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Laboratory Flow Meter Apparatus: Venturi and Orifice Proving Fluid Experiments
Quick Answer
A Venturi or orifice flow meter apparatus for physics and fluid mechanics labs proves the Bernoulli principle and measures actual pressure drop against flow rate. Silver Automation Instruments supplies the primary element, differential pressure transmitter, and optional PT100 temperature sensor for DN15 to DN50 test loops. Send us your pipe diameter, water or air flow range, and accuracy target and we will return a complete lab quotation.
What a Venturi and Orifice Lab Apparatus Must Include
Most university and technical college setups start with a clear acrylic or stainless steel test section. The test section holds a Venturi tube or an orifice plate. Across that primary element, two pressure taps connect to a differential pressure transmitter. For water tests, a small pump and a return tank complete the loop. For air tests, a blower and a flow straightener help reduce swirl.
We have supplied transmitters for both types. A common lab range is 0 to 25 kPa for DN20 and DN25 test sections. The transmitter output is normally 4-20 mA with HART. The lab data logger records the 4-20 mA signal and compares it against a manual rotameter or an electromagnetic flowmeter reference.
Specific Numbers That Change the Quote
Pipe size changes the primary element cost quickly. DN15 is common for teaching rigs but more sensitive to edge sharpness on an orifice plate. DN25 and DN50 are easier to keep stable over repeated student runs. Orifice beta ratio between 0.4 and 0.7 gives usable differential pressure without excessive permanent pressure loss. For a water flow of 0.5 to 10 m3/h in DN25, the differential pressure often lands between 1 kPa and 40 kPa depending on beta ratio.
Temperature compensation matters when labs run warm water or compare gas experiments. A PT100 sensor can be installed downstream of the primary element. The transmitter takes the temperature signal and corrects density. This is useful for air experiments because density shifts with ambient temperature and barometric pressure.
For a standard DN25 water rig, we pair a stainless steel orifice plate with a beta ratio of 0.55 with our SI-3151DP differential pressure transmitter, a PT100 sensor, and an SVR series paperless recorder. A Venturi version with the same transmitter can reduce permanent pressure loss when the lab pump has limited head.
Why Laboratories Use This Apparatus for Proving Fluid Experiments
The core experiment is simple. Testers set a flow rate. The Venturi or orifice produces a pressure drop. The student records differential pressure, static pressure, and temperature. Then the student calculates volumetric flow rate from the Bernoulli equation and a discharge coefficient. The result is compared against the reference flowmeter.
Most engineers skip the impulse line check and blame the transmitter first. Here is the thing. In practice, most errors come from impulse line bubbles, not from the transmitter. A 1 percent transmitter can show a 5 percent error if air bubbles sit in the impulse lines. That is why lab kits should include clear vinyl impulse tub
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Lab Apparatus That Moves to Pilot and Process Lines
Some customers start with a laboratory flow meter apparatus and later move to a small pilot plant. The transmitter and wiring can stay the same. The primary element changes from an acrylic test section to a stainless steel spool. This is common in food and beverage pilot plants, water treatment labs, and chemical R and D centers.
But a lab setup is not the same as a process line. In a physics lab, the operator changes the flow rate by hand and writes down the numbers. In a process line, the transmitter must run unattended for months. The lab setup can use clear plastic and manual valves. The process version needs stainless steel, welded impulse lines, and sometimes ATEX Zone 1 or Zone 2 approvals.
Silver Automation Instruments also supplies electromagnetic flowmeters, ultrasonic flowmeters, Coriolis mass flowmeters, vortex flowmeters, oval gear flowmeters, and thermal mass flowmeters for the same loop. Many customers use an electromagnetic flowmeter as the reference meter because it has no moving parts and gives a stable reading for conductive water.
Country and Industry Examples
We have quoted similar systems for a technical college in Manila, a water quality lab in Ho Chi Minh City, and a food process training center in Guadalajara. The requests usually ask for DN25, 0 to 25 kPa, 4-20 mA HART, and a paperless recorder. Some labs want the Venturi tube made of 304 stainless steel instead of acrylic because the apparatus runs every day for years.
FAQ
What size Venturi or orifice do you recommend for a physics lab?
For most teaching labs, DN25 is a practical size. It fits small pumps and still gives a stable differential pressure.
Can you supply only the differential pressure transmitter and not the primary element?
Yes. We need the pipe size, beta ratio, expected differential pressure range, and whether the fluid is water or air.
Do you supply the data logger or recorder for the lab apparatus?
We supply paperless recorders with 4-20 mA and PT100 inputs. This works well for lab benches that need a local trend display.
What accuracy can a student expect from a Venturi or orifice apparatus?
A well built DN25 Venturi with a 0.1 percent differential pressure transmitter can often stay within 1 percent of the reference flow rate. Orifice plates usually land between 1.5 and 2.5 percent in a basic teaching rig.
What information should we send for a laboratory flow meter quotation?
Send pipe diameter or test section size, fluid type, flow range in m3/h or kg/h, operating temperature in °C, and whether you need the primary element, transmitter, or complete loop.
Contact Silver Automation Instruments for a Lab Apparatus Quotation
Send us your fluid type, pipe size in DN, flow range in m3/h or kg/h, operating temperature in °C, and operating pressure in bar. We can propose a Venturi or orifice setup with a 4-20 mA HART transmitter and a PT100 temperature sensor. Call us at +86-25-68650347, use WhatsApp at +86-25-52155837, or send a WeChat message to +86 15365082610.
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