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Liquid Flow Controllers | FLV400

Liquid Flow Controllers

£820.00 FLV401-(*)

  • Linear 0 to 5 Vdc Output Signal
  • Liquid Flowrates as Low as 13 ml/min
  • Superior Long Term Stability, Accuracy and Repeatability
  • Removable Sensor
  • Very Low Average Power Demand (Approximately 1.25 Watts)
Variable Area Flowmeters, Rotameters & Switches - View related products


The FLV400 Series Controller accurately measures and controls liquid flows. The sensors are matched to the servo valve for each of the ranges to be covered up to 2 l/min in liquids. A linear electrical output signal is provided for recording data. These controllers eliminate the need for continuous monitoring and readjustment manually of gas or liquid pressures to provide a stable fluid flowrate. The heart of the FLV400 is the flow sensor, which uses a Pelton-type turbine wheel to determine the flowrate of the fluid. Rotation rate of the turbine wheel is linear over a wide dynamic range. The electro-optical system consists of a diode emitting energy in the infrared spectrum. Light energy is alternately reflected and absorbed from “spokes” deposited upon the small turbine wheel. Such reflected light energy is detected by means of a photo diode. Thus, as the turbine wheel rotates in response to fluid flowrates, electrical pulses are generated. Processing circuitry provides a dc voltage output proportional to the flow rate. A bi-directional linear stepper motor moves a micro-flow control valve in response to any error between the desired flow and the actual flowrate as measured by this flow sensor. In addition, very precise flowrate settings may be set and maintained automatically over long periods of time. Provisions are available to change the flow rate from one setting to another remotely. Flowrate is uni-directional and is marked for proper direction on the serial number nameplate.
Place Order(Specify Model Number)
Part Number/ Desc.
FLV401-(*) Star
Availability: 6 weeks
RoHS compliant
13 to 100 ml/min
FLV402-(*) Star
Availability: 6 weeks
RoHS compliant
20 to 200 ml/min
FLV403-(*) Star
Availability: 6 weeks
RoHS compliant
50 to 500 ml/min
FLV404-(*) Star
Availability: 6 weeks
RoHS compliant
60 to 1000 ml/min
All amounts shown in EUR, GBP, or USD
Note: *Specify inlet/outlet pressure.

Comes complete with operator's manual and 0.9 m (3') cable with 9-pin D connector and mating connector with strip leads cable.

For optional 4-PT NIST Certificate add suffix "-NISTWATER" to the model number, add $300 to price. (FLV401-(*) certificate has only 3 PTs.)