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7025 Instruction Manual (Rev. 2)
4.2 Rate
The speed control potentiometer adjusts the geared motor to the desired speed, which is
indicated on the 3-digit LED display labelled
STROKE P.M.
(see Figure 3 “Front Panel”).
The speed is unaffected by either mains voltage variations or changes of torque load
brought about by different stroke volumes, different cylinder/piston combinations, airway
alterations, status of the lubrication, etc.
The digital display assures excellent reproducibility: you adjust the actual speed of the
geared motor against a displayed number, in lieu of trying to overlap a pointer and a
scale mark.
The digital reading involves the incertitude of the last figure. E.g., 150 STROKES P.M.
could be any value between 150 and 150.9.
4.3 Stroke
Volume
The stroke volume is adjustable via the
STROKE
VOLUME
knob (
14
,
see Figure 1 “Linkage”) located on the front panel (see Figure 3 “Front
Panel”)
while the pump is either running or at standstill
.
Volume is clearly indicated by a pointer on a stationary dial (
15
): see
picture and Figure 4 “Stroke Volume Scale”.
The scale indicates the volume obtained with 10ml cylinder/piston as-
sembly.
Please refer to Table 1 ”Stroke Volume Indication” table to find the vol-
umes obtained when different pistons are used.
See also paragraph 4.4.
Figure 4 “Stroke Volume Scale”
4.3.1
Volume Scale Reading
VOLUME SCALE
READING
1 ml Piston
(reading / 10) ml
5 ml Piston
(reading / 2) ml
10 ml Piston
actual reading ml
30 ml Piston
(reading x 3) ml
1
0.1 0.5 1 3
2
0.2 1 2 6
3
0.3 1.5 3 9
4
0.4 2 4 12
5
0.5 2.5 5 15
6
0.6 3 6 18
7
0.7 3.5 7 21
8
0.8 4 8 24
9
0.9 4.5 9 27
10
1 5 10 30
Table 1 ”Stroke Volume Indication”
