Flow Meters – Low Flow – Fixed Orifice, 0-4 to 0-40 GPH, 1.5-5 SCFM

Fixed-Orifice Flow Meters

Orange Research low flow meter models have large dials with bold markings and characters that are easy to read from a distance, handle high line pressure and can be mounted in any orientation.  They are mounted directly in the flow stream, but with bodies machined from solid blocks of metal, they handle high-pressure applications of up to 3000psi.  This makes flow meters a natural choice for hydraulic and pneumatic systems.

These fixed-orifice flow meter models are designed for low flow applications.  The fixed Delrin orifice centered on a Buna-N diaphragm (Viton optional), which provides sensitive responses to changes in flow.  The rate is displayed on an easy-to-read dial face.

Flow Meter – Low Flow – Switches and Relays

A variety of reed switches and relays can accompany the flow meters, or the meter can be supplied on its own, without a dial.  SPST Switches are offered normally open (N.O.) or normally closed (N.C.).  SPDT reed switches are also available.  DPDT relays are offered for high inductance applications, such as those incorporating motors or solenoids.

Calibration – Liquid Flow Meters

For liquids, the low flow meters are calibrated to customer-specified specific gravity and viscosity of the fluid to be measured (up to 150 CS).  Otherwise, standard calibration is on water at 70F.  For oil service, flow meters are calibrated using oil (specific gravity 0.86 CS at 74F).  Special calibration is available to meet customers’ specific gravity and viscosity requirements using selected fluids and a conversion procedure.  Standard calibration is for horizontal mounting; vertical available upon request (no additional cost).

Calibration – Air & Gas Flow Meters

For air and gas applications, the low flow meters are calibrated to air at 100 psig at 70F.  For non-standard fluids or conditions, a conversion procedure is required.  Because gas is compressible, please supply pressure and temperature conditions and type of gas when ordering so the density of gas can be taken into account and noted on the dial face.