16
PART 2. SETUP, CALIBRATION AND ALARM LEVEL SELECTION
1.
SETUP PARAMETERS
To change setup parameters, power on the Gas-Explorer and while the unit displays
“
Bascom-Turner Gas-Explorer II
” press the right button once. A menu will be displayed with a
pointer:
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%
PPM CO
Alarm Limit: 1 to 200ppm
Factory Setting: 35ppm
PPM H
2
S
Alarm Limit: 1 to 10ppm
Factory Setting: 9ppm
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 bar-hole time can be set from 5 to 60 seconds. The factory setting is 15
seconds.
Air-Free CO.
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 to OFF, i.e. disabled.
Summary of Contents for GAS-EXPLORER II EGI-201
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