Detcon FP Transmitter Test Fixture - Manual (Page 8)

Detcon Model FP Transmitter Test Fixture
Page 8 of 8
c) Use the programming magnet to make an adjustment to “PGM 1” to increase or
“PGM 2” to decrease the bridge voltage. Set the voltage to 2.7 VDC. Note that the
LED meter on the test fixture tracks the reading (±0.1V).
d) Exit to the programming menu by holding the programming magnet over
“PGM1” for 3 seconds, or automatically return to the programming menu in 30
seconds.
e) Exit back to normal operation by holding the programming magnet over “PGM
2” for 3 seconds, or automatically return to normal operation in 30 seconds.
4 - 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.
5 - Perform a span 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. Also note that the CAL LED is illuminated and that the mA
Output LED meter on the test fixture indicates 2.0 mA.
b) From the calibration menu “1-ZERO 2-SPAN” proceed into the span adjust
function by holding the programming magnet stationary over “PGM 2” for 3
seconds until the display reads “APPLY 50% LEL” then withdraw the
programming magnet.
c) Turn SW1 to the “50” position. The display will change to “AUTOSPAN 50%”.
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 % LEL”.
6 - Check different ranges. Turn SW1 to each position (10, 20, 50, 100) and verify a
matching transmitter display reading (±2%). The 100 position (see note below) will cause
an over-range condition resulting in the display flashing “100% LEL”. Also verify an
LED mA output reading of 5.6mA (10), 7.2mA (20), 12.0mA (50), and 20.0mA (100).
Return SW1 to the “0” position.