82 • Appendix A: Maintenance Mode
GasWatch 3 for CO and O
2
•
To change a flashing parameter, press and release AIR. To reverse the direction of change
(ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
•
To exit an entered item without saving a change, press and hold AIR and POWER/MODE
for a few seconds.
Performing a Calibration (GAS CAL)
See pg.43 for a description of the
GAS CAL
item.
Performing a Gas Test (GAS.TEST)
The
GAS.TEST
item allows you to apply gas to the instrument and see all alarm indications
except for the buzzer indication. There is no buzzer indication in the
GAS.TEST
menu even
though the buzzer sounds in the event of a real gas alarm condition while in Measuring Mode.
A gas test is not saved in logged data.
Preparing for a Gas Test
To perform a gas test on the GasWatch 3, you need:
•
A calibration gas cylinder. The concentrations should be above the alarm condition
you want to check. Standard alarm points are listed on pg.7.
•
A 0.25 LPM fixed flow regulator
•
Non-absorbent tubing
•
Calibration cup
1. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM
fixed flow regulator onto the calibration cylinder.
2. Install the calibration cup onto the GasWatch 3. The calibration cup has an indicated flow
direction. Be sure the calibration cup is installed in the correct direction and that it is
pushed on all the way.
3. Use the tubing to connect the regulator to the inlet of the calibration cup.
