Detcon DM Transmitter Test Fixture - Manual (Page 6)

Detcon Model DM Transmitter Test Fixture
Page 6 of 8
scale range of the transmitter so calculate the proper reading accordingly. For example, If
the range of the transmitter is 0-100 ppm, the reading will equal the number indicated by
the SW1 position. If the range of the transmitter is 0-50 PPM, the reading will equal half
of the number indicated by the SW1 position, and so on. The 100 position will cause an
over-range condition resulting in the display flashing “### PPM ###”. Also verify an
LED mA output reading of 4.0 mA (0), 5.6mA (10), 8.0mA (25), 12.0mA (50), and
20.0mA (100). Return SW1 to the “0” position.
6 - Check zero fault. Turn SW1 to the zero fault position and note the “FLT” LED on the
transmitter illuminates and the display reads “Zero Fault”. Also note that the mA output
LED display indicates a reading of 000. Return SW2 to the NORMAL position.
4.2 DM-550 and DM-6xx Transmitters
Require tools:
Detcon PN 327-000000-000 MicroSafe™ Programming Magnet
NOTE: These instructions cover testing of the main features of the DM-550 and DM-6xx
transmitters. See the applicable DM-550 and DM-6xx instruction manual for a complete
list of program features and detailed operating procedures.
1 - Turn the power switch on. Both digital LED meters should illuminate.
2 - Plug the DM-550/DM-6xx transmitter into P2.
3 - Perform a zero cal.
a) Enter the calibration menu by holding the programming magnet stationary over
“PGM 1” for 3 seconds until the display reads “1-ZERO 2-SPAN”, then
withdraw the magnet. Note that the “CAL” LED is on. Also note that the CAL
LED is illuminated and that the mA Output LED meter on the test fixture indicates
2.0 mA.
b) Next, enter the zero menu by holding the magnet stationary over “PGM 1” for 3
seconds until the display reads: “ZERO 0%”, then withdraw the magnet. The
sensor has now entered the auto zero mode. When it is complete the display will
read “ZERO COMPLETE” for 5 seconds and then return to the normal operations
menu, “0 % LEL”. Note that the mA Output LED meter on the test fixture
indicates 4.0 mA.
4 - Perform a span cal.
NOTE: DM series transmitters are universal and are programmed to operate at a specific
range as well as calibration level (see the DM-550/DM-6xx instruction manual for further
information). To do a proper span cal, you must know the range and calibration level of
your transmitter. In most instances the calibration level is set to half of the range. In this