CHEM-FEED® MD1 Multi-Diaphragm Metering Pump

Max Feed: .007 – 7.70 GPH (.0029 – 29.2 LPH)

Max Pressure: 150 PSI (10.3 bar)

The MD1 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.

The MD1’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
  • 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 & Interface:

  • Input: 4-20mA external control
  • Input: Remote Start/Stop: Non-powered dry contact closure for remote start/stop
  • Input: Compatible with Flow Verification Sensors S6A and Micro-Flo
  • Output: Alarm relay 250V / 3A
  • Output: Motor On / Off single solid-state

Superior Design:

  • 5 Year Warranty
  • Energy-efficient BLDC motor will not overheat
  • Snap-in-place wall and floor mounting bracket – Patent pending
  • DiaFlex® diaphragm design will last the life of the pump, eliminates the need for expensive rebuild kits – Patented
  • Manifold design allows for multiple configuration possibilities – suction and discharge ports can be positioned on the left and right side of the pump

Safety Features:

  • Diaphragm Failure Detection (DFD) Senses diaphragm rupture by detecting chemical in the pump head. No false triggering – Patented
  • Lockout feature prevents any unwanted tampering – Patent pending
  • Display shield to protect controls from harsh environments

What’s Included:

  • MD1 Multi-Diaphragm Metering Pump
  • Discharge injection fitting with check valve
  • Suction foot valve / strainer
  • Suction ceramic weight
  • Mounting hardware kit
  • Display shield

CHEM-FEED® MD1 Multi-Diaphragm Metering Pump

Max Feed: .007 – 7.70 GPH (.0029 – 29.2 LPH)

Max Pressure: 150 PSI (10.3 bar)

Max. working pressure:
150 psig (10.3 bar)
Max. fluid temperature:185° F (85° C)
Max. Ambient temperature:14 to 115° F/ -10 to 42° C
Maximum viscosity: 1,000 Centipoise
Maximum suction lift:
20 ft. at 0 PSI (6.1 m, 0 bar)
Operating Voltage:100 to 240VAC-50/60Hz
Power Cord:240V50/60Hz = AS 3112 (Australia/New Zealand)
Motor:Brushless DC, 50W
Duty cycle:Continuous
Motor speed adjustment resolution:10,000:1 (00.1% – 100%)
Enclosure:NEMA 4X (IP66), Valox® (PBT) thermoplastic.
Maximum Overall Dimensions:20.74cm W x 24.02cm H x 26.36cm D
Product weight:3.8 Kg
Approximate shipping wt:7.0 Kg