Detcon CXT-DM, Operator'S Installation And Instruction Manual, Page: 15 / 58

Model CXT-DM
CXT-DM Instruction Manual Rev. 2.0 Page 11 of 54
2.3 Sensor Contaminants and Interference
Electrochemical toxic gas may be adversely affected by exposure to other airborne gases. Depending on the
cross-sensitivity relationship, there may be a positive or negative impact on the reading.
The most commonly present gases that potentially cause interference problems are listed in Table 4
Interfering
Gases and Table 5 Cross Interference Table (Refer to section 9.3 Interference Table).
The presence of cross-interference gases in an area does not preclude the use of this sensor technology,
although it is possible that the sensor could experience a false high or false low reading should exposure occur.
Cross-Interference Data Table
Table 5 Cross Interference Table (refer to Section 9.3 Interference Table) lists the gases typically found in
industrial environments that may cause a cross-interference response on members of the Detcon family of
toxic gas sensors. Review Table 5 in Section 9.3 for the correct gas and then scan across the list for possible
interference gases. Determine the magnitude of cross-interference that may occur.
2.4 Sensor Mounting
The CXT-DM should be vertically oriented so that the sensor points straight downward. The explosion-proof
enclosure or junction box is typically mounted on a wall or pole (See Figure 12). Detcon provides a selection
of standard junction boxes in both Aluminum and Stainless Steel.
NOTE: If wall mounting without a mounting plate, make sure to use at least 0.5” spacers
underneath the Detcon Aluminum Junction-Box’s 1/4” mounting holes to move the sensor
assembly away from the wall and allow access clearance to the sensor assembly.
NOTE: Do not use Teflon Tape or any other type of Pipe Thread material on the ¾” threads
unless the sensor 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 Boxes are available separately.)