Model 520 HT UCA
D01157216
Revision A, October 2015
33
Symptom
Cause
Remedy
Faulty heater.
Replace.
Faulty solid state relay.
Replace.
Temperature display
is erratic.
Faulty thermocouple.
Replace thermocouple.
Loose connection in
thermocouple wiring.
Check for loose wiring and correct
if necessary.
Software will not
start
USB Cable unplugged
Ensure that USB from computer to
back of instrument is connected.
Touchscreen unplugged or
power off
Check power plug, make sure power
button on right side of screen is on.
Pump will not
operate.
Insufficient air pressure to
pump.
Check air supply and make certain
instrument is supplied with air
between 30 and 100 psig. Check air
lines for blockage. Adjust PUMP
AIR PRESSURE ADJUST
regulator to a higher pressure.
Solenoid valve controlling
flow of air to pump is not
functioning.
If no solenoid click is heard when
the PUMP switch is turned to the
ON position, a faulty solenoid valve
is likely
Waveform
amplitude is too low
Not enough ultrasonic
couplant on transducers.
Pressure is below 1000 psi
Dirt or debris on
transducer faces.
Clean transducers and apply new
couplant. Pea size amount is
sufficient.
Increase pressure above 1000 psi.
Clean transducers and apply new
couplant.
Transit time and
compressive
strength values are
erratic.
Not enough ultrasonic
couplant on transducers.
Dirt or debris on
transducer faces.
Bad coaxial cable.
Loose coaxial connector
inside control box.
Pressure was below 1000
psi during test
Clean transducers and apply new
couplant. Pea size amount is
sufficient.
Clean transducers and apply new
couplant.
Replace cable.
Check connections and tighten if
necessary.
Check data file and make certain
pressure remains above 1000 psi
during a test
Water comes out of
Faulty high pressure seal.
Replace the high pressure seal and
