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 MetersEngineered Venturi Flow Meters for Accurate, Efficient Flow Measurement
PFS offers Venturi flow meters engineered for high accuracy and reliability, with low permanent pressure loss, and dependable performance across a wide range of flow conditions.
Designed for liquids, gases, and steam, as well as high-viscosity line fluids, solids-bearing line fluids, and contaminated line fluids, these meters give engineers flexible options for municipal, industrial, and specialized applications.
Lower Operating Cost Through Reduced Pressure Loss
Helps reduce energy loss and support more efficient system operation.
Reliable, Low-Maintenance Performance
No moving parts help minimize maintenance and support long-term performance.
Versatile for Clean & Challenging Process Media
Multiple designs available to fit different systems, media types, and installation needs.
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
Metal 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 MetersEngineered Orifice Flow Meters for Flexible, Cost-Effective Flow Measurement
PFS offers orifice flow meters for reliable, economical measurement across a wide range of clean liquid, gas, and steam applications.
As one of the most widely used differential flow technologies, orifice meters offer a practical solution for many process conditions. With options such as orifice plates, flange unions, and holding block technologies, they support a range of piping arrangements while allowing for straightforward replacement and lower upfront cost.
Cost-Effective Flow Measurement
Offers an economical measurement solution with low initial capital cost for many standard clean fluid applications.
Flexible Installation Options
Multiple primary elements, union, and meter run configurations help accommodate different piping schemes and project requirements
Easy Replacement & Serviceability
Orifice-based designs support straightforward plate replacement and practical long-term maintenance.
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
+/- 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 MetersEngineered Wedge Type Flow Meters for Viscous, Dirty, & Slurry-Type Line Fluids
PFS offers wedge-type flow meters engineered for reliable flow measurement in some of the most difficult operating conditions.
Built for highly viscous, contaminated, slurry-type, air-entrained, and particulate-laden fluids, wedge-type flow meters give engineers a practical solution where other flow technologies may be less effective.
Reliable Performance in Difficult Fluids
Handles viscous, contaminated, slurry-type, and air-entrained media with confidence.
Reduced Risk of Plugging & Build-Up
The wedge design creates a larger, more forgiving flow path that helps reduce clogging, scaling, and material accumulation.
Reliable, Low-Maintenance Operation
No moving parts help minimize maintenance and support long-term performance.
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 Meters
View All PTC 6 Flow Nozzle MetersEngineered Orifice Flow Meters for Flexible, Cost-Effective Flow Measurement
PFS offers orifice flow meters for reliable, economical measurement across a wide range of clean liquid, gas, and steam applications.
As one of the most widely used differential flow technologies, orifice meters offer a practical solution for many process conditions. With options such as orifice plates, flange unions, and holding block technologies, they support a range of piping arrangements while allowing for straightforward replacement and lower upfront cost.
Cost-Effective Flow Measurement
Offers an economical measurement solution with low initial capital cost for many standard clean fluid applications.
Flexible Installation Options
Multiple primary elements, union, and meter run configurations help accommodate different piping schemes and project requirements
Easy Replacement & Serviceability
Orifice-based designs support straightforward plate replacement and practical long-term maintenance.
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 Meter & Measurement Accessories
View All Flow Meter & Measurement AccessoriesFlow Measurement Accessories for Complete Differential Pressure Metering Systems
PFS offers flow measurement accessories designed to support accurate, reliable performance in differential pressure flow metering systems for liquid, gas, and steam applications.
From secondary instrumentation and temperature measurement to flow conditioning, valve control, and packaged system components, these accessories help engineers build, protect, and optimize complete flow measurement solutions.
Built to Support System Performance
Helps round out dP flow metering systems with the accessories needed for installation, operation, and performance.
Designed for Accuracy & Protection
Supports dependable measurement while helping protect instrumentation in demanding applications.
Flexible Options for System Design
Multiple accessory options are available to match media types, system layouts, and process requirements.
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 SolutionsReliable, Custom Flow Measurement for Unique & Challenging Applications
PFS offers specialty flow meters and custom flow measurement solutions for applications that require something beyond standard flow technologies.
From open-conduit and low-flow environments to tight spaces and specialized process conditions, these meters are designed to deliver dependable performance across municipal, industrial, and other demanding systems.
Solutions for Specialized Applications
A strong fit for open-conduit flow, low-flow service, and other specialized measurement challenges.
Application-Specific Design Flexibility
Multiple specialty meter designs help address different systems, installation requirements, and operating conditions.
Backed by Custom Engineering Support
Custom engineering services help ensure the right solution for your process and performance goals.
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