CHEM-FEED® MD3 Multi-Diaphragm Metering Pump

Max Feed: .03 – 52.6 GPH (.11 – 200 LPH)

Max Pressure: 145 PSI (10 bar)

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.

  • Enclosure Rating: NEMA 4X (IP66)
  • Standards: NSF/ANSI 61, CE, cETLus, RoHS
  • Control Methods: Manual, Remote Analog/Digital
  • 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

CHEM-FEED® MD3 Multi-Diaphragm Metering Pump

Max Feed: .03 – 52.6 GPH (.11 – 200 LPH)

Max Pressure: 145 PSI (10 bar)

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)
Maximum viscosity: 1,000 Centipoise
Maximum suction lift:
23 ft. Water, 0 psig (7 m, 0 bar)
Operating Voltage:96 to 264VAC-50/60Hz
Power Cord:240V50Hz = AS 3112 (Australia/New Zealand)
Duty cycle:Continuous
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
Display: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
Keypad:Eleven button positive action tactile switch keypad
Enclosure:NEMA 4X (IP66), Polyester powder coated aluminum
Security:Programmable 4-digit password
Approximate shipping wt:20.04 Kg