Section I
General Information
DESCRIPTION
The R8471B Hydrogen Sulfide (H
2
S) Controller is a
single channel, rack mounted device that operates
in the ranges of 0 to 100, 0 to 50 or 0 to 20 parts per
million (ppm). The controller provides continuous
monitoring of a Det-Tronics electrochemical H
2
S
sensor or any H
2
S sensor/transmitter assembly
capable of generating a 4 to 20 ma dc signal.
Controller response includes actuation of solid state
or optional relay outputs for direct control of field
response devices, a full array of faceplate indicators,
as well as an optional 4 to 20 milliampere output for
transmitting system information to other devices.
FEATURES
•
Controller accepts a 4 to 20 ma input, ensuring
compatibility with a Det-Tronics electrochemical H
2
S
sensor or a variety of H
2
S sensor/transmitter assem-
blies.
•
Digital display, bar graph display, and high intensity
LEDs indicate important system status information.
•
AutoCal feature provides easy and accurate calibra-
tion.
•
Microprocessor based controller is easily field pro-
grammable.
•
Base model is furnished with solid state alarm and
fault outputs.
•
Premium model is furnished with relay outputs and a
4 to 20 ma dc output.
•
Current output is selectable for isolated/non-isolated
operation.
•
Rack compatible with Det-Tronics R7400 series
flame controllers.
•
Variety of racks available in 4U or 3U height configu-
ration.
APPLICATION INFORMATION
Hydrogen sulfide is a colorless, highly toxic gas. It
is frequently found in oil and natural gas, sewage
disposal or treatment systems, as well as a variety
of industrial processes. Typical operations that
encounter H
2
S include:
• Oil and natural gas exploration and production
• Refineries
• Sewers
• Sewage treatment plants
• Chemical plants
• Paper mills.
The ability to electronically monitor the level of H
2
S is
essential in many potentially hazardous environments.
In low concentrations hydrogen sulfide has the odor
of rotten eggs. However, at higher concentrations
or after prolonged exposure, it deadens the sense
of smell. Therefore, depending on human senses
alone to estimate the concentration of H
2
S is totally
unreliable.
2.1
©
Detector Electronics Corporation 2007 8/07
95-8401
INSTRUCTIONS
H2S Controller
R8471B
