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): 3.5.0 to 10.0 percent
- Recommended Pipe Reynolds Number: Greater than 75,000
Sealed Meter System (SMS) for Contaminated Flow Measurement
The Primary Flow Signal Sealed Meter System (SMS) is engineered to deliver accurate, reliable flow measurement in applications containing contamination, such as sewage and sludge, without the risk of plugged impulse lines. By eliminating traditional pressure tap exposure, the SMS provides consistent performance in solids-bearing and challenging fluids where conventional differential pressure systems struggle.
A key advantage of the Sealed Meter System is its ability to support maintenance and calibration without removing components or interrupting flow. The use of sealed diaphragm sensors and optional dual or triple DP transmitters allows the system to extend measurable flow ranges while maintaining precise, repeatable flow documentation. The SMS is available for Cast Iron, Ductile Iron, and Fabricated Venturi flow meters, offering flexibility across municipal and industrial installations.
Key SMS Advantages & Features:
- In-Service Calibration & Maintenance: DP transmitters can be calibrated without removing components or shutting down the system.
- Sealed Diaphragm Protection: Eliminates impulse line plugging and air entrapment in contaminated services.
- Accessible Inspection Points: High- and low-pressure points can be inspected without removing the meter from service.
- Long Service Life: No moving parts and reduced susceptibility to erosion extend product lifespan.
- Minimal Installation Effects: No downstream effect and minimal upstream straight-run requirements.
- High-Velocity Capability: Well suited for demanding, high-velocity flow conditions.
- Wide Turndown Ratios: Ratios of 10:1, 20:1, 50:1, and greater achievable depending on meter design and instrumentation.
- Flexible Installation: Designed to mount in any orientation to accommodate system constraints.
The Sealed Meter System is commonly used in wastewater treatment plants for raw sewage, sludge, and other solid-bearing or contaminated fluids where reliability and low maintenance are critical. It is also well suited for potable water treatment applications, including water treatment plant processes requiring accurate, compliant flow measurement.
Sealed Meter HVT Venturi System Specifications
16” to 96” for 3” SMS.
Uncalibrated (2 Sigma): +/- 0.50%
Sealed Meter HVT Venturi System Model Types
Model Types
- HVT-SMC – Diaphragm Seal Cast Iron HVT Venturi
- HVT-SMD – Diaphragm Seal Ductile Iron HVT Venturi
- HVT-SMF – Diaphragm Seal Fabricated HVT Venturi
Sealed Meter System Materials
Common Materials
- Cast Iron or Ductile Iron Body
- 304 or 316SS throat
- Stainless Steel (304/316)
- Carbon Steel
*Also available in other materials
Sealed Meter System Certifications
PFS is a contributor to various international standards committees, fully supporting our staff’s memberships to these commissions.
Individual products follow relevant industry regulations, including requirements specific to the oil and gas, water/wastewater, and power generation industries.
PFS maintains the following certifications, standards & compliances:
- ISO 9001
- AGA
- ASME S & U
- API
- ANSI
- European Pressure Equipment Directive (PED)
Applications
Municipal Wastewater Treatment
The Sealed Meter System is widely used in wastewater treatment plants for accurate measurement of raw sewage, sludge, and other solids-bearing or contaminated fluids. Its sealed diaphragm design eliminates plugged impulse lines, making it ideal for influent, effluent, and process flows where reliability and low maintenance are critical.
Potable Water Treatment
In potable water treatment plants, the SMS provides dependable flow measurement for treatment and distribution processes. NSF-61 approved coatings and in-service calibration capability support regulatory compliance while maintaining continuous operation without interrupting flow.
Sealed Meter System Expertise Since 1983
Engineered for Contaminated Flow Applications
For more than 40 years, PFS has advanced Venturi flow measurement through practical, field-driven innovation. The Sealed Meter System was engineered to solve the reliability challenges of dP measurement in sewage, sludge, and other contaminated services. Sealed diaphragm sensing eliminates exposed impulse lines, delivering stable, repeatable measurement where conventional systems fail.
Built for Accuracy, Longevity & Uptime
The SMS supports in-service calibration and maintenance without removing components or stopping flow. When paired with dual or triple DP transmitters, the system extends turndown while maintaining accuracy across changing conditions. With no moving parts and reduced susceptibility to erosion, it delivers long service life and low total cost of ownership.
Backed by PFS Service & Support
Every SMS is supported by PFS application and service specialists—from sizing and instrumentation selection to commissioning, calibration support, and lifecycle services—ensuring dependable performance in critical wastewater and potable water applications.
