Detcon DM-600IS - Manual (Page 24)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 20 of 37
Figure 11 Remote Mount wiring
6.0 STARTUP
Upon completion of all mechanical mounting and termination of all field wiring, apply system power and
observe the following normal conditions:
a. DM-6xxIS “Fault” LED is off.
b. A temporary upscale reading will occur as the sensor powers up. This upscale reading will clear to “0”
ppm within approximately 30 minutes of turn-on, assuming there is no gas in the area of the sensor.
NOTE 1: If the display contrast needs adjustment, refer to section 15.0.
NOTE 2: Zero Clearing with Biased Cells
Some electrochemical sensors are biased with an excitation voltage. When power to the sensor
is lost, this bias voltage slowly decays. When power is restored after long periods (multiple
hours) of being unpowered, a surge in sensor output takes place and a long and slow re-
establishing of the sensor’s zero baseline takes place. This re-stabilization time may range from
1 hour to 24 hours depending on the type of sensor and range of operation. The sensor types
that this applies to are the following: HCl, NO, plus all the VOC sensors, C2H30, C2H2,
C3H3N, C4H6, CS2, COS, C2H6S, C3H5OCL, C2H5OH, C2H4, C2H4O, CH2O, CH3OH,
C4H4S, C4H6O2, C6H5CH3 and C2H3CL.