 VA201T / VA201M