Heath Consultants Optical Methane Detector (OM) - Manual (Page 20)

20
O
PERATING
P
ROCEDURES
6) Set the SPEAKER VOLUME of the alarm to the desired level
by pressing either the SPEAKER VOLUME INCREMENT
or DECREMENT button to raise or lower the SPEAKER
VOLUME. Holding either the up or down SPEAKER VOL-
UME button will enable the auto scroll feature. If needed,
press the CALIBRATION TEST button to introduce a gas
alarm.
7) Adjust the CONTRAST to the desired level by pressing either
the CONTRAST UP or DOWN button to raise or lower the
CONTRAST control to maximize the visibility of the display.
Holding either the up or down CONTRAST button will enable
the auto scroll feature.
DISPLAY FUNCTION:
The DISPLAY FUNCTION has three modes- HOLD, LIGHT &
SAMPLE. These modes are entered by consecutively pressing
the DISPLAY FUNCTION button to scroll through each. Begin-
ning with HOLD, as you continue to press the button the mode
changes from HOLD to LIGHT to SAMPLE and back to HOLD
again, as indicated by the direction of the arrow.
HOLD:
This is the power up default position indicated by the line under
the word HOLD. This position will stop the updating of the
methane level vs. time. This allows the operator to inspect the
display before it scrolls off the screen. This is especially impor-
tant in one-person survey operations as the driver may hold the
display while finding a place to pull off the road. A message
prompting the operator to “PUSH DISPLAY FUNCTION TO
CONTINUE”, will be displayed. The display will be cleared
when the DISPLAY FUNCTION button is pressed again, leaving