Detcon FP Transmitter Test Fixture - Manual (Page 7)

Detcon Model FP Transmitter Test Fixture
Page 7 of 7
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.
NOTE: Optimally, when SW1 is in the 100% LEL position, the FP-524 display will
indicate a flashing 100 and the mA Output display on the tester will read 20.0. However,
a signal clipping zener diode on the transmitter may begin to activate in the high end of
the range prematurely on some transmitters causing a lower reading. The size of the error
may vary between transmitters. A reading as low as 80% is possible. From a safety
standpoint, the premature clipping occurs far above industry alarm set points.
7 - Check signal fault (open reference). Toggle SW2 to the OPEN position and note the
“FLT” LED on the transmitter illuminates and the display reads “Sensor Fault”. The mA
output LED will also indicate “00.0”. Return SW2 to the NORMAL position.
8 - Check signal fault (open active). Toggle SW3 to the OPEN position and note the
“FLT” LED on the transmitter illuminates and the display reads “Sensor Fault”. The mA
output LED will also indicate “00.0” Return SW3 to the NORMAL position.
4.3 FP-550x and FP-624x Transmitters
Require tools:
Detcon PN 327-000000-000 MicroSafe™ Programming Magnet
NOTE: These instructions cover testing of the main features of the FP-550x and FP-624x
transmitters. See the applicable FP-550x and FP-624x 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 FP-550x/FP-624x transmitter into P2.
3 - Set the bridge voltage.
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 “SET BRIDGE VOLTS” listing and then hold the
programming magnet over “PGM 1” for 3 seconds. The menu item appears as
“BRIDGE @ #.## VDC”.