Accurately meter precise amounts of liquid color into the main flow of natural material directly above the throat of your process machine. Metering is via by the compression and release of a flexible pumping tube by the 6 roller Peristaltic head of the MPA pump.

Positive Displacement Pump

• Series MPA pumps are true positive displacement pumps.
• No seals, check valves or clearances –no internal leakage.
• Self-priming plus passes any air bubbles in the liquid without loss of prime.

Automatic Speed Control

• The MPA use automatic speed control to assure self-adjusting accuracy.
• The pump can be used for both injection molding and extrusion.

Three Tubing Sizes Available

• Various tubing diameters and assemblies are available to provide a wide range of outputs.

Ideal for Most Liquid Color Applications

• MPA Pumps are designed to meter at the very low rates typical of liquid coloring applications.
• High rate liquid applications may be better served by our Model MPA-3-HO (3-5 gallons/hour) or Model MDA Drum Pump (up to 45 gallons/hour).

6-Roller Pump Head

• 6-roller pump with easy access for feeding in the tube provides consistent compression and effective operation.
• Tube compression is consistent by design of the roller head housing.
• Low maintenance - no bearings, dowel pins do not wear out, plus clear viewing window allows operators to easily check operation.

Control Principal

• The Digital Controller maintains precise speed regulation and metering control to ensure absolute accuracy.
• Metering rate is directly related to motor shaft rotation, accuracy is consistent by precisely controlling drive motor rotation.

Control Setup

• A digital counter allows for easy entry of the required settings.
• A simple formula is used based on percent of color required, a predetermined metering rate, and total shot weight in grams (or pounds per hour for extrusion applications).

Hardware Control

• The controller can manage a small fraction of a gram of color being carefully measured.
• The controller contains a DC motor with variable speed control.
• Standard MPA separate with a heavy-duty gearbox with a reduction ratio of 53:1, providing a wide dosing range.

Maintenance

• No part will wear out or need replacing. Occasional cleaning may be necessary.
• Pump tubes must be replaced periodically. Typical tube life is 1 to 6 months.

Inserting Tube

• The tube is laid into the slot across the top of the pump head.
• With rollers turning, the tube is automatically fed into the peristaltic roller housing.

Cleaning

• Clean with soap and water. Disassembly is easy and parts are large.
• The unit must be free of liquid color contamination to operate properly.

Determining Metering Rate

To insure accuracy a METERING RATE must be determined for each color. It is only necessary to determine Metering Rate once for each color. Record Metering Rate for each color for future reference.

1. Switch to CYCLE.
2. Turn CALIBRATION knob (upper right corner) to "CALIBRATE".
   This will force one cycle of 100 counts to be dispensed.
   OR: Set counter to 100 and switch from OFF to CYCLE.
   Plug in SIGNAL cord to force cycle of 100 counts.
3. Run several cycles and record GRAM WEIGHT metered each cycle.
   The average of these weights is the METERING RATE in grams/100ct.
   Example: Each CALIBRATION cycle produces 55 grams output.
   Your METERING RATE is 55 grams/100ct.

MPA Liquid Color Pump - Formulas for setting the counter

INJECTION MOLDING (Cycle Mode):

1. Determine the WEIGHT of the entire shot IN GRAMS.
2. Determine the LBS. of COLOR per 100 LBS. of natural required, (or KILOS of COLOR per 100 KILOS of natural).
3. Determine the METERING RATE for each color in grams/100 counts.
4. Set the digital counter using the following formula:

   (Shot wt) x (lbs/100) / (grams/100ct) = Setting

EXTRUSION (Continuous Mode):

1. Determine the extruder output in pounds per hour.
2. Determine the LBS. of COLOR per 100 LBS. of natural required, (or KILOS of COLOR per 100 KILOS of natural).
3. Determine the METERING RATE in grams/100 counts.
4. Set the digital counter using the following formula:

   (lbs/hr) x (lbs/100) / (grams/100ct) x .71 = Setting

Alternate Formula Method

This method does not require calibration, but instead relies on an accurate knowledge of the weight of the liquid (lbs/gal) and accurate tube sizes.

INJECTION MOLDING (Cycle Mode):

1. Determine the WEIGHT of the entire shot in GRAMS.
2. Determine the PERCENT color let-down desired.
3. Determine the weight of the liquid color in POUNDS per GALLON. or GRAMS per LITER (G/L).
4. Set the digital counter using the following formula:

   (Shot Weight) x (% let-down) x ('C' factor) / (lbs/gal) = Setting
   or (Shot Weight) x (% let-down) x ('C' factor) x 120 / (G/L) = Setting

EXTRUSION (Continuous Mode):

1. Determine the extruder output in pounds per hour.
2. Determine the percent color let-down desired.
3. Determine the weight of the liquid color in pounds per gallon or GRAMS per LITER (G/L).
4. Set the digital counter using the following formula:

   (lbs/hr) x (% let-down) x ('E' factor) / (lbs/gal) = Setting (Use top Calculator)
   or (lbs/hr) x (% let-down) x ('E' factor) x 120 / (G/L) = Setting (Use bottom Calculator)

Extrusion Following Controllers

Formulas for Setting the Counter

1. Determine the MAXIMUM extruder output in pounds per hour, (at 100% of full rated RPM), (max lbs/hr).
2. Determine the POUNDS per 100 of color required (lbs/100).
3. Determine the color METERING RATE; GRAMS / MIN @ display of 40; (gr/min@40), see below: Metering Rate.
4. Set the digital counter using the following formula:

   (max lbs/hr) x (lbs/100) x 3 / (gr/min@40) = Setting

Metering Rate - Extrusion Following Models

METERING RATE equals the GRAMS of material metered in ONE MINUTE when the display is "40".

To determine METERING RATE for a given material:

1. Switch the controller to the MANUAL SPEED position.
   Set the counter to "040".
   The display should also read 40. If necessary, adjust the counter up or down until the DISPLAY reads 40.
2. Carefully collect and weigh the output over 1 minute (60 seconds).
   This weight in grams will equal the METERING RATE for this material
   (gr/min@40)

Example: Your controller is running and the display shows 40. Over a 60 second period you meter 32 grams of material. Your METERING RATE for this material is 32 (grams/min@40).

Alternate Formula Method

Extrusion Following 3 and 6 Roller Pump

This method does not require calibration, but instead relies on an accurate knowledge of the weight of the liquid (lbs./gal.) and accurate tube sizes.

1. Determine the MAXIMUM extruder output in pounds per hour, (at 100% of full rated RPM), (max lbs/hr).
2. Determine the POUNDS per 100 of color required (lbs/100).
3. Determine the weight of the liquid color in pounds per gallon.
4. Set the digital counter using the following formula:

   (lbs/hr) x (% let-down) x ('F' factor) / (lbs/gal) = Setting