PART FOUR - SERVICE AND MAINTENANCE
SECTION 3 - TROUBLESHOOTING
PRO-series Model E3 Electrodeless Conductivity Transmitter
7
S
ECTION
3
3.1 Checking Electrical
Connections
3.2 Verifying
Sensor Operation
3.3 Verifying
Transmitter Operation
3.4 Verifying Interconnect
Cable Integrity
When experiencing problems, try to determine the primary
measurement system component causing the problem (sen-
sor, transmitter or interconnect cable, if used).
1. Verify that adequate DC voltage exists at the appropri-
ate transmitter TB1 terminals.
2. Check all transmitter wiring to ensure proper connections.
To verify sensor operation, refer to the procedure in the
troubleshooting section of the sensor operating manual. Or
replace the suspect sensor with a known new or working
sensor and perform calibration.
1.
After disconnecting DC power and the sensor from the
transmitter, connect a 1000 ohm resistor between Ter-
minals 4 (red) and 5 (yellow) on TB2.
2.
Connect a 100,000 ohm resistor between Terminals 1
(white) and 7 (green) on TB2.
3.
Reconnect DC power to the transmitter.
4.
Verify that the transmitter conductivity reading is be-
tween 5.00 and 50.00 mS/cm. Also, verify that the
temperature reading is between -10 and +10
°
C.
If these readings are achieved, the transmitter is operating
properly, but the interconnect cable (if used) may be faulty.
1.
Disconnect DC power from the transmitter. Reconnect
the sensor directly to the transmitter (purposely bypassing
the interconnect cable and junction box, if used).
2.
Place the sensor in a container of saturated salt water
that is at room temperature.
3.
Reconnect DC power to the transmitter.
4.
Verify that the transmitter conductivity reading is be-
tween 150 and 350 mS/cm. If the reading is achieved,
the interconnect cable and/or junction box connections
are probably faulty. Use a digital multimeter to check
the interconnect cable for shorted or open wires.
TROUBLESHOOTING
