PART 2. SETUP, CALIBRATION AND ALARM LEVEL SELECTION
1.
SETUP PARAMETERS
To change setup parameters, power on the Gas-Explorer and while it displays “
Bascom-
Turner Gas-Explorer
” press the right button once. A menu will be displayed with a pointer:
Alarm Limits
Bar Hole Time
Air Free CO
Power Off
The “Yes” button selects the parameter while the “No” button advances the pointer.
Once a parameter is selected the current setting can be changed by the “Edit” button. If
editing is selected, the screen flashes the parameter which can be incremented with the “Update”
button. Press the “Next” button to either advance or to leave the Edit screen and display the
edited parameter.
Alarm Limits.
Alarm levels which may 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 time can be set from 5 to 60 seconds, factory setting is 15 seconds.
Air-Free CO.
Detectors with both CO and Oxygen sensors may be set to display CO on
an “air-free” basis. This choice displays the concentration of CO in a gas free of Oxygen and is
labeled as AFCO. If Oxygen exceeds 16%, CO is reported without correction.
2.
FURTHER SETUP PARAMETERS
Power on the Gas-Explorer and while the detector displays “
Bascom-Turner Gas-
Explorer
”, press the right and center buttons once. A menu of four choices will be displayed:
Cal Due Time
Pump Current
New Sensor
Power Off
Cal-Due Time.
This may be set from 1 to 30 days; factory setting is 30 days.
Pump Current.
The
“Up” key turns the pump on. The current is should be 50-65 ma.
When the intake is blocked, it should increase to about 220 ma. The Pump Noise test follows
when the “Exit” key is pressed.
The test must be run (with hose, probe, and filter connected) for about 3 minutes to get
meaningful numbers. The noise should be 5.0 or less (pump “Off”) and less than 12 with the
pump “On”
New Sensor.
This screen
must
be run after a new sensor is installed and before the
sensor is first calibrated. When selected, the instrument reverts to a normal start up screen and
proceeds through a mandatory gas calibration screen.
13.
