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CHEM-FEED® Multi-Diaphragm Metering Pump

The MD3 Multi-Diaphragm Metering Pump delivers smooth, continuous chemical feed even when injecting chemicals that off-gas like Peracetic Acid and Sodium Hypochlorite.  The cutting-edge Hyperdrive Technology allows for alternating pumping action between two diaphragms: when one diaphragm is in the suction phase, the other is in the discharge, resulting in a smooth chemical feed profile and eliminating the chance of vapor lock and loss of prime.

The MD3’s exclusive DiaFlex® Diaphragms will last the life of the pump, eliminating the need for expensive rebuild kits.

Technical Overview:

.03 - 52.6
.10 - 199
1.6667 - 3317
145 PSI (10 Bar)
Enclosure Rating
NEMA 4X (IP66)
Control Methods
Manual, Remote Analog/Digital
Power Supply
100 to 240VAC-50/60Hz
3D Visualizer


  • Exclusive Hyperlink Drive technology allows for smooth chemical feed – Patent Pending
  • Dual Diaphragm with full stroke technology will not lose prime, ideal for pumping chemicals that off-gas (Peracetic Acid, Sodium Hypochlorite)
  • Can pump chemicals continuously, like a peristaltic pump, without the need for tube assemblies
Communication and Interface:
    • Operator friendly digital touch pad with menu driven software.
    • VGA Graphic multi-color backlit LCD displays remote/local control status, motor speed,
    • output rate, input signal values, service and alarm status.
    • Inputs include: 4-20mA, 0-10Vdc, and Pulse inputs for remote external speed control and 0-30 VDC / contact closure remote start/stop
    • Outputs include: Scalable 4-20mA or pulse, one 250V/6A relay and three 115V/1A contact closures assignable to monitor up to 17 different pump functions including TFD, FVS, remote/local control setting, motor on, fault, current operating mode, and others.
Superior Design:
  • 5 Year Warranty
  • 2,000:1 turndown ratio
  • NEMA 4X (IP66) wash-down, chemically resistant powder coated enclosure
  • Large PVDF, Ceramic, double ball check valves without metal springs
Safety Features:
  • Diaphragm Failure Detection (DFD) senses diaphragm rupture, preventing hazardous chemical spills
  • Security programmable 4-digit password to prevent tampering
Optional Components Available:
  • Mounting Extended Brackets (72000-557) – 1 Pair, SS, 4 SS Screws
What’s Included:
  • MD3 Multi-Diaphragm Metering Pump
  • Suction foot valve / strainer
  • Mounting hardware kit
  • Fitting Kit
    • ½” M/NPT straight and elbow connections
    • ½” Hose barb straight and elbow connections
    • Union nuts


Maximum Working Pressure
  • 145 psig (10 bar)
Maximum Fluid Temperature
  • PVDF connections: 185 F (85 C)
Ambient Operating Temperature
  • 14 F to 115 F (-10 C to 46 C)
Ambient Storage Temperature
  • -40 F to 158 F (-40 C to 70 C)
Operating Voltage
  • 115VAC/60Hz, 1ph (2.0 Amp Maximum)
  • 230VAC/60Hz, 1ph (1.0 Amp Maximum)
  • 220VAC/50Hz, 1ph (1.0 Amp Maximum)
  • 240VAC/50Hz, 1ph (1.0 Amp Maximum)
  • 230VAC/50Hz, 1ph (2.0 Amp Maximum)
Power Cord Options
  • 115V60Hz = NEMA 5/15 (USA)
  • 230V60Hz = NEMA 6/15 (USA)
  • 220V50Hz = CEE 7/VII (EU)
  • 240V50Hz = AS 3112 (Australia/New Zealand)
  • 230V50Hz = BS 1363/A plug (United Kingdom)
  • NEMA 4X (IP66), Polyester powder coated aluminum.
Maximum Overall Dimensions
  • 16-1/8”W x 15-1/4”H x 15-5/16”D (40.9W x 38.7H x 38.9D cm)
Approximate Shipping WT
  • 53 lb. (24.04 Kg)
  • 1/4 HP Brushless DC motor
Motor Speed Adjustment Range
  • 2,000:1 (0.05% – 100% motor speed)
Motor Speed Adjustment Resolution
  • 0.1% increments > 10% motor speed
  • 0.01% increments > 1% motor speed and < 10%
  • 0.001% increments < 1% motor speed
Maximum Viscosity
  • 1,000 Centipoise
Maximum Suction Lift
  • 23 ft. Water, 0 psig (7 m, 0 bar)
  • 3 color VGA backlit LCD, UV resistant.
Display Resolution
  • 0.0 > 10% motor speed
  • 0.00 > 1% motor speed and < 10%
  • 0.000 < 1% motor speed
Display Languages
  • English, Spanish, French or German selectable.
  • Eleven button positive action tactile switch keypad.
  • Programmable 4-digit password.



Replacement Parts

ImageNameCatalog Number


CHEM-FEED Municipal Comparison Chart
3.15 MB May 17, 2022
MD3 Engineering Specifications
59.50 KB February 16, 2022
MD3 Instruction Manual – 80000-583
8.08 MB June 27, 2022
MD3 Technical Data Sheet 85000-127
1.34 MB January 3, 2023
MD3 w/ Skid System Engineering Specifications
67.00 KB February 10, 2022
Municipal Accessories Guide – 85000-178
1,021.20 KB April 29, 2022
Municipal Brochure
11.69 MB July 6, 2022
Municipal Catalog 2023 – 80000-708
13.09 MB February 9, 2023

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