1
PART I. OPERATION
1.
THE GAS-ROVER DETECTORS
This manual describes the operation of the family of Gas-Rover detectors for natural gas,
carbon monoxide and oxygen:
Detects natural gas and displays it as PPM, %LEL and % GAS
Detects natural gas and displays it as PPM and % GAS
Detects natural gas and carbon monoxide and displays as PPM, % LEL and
% GAS, and PPM CO
Detects natural gas and carbon monoxide and displays PPM and % GAS
and PPM CO
Detects natural gas and oxygen and displays PPM, % LEL and % GAS, and
% Oxygen
Detects natural gas and oxygen and displays PPM and % GAS and
%Oxygen
Detects natural gas, CO, and oxygen and displays PPM, % LEL and % GAS,
PPM CO and % Oxygen
Detects natural gas, CO, and oxygen and displays PPM and % GAS, PPM
CO and % Oxygen
Detects natural gas, CO, and oxygen and displays PPM and % LEL, PPM
CO, PPM H
2
S and % Oxygen
Detects natural gas, CO, and oxygen and displays PPM and % GAS, PPM
CO, PPM H
2
S and % Oxygen
All models display gas in ppm in the Survey and Truck Survey modes.
All models may be used to test ambient air and bar holes for natural gas and locate gas
leaking from pipes and other conduits. All models which detect carbon monoxide (CO) may be
used to test for CO in ambient air, flue gas, and gases given off by appliances.
A detector alerts the user acoustically and visually, by "flashing" the symbol(s), for
detected gas(es), whose concentration exceeds preset limits. Visual alarms are displayed in-
between readings. For example, the display will flash
"CO",
approximately every two seconds,
in-between normal Monitor mode displays. If the concentration of natural gas also rises above its
alarm limit, the display will flash
“GAS”,
then a normal Monitor mode display, then
"CO"
, and so
on. Simultaneously, the sound alarm will be on.
Visual alarm symbols are “
GAS
” for natural gas,
"CO"
for carbon monoxide.
"Low
Oxygen"
for low oxygen, and
"High Oxygen"
for high oxygen.
Factory set alarm limits are 1.0% methane, 35 ppm CO, and 19.5% for low and
23.0% for high oxygen.
No alarms are given in the Bar Hole, Survey, and Truck Survey modes. However, in the
Survey and Truck Survey modes the acoustic element (buzzer) will sound if gas is detected above
a user selected value (see Part 2, Section 1). The low battery warning is given in all modes.
Model VGI-201
-
Model VGI- 211 -
Model VGC-301 -
Model VGC-311 -
Model VGO-321 -
Model VGO-322 -
Model VGA-411 -
Model VGA-412 -
Model VGA-611 -
Model VGA-612 -
