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V1.0/08/13
ENGLISH
Adjusting the Spring Pretension and Stroke Length
6. Adjusting the Spring Pretension and Stroke Length
The spring pretension controls the reset force of the hand grips, the stroke limitation con-
trols the length of the pump stroke and, thus, the pump volume of the test kit.
The spring pretension and stroke length are adjusted using the knurled nut.
1 Screw the locking nut towards the bottom stop to release the fi xation of the
knurled nut.
2 Screw the knurled nut towards the top or bottom stop to adjust the spring pre-
tension and stroke length.
Ä Top stop: Spring pretension is increased, pump stroke is reduced.
Ä Bottom stop: Spring pretension is reduced, pump stroke is increased.
3 Screw the locking nut against the knurled nut to lock the knurled nut in place.
Piston rod
Locking nut
Adjustment at
bottom stop:
Stroke = max.
Spring = min.
Adjustment at top
stop:
Stroke = min.
Spring = max.
Knurled nut
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