Features of EWN-A series

Automatic Air Vent Mechanism

An air vent valve builtin pump chamber enables reliable air venting. The pump immediately resumes operation without gas lock even after a long period of stoppage. Also equipped manual air vent valve enables easy pressure release in discharge piping. Gaseous liquid such as sodium hypochlorite or hydrogen peroxide can be injected without gas locking.

High Resolution

The stroke rate can be set with 1 spm increments in between 1 and 360 spm. The stroke length adjustment further assists fine adjustment that the stroke rate adjustment cannot reach. Contentious precise chemical feeding is now available.

Multi Voltage

The use of the multi voltage circuit design allows the pump to work anywhere in the world.

Pump Body

The use of the integrated controller reduces a sealing area, so that the water-/dust-proof design of IP65 is attained. Also, a plastic cover protects the control panel under an adverse environment.

Principle of operation

  • Air which comes from suction port goes to the connection adapter through pump head. Because pump discharge side is pressurized, air goes to the automatic air vent valve which the pressure load is lower than pump discharge side, and goes out little by little together with liquid.
  • Once the pump gets out of locked air condition, it returns to normal operation to discharge the liquid. A ittle bit of liquid is discharged from automatic bleed valve, too.

Specifications of pump

Discharge capacity range 30 – 110 mL/min
Max. discharge pressure range 0.7 – 1.0 MPa
Main materials PVC, PTFE
Stroke rate 1 – 360 spm
Power voltage 100 – 240 VAC 50/60 Hz
Liquid temperature range -10 – 40°C
Viscous liquid Please contact us for details.

Specifications of controller

Operational mode MAN 0.1 – 100% stroke rate
EXT DIV (Dividing) /1 – 9999
MULT (Multiply) ×1 – 9999
ANA.R (Analog, rigid) 4 – 20, 0 – 20, 20 – 4, 20 – 0 mA
ANA.V (Analog, variable) 2 points 0.0 – 20.0 mA range   0.0 – 100% stroke rate
Control function STOP/Pre-Stop Pump keeps running when Pre-STOP is activated. Pump stops when STOP is activated.
Prime Pump runs at max. stroke rate while up and down keys are pushed.
Key lock Key can be locked and unlocked.
Calibration Discharge capacity per shot is calculated automatically by operating and stopping pump at calibration mode to make flow rate indication possible.
Buffer memory ON or OFF is selectable. Max. 65535 stroke pulses are put in memory.
Input Pulse Non Voltage contact or open collector, Max. 200 Hz
Current DC 0 – 20 mA (Input resistance 200 Ω)
Level sensor No Voltage contact or open collector, 2-steps contact
AUX Pump runs at max.stroke rate while AUX signal is input.
Output Photo-MOS relay AC/DC 24 V 0.1 A
STOP, Synchronous with stroke
Synchronous with stroke is standard.
Power Voltage 100 – 240 VAC  50/60 Hz (90 – 264 VAC)

 

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