Guildline Autosal 8400B - Page 65

Section 12
TM8400B-L-00
1 November 2004
12-4
PROBLEM
SYMPTOM
PROBABLE CAUSE
4.
No Heating
Heater Lamps off
continuously
Ambient temperature is too high.
Sample temperature too high, flow rate too
fast.
Rear panel exhuast fan not working.
Control Circuit malfunction.
- check heater lamps
- check for power to heater lamps
- heater control SCR may be defective.
5.
Cell Polarizing
Bubbling or
discoloration of one
electrode
Depolarizing circuit defective.
- check output of circuit - it should average to
zero.
6.
Flushing
Malfunction
Cell arms not
flushing or filling
properly
Air pumps defective
- see pump maintenance
Air lines broken/disconnected.
Flushing manifold tubes blocked with salt
buildup
- disconnect from air line and flush tubes with
warm soap solution under pressure then air
dry.
7.
Sample not
Flowing
Heat exchanger blocked.
Air pump defective.
Air lines broken/disconnected.
Sample bottle not sealed properly.
8.
Zero Shift
Non zero display
when in zero function
position.
Non zero display
when distilled water
sampled.
Amplifier has been saturated
- allow several minutes for circuitry to
recover from overload.
Conductivity circuit amplifier offset.
- check circuit and calibrate if necessary.
Temperature shift.
Reference voltage deteriorated.
Analog to digital converter drifting (very
unlikely due to auto zero mode.)
9.
Standby
Standby number has
changed
Conductivity circuit gain error or meter gain
wrong.
- check meter test value; if this value has
changed, adjust meter gain, otherwise check
conductivity circuit.