Smiths Graseby 3200, Technical & Service Manual

Page: 35 / 117

Smiths Medical International Ltd.
Issue 5 (August 2004)
3200 Service Manual 2 — 13
Occlusion thrust
Thrust checks
Figure 2.2 Thrust measuring set up
The following thrust checks use the weights that correspond to the factory-set occlusion
threshold levels for a 3200 (i.e. 3.5 and 4.2 kg). If a different occlusion level setting is required,
the weights must be adjusted accordingly.
The thrust adjustment procedures are shown on page 2-14.
1. Set the pump's plunger clamp to approximately midway along its support tube.
2. Remove the plunger from a BD 60 ml syringe and saw the end off the syringe. Place the
modified syringe onto the pump so that it will act as a guide for the weight support rod and
also position the size sensor flag (see
Figure 2.2).
3. With the pump switched ON , set the infusion rate to 200 ml/hr.
4. Place the pump in a vertical position, with its left hand side uppermost (see Figure 2.2).
5. Place the weight support rod through the modified syringe and onto the pump's plunger
clamp.
6. Place a weight of 3.5 kg on top of the weight support and check that the pump operates for
between 30 and 60 seconds and does not occlude (i.e. the alarm does not sound). Remove
the weight.
7. Place a weight of 4.2 kg on top of the weight support and check that within 60 seconds the
pump does occlude (i.e. the alarm sounds).