Detcon TP-424C - Manual (Page 6)

Ammonia 500 = 0
Diesel Fuel 5000= 0
Demethyl Sulfide 4.4 = 0
Ethylene 200 = 0
Freon 12 1000 = 0
Hydrogen 1000 = 8
Methyl Mercaptan 5 = 8
Sulfur Dioxide 300 = 0
Toluene 32 = 0
Ethanol 500 = 2
3.5 S PECIFICATIONS
Method of Detection
Solid state metal oxide. Diffusion/adsorption
Electrical Classification
Class I; Div 1, Groups B, C, D
Response Time
50% <45 seconds, 80% <90 seconds
Clearing Time
50% <45 seconds, 80% <90 seconds
Repeatability
± 2ppm or ±10% of Reading (Greater Of)
Range of Sensitivity
PPB to % by volume
Operating Temperature
-40° to +175° F
Accuracy
± 2ppm or ±10% of Reading (Greater Of)
Sensor Life
10 year conditional warranty
Field Wiring
3 conductor; max 10 ohms single conductor resistance
Input Power
22.5-28 VDC
Power Consumption
57 mA normal operation (1.37 watts @ 24 VDC); 81 mA max. (2 watts @ 24 VDC)
3.6 I NSTALLATION
NOTE: The Detcon MOS sensor can be damaged to the point of not functioning if the power is turned off in
the presence of high levels of humidity for periods exceeding 8 hours. Always protect the sensor with the
Detcon sealing cap and fresh dessicant packet while the sensr is off power. This will avoid permanent sen-
sor damage and help preserve the span calibration.
Optimum performance of ambient air/gas sensor devices is directly relative to proper application installa-
tion and adherence to recommended maintenance schedules including periodic recalibration.
Field Wiring Table
Detcon Model TP-424C solid state H2S sensor assemblies require three conductor connection between
power supplies and electronic controllers. Wiring designators are + (DC), – (DC) , and mA (sensor signal).
Maximum single conductor resistance between sensor and controller is 10 ohms. Maximum wire size for
termination in the sensor assembly terminal board is 14 gauge.
AWG Meters Feet
20 240 800
18 360 1200
Detcon Model TP-424C Hydrogen Sulfide Sensor PG.6