Pulsafeeder PULSAtron Series HV EN - Manual (Page 5)

5
3.0 INTRODUCTION
These installation, operation and maintenance instructions cover your electronic metering pump. Refer to the pump data
label to determine the actual model.
3.1 Principle Of Operation
Diaphragm metering pumps are used to dispense chemicals or fluids. This is achieved by an electromagnetic drive
mechanism (solenoid), which is connected to a diaphragm. When the solenoid is pulsed by the control circuit it displaces
the diaphragm, which, through the use of check valves, moves the fluid out the discharge under pressure. When the
solenoid is de-energized it returns the diaphragm and pulls more fluid into the pump head and the cycle repeats.
The pump stroke rate is controlled by an internal circuit and is changed by turning the rate knob. The mechanical stroke
length is controlled by the stroke length knob. Some models do not allow stroke rate control and do not have the stroke
rate knob.
3.2 Materials Of Construction
The wetted materials (those parts that contact the solution being pumped) available for construction are FPP (glass filled
polypropylene), PVC, CSPE, Viton, PTFE or FTF, 316 Stainless Steel, PVDF, Ceramic and Alloy C. These materials are
very resistant to most chemicals. However, there are some chemicals, such as strong acids or organic solvents, which
cause deterioration of some elastomer and plastic parts, such as the diaphragm, valve seats, or head.
Consult a Chemical Resistance Guide or Supplier for information on chemical compatibility.
Various manufacturers of plastics, elastomers and pumping equipment publish guidelines that aid in the selection of
wetted materials for pumping commercially available chemicals and chemical compounds. Two factors must always be
considered when using an elastomer or plastic part to pump chemicals. They are:
The temperature of service: Higher temperatures increase the effect of chemicals on wetted materials. The increase
varies with the material and the chemical being used. A material quite stable at room temperature might be affected at
higher temperatures.
Material choice: Materials with similar properties may differ greatly from one another in performance when exposed to
certain chemicals.
4.0 INSTALLATION
The metering pump should be located in an area that allows convenient connections to both the chemical storage tank
and the point of injection. The pump is water resistant and dust proof by construction and can be used outdoors,
however, do not operate submerged. Avoid continuous temperatures in excess of 104
˚F (40˚C). To do otherwise could
result in damage to the pump.
4.1 Mounting
Typical mounting arrangements are shown in Figures 3, 4, and 5.
Important: Injection point must be higher than the top of the solution supply tank to prohibit gravity feeding,
unless suitable backpressure is always present at the injection point. Installation of an anti-siphon valve will
prohibit gravity feeding.
For wall or shelf mounting refer to Figure 3. Connect suction tubing to suction valve of chemical pump. Suction valve is
the lower valve. Tubing should be long enough so that the foot valve/strainer assembly hangs about 1-2 inches (2-5 cm)
above the bottom of chemical tank. To keep chemical from being contaminated, the tank should have a cover.
Flooded suction mounting (installing the pump at the base of the chemical storage
tank, Figure 4) is the most trouble free type of installation and is recommended for
very low output requirements. Since the suction tubing is filled with chemical,
priming is accomplished quickly and the chance of losing prime is reduced.
To mount pump, drill four holes of .25” (6 mm) diameter in the shelf as shown in
the dimension drawing (figure 2). Attach pump securely using four #10 (M5) bolts
and nuts.
The pump can be mounted on top of a solution tank as shown in Figure 5. Install
chemical pump on the cover. Insert suction tubing through the center hole and cut
tubing so foot valve/strainer hangs about 1 or 2 inches (2-5 cm) above the bottom
of the tank. Mount the chemical pump rigidly by d
rilling four .25” (6 mm) holes and
using four (4) #10 (M5) screws and nuts.