4
3.
OPERATIONAL DESCRIPTION
To conserve the batteries, turn the instrument OFF when not in use.
The instrument is controlled by three push button switches whose function changes with
each particular display (see Appendix 1). The function of each push button is shown on the display
in each case. In general, the middle button silences the beeper (“mutes” the instrument).
Startup Sequence.
To turn the instrument on, press the left switch. A series of screens is
automatically displayed preparatory to entering the first operational mode, viz. “
Survey
”. Along
the way, a number of specialized screens can be used to access specialized functions.
The first screen shows the Model Number and the second displays gases detected by the
instrument and provides access to the USB interface (see Part 3) or to a display of the serial
number. The next screen shows the date and time. To edit the date or time, press the right “Edit”
button. The first digit of the hour will begin flashing and can be changed from 0 to 1 or 1 to 0 by
pressing the right “Update” button. Pressing the “Next” button advances the flashing digit which
can then be edited (or not) by pressing the right (or left) button, and so on. The same screen
provides access to a short manual by pressing the left “Help” button.
Following the Edit/Help screen, the pump is tested (“Block Pump” screen). If no block is
detected in 40 seconds, “
Check Probe
” is displayed, followed by “
Remove Probe and Block
Intake
” and finally “
Repair Pump
” followed by an automatic turning off of power.
The next display suggests a “
Calibrate by
[a date thirty days from the date of the last
calibration]” and an opportunity to calibrate (see Part 2, Calibration). If calibration is not chosen,
the instrument proceeds to enter the operational mode of “Survey” (see below).
The period of thirty days between calibrations is only a default value. The instrument
should be calibrated as often as possible, ideally every day. In any case, if poisoning of the natural
gas sensor or some other problem is suspected, the instrument should be promptly checked by
calibration with CAL Gas (see Part 2, Calibration).
Backlight.
Pressing any button backlights the display for 20 seconds. To backlight any
display, press the middle button twice (double click). The backlight remains on until a new display
is entered or the middle button is double-clicked again. An exception to this procedure is during
bar holing (middle button initiates sampling). Pressing the middle “Go” button automatically
backlights the display long enough (60 seconds) to read the results.
Turning the Instrument Off.
The instrument can be turned off from a number (but not
all) displays. Such places are obvious when a particular button is marked “Off.” In all such cases
the screen accessed by pressing “Off” requires a second operation (“Yes”) to actually turn the
instrument off. This sequence guards against accidental turning off.
When a direct “Off” button is not available, you may follow the procedures suggested below:
1.
At the USB access display, press the left “USB” button and then after the new
screen, the right “Off” button.
2.
During warm-up of the Survey mode, press the left “BH” button, then “Go”, and
then “Stop” (as soon as it appears) and then “Off.”
