The Detcon Model TP Transmitter Test Fixture is designed to test the operation of
Detcon Model TP Series H2S Transmitters. Models covered are series TP-424x, TP524x, TP-550x, and TP-624x.
2.0 Features
Reference figure 1 below for feature locations.
1 - Internal power supply and power switch
2 - Plug-in connector for TP-424 and TP-524 transmitters
3 - MOS sensor open heater switch (SW2)
4 - Heater voltage digital LED meter
5 - Plug-in connector for TP-550 and TP-624 transmitters
6 - mA output digital LED meter
7 - RS-485 output (TP-550 and TP-624)
8 - Fault and alarm relay output LEDs (TP-550 and TP-624)
9 - PPM H2S range selector switch and open film switch
Page 3 of 9
Detcon Model TP Transmitter Test Fixture
3.0 Specifications
Compatible withthe Following Models
Model Series TP-424x, TP-524x, TP-550x, TP624x
Input Power
100-240VAC, 50 / 60Hz
Power Consumption
< 17 Watts
Digital Current Meter
Accuracy: ± 0.3% FS
Digital Voltage Meter
Accuracy: ± 0.1% FS
Warranty
Two year
Outputs
Serial RS-485 Modbus™
4.0 Operation
Before using the test fixture, the technician should first be familiar with the operation of
Detcon TP series hydrogen sulfide gas sensors. Review the applicable sensor instruction
manual(s) for detailed operating instructions.
The test fixture is designed to verify performance of the Detcon TP series transmitters
only. The test fixture circuitry mimics the sensor portion of the complete sensor
assembly.
NOTE 1: The test fixture is designed to be used with only one transmitter at a time.
Plugging more than one transmitter in the test fixture at the same time (P1 and P2) will
cause erroneous readings.
NOTE 2: Reference Figure 1 for location of test fixture components. Before starting
verify that SW1 is in the “0” position and that SW2 is in the “NORMAL” position.
4.1 TP-424x Transmitters
Require tools:
Digital Volt-Ohm Meter (DVM)
Jewelers screwdriver
1 - Turn the power switch on. Both digital LED meters should illuminate.
2 - Plug the TP-424x transmitter into P1.
Page 4 of 9
Detcon Model TP Transmitter Test Fixture
3 - Check the heater voltage. Insert DVM probes into the VOLT “+” and “–“ test points.
Adjust the TEMP potentiometer on the transmitter until you achieve a reading of 5.25V.
Verify that the bridge voltage LED meter on the test fixture tracks closely with a reading
of 5.25V (±0.1V). Verify adjustability to either side of 5.25V.
4 - Check zero signal output. Verify SW1 is in the “0” position. Insert DVM probes into
the signal “+” and “–“ test points. Verify a reading of 40mV. Verify a mA output LED
meter reading of 4.0mA (±0.1mA).
5 - Perform span cal. Turn SW1 to the “25” position. With the DVM probes in the signal
“+” and “–“ test points, adjust the SPAN-COARSE potentiometer on the transmitter
until you achieve a reading of 80mV. Verify that the mA output LED meter tracks closely
with a reading of 8.0mA. Verify adjustability to either side of 80mV. Do the same with
the FINE potentiometer to check adjustability.
6 - Check different ranges. Turn SW1 to the 10 position and verify a signal of
56mV/5.6mA (±10%). Turn SW1 to the 50 position and verify a signal of 120mV/
12.0mA (±10%). Turn SW1 to the 100 position and verify a signal of 200mV/20.0mA
(±10%).
7 - Check heater fault (open heater). Toggle SW2 to the OPEN position and note the
“HET FLT” LED on the transmitter illuminates and the DVM signal reading drops
several mV. Also note that the heater voltage LED display indicates a reading of 0.00
and the mA output LED reading tracks with the mV reading. Return SW2 to the
NORMAL position.
8 - Check signal fault (open film). Turn SW1 to the OPEN FILM position and note that
the “SIG FLT” LED on the transmitter illuminates. The DVM signal reading will also
drop several mV. Note that the mA output LED reading tracks with the mV output
reading. Return SW1 to the “0” position.
NOTE: These instructions cover testing of the main features of the TP-524x transmitter.
See the applicable TP-524x 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 TP-524x transmitter into P1.
3 - Set the heater voltage.
Page 5 of 9
Detcon Model TP Transmitter Test Fixture
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.
Page 6 of 9
Detcon Model TP Transmitter Test Fixture
NOTE: The OPEN FILM function of SW1 is not compatible with the TP-524x
transmitter.
NOTE: These instructions cover testing of the main features of the TP-550x and TP-624x
transmitters. See the applicable TP-550x and TP-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 TP-550x/TP-624x transmitter into P2.
3 - Set the heater 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 “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
Page 7 of 9
Detcon Model TP Transmitter Test Fixture
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 4.0mA (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 and test fixture illuminate 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 SW2to the NORMAL position.
7 - Check signal fault - open film (TP-550 only). Turn SW1 to the OPEN FILM position
and note that the “FLT” LED on the transmitter and test fixture illuminate. Return SW1
to the “0” position.
NOTE: The OPEN FILM function of SW1 is not compatible with the TP-624x
transmitter.
8 - 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.
9 - RS-485 Out (P3). The TP-550x and TP-624x operate as Modbus slave devices. RS485 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 TP 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 TP Transmitter Test Fixture for a two year
period under the conditions described as follows: The warranty period begins on the date
Page 8 of 9
Detcon Model TP Transmitter Test Fixture
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.
Page 9 of 9
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.