Loss Of Sample; Models 7651, 7652; Models 7654, 7655, 7656; Model 7660 (Stainless Steel) - ABB 7651 Instruction Manual

...6 ROUTINE MAINTENANCE
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.
18

7 SPARES

7.1 Models 7651, 7652

Top Cover
Top Cover
Clamp Ring
Stem Flange
Service Pack
Small Reference Junction*
Large Reference Junction*
Electrode Holder
Assembly
Filling Soln. 3-Pack

7.2 Models 7654, 7655, 7656

Electrode Holder
Assembly
Electrode Holder
Assembly
Service Pack
Small Reference Junction*
Large Reference Junction*
Skirt
Filling Soln. 3-Pack

7.3 Model 7660 (stainless steel)

Top Cover
Electrode Holder
Assembly
Large Reference junction
Service Pack
Clamp Ring
Stem Flange
Filling solution 3-Pack

7.4 Reservoir Spares

Reservoir
Tube Connector
Large Reference Junction*
*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.
7650065 (sealed Reference
Electrode)
7650064 (reservoir Fed)
7600640
7600590
7650040
1360180
1360190
7650050 (sealed Reference
Electrode)
7650039 (saturated KCl)
7650050 (sealed Reference
Electrode)
7650056 (for use with
mechanical and
ultrasonic cleaners)
7650040
1360180
1360190
7603410
7650039 (saturated KCl)
7650064
7650051 (reservoir Fed)
1360190
7660040
7600640
7600590
7650039 (saturated KCl)
7650030
0216451
1360190