Model DM-100
DM-100 Instruction Manual
Rev. 3.5
Page 8 of 41
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 ensure 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 (Section 8.3, Interference Table).
The presence of cross-interference gases in an area does not preclude the use of this sensor technology. The
sensor could experience a false high or false low reading should exposure occur.
Cross-Interference Data Table
The gases typically found in industrial environments that may cause a cross-interference response on Detcon
toxic gas sensors are listed in Table 5 (Section 8.3, Interference Table). Review Table 5 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 DM-100 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 (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 J-Box’s
1
/
4
" mounting holes to move the wireless 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
3
/
4
" 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.
