22 • Chapter 3: Measuring Mode HS-04 Operator’s Manual
Measuring Mode Operation
When the HS-04 completes its startup sequence, it is in Measuring Mode. In Measuring Mode the
HS-04 continuously monitors the sampled atmosphere and displays the gas concentration. The
HS-04 is in Normal Operation if there are no alarm indicators.
Heart Symbol: The heart symbol in the top right corner of the LCD indicates the operation status
and flashes when normal. A microprocessor error causes the heart symbol to stop flashing or to
disappear.
Check Mark: If BP.RMDR is set to ON and if a bump test is not due, a check mark appears in the
lower left corner of the LCD.
“S”: If the instrument is operating in Stealth Mode, an “S.” appears at the bottom of the LCD.
Backlight: In a low-light environment, press and release either button to turn on the display
backlight. See page 65 to program backlight duration.
Confirmation/Non-Compliance Indicator: If the BEEP item in User Mode is set to anything other
than OFF, the HS-04 gives periodic indicators to confirm that it’s operating or to indicate a non-
compliance (see page 63).
Monitoring an Area
1. Start up the HS-04 as described above in “Start Up” on page 16. It is now in Measuring Mode.
2. The instrument displays the H
2
S reading.
3. Take the HS-04 to the monitoring area.
4. Wait at least 15 seconds.
5. If a reading is observed, allow the reading to stabilize to determine the gas concentration
present.
6. If a gas alarm occurs, take appropriate action. See page 25.
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