Products and Services

PLEASE NOTE: Primary Flow Signal, Inc., possessing superior engineering, flow measurement and design capabilities, offers its "Standard Code Flow Products" (SCFP) as a convenience to its customers. However, PFS, Inc. makes no claim or warranty, implied or expressed as to the performance or applicability of any SCFP except that such products shall be fully conforming to any and all Codes according to which such SCFP products are manufactured, and shall be of the highest quality. Unless otherwise specified at time of order placement, PFS, Inc. shall provide SCFP according to ISA standards.

PRIMARY FLOW SIGNAL provides the
PFS-WM Wedge Type Flow Meter

NOW, MORE THAN EVER, PFS CAN TRULY BE YOUR ONE STOP PRIMARY FLOW MEASUREMENT RESOURCE!

In line sizes from 0.5" through 24", the Wedge Type Flow Meter is a differential producer design in the Public Domain which, when utilized, is generally applied in air entrained liquid, particulate entrained, high viscosity or slurry type, most frequently described as difficult-to-meter line fluids. Abrasive or fibrous slurry are examples of possible applications.

Relatively low pipe Reynolds Numbers can be addressed with some accuracy and the discharge coefficient is stable through the application range.

Though accuracy, reliability and headloss characteristics are inferior to that obtained with PFS's HVT (Halmi Venturi Meter) product line(s), if highly viscous, particulate laden flows along with low acquisition cost is of highest priority to the exclusion of the other factors, the PFS-WM Wedge Type Flow Meter can be a metering option worth consideration.

When your application requirements dictate the use of Wedge Type Flow Meters, PFS, Inc. can provide expert technical assistance calculating bore size, differentials and flow rates coupled with high quality and economically priced units to best fit your needs.

Naturally, if you have particular requirements which do not appear in our standard offering, please do not hesitate to ask, since we will gladly design and manufacture to your specific needs.

DESIGN AND OPERATION INFORMATION

The basic system consists of a cylindrical pressure vessel into which a constriction "wedge" is fabricated thereby leaving a open segment of a known height.
Pressure taps which receive the (extended) sealed sensors on either side of the "wedge" provide the differential signal to the PFS Flow Transmitter which is then related, by formula, to the rate of flow occurring through the open segment.
Since no relationship of geometric similitude exists between designs of varying line sizes, No Manufacturer can reliably state a general accuracy, and 2 Sigma confidence is not applicable.

All PFS-WM Wedge Type Flow Meters are Laboratory (Wet) Calibrated for the Application
Conditions Providing a +/- 0.50% of Coefficient Accuracy for the Calibrated Range.

MATERIALS OF CONSTRUCTION

The PFS-WM Design can be produced using a wide variety of materials depending upon the particular service requirements of the specific application. Typical materials selections, however, include Carbon steel, 304 and 316 Stainless steel, Monel, Hastelloy, and PVC for Chlorine and similar chemical applications.

The Sealed Sensor assemblies are of 316 Stainless steel with armored capillary conduits containing .

RELY ON PFS ENGINEERING EXPERTISE TO PROVIDE YOU WITH TECHNICAL
ASSISTANCE IN ALL OF YOUR FLOW MEASUREMENT REQUIREMENTS.

Primary Flow Signal, Inc., 81 Bleachery Court, Warwick, RI 02886. Tel: 401-463-9199; Fax: 401-463-5437.