Detcon TP Transmitter Test Fixture - Manual (Page 6)

Detcon Model TP Transmitter Test Fixture
Page 6 of 9
a) At the transmitter, enter the programming menu by holding the programming
magnet stationary over “PGM 2” for 30 seconds until the display reads “VIEW
PROG STATUS”, then withdraw the magnet.
b) Next, scroll to the “Heater @ #.##vdc” listing and then hold the programming
magnet over “PGM 1” for 3 seconds. The menu item appears as “Adjust @
#.##vdc”.
c) Use the programming magnet to make an adjustment to “PGM 1” to increase or
“PGM 2” to decrease the heater voltage. Set the voltage to 5.25 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 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-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 25 PPM H2S” 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 “25” position. The display will change to “AUTOSPAN 25
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 H2S”.
5 - Check different ranges. Turn SW1 to each position (0, 10, 25, 50, 100) and verify a
matching transmitter display reading (±10%). The 100 position will cause an over-range
condition resulting in the display flashing “100PPM H2S”. 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 heater fault (open heater). Toggle SW2 to the OPEN position and note the
“FLT” LED on the transmitter illuminates and the display reads “Heater Fault”. Also note
that the heater voltage LED display and the mA output LED display indicate a reading of
000. Return SW2 to the NORMAL position.