HS-04 Operator’s Manual Appendix A: Maintenance Mode • 85
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”.
3. Turn the regulator knob counterclockwise to open the regulator.
4. The instrument initiates alarm indicators except
for the buzzer. There is no buzzer indicator in
the GAS.TEST menu even though the buzzer sounds in the event of a real gas alarm
condition.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the calibration cylinder.
7. Remove the calibration cup from the HS-04.
8. Store the calibration kit in a safe and convenient place.
9. Press and release POWER MODE to return to the GAS.TEST item in Maintenance Mode.
10. See “Entering Measuring Mode (START)” on page 92 to enter Measuring Mode.
Sensor/Battery Replacement Date (SEN.DATE)
The SEN.DATE item allows you to keep track of when the sensor and the batteries were replaced.
1. While in Maintenance Mode, press AIR to scroll to SEN.DATE.
2. Press and release POWER MODE. The sensor replacement date displays.
H2S
0.0
GAS .TEST
ppm
H2S
0.0
BUZZ .OFF
ppm
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