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IV – Applications
IV.1 – Chemical compatibility
Wetted parts are manufactured from PTFE and PFA and are suitable for pumping even the most
corrosive concentrated chemicals: H
2
SO
4
, HNO
3
, HF, H
3
PO
4
, HCl, NH
4
OH, KOH, NaOH, CH
3
COOH,
TMAH, H
2
O
2
...
The viscosity of the liquids must be less 50 cPo
Very abrasive liquids and liquids that crystallize, are not recommended.
Please call SGPPL if you require information on chemical compatibility.
IV.2 – Temperature range
The pump can handle liquids from 41 °F to 180 °F (5 °C to 82 °C).
When the fluid temperature is greater than 140 °F (60
°
C) you must check from time to time that the
delivery/suction manifold nuts are fully tight.
For special applications call SGPPL or your local distributor.
IV.3 – Cleaning
The plastic design of the MDP 50 pump wetted parts allows the use of any cleaning materials.
When flushing the pump, it is better to adjust it for maximum flow per stroke.
IV.4 – Single stroke adjustment
To adjust the stroke, please proceed as follows:
1) Check fluid connections,
2) Prime the pumps until the fluid line is full (no more air bubbles visible in suction and discharge
line). It is recommended to adjust the stem to the maximum stroke.
3) Check the delivered volume of liquid with a calibrated beaker, test tube or a precision balance to
calculate the single stroke.
4) If unit stroke is not as required, screw on the adjustable stem to reduce the stroke, or unscrew it to
increase the volume.
5) Repeat the stroke until you get the required volume of liquid per shot.
6) When the adjustment is achieved lock the position of the adjustable stem with the lock nut.
Now, your pump is ready to run.
CAUTION
: if you modify air pressure and/or air flow rate after adjustment, this will affect the stroke
volume.
Once you have reached the required stroke, the stroke volume is repeatable to +/- 1%.
Nevertheless, we recommend checking the stroke volume regularly, especially if external conditions
are varying (backpressure, suction head, temperature, fluid...)
IV.5 – Limitations of use
To obtain the best results from your pump, you should not:
•
Operate the pump outside pressure ranges
•
Restrict suction side (valves, filters...),
•
Connect the pump inlet with liquid under pressure,
•
Exceed the maximum or minimum temperature limits,
•
Pump too viscous or abrasive liquids,
•
Try to adjust the unit stroke beyond the specified range
•
Exceed the pumping speed
•
Forget to respect connection specifications (see encl. diagrams).
Summary of Contents for MDP 50
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