84 • Appendix A: Maintenance Mode HS-04 Operator’s Manual
• 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 page 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 indicators
except for the buzzer indicator. There is no buzzer indicator 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 HS-04, you need:
• Calibration gas cylinder (RKI Instruments recommends using 25 ppm H
2
S, but any value
between 1.0 ppm and 200.0 ppm can be used)
The concentrations should be above the alarm condition you want to check. Standard
alarm points are listed on page 8.
• 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 HS-04. 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 (labeled “IN”).
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