15
PART 2. SETUP AND CALIBRATION
1.
SETUP
Setup Time and Date.
To change the time and/or date of a Gas-Rover, power the unit
with the left “Power-On” button and when the unit displays the time and date, press the right “Edit”
button once. The first digit of the hour will begin to flash. The right “Update” button will
increment the flashing digit and the left “Next” button will advance it. When Next is pressed at
the last flashing digit, the Edit screen is restored and the power-on sequence resumes with the
edited time and date.
To review or change other setup parameters, power on the Gas-Rover with the left “Power-
On” button and while the unit displays “
Bascom-Turner Gas-Rover
” press the right button once.
A menu of three parameters will be displayed with a pointer to the right of the first parameter:
Alarm Limits
Bar Hole Time
Air Free CO
Power Off
The left “Yes” button selects the parameter indicated by the pointer while the right “No”
button advances the pointer to the next parameter.
Once a parameter is selected the current setting can be saved unchanged by pressing the
left “Save” button or can be changed by pressing the right “Edit” button. If editing is selected, the
Edit screen flashes the parameter or portion of the parameter which can be toggled or incremented
with the right “Update” button. When a (flashing) parameter is OK, press the left “Next” button
to either advance to the next digit or to leave the Edit screen and display the edited parameter.
Alarm Limits.
Alarm level displays which allow limits to be saved or edited are:
%LEL
Alarm Limit: 1 to 20%
Factory Setting: 20%
%GAS
Alarm Limit: 0.1 to 1%
Factory Setting: 1%
SURVEY PPM
Alarm Limit: 5 to 500 ppm
Factory Setting: 10ppm
PPM CO
Alarm Limit: 1 to 200ppm
Factory Setting: 35ppm
The low and high percent oxygen alarm limits (19.5% and 23%) can not be changed.
Bar-Hole Time.
The bar-hole time is the time, in seconds, during which gas is sampled
from a bar-hole. The peak and the average of the last three readings are stored and displayed. The
bar-hole time can be set from 5 to 60 seconds. The factory setting is 15 seconds.
Air-Free CO.
Gas-Rover detectors with both CO and Oxygen sensors may be setup to
display CO on an “air-free” basis. This choice may be appropriate when sampling flue Gas which
may contain varying amounts of “excess” air. When this feature is enabled, the instrument
automatically calculates the concentration of CO in ppm in a gas free of Oxygen and displays it in
the Monitor mode labeled as AFCO. Whenever the amount of Oxygen in the sampled gas exceeds
16%, CO is automatically reported without the excess air correction, i.e. as measured, on the
assumption that the medium is in fact air and not flue gas. This feature is set at the factory at OFF,
i.e. disabled.