Detcon DM-200 - Manual (Page 26)

Model DM-200
DM-200 Instruction Manual Rev. 2.0 Page 22 of 40
C2H2, C3H3N, C4H6, CS2, COS, C2H6S, C3H5OCL, C2H5OH, C2H4, C2H4O, CH2O, CH3OH, C4H4S,
C4H6O2, C6H5CH3 and C2H3CL.
The Battery Back-up Module (Optional) has been designed to eliminate re-stabilization down-time by keeping
the ISM completely powered and in a 100% ready state. The Battery Back-up module has a service life of 1.5
years in continuous use.
It is recommended that the "biased" ISM types remain connected to the Battery Back-up Module when not in
use for long periods of time. While transporting a calibrated ISM from the office to the field, it is
recommended to use the Battery Back-up Module to eliminate re-stabilization time. However, for short
durations of 5-10 minutes or less in the un-powered state, it is not necessary to use the Battery Back-up
Module.
NOTE: The Battery Back-up Module can be used to warm-up a "biased" ISM that has been
un-powered. Plugging the ISM into the Battery Back-up Module for 24 hours prior to
calibration is recommended. The ISM plugs into the Battery Back-up Module in the same way
it plugs into the UTM. The gold pin pattern is aligned, pressed together, and the retaining
collar is tightened. Reverse instructions to remove.
Figure 15 ISM Battery Backup Module
4.2 Exchanging Electrochemical Sensors
If an electrochemical sensor exchange is necessary, due to poor sensor performance (See Trouble Shooting
Guide for details). The following procedure should be used.
Remove the ISM from UTM per Section 4.1
Loosen the locking setscrew in splashguard adapter. While firmly holding the center of the ISM main
housing, twist the sensor splashguard adapter counter-clockwise to remove. It may be secured very tight, so
some firm twisting will be required. Once removed the electrochemical sensor is exposed. To remove it, grab
the electrochemical sensor body and pull straight out.
Take your replacement electrochemical sensor and carefully verify that it is identical in gas type and part
number. This information is listed on the label of the electrochemical sensor. You may refer to Table 3 to
verify the correct part number of replacement electrochemical sensors.