Detcon DM Transmitter Test Fixture - Manual (Page 5)

Detcon Model DM Transmitter Test Fixture
Page 5 of 8
1 - Turn the power switch on. The mA LED meter should illuminate.
2 - Plug the DM-5xx transmitter into P1.
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-5xx 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
case, when performing a span cal, you will set SW1 to 50% of scale regardless of what
ppm range is requested by the transmitter during the calibration procedure.
a) Enter the calibration menu by holding the programming magnet stationary over
“PGM 1” for 3 seconds until the display reads “1-ZERO 2-EXIT”, then withdraw
the magnet.
b) From the calibration menu “1-ZERO 2-EXIT” proceed into the span adjust
function by holding the programming magnet stationary over “PGM 1” for 3
seconds until the display reads “APPLY ## PPM” then withdraw the programming
magnet. Note that the CAL LED is illuminated and that the mA Output LED meter
on the test fixture indicates 2.0 mA.
c) Turn SW1 to the “50%” position. The display will change to “AUTOSPAN ##
PPM”. When the sensor signal is stable it will auto span to the requested
concentration and the display will change to “SPAN COMPLETE” for two
seconds and then “REMOVE GAS”. Turn SW1 back to the “0” position. The
display will return to the normal operation menu, “0 PPM ###”.
5 - Check different ranges. Turn SW1 to each position (0, 10, 25, 50, 100) and verify a
matching transmitter display reading (±10%). These position settings are the % of the full