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:

GPH .03 – 52.6 Enclosure Rating NEMA 4X (IP66)
LPH .10 – 199 Standards NSF/ANSI 61, CE, cETLus, RoHS
mL/min 1.6667 – 3317 Control Methods Manual, Remote Analog/Digital
Pressure 145 PSI (10 Bar) Power Supply 100 to 240VAC-50/60Hz



  • 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.