NEWDOSE Metering Pump Selection: Reading the Manual and Model Codes

NEWDOSE metering pump selection does not require reading the manual cover to cover. Use flow and pressure to decide whether you need the solenoid half or the mechanical half, pick the row in that series table that covers your duty, then finish the code on the selection code page with materials, power supply and capacity control. That usually takes about ten minutes. This guide is for buyers and process engineers holding the NEWDOSE catalog, and it only covers series and codes actually printed in it.

How the NEWDOSE metering pump selection manual is organized

The manual has two blocks. The first covers solenoid diaphragm pumps: a materials and power page, the DFD table with dimension drawings, then the DP, DM and DC series. The second covers mechanical diaphragm pumps. It opens with the multi-function check valve, the 3 MPa diaphragm assembly and the electric stroke actuator, then lists each series, and ends with the selection code page and an installation diagram.

The mechanical series covered here are NDJ, NDWS, NDWL, ND1000, ND2000 and HND.

Step one of NEWDOSE metering pump selection: flow and pressure

For NEWDOSE metering pump selection, remember that solenoid pumps suit small doses. The DFD table runs from DFD-02-16 (2 L/h at 16 bar) to DFD-50-02 (50 L/h at 2 bar); as flow rises, the pressure rating falls. If your dose is a few dozen litres per hour or less and line pressure is modest, stay in the solenoid half.

Above that, or for steady round-the-clock duty, open the mechanical half. From the tables:

40–150 L/h, up to 10 bar: NDJ, which can mount directly on a chemical tank.
8–386 L/h, small sizes up to 16 bar: NDWS.
275–530 L/h at 4.5–7 bar: NDWL.
660–1200 L/h at 3–5 bar: ND1000.
500–2000 L/h at 3–10 bar: ND2000.
47–160 L/h at 12–30 bar: HND, with SS316 heads only.

For pressures above 12 bar at modest flow, go straight to HND; our HND high-pressure pump guide covers its limits.

Reading solenoid model codes

Solenoid codes follow control mode, flow, pressure and material. The control mode is the field that matters most in NEWDOSE metering pump selection:

DFD is manual stroke-rate adjustment. DP follows external pulses. DM follows a 0/4–20mA current signal. DC uses RS-485, and the manual notes it is a free protocol, not Modbus or Profibus. If the pump must talk to a PLC, picking the wrong prefix wastes everything after it. The four series are compared in NEWDOSE solenoid pump models.

Flow and pressure are two digits each, so DFD-12-07 means 12 L/h at 7 bar. Material codes are PPV, PVT, PVDF, SST and PTFE, and power is 230V or 115V. For projects shipped to 110V regions, check that field twice. The DC section also has a page on multi-pump control through a touch screen that replaces the old control box and shows each pump's run state and stroke rate.

The mechanical selection code page, field by field

The page that closes NEWDOSE metering pump selection uses the format NDWL-410-0.6-PVT-A-H, with six fields:

Series name.
Flow in L/h.
Pressure in MPa, not bar.
Wetted material group: PVT, PVDF, SST or PTF.
Power: A is a standard three-phase 380V motor, AVF a variable frequency motor with its own fan, AEX an explosion-proof motor rated Exd II BT4, B a 220V motor, C special requests.
Capacity control: H manual, I electric stroke length adjustment.

One small trap: the solenoid code writes PTFE while the mechanical code page writes PTF. Copy the code from the matching page so the supplier does not have to come back and ask.

The manual's second worked example is a good lesson in NEWDOSE metering pump selection: 6 kg maximum head, 370 L/h needed, PVDF head, variable frequency motor and manual stroke. The result is NDWL-410-0.6-PVDF-AVF-H. The flow field reads 410, not 370, because you step up one size for margin.

Two more columns worth reading

Mechanical tables also list stroke length, diaphragm diameter, stroke rate and displacement per stroke. Two models in one series may give similar flow at 118 and 177 SPM; the slower one generally wears valves less, which helps with viscous or slightly dirty chemicals. Diaphragm diameter also tells you which spare parts to stock, so note it during NEWDOSE metering pump selection rather than after delivery.

Pages buyers skip in NEWDOSE metering pump selection

Do not skip the installation diagram. It shows where the back pressure valve, diaphragm pressure gauge, safety valve, pulsation dampener and calibration column go. The mechanical pump manual adds that when the pressure difference across the pump is under 1 bar, a back pressure valve is needed to hold accuracy. The electric stroke actuator page explains remote 4–20mA stroke control, which is the alternative to a VFD when a DCS must set the flow.

Conclusion

NEWDOSE metering pump selection follows a simple path: flow and pressure pick the half, the series table picks the size, the code page fills in materials, power and control, and the installation page lists the accessories. On solenoid pumps watch the control prefix; on mechanical pumps watch that pressure is in MPa. Compare series in our mechanical diaphragm pump selection guide and browse the mechanical metering pump range or the NEWDOSE brand page. Send us chemical, concentration, flow, pressure and control signal, and contact our engineers to confirm the code.

FAQ

Can I treat the flow in the NEWDOSE metering pump selection tables as real flow?

Not directly. It is measured with clean water at maximum pressure, so real chemicals and back pressure usually reduce it.

Does the solenoid code in NEWDOSE metering pump selection show the head material?

Yes. The last field, PPV, PVT, PVDF, SST or PTFE, is a full material group covering head, diaphragm, seats, balls and seals.

How do I get 4–20mA control on a mechanical pump?

Choose I for electric stroke length adjustment. Another route is AVF, a variable frequency motor driven by an inverter.

Which code do I use for hazardous areas?

Choose AEX for the Exd II BT4 explosion-proof motor. If the site needs a different rating, confirm it with the design and safety review first.

What if my flow is not listed in the manual?

Check the next size up and see whether stroke adjustment covers your range. If not, send your duty to the factory and follow its written reply.