18
…6
ROUTINE MAINTENANCE
7
SPARES
If satisfactory results are obtained, including the impedance
checks, then the fault is either the measuring electrode or the
reference electrode – see Section 6.4
6.7 Loss of Sample
The electrodes must not be allowed to dry out after commissioning
the system. If, after commissioning, there is a loss of sample for
more than several hours, the electrodes must either be kept wet
manually or removed and stored correctly. Drying periods are
dependant on ambient conditions.
Caution
. Failure to keep the electrodes wet results in
a shortened working life of the electrodes.
7.1
Models 7651, 7652
Top Cover
7650065 (sealed Reference
Electrode)
Top Cover
7650064 (reservoir Fed)
Clamp Ring
7600640
Stem Flange
7600590
Service Pack
7650040
Small Reference Junction*
1360180
Large Reference Junction*
1360190
Electrode Holder
Assembly
7650050 (sealed Reference
Electrode)
Filling Soln. 3-Pack
7650039 (saturated KCl)
7.2
Models 7654, 7655, 7656
Electrode Holder
Assembly
7650050 (sealed Reference
Electrode)
Electrode Holder
Assembly
7650056 (for use with
mechanical and
ultrasonic cleaners)
Service Pack
7650040
Small Reference Junction*
1360180
Large Reference Junction*
1360190
Skirt
7603410
Filling Soln. 3-Pack
7650039 (saturated KCl)
7.3
Model 7660 (stainless steel)
Top Cover
7650064
Electrode Holder
Assembly
7650051 (reservoir Fed)
Large Reference junction
1360190
Service Pack
7660040
Clamp Ring
7600640
Stem Flange
7600590
Filling solution 3-Pack
7650039 (saturated KCl)
7.4
Reservoir Spares
Reservoir
7650030
Tube Connector
0216451
Large Reference Junction*
1360190
*There are two reference junctions available:
•
1360 180 Small Reference Junction: supplied with all sealed
reference electrodes.Tthe junction is suitable for use in
general applications where the loss of KCl is minimised and
where the pressure can reach 10bar (145 psi).
•
1360 190 Large Reference Junction: supplied with reservoir-
fed reference systems to give a reproducible KCl flow rate.
The junction can be used on sealed reference system on low
conductivity applications to reduce instability problems or on
sample where high level of solids that cause rapid blockage of
the small junction. The large junction must be used only on
flow systems or dip systems operating at atmospheric
pressure.
