Detcon CXT-DM - Manual (Page 13)

Model CXT-DM
Although the sensor is designed to be RFI resistant, it should not be mounted in close proximity to high-
powered radio transmitters or similar RFI generating equipment.
When possible mount in an area void of high wind, accumulating dust, rain, or splashing from hose spray,
direct steam releases, and continuous vibration. If the sensor cannot be mounted away from these conditions
then make sure the Detcon Harsh Location Dust Guard accessory is used.
Do not mount in locations where temperatures will exceed the operating temperature limits of the sensor.
Where direct sunlight leads to exceeding the high temperature-operating limit, use a sunshade to help reduce
temperature.
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 11). 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.)
CXT-DM Instruction Manual Rev. 1.6 Page 9 of 52