All Primary Flow Signal Products
Primary Flow Signal offers a large selection of primary flow elements for your flow measurement needs. See our complete directory of flow products below.
Venturi Flow Meters
View All Venturi Flow MetersVenturi flow meters offer high accuracy and reliability for flow measurement of pressurized line fluids, including liquids, gases, and steam, as well as high-viscosity line fluids, solids-bearing line fluids, and harsh or contaminated line fluids.
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HVT-FV Fabricated Venturi
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Municipal & Industrial Applications
- Line Size: 1/2 to 144 inches.
- Headloss % of Differential: 3.50 to 10.0 percent
- Recommended pipe Reynolds number: Greater than 75,000
HVT-CI Cast Iron/ HVT-DI Ductile Venturi
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Municipal & Industrial Applications
- Line size: 4 to 96 inches.
- Head loss % of Differential: 3.50 to 10.0 percent
- Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy
HVT-FI Fabricated Insert Venturi / HVT-PI Plastic Insert Venturi
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Internal / Flange Mounted
- Line size: 3 to 144 inches
- Head loss % of Accuracy: 3.50 to 10.0 percent
- Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy
HVT-FC Rate of Flow Controller
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Control Flow Rate
- Line size: 4 to 96 inches
- Head loss % of Differential (Venturi): 3.50 – 10.0 percent
- Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy
HVT-SMS Sealed Meter System
+/- 0.50% Uncalibrated Uncertainty
Low Loss, Highly Contaminated Fluid
- Line sizes: 6 to 14 inches for 2 inch SMS; 16 to 96 inches for 3 inch SMS
- Head loss % of Differential (Venturi): 3.50 to 10.0 percent
- Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy
CV Classical Venturi
+/- 1.00% to 1.50% Uncalibrated Uncertainty
Clean Liquids and Gases
- Line size: 2 to 48 inches
- Head loss % of Differential: 10 to 25 percent
- Recommended pipe Reynolds number: Greater than 200,000 for basic accuracy. Consult PFS for lower Reynolds use.
HVT-RV Rectangular Venturi
+/- 0.75% Uncalibrated Uncertainty
Low Loss, For Rectangular Conduits
- Line size: 1/2 to 96 inches. Larger sizes available.
- Head loss % of Differential: 5.0 to 12.0 percent
- Recommended pipe Reynolds number: Greater than 75,000 for basic accuracy
Orifice Flow Meters
View All Orifice Flow MetersOrifice primary flow elements, flange unions, and holding block technologies offer optimum flexibility for applications with diverse piping schemes, ease of replacement, and a low capital investment. The orifice plate is one of the most common differential elements for measuring clean liquids, gases, and vapor (steam) flow.
PFS application specialists can help you select from our wide range of stock product configurations, or our engineers can custom tailor a solution for your specific orifice flow meter requirements.
OP Orifice Plates
Flow Measurement / Flow Restriction
+/- 0.5-0.75% Uncalibrated Uncertainty
Liquids and Gases, Lower Cost
- Line size: 1/2 to 40 inches
- Meets ISO, AGA, ASME, API requirements
- Recommended pipe Reynolds number: Greater than 10,000 basic accuracy
OU Orifice Unions
+/- 0.50 to 0.75% Uncalibrated Uncertainty
Lower Cost, Field Welded Install
- Line size: 1/2 to 40 inches
- Meets ISO, AGA, ASME, API Requirements
- Flange Taps / Corner Taps
Orifice Meter Runs
+/- 0.5 to 0.75% Uncalibrated Uncertainty
Liquids and Gases, pipe spools included
- Honing available
- Meets ISO, AGA, ASME, API Requirements
- Supplied with any combination of NDE required
Wedge Type Flow Meters
View All Wedge Type Flow MetersWedge flow meters are designed for highly viscous, slurry type, or contaminated line fluid applications, including difficult-to-meter, air entrained liquids, as well as particulate entrained, high viscosity, or slurry solutions. Examples of these applications include: raw sewage, sludge, tar sands, pulp mash, cement, liquid asphalt, and molten sulfur.
WM Wedgetype Flow Meter
+/- 4.00% Uncalibrated Uncertainty
Dirty liquids and Slurries
- Line size: 1/2 to 30 inches
- Head loss % of Differential: 25 to 60 percent
- Recommended pipe Reynolds number: Must be greater than 500 for basic accuracy
WX Wedge-X Flow Meter
+/- 4.00% Uncalibrated Uncertainty
Integral Manifold, Replaceable Wedge
- Line size: 2 inches
- Head loss % of Differential: 25 to 60 percent
- Recommended pipe Reynolds number: Must be greater than 5000 for basic accuracy
PTC 6 Flow Nozzle Meter
View All PTC 6 Flow Nozzle MeterOur PTC flow nozzle meters are high-performance differential-producing flow measurement devices used as the primary element for steam turbine acceptance tests. The meters are specifically manufactured in accord with the requirements of the ASME Performance Test Code 6 (PTC6) for steam turbines.
Nozzles are available in flanged and weld-in styles, and feature interior surfaces that are precision machined for cylindricality and a hydraulically-smooth surface. For weld-in flow nozzles, a code-recommended inspection port with a removable, contoured plug is available.
ASME PTC 6 Flow Nozzle
+/- 0.25% Always Calibrated
Highest Accuracy / Repeatability
- Line size: 4 to 28 inches
- Head loss (permanent pressure loss) in % of Differential: 60% to 85% (18% to 25% with optional outlet diffuser cone), Beta Dependent
- Recommended Application, THROAT Reynolds Number: Greater than 500,000
Long Radius Flow Nozzle
+/- 2.00% Uncalibrated Uncertainty
Liquids and Gases, High-Velocity Flow
- Line size: 2 to 24 inches
- Head loss % of Differential: 30 to 85 percent, Beta Dependent
- Recommended Pipe Reynolds number: Greater than 10,000 for basic accuracy
ASME PTC 19.5 Throat Tap Nozzle
+/- 0.70% Uncalibrated Uncertainty
High Accuracy
- Line size: 4 to 28 inches
- Head Loss (permanent pressure loss) in % of Differential: 60% to 85% (18% to 25% with optional outlet diffuser cone), Beta Dependent
- Recommended Application, THROAT Reynolds Number: Greater than 500,000 for basic accuracy
ISA 1932 Flow Nozzle
+/- 0.80% to 1.20% Uncalibrated Uncertainty
Liquids and Gases, Lower uncertainty
- Line size: 2 to 20 inches
- Head Loss % of Differential: 30 to 85, Beta Dependent
- Recommended Minimum Pipe Reynolds Number: Must be greater than 20,000 for basic accuracy
Venturi Nozzle
+/- 1.21% to 1.74% Uncalibrated Uncertainty
Liquids and Gases, Lower Loss
- Line size: 2.5 to 20 inches
- Head loss (permanent pressure loss) in % of Differential: 5% to 20%
- Recommended Pipe Reynolds Number: Greater than 150,000 for basic accuracy
Flow Accessories
View All Flow AccessoriesAccessories for differential pressure flow metering equipment and for liquid, gas and steam flow measurement.
#1 VC Vent Cleaners
Clear & Maintain Tap Holes
Rod Out Pressure Sensing Ports
- Removes obstructions and prevents blockages in pressure sensing lines
- Common sizes: 1/4″, 1/2″, 3/4″
- Fully customizable
#2 TM Transmitters
Pressure, dP, Multi-Variable
Wide Range of Options
- dP flow measurement or static pressure
- Rosemount, ABB, Honeywell, Yokogawa and more brands available
- In-house service and customization
#4 Thermowells
Thermometer
To Measure Fluid Temperature
- Resistance or Thermocouple Temperature Measurement
- ABB, Honeywell, Yokogawa and more brands available
- Available with temperature sensing element and thermowell
#5 FM Flow Master
Pre-Assembled Enclosure
Transmitters, Manifolds, Recorders
- Complete flow metering system
- Various accessory and mounting options available
- Ease of installation
#7 CC Condensate Chambers
Separate Fluid and Instrument
Steam & Corrosive Fluids
- Line size: 2 to 4 inches
#8 FC Flow Conditioners
Stabilize Flow Profile
Tube Bundle, Plate Types
- Ensure optimal accuracy
- Reduce required upstream length
- Various styles and designs are available
Specialty Flow Meters
View All Specialty Flow MetersSpecialty flow meters offered by Primary Flow Signal designed for open-conduit flow for water, sewage, sludge or any other non-pressurized material.
Our specialized flow meters are designed to deliver accurate and reliable measurements across a variety of challenging applications. From low flow environments to high-pressure systems, our meters are engineered to cater to your unique requirements. Dive into our collection and discover custom solutions that ensure unparalleled performance and efficiency.
FV-LF Fabricated Venturi – Low Flow
+/- 0.50% Uncalibrated Uncertainty
Low Reynolds, Lower Loss
- Line size: 3/8 to 12 inches
- Head loss % of Differential: 20.0 to 40.0 percent
- Recommended pipe Reynolds number: Greater than 6,000 for basic accuracy
The Fabricated Venturi Low Flow Meter is a specially designed meter combining performance elements of both orifice and venturi type devices and provides an accurate solution for wide range flow applications.
FE Fabricated Elbow Meter
+/- 2.00% Uncalibrated Uncertainty
Low Cost, Small Space Required
- Line size: No limitations on line size
- Recommended pipe Reynolds number: Greater than 50,000 for basic accuracy
In circumstances where traditional high accuracy flow meter solutions are impractical or impossible, the Elbow Meter as detailed in publications such as ASME Fluid Meters and R.W. Miller Flow Measurement Engineering Handbook, may be a favorable option.
HN Halmi Nozzle
+/- 2.00% Uncalibrated Uncertainty
Low Cost, Open Channel Application
- Line size: 6 to 48 inches
- Head loss: Low
- Service life: 25 years plus depending on materials
The Halmi Nozzle is an open channel device and was developed for free discharge into tanks or lagoons and pipe to pipe applications in a manhole, for instance. The Halmi Nozzle solution is ideal for open channel custody transfer or billing applications and utilizes a wide range of secondary instrumentation to provide an ideal solution to an open channel requirement.
To further enhance our application solution process, we offer a wide range of options including CFD, model testing and field calibrations. Once our meters are installed, we also offer a full range of field service solutions including training and inspection. Whether you’re dealing with industrial, pharmaceutical, mining, oil & gas or municipal environmental flows, trust our specialty meters to provide the precision you need.
Contact us today for a customized flow meter solution tailored to your specific requirements.