Bascom_turner OM-1108 - Part 1. Operation; 1. The Gas-Ranger Detectors

1
PART 1. OPERATION
1. THE GAS-RANGER DETECTORS
This manual describes the operation of the family of Gas-Ranger detectors for natural gas,
carbon monoxide and oxygen:
Model RGI -201 - Detects natural gas and displays it as % LEL or % GAS
Model RGI -211 - Detects natural gas and displays it as % GAS
Model RGC-301 - Detects natural gas and carbon monoxide and displays % LEL or
% GAS and PPM CO (parts per million of CO)
Model RGC-311 - Detects natural gas and carbon monoxide and displays % GAS and
PPM CO (parts per million of CO)
Model RGO-321 - Detects natural gas and oxygen and displays % LEL or % GAS and
% Oxygen.
Model RGA-411 - Detects natural gas, CO, and oxygen and displays % GAS, PPM
CO and % Oxygen with TRACK GAS in % LEL
Model RGA-412 - Detects natural gas, CO, and oxygen and displays % GAS, PPM
CO and % Oxygen with TRACK GAS in % GAS.
Model RGA-611 - Detects natural gas, CO, oxygen and H
2
S and displays % GAS,
PPM CO, % Oxygen and PPM H
2
S with TRACK GAS in % LEL
Model RGA-612 - Detects natural gas, CO, oxygen and H
2
S and displays % GAS,
PPM CO, % Oxygen and PPM H
2
S with TRACK GAS in % GAS.
All models detect natural gas and may be used to test ambient air for natural gas, bar hole,
and track gas leaks in pipes and other conduits.
All models which detect carbon monoxide (CO) may be used to test for CO in ambient air
and test for CO in flue gas and gases given off by appliances.
All models have a TRACK GAS scale which operates as follows:
TRACK GAS - Displays the concentration of natural gas in % LEL (Models RGI-
201, RGC-301, RGA-411 and RGA-611) or % GAS (Models RGI-
211, RGC-311, RGA-412 and RGA-612) and operates a beeper for
tracking the source of a leak
All gases detected by a particular instrument are monitored continuously while
using any choice of display, including TRACK GAS.
A unit alerts the user visually and audibly (with an alarm) when the concentration of one
or more gases exceeds preset limits. Alarm limits can be set by the user. Factory set limits are:
% GAS = 1.0% equivalent to % LEL = 20%
PPM CO = 200 ppm
% OXYGEN = 19.5% for low and 23.0% for high
PPM H
2
S = 10 ppm
In the "TRACK GAS" mode, the frequency of a beeper depends on the natural gas
concentration. The beeper is silent below 0.2% LEL (0.04% GAS) and sounds once every 2
seconds at 0.2% LEL of gas, speeds up with rising concentration and is on continuously at 2%
LEL (0.1% gas) above ambient.