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78 • Appendix A: Maintenance Mode
SC-04
Performing a Calibration (GAS CAL)
See pg.41 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 SC-04, 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. Install the calibration cup onto the SC-04. Be sure the calibration cup is installed in the
correct direction and that it is pushed on all the way.
2. Use the tubing to connect the regulator to the inlet of the calibration cup (labeled “IN”).
Performing a Gas Test
1. While in Maintenance Mode, press AIR to scroll to
GAS.TEST
.
2. Press and release POWER MODE. The current gas reading displays. The bottom of the
LCD alternates between “GAS.TEST” and “BUZZ.OFF”.
POW ER
MODE
AIR
Front View
Side View
GAS .TEST
SO2
0.00
GAS .TEST
ppm
SO2
0.00
BUZZ .OFF
ppm