PEM050 Electronic Metering Pumps

Ultra-High Purity PTFE Dispense Pump

Overview

PEM050 metering pumps accurately dispense 1-50 ml of ultra-pure chemicals. They feature a fully supported rolling diaphragm to maximize discharge pressure capabilities. Positive control valves eliminate variability typical of check valves to ensure accuracy.

PEM050 Electronic Metering Pumps

Features & Benefits

  • Dispense volume ≤50 ml per stroke
  • Electronically-controlled adjustable stroke
  • Fully adjustable stroke speed
  • Highly accurate; ±0.01% repeatable
  • No exposed metalics prevents corrosion and contamination
  • Ultra-pure 100% PTFE wetted surfaces with fully-swept flow path
  • PTFE rolling diaphragm for linear dispense
  • Positive inlet/outlet valving prevents flow through
  • Visual position reference for easy setup and monitoring
  • Leak detection available
  • 2-6 fluid ports; fluid in/out any port
  • Programmable system logic
  • Programmable suckback
  • Quick-change mount for easy install and service
  • Install in any orientation
  • Self-priming
  • Compact footprint
  • Minimal hold-up volume
  • 80 psi discharge capable
  • Clean room assembly, testing and packaging

Operation

The diaphragm is fixed to the internal cylinder and piston. As the motor moves the piston downward, the diaphragm rolls down, which pulls liquid into the chamber. As the motor moves the piston upward, fluid flows out of the chamber. Valves control flow through the ports. Fluid may be dispensed via one port or alternated between ports. Fluid may remain in the chamber to be dispensed as needed.

Software Interface:

PEM050 Metering Pump Software Interface

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Metering Pump Operation

Shown: Fluid is drawn into the chamber via the left port as the piston moves downward. Then, fluid is dispensed via the right port. Animation demonstrates full suction and dispense per stroke.

Metering Pump Operation

Shown: Fluid is drawn into the chamber via the left port as the piston moves downward. Then, 50% of the fluid is dispensed via the top-right port, and suction is applied before the valve closes. The remaining fluid is dispensed via the bottom right port.

Metering Pump Operation

Shown: Fluid is drawn into the chamber via the bottom-left port as the piston moves downward. Then, 30% of the fluid is dispensed via the top-left port, and suction is applied to the line before the valve closes. The remaining fluid is dispensed via the top-right and bottom-right ports, which each dispense 30% and provide suck back.

Metering Pump Operation

Shown: As the piston moves downward, fluid is drawn into the two left ports. Each left port draws a different fluid which mix in the chamber. Then, 30% of the fluid is dispensed via the top-right port, and suction is applied to the line before the valve closes. The remaining fluid is dispensed via the middle-right and bottom-right ports, which each dispense 30% and provide suck back.

Metering Pump Operation

Shown: Fluid is drawn into the chamber via the bottom-left port as the piston moves downward. Fluid is dispensed via the each of the other five ports sequentially, and each dispense alternates with a suction action. Animation demonstrates 80% suction and dispense per stroke.

Specifications

Pump Model
PEM050
Dispense Range
1-50 ml per stroke
Dispense Repeatability
± 0.01% (Full Scale)
Cycles Per Minute
≤ 6 CPM
Air Consumption
SCF per Cycle
1-3 SCFM
Fluid Path Materials
PTFE
Valve Actuation
Air Pressure
4.14 - 5.86 Bar
(60 - 85 psi)
Max Discharge Pressure
5.51 Bar (80 psi)
Temperature Capability
≤ 100°C (212°F)
Weight
1.6 kg (3.5 lb.)
Suction Lift*
4.6 m (15 ft)
Leak Detection Options
Valve Position Sensing
Communication
Serial, Ethernet, or Digital (0-5 V, 0-10 V, 4-20 mA)
Pump Model
PEM050

*Optimized parameters improve repeatability. To maximize repeatability, minimize suction lift, optimize dispense nozzle setup, purge air from fluid chamber, and minimize inlet fluid pressure fluctuations. Tests conducted with water at ambient temperature. Dispense range measured at full stroke with maximum and minimum supply pressures at 80 and 60 psi.

Dimensions

Dimensions: [mm] in

White Knight PEM050 Metering Pump Dimensions

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"A"
"B"
PEM050-02
2.7 (69)
11.0 (279)
PEM050-03
4.2 (107)
12.5 (318)
PEM050-04
4.2 (107)
12.5 (318)
PEM050-05
5.7 (145)
14.0 (356)
PEM050-06
5.7 (145)
14.0 (356)
Download Dimensionals (PDF)

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