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MODEL 3081 pH/ORP SECTION 12.0
TROUBLESHOOTING
12. 5.13 Transmitter Locks Up
A. Turn the dc power off, then turn it back on.
B. If the problem persists, replace the electronic board stack (PN 23574-02).
12. 5.14 Transmitter Periodically Restarts Itself
A. The problem is usually related to improperly wired RTD input terminals.
1. The RTD return wire must be connected to TB-3. The RTD sense wire must be connected to TB-4, and the RTD
in wire must be connected to TB-5. See the wiring diagrams in Section 3.0. If the pH sensor does not have an
RTD, connect a jumper wire across the terminals TB-3 and TB-4 and a second jumper across TB-4 and TB-5.
2. If the RTD connections have been jumpered as described in step B, automatic temperature compensation must
be turned off and the transmitter operated in manual temperature mode. See Section 8.5 for the procedure.
B. If RTD wiring is correct and problems still persist.
1. Monitor the dc power supply. Be sure the power is not intermittent and the correct voltage is present. See
Section 2.5.
2. Try connecting the transmitter to a different power supply.
12.6 SYSTEMATIC TROUBLESHOOTING
This section contains troubleshooting flow charts for use with either external preamplifiers, or the transmitters internal pre-
amplifier.
a. If an accessible preamplifier is in the sensor or remote junction box, use Figure 12-5.
b. If the preamplifier is in the transmitter or if the sensor has a built in (potted) preamplifier, use Figure 12-6.