4700 Refrigerated Sampler Service Guide
Section 1 Introduction and General Guidelines
1-7
Figure 1-3
Rollers (A) and guides (B) on the pump rotor
b.
Pump Rotor
– Look for debris buildup on the pump
roller or guide surfaces (Figure 1-3). Clean when
needed (Section 1.4.3).
c.
Housing
– Look for debris inside the pump housing.
Clean as necessary (Section 1.4.4). Debris inside the
housing is usually evidence that a pump tube failed.
1.4.2 Pump Tube
Replacement
The correct sampler pump tubing is easily recognized by the blue
alignment collars. Pump tubing from non-Isco vendors and tubes
designed for other types of samplers should not be used.
Incorrect pump tubing may result in poor pump performance or
even cause parts to fail. Also note that the discharge tube is not
the same as the pump tube.
Refer to Figure 1-2 and the following steps to replace the pump
tube.
1. Disconnect the power to the sampler to ensure that it will
not attempt to operate the pump.
WARNING
The sampler has a safety interlock that prevents the pump
from operating when the pump housing band is open. DO
NOT tamper with the pump housing and band. The pump is
extremely powerful. The pump can injure you severely if the
sampler activates the pump while you are working on it.
Remove power from the sampler before opening the pump
housing.
A
A
B
B
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