Detcon TP-524D-HRT - Manual (Page 10)

Model TP-524D-HRT
TP-524D-HRT Instruction Manual Rev. 0.3 Page 6 of 48
There are some gases typically found in industrial environments that can cause a cross-interference response
on the sensor. See the Table below for some examples.
Table 1 Cross Interference Gases
GAS PPM GAS PPM
Methane 25,000 = 0 Ammonia 500 = 1
Ethane 5,000 = 0 Diesel Fuel 1000 = 0
Hexane 5,000 = 0 Dimethyl Sulfide 4.4 = 0
Propane 5,000 = 0 Ethylene 200 = 0
Butane 5,000 = 0 Freon 12 1,000 = 0
Carbon Monoxide 1% = 0 Hydrogen 5% = 0
Carbon Dioxide 5,000 = 0 Methyl Mercaptan 10 = 0
Carbon Disulfide 14 = 0 Sulfur Dioxide 300 = 0
Methanol 500 = 5 Toluene 32 = 0
Isopropanol 500 = 3 Ethanol 500 = 5
NOTE: The Detcon MOS Sensor Cell can be damaged to the point of non-functioning if the
unit is left off power and in the presence normal air levels of moisture for periods exceeding 8
hours.
NOTE: Always protect the sensor cell with the Detcon Sealing Cap and a fresh desiccant
packet when the sensor is powered off, this will avoid permanent sensor cell damage and help
preserve the span calibration.
2.4 Mounting Installation
The TP-524D-HRT should be vertically oriented so that the sensor points straight downward. The explosion-
proof enclosure or junction box would then typically be mounted on a wall or pole (See Figure 6). Detcon
provides a selection of standard junction boxes in both Aluminum and Stainless Steel.
NOTE: Do not use Teflon Tape or any other type of Pipe Thread material on the ¾” threads
unless the unit is mounted in a severe or harsh environment. Metal-on-metal contact must be
maintained to provide a solid electrical ground path. If Teflon Tape is used the Sensor must be
externally grounded using a ground strap.
When mounting on a pole, secure the Junction Box to a suitable mounting plate and attach the mounting plate
to the pole using U-Bolts. (Pole-Mounting brackets for Detcon Junction Box’s are available separately.)