Detcon DM-100 - Manual (Page 18)

Model DM-100
DM-100 Instruction Manual Rev. 3.3 Page 14 of 40
3. Operation
The Operator Interface of the Model 100 Series gas sensors is accomplished via two internal magnetic
switches located on the left and the right of the sensor (Figure 14). The two switches, labeled PGM1 and
PGM2, allow for complete calibration of the sensor. The addition of the Loop Powered Display allows the
ability to calibrate the sensor without the need to de-classify the area or the use of hot permits.
Figure 13 Magnetic Programming Tool
The magnetic programming tool (Figure 13) is used to operate the magnetic switches. Switch action is defined
as momentary contact and 3-second hold. Hold time is defined as the time from the point when the magnet is
placed in close proximity with the switch. For momentary contact the programming magnet is briefly held
over a switch location. The location of PGM1 and PGM2 are shown in Figure 14.
DETCON, INC.
H2S
100 PPM
DM-100
Program 1 Program 2
Figure 14 Magnetic Programming Switches
3.1 Normal Operation
In normal operation, the mA output will be the current sensor reading. In normal operation, the 4-20mA
current output linearity corresponds with the full-scale range. If the DM-100 Display option is added to the
sensor, the display continuously shows the current sensor reading in ppm or % by volume, which will
normally appear as "0". If the sensor is actively experiencing any diagnostic faults, the mA output will be
taken to 1.2mA to designate a fault to the controller. The DM-100 Display will display an error code to signify
a fault. Error codes are noted by Fxx, where F is Fault and xx is an error code. Error codes are defined in
Section 5, Troubleshooting Guide .
3.2 Auto Span Level Adjustment
This procedure can only be achieved if the unit has a display.
1. In normal operation, hold the programming magnet over PGM2 for a minimum of 3 seconds to set the
Auto span level.