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Hedland Flow Meter Catalog PDF Library: Accessing Operational Limits for Variable Area Sensors
Quick Answer: The Hedland flow meter catalog PDF library gives pressure, temperature, viscosity and flow range limits for variable area sensors. Silver Automation Instruments keeps a technical reference set for common Hedland model families used in oil, water, chemical and gas service. Send your pipe size in DN, flow range, fluid and operating pressure to get the right PDF data for your process.
Engineers and maintenance teams often ask us for Hedland flow meter PDF files before they select a variable area meter. They need the operational limits for variable area sensors, not just product photos. In practice, this means the pressure drop curve, the maximum oil viscosity and the wetted material for each model. We have seen several customer sites in Vietnam and Indonesia where a simple PDF check prevented a brass meter from being installed on seawater.
What the Catalog PDF Library Covers
Hedland style variable area sensors appear in hydraulic power units, skid systems, fuel oil loops and cooling water circuits. The catalog PDFs for these meters cover flow ranges from about 0.02 to 150 GPM depending on port size. Pressure limits vary by material. Aluminum and brass bodies often rate to 240 bar. Stainless steel bodies can go higher, up to 420 bar on some direct reading models.
Temperature limits matter just as much as pressure. Standard Hedland variable area sensors handle minus 29 to 116 degrees Celsius. Some high temperature versions reach 160 degrees Celsius. If your fluid sits at 120 degrees Celsius, the standard seal and window may fail. That is why we always ask for both operating and maximum upset temperature.
For remote reading, some Hedland variable area sensors come with a 4-20 mA HART output. This helps when the meter sits inside an ATEX Zone 1 skid. The PDF library includes wiring notes for the transmitter option. Pair the meter with a PT100 probe if you need temperature compensation at the same point.
Operational Limits for Variable Area Sensors
Here is the thing. A variable area sensor looks simple, but its accuracy depends on viscosity, density and pipe orientation. Most Hedland model families list accuracy at plus or minus 2 percent of full scale. Repeatability is usually plus or minus 1 percent. These numbers apply to clean liquids with a stable viscosity, not to slurries or flashing liquids.
Viscosity changes shift the float position. Hedland catalog PDFs often include viscosity correction tables for oil from 40 to 240 cSt. Water based fluids usually need no correction between 0.5 and 5 cP. A customer in the Philippines asked us last year why his meter was reading 15 percent low on diesel. The issue was not the meter. He was using a water based calibration sheet instead of the diesel section in the PDF library.
Pressure drop is another limit engineers skip. A 1 inch Hedland type meter at full flow can drop between 0.3 and 0.8 bar depending on oil viscosity. On suction lines, this can cause pump cavitation. On return lines, it may raise backpressure enough to damage seals. We recommend keeping the meter on the discharge line when pressure drop is above 0.3 bar.
Port Sizes, Flow Ranges and Materials
Hedland catalog PDFs usually group variable area sensors by port size. Typical sizes are 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch, 1.5 inch, 2 inch and 3 inch. In DN terms, this covers DN8, DN10, DN15, DN20, DN25, DN40, DN50 and DN80. A DN15 meter may cover 0.1 to 8 L/min for water. A DN50 meter can handle 20 to 400 L/min for hydraulic oil depending on the model.
Common wetted materials include aluminum, brass, 316 stainless steel and PTFE seals. For seawater or brackish water, we suggest 316 stainless steel with FKM or PTFE seals. For glycol cooling water, brass is often acceptable. For phosphate ester hydraulic fluid, so
How We Use the PDF Library for Quotes
Silver Automation Instruments supplies variable area flow meters for replacement and new equipment. When you send us an old Hedland part number, we first check the PDF library for the flow range and pressure limit. Then we confirm the thread type, because NPT, SAE and BSPP threads all appear on the same body size. A customer in Nigeria needed a replacement meter for a hydraulic test bench. The original part was a 1/2 inch NPT aluminum model. We sourced a stainless steel version because the test fluid contained water.
We can also provide a complete PDF set by email after you tell us the model number, fluid, pipe size and flow range. We do not charge for this.
Common Mistakes with Variable Area Sensor Installation
Most engineers skip the part about flow direction. Hedland type variable area sensors are not bidirectional. The flow arrow on the body must match the pipe flow. Installing the meter backwards will not usually break it, but it will give a false reading.
Vertical piping can also cause trouble. Spring loaded variable area meters can work in any position, but gravity influenced models may need vertical upward flow. Check the catalog PDF for mounting orientation. If the float sticks, you probably have a viscosity or contamination issue, not a mechanical fault.
We have seen a paint manufacturer in Southeast Asia install a brass variable area meter on solvent with a high acetone content. The seal degraded within two months. The PDF library material table showed PTFE required for that solvent. This one page saved them from another shutdown later.
Relationship Between Hedland Type Meters and Silver Instruments
Silver Instruments is not the Hedland factory. We are an industrial flow meter manufacturer and supplier in China with a deep reference library for Hedland style variable area sensors. Many distributors in Southeast Asia, Latin America and the Middle East ask us for cross parts. We keep dimensional drawings and operational limit tables for common model families so you can compare pressure, temperature, material and port size before you commit.
FAQ
Where can I download the Hedland flow meter catalog PDF library?
You can request the PDF files directly from Silver Automation Instruments. Send us your model number or your pipe size and fluid type. We will email the relevant catalog sheet in English, Spanish or Portuguese. Our library includes pressure limits, temperature ranges, viscosity curves and dimensions.
What is the maximum pressure for a Hedland variable area sensor?
It depends on the body material. Many aluminum and brass models are rated to 240 bar. Stainless steel models can run up to 420 bar. Always check the model code against the PDF library, because the pressure limit drops at high temperature.
Can I use a Hedland type variable area meter on diesel fuel?
Yes, diesel fuel is a common application. Use a meter with stainless steel internals or aluminum with Buna N seals. The PDF library has viscosity correction tables for diesel. These tables keep accuracy within 2 percent full scale.
Does pipe orientation affect the reading?
Yes. Some variable area sensors need vertical upward flow. Spring loaded models are less sensitive. The catalog PDF will show the expected mounting orientation. Always look at the arrow on the meter body.
How do I get a quote from Silver Instruments?
Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, flow range in L/min or GPM, and the fluid type. Add the old Hedland part number if you have one. We respond within 24 hours. Call +86-25-68650347 or WhatsApp +86-25-52155837. For WeChat, use +86 15365082610. You can also visit flow-meter.com.au for more details.
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