Preso

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Phone: 951-926-0675

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Preso Meters is a fully integrated manufacturer of precision-engineered primary flow elements, serving the industrial, commercial and municipal markets for over 30 years

Preso products include the innovative Ellipse® Pitot tube, the COIN® segmented wedge flow meter, and three unique versions of Venturi-type meters and inserts. With this family of products, Preso can provide a flow meter for any process that can be measured with differential pressure technology, often at calibrated accuracy of better than ±1% of reading.

Preso also manufactures the B-Plus® and C+ metering and balancing valves for the HVAC industry, as well as a line of FM-approved fire pump gages, and many other accessories including flow transmitters and test kits.

Why Ellipse?

The Ellipse^® is Designed to Work Better

The PRESO ELLIPSE flow meter is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing-edge disturbances: As a result of its innovative design the ELLIPSE is capable of greater accuracy than a conventional sensor in measuring the actual DP signal. With the ELLIPSE, your measurement is absolutely precise and proportional to the actual flow rate.

Proven Superior

Extensive tests performed in recognized laboratories such as Alden Research, CEESI, NRC, etc., have demonstrated that the PRESO ELLIPSE exhibits accuracies ±0.75%. The ELLIPSE also achieved an impressive turndown ratio of 17:1. These flow meters are even FM approved for use as fire pump flow metering systems

Incomparable Advantages

When you look carefully at PRESO quality and performance you can clearly see where your advantage lies with the ELLIPSE.

	Ellipse Shape Flow boundary layers attached to the probe's surface, no separation effects on the low (static) pressure Turndown ratio of 17:1; no vacuum effects Very high repeatability No vortex generation Accuracy of ±0.75% Lowest drag coefficient (lowest pressure loss in the industry)

	Round Shape Low (static) pressure signal affected by separation Turndown ratio of 4:1; vacuum effects Variable intensity vortices generated behind (downstream), leading the probe to create signal amplifications, vibrations and acoustic problems Accuracy of ±1.5% to 3% High drag coefficient inducing high pressure loss

	Square Shape High vortices area resulting from the large bluff body obstructing the flow stream Turndown ratio of 10:1; vacuum effects Highest drag coefficient of existing pitot type probes (i.e. highest pressure loss) Claimed accuracy of ±1% Vibration and acoustic problems

ELLIPSE PITOT TUBES

AR-Regular (2"-72")

General Purpose: air, gas, liquid

AF-Flanged (2"-120")

General Purpose: Air, gas and liquid.

150# 316SST sensor flange

AS-Steam (2"-72")

Steam Applications

Max Pressure 600psi

Max Temp: 480degF

Saturated or superheated steam

ASF-Steam (2"-72")

Flanged model

AHR-Wet Tap, Low Pressure (2"-36")

Air, Gas, Liquid, for liquids without system shutdown

Insert Max Pressure: 75psi

Max Operating Pressure: 150psi

Max Operating Temp 150 degF

AHL-Wet Tap, Low Pressure (2"-30")

Air, Gas, Liquid, for liquids without system shutdown

Max Pressure: 800psi

Max Temp 800 degF

AHL-GD Hot-tap model with gear drive

Air, Gas, Liquid and gas without system shutdown

Max Pressure: 800 psi

Max Temperature: 800deg F

AHS Hot-Tap Steam (2"-24")

Hot-tap model used on saturated and super heated steam

Max Pressure 800 psi

Max Temp 800 deg F

VENTURI INDUSTRIAL

Preso Catalog for Venturi Meters

Model SSL Classic desgin (Hershel)

The Classical Style Venturi Tube is designed in accordance to ASME and/or ISO standards and will offer excellent accuracy and high repeatability

Model SSM-Hydraulic Shape Design (Ventrui-Nozzle)

The Preso Hydraulic pure static design utilizes the proven classical ASME and ISO standards for highest accuracy, predictability and repeatability. The flow conditioning generated by the unique hydraulic shape will provide an extremely stable signal in a wide range of flows.

Model LPL-Low-loss design (Short Form)

The Low-Loss Design with over 35 years of proven field performance in a wide varitey of applications provides reduced operating costs inherent with this design. Low installation costs due to short laying length and the wide range of sizes and material of construction, make the LPL the right choice for many flow applications.

Model VISSL-Insert Type Classic Design

The Insert Type Classical Style is designed to the same ASME and/or ISO standards as the standard model. Manufactured of all 304 stainless steel, the Venturi insert design offers the advantage of low installation and operation costs.

Model VISSM-Insert Type Hydraulic Shape Design

The Preso hydraulic pure static design is also available in the Model VISSM insert type. This unique hydraulic shape generates a flow condition that provides an extremely stable signal in a wide range of flows.

Model VILPL-Insert Type Low-Loss Design

The Preso low-loss design is also available in the stainless steel insert type. The all 304 stainless steel construction provides excellent corrosion and temperature resistance, while the short form style allows for added plant design flexibility.

B-Plus Valve

B-Plus Catalog

The B-Plus Balancing Valve features Preso's "Low-Loss" Venturi design, unsurpassed in the industry for low permanent pressure loss and low energy consumption. The B-Plus is accurate to ±2% and installs in any position with minimum upstream and downstream piping requirements. The B-Plus is available in 15 sizes from 1/2" (12.7mm) to 10" (254mm) with sweat, FNPT, flanged and grooved-end connections. Many options are available: pressure and temperature ports, quick-disconnect fittings, readout gages and transmitters.

C+ Valve

100% positive shut-off stainless steel ball valve
Stainless steel strainer 20 mesh
3/4" NPT ports for thermometer, RTD, pressure gage, or other instrumentation
1/4" NPT ports for DP measurement across strainer
2" NPT port for by-pass line
NPT port for strainer outlet - blowdown valve
Sizes from 2-1/2" to 4" (Coming soon in sizes 1/2" to 2")

FIRE PUMP SYSTEM

The Preso Fire Pump Flow Meter System is an FM-approved simple, precise and economical method of testing fire pump performance. The Preso system may be used instead of the typical hose valve header and hose method. Flow monitoring is easily achieved by allowing the operator to read the water flow directly in GPM or l/s. Two types of meters are available: fixed for pipe or wall mounting; and a self-contained portable unit which includes hoses, carrying case and bleed valves.

The single most important advantage for the system design engineer is the choice of primary elements offered by PRESO:

The Preso Venturi with its well known engineering principle, little or no maintenance and low permanent pressure loss; with minimum requirements for upstream (5 dia.) and downstream (2 dia.) straight pipe length.
The Preso Annular Element (Pitot tube) - also maintenance-free and with low permanent pressure loss, installed economically by insertion into the pipe at right angle to the flow. The system comes complete with weld-coupling, packing gland and instrument valves.

Size: 1.25-16"

Max Pressure:500 psig

Max Temp: 180 degF

Size 2 to 16" ellipse annular meter with FGE gauge

Size: 2" to 16" Round annular meter with FGE gauge

HVAC Air Flow

The Preso AYR Ellipse Air Flow Measuring Sensors are available for single or multiple installations in round, square or rectangular ducts. The unique patented elliptical design provides high accuracy and repeatability with low permanent pressure loss

ELLIPSE COMMERCIAL PRODUCTS