Detcon FP Transmitter Test Fixture - Manual (Page 9)

Detcon Model FP Transmitter Test Fixture
Page 9 of 9
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 and the “FLT” LED on the test fixture 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,
ALM1, and ALM2 LEDs on the transmitter illuminate and the display reads “Sensor
Fault”. Note also the FLT, ALM1 and AM2 LEDs on the test fixture illuminate. The mA
output LED will also indicate “00.0”. Return SW3 to the NORMAL position.
9 - Check alarm relay outputs. Turn SW1 clockwise until both alarm LEDs on the
transmitter illuminate. Verify that both alarm LEDs on the test fixture also illuminate.
Return SW1 to the “0” position. If alarms on the transmitter are programmed for latching,
swipe the programming magnet over PGM1 or PGM2 to reset.
10 - RS-485 Out (P3). The FP-550x and FP-624x operate as Modbus slave devices. RS-
485 operation is checked by connecting to an RS-485 Modbus Master device. Reference
the applicable instruction manual for further information.
5.0 Test Fixture Calibration
The FP Transmitter Test Fixture is calibrated at the Detcon factory. SW1 range
adjustment potentiometers are factory set and should not be adjusted by the user. If
calibration is required, return the test fixture to Detcon for calibration.
6.0 Warranty
Detcon, Inc., as manufacturer, warrants each FP Transmitter Test Fixture for a two year
period under the conditions described as follows: The warranty period begins on the date
of shipment to the original purchaser and ends two years thereafter. Should the test
fixture fail to perform in accordance with published specifications within the warranty
period, return it to Detcon, Inc., 3200 A-1 Research Forest Dr., The Woodlands, Texas
77381, for necessary repairs or replacement.