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 Fabricated Venturi Flow Meter (HVT-FV)
± 0.50% Uncalibrated Uncertainty
Low Loss, Municipal & Industrial Applications
- Line Size: 1/2″ to 144″
- Head Loss % of Differential: 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Cast Iron/Ductile Iron Venturi Flow Meters (HVT-CI, HVT-DI)
± 0.50% Uncalibrated Uncertainty
Low Loss, Municipal & Industrial Applications
- Line Size: 4″ to 96″
- Head Loss % of Differential: 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Fabricated/Plastic Insert Venturi Meter (HVT-FI, HVT-PI)
± 0.50% Uncalibrated Uncertainty
Low Loss, Internal / Flange Mounted
- Line Size: 3″ to 144″
- Head Loss % of Differential (Venturi): 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Rate of Flow Controller (HVT-FC)
± 0.50% Uncalibrated Uncertainty
Low Loss, Control Flow Rate
- Line Size: 4″ to 96″
- Head Loss % of Differential (Venturi): 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Sealed Meter HVT Venturi System (HVT-SMS)
± 0.50% Uncalibrated Uncertainty
Low Loss, Highly Contaminated Fluid
- Line Size: 6” to 14” for 2” SMS; 16” to 96” for 3” SMS.
- Head Loss % of Differential (Venturi): 3.5 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Classical Venturi (CV)
± 1.0% to 1.5% Uncalibrated Uncertainty
Clean Liquids, Gases
- Line Size: 2” to 48”. Larger sizes available.
- Head Loss % of Differential: 10 to 25 percent
- Recommended Pipe Reynolds Number: Greater than 200,000
Rectangular Venturi Meter (HVT-RV)
± 0.75% Uncalibrated Uncertainty
Low Loss, For Rectangular Conduits
- Line Size: 3” to 144”. Larger sizes available.
- Head Loss % of Differential: 5.0 to 12.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
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). 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.
Orifice Plates (OP)
Flow Measurement / Flow Restriction
+/- 0.5-0.75% Uncalibrated Uncertainty
Clean Liquids & Gases, Lower Cost
- Line Size: ½” to 48” standard (special sizes available)
- Recommended Pipe Reynolds number: Greater than 10,000
- Meets ISO, AGA, ASME, API requirements
Orifice Unions (OU)
+/- 0.5 to 0.75% Uncalibrated Uncertainty
Lower Cost, Field Welded Install
- Line Size: ½” to 40”
- Meets ISO, AGA, ASME, API requirements
- Flange Taps / Corner Taps
Orifice Meter Runs (PFS-OMT)
+/- 0.5 to 0.75% Uncalibrated Uncertainty
Liquids & Gases, Pipe Spools Included
- Honing available
- Supplied with any combination of NDE required
- Meets ISO, AGA, ASME, API requirements
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.
Wedge Type Flow Meter (WM)
± 4.00% Uncalibrated Uncertainty
Dirty Liquids & Slurries
- Line Size: 1/2″ to 30″
- Head Loss % of Differential: 30 to 80 percent
- Recommended Pipe Reynolds Number: Must be greater than 5,000
Wedge-X Flow Meter (WX)
± 3.00% Uncalibrated Uncertainty
Integral Manifold, Replaceable Wedge
- Line Size: 2″
- Head Loss % of Differential: 25 to 60 percent
- Recommended Pipe Reynolds Number: Must be greater than 5,000
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”
- Head Loss % of Differential: 60% to 85% beta dependent
- Recommended Application, THROAT Reynolds Number: Greater than 500,000
ASME Long Radius Flow Nozzle
± 2.00% Uncalibrated Uncertainty
Liquids and Gases, High-Velocity Flow
- Line Size: 2” to 24”
- Head Loss % of Differential: 30% to 85% beta dependent
- Recommended Pipe Reynolds Number: Greater than 10,000
ASME PTC 19.5 Throat Tap Flow Nozzle
± 0.70% Uncalibrated Uncertainty
High Accuracy
- Line Size: 4” to 28”
- Head Loss % of Differential: 60% to 85% beta dependent
- Recommended Application, THROAT Reynolds Number: Greater than 500,000
ISA 1932 Flow Nozzle
± 0.80% to 1.20% Uncalibrated Uncertainty
Liquids & Gases, Lower Uncertainty
- Line Size: 2” to 20”
- Head Loss % of Differential: 30% to 85% beta dependent
- Recommended Minimum Pipe Reynolds Number: Greater than 20,000
Venturi Nozzle
± 1.21% to 1.74% Uncalibrated Uncertainty
Liquids and Gases, Lower Loss
- Line Size: 2.5” to 20”
- Head Loss % of Differential: 5% to 20%
- Recommended Pipe Reynolds Number: Greater than 150,000
Flow Measurement Accessories
View All Flow Measurement AccessoriesAccessories for differential pressure flow metering equipment and for liquid, gas and steam flow measurement.
Vent Cleaners (VC)
To Clear & Maintain Tap Holes For Blockage Prevention
Rod Out Pressure Sensing Ports
- Common sizes: 1/4″, 1/2″, 3/4″
- Removes obstructions and prevents blockages in pressure-sensing lines
- Fully customizable
Differential Pressure Transmitters (TM)
dP Flow Measurement or Static Pressure, Multi-Variable
Water, Wastewater, Air, Steam, Oil, Viscous Liquids & Gases
- Customization & Wide Range of Brands Available
Thermowells
Thermometer
To Measure Fluid Temperature for Most Gases, Steam & Liquids
- Resistance or Thermocouple Temperature Measurement
- Available with Temperature Sensing Element and Thermowell
Flow Master (FM)
Complete, Packaged Flow Metering System
For Secondary Instrumentation
- Pre-assembled Enclosure
- Easy Installation
- Various Accessory and Mounting Options Available
Condensate Chambers & Seal Pots (CC)
To Separate Fluids & Protect Instrumentation
For Steam & Corrosive Fluids
- Line Size: 2 to 4”
Flow Conditioners (FC)
Stabilize Flow Profile
Tube Bundle, Plate Types
- Ensure Optimal Accuracy
- Reduce required upstream length
- Various Styles and Designs Available
Specialty Flow Meters & Custom Flow Measurement Solutions
View All Specialty Flow Meters & Custom Flow Measurement SolutionsPFS offers specialty flow meters and solutions 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.
Fabricated Venturi Low Flow Meter (FV-LF)
± 0.50% Uncalibrated Uncertainty
Low Reynolds, Lower Loss
- Line Size: 3/8” to 12”
- Head Loss % of Differential: 20.0 to 40.0 percent
- Recommended Pipe Reynolds Number: Greater than 6,000
Fabricated Elbow Meter (FE)
± 4.00% Uncalibrated Uncertainty
Low Cost, Small Space Required
- Line Size: No limitations
- Recommended Pipe Reynolds Number: Greater than 50,000
Halmi Nozzle (HN)
± 2.00% Uncalibrated Uncertainty
Low Cost, Open Channel Application
- Line Size: 6” to 48”
- Head Loss % of Differential: Low
- Service Life: 25 years plus, depending on materials
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.