EUTECH INSTRUMENTS ALPHA PH 500 PHORP 2-WIRE TRANSMITTER (REVISION 1), Instruction Manual

Page: 22 / 28

19
7 TROUBLE SHOOTING GUIDE
Problem Cause Solution
Power on but no display a). Loose connections
b). Cables not in correct polarity (+
and – position).
a). Check cables are making good contact.
b). Re-wire loop cables with correct
polarity.
Unstable readings a). Air bubbles in probe.
b). Dirty probe.
c). Probe not deep enough in sample.
d). External noise pickup or induction
caused by nearby electric motor.
e). Severe Reference junction fouling.
a). Tap probe to remove bubbles.
b). Clean the probe and re-calibrate.
c). Make sure sample entirely covers the
probe sensors.
d). Switch to Symmetrical mode and
connect PMP.
e). Replace probe.
Slow response a). Dirty / Oily probe. a). Clean probe. See “Probe Care &
Maintenance”, page 15.