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Figure 5-2
Rollers (A) and guides (B) on the pump rotor
5.1.2 Pump Tube
Replacement
A
B
A
b. Pump Rotor – Look for debris build-up on the pump
roller or guide surfaces (Figure 5-2). Clean when
needed (section 5.1.3).
c. Housing – Look for debris inside the pump housing.
Clean as necessary (section 5.1.4). (Debris inside the
housing is usually evidence that a pump tube failed.)
The correct sampler pump tubing is easily recognized by the blue
alignment collars. Table 5-1 lists part numbers for replacement
pump tubes. 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 prematurely. Also note that the discharge
tube is not the same as the pump tube.
Refer to Figure 5-1 and the following steps to replace the pump
tube.
1. Press the On/Off button to place the sampler in the
Standby state. This ensures that the sampler will not
attempt to operate the pump.
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.
Place the sampler controller in the Standby state before
opening the pump housing.
Isco 4700 Refrigerated Sampler
Section 5 Maintenance
B
WARNING
5-3
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