Detcon TP-524C - Manual (Page 3)

3.0 D
ESCRIPTION
Detcon MicroSafe™ Model TP-524C, hydrogen sulf ide sensors are non-intrusive “Smart” sensors designed to detect
and monitor H2S in air. Ranges of detection are 0-20 ppm, 0-50 ppm, and 0-100 ppm. One of the primary features
of the sensor is its method of automatic calibration which guides the user through each step via instructions dis-
played on the backlit LCD. The sensor features LED indicators for FAULT and CAL status and is equipped with a
standard analog 4-20 mA output. The microprocessor supervised electronics are packaged as a plug-in module that
mates to a standard connector board. Both are housed in an explosion proof condulet that includes a glass lens. A
16 character alpha/numeric indicator is used to display sensor readings as well as the sensor’s menu driven features
via a hand-held programming magnet.
3.0.1 Sensor Technology
The sensor technology is a patented solid state metal oxide semiconductor. The sensor consists of two thin f ilms; a
temperature sensitive heater f ilm, and an hydrogen sulf ide sensitive sensor f ilm. Both f ilms are deposited on a sili-
con microchip by vacuum deposition. The heater f ilm elevates the operating temperature of the sensor f ilm to a
level where a good sensitivity and response to hydrogen sulf ide is achieved. The sensor f ilm is a proprietary metal
oxide that shows a dynamic response to hydrogen sulf ide gas. Range of sensitivity is from part per billion to % by
volume. The rugged sensor is capable of maintaining its operating characteristics for periods of up to 7-10 years in
most industrial environments and as such, is supported by a 10-year conditional warranty.
Detcon Model TP-524C Hydrogen Sulfide Sensor PG.3
Construction of
Semiconductor Sensor
Sensor
Film
Heater
Film
Silicon
Microchip