『High Pressure Liquid Flow Meter Options: Positive Displacement Spur Gear Transmitters for Hydraulics』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
High Pressure Liquid Flow Meter Options: Positive Displacement Spur Gear Transmitters for Hydraulics
Quick Answer: For hydraulic oil and high pressure liquid measurement above 100 bar, a positive displacement spur gear flow transmitter is often the most practical option. Silver Instruments supplies spur gear transmitters rated up to 400 bar with 4-20 mA HART output, accuracy around ±0.5 percent of reading, and optional ATEX Zone 1 certification. Send your pressure in bar, temperature in °C, pipe size DN, and flow range for a direct quote.
Why Hydraulic Systems Need Positive Displacement Spur Gear Meters
Hydraulic circuits run at pressure and flow rates that can confuse other meter types. Turbine meters lose accuracy at low flow and high viscosity. Magnetic flow meters do not work with hydraulic oil. Positive displacement spur gear transmitters measure actual volume per revolution. They give repeatable output from 0.02 l/min to 80 l/min depending on size. In practice, this is why test bench builders and hydraulic power unit OEMs choose spur gear meters.
High Pressure Ratings in Real Applications
We have seen customer sites where standard gear meters failed because pressure spikes exceeded 250 bar. A spur gear transmitter for hydraulics should have a metal body, not plastic. Silver Instruments supplies stainless steel 316L bodies with hardened steel gears. Pressure ratings cover 250 bar, 400 bar, and 630 bar depending on the port style. Temperature ratings go up to 150 °C. Seals are available in FKM for mineral oil and EPDM for phosphate ester fluids.
Output Signals for Hydraulic Control Systems
Most hydraulic monitoring loops use 4-20 mA HART. This signal travels long distances and gives you temperature and flow data from one transmitter. For local PLC counting, a pulse or frequency output works better. Some Silver Instruments spur gear transmitters include a local display. Specify the connector type early. M12 and DIN 43650 connectors are common in Southeast Asia and Oceania.
Sizing and Viscosity Notes
Here is the thing. Hydraulic oil viscosity changes a lot between cold start and normal running. You may see 800 cP at 15 °C and then 40 cP at 60 °C. A positive displacement spur gear meter has a small shift across that range. But you still need to tell us the actual viscosity. We calibrate each transmitter for the expected fluid. Last year a customer in Vietnam replaced a turbine meter with a spur gear transmitter on a hydraulic test bench. The turbine meter gave unstable readings at 8 l/min. The spur gear unit held steady within ±0.5 percent of read
Installation and Mechanical Details
Install a filter upstream of the meter. Hydraulic systems often carry wear particles. Positive displacement meters do not need long straight pipe runs. You can mount them on pressure lines or return lines. For high pressure lines, choose SAE O-ring boss or BSPP ports. Avoid pipe strain. A rigid bracket helps. Most engineers skip this part and then see drift at high pressure.
Silver Instruments High Pressure Spur Gear Transmitters
Silver Automation Instruments supplies positive displacement spur gear transmitters for hydraulic oil, diesel fuel, lube oil, and other high pressure liquids. We work with industrial users and distributors in Vietnam, Malaysia, Thailand, Indonesia, Mexico, Chile, Saudi Arabia, and South Africa. Standard body material is stainless steel 316L. Flow ranges cover 0.02 l/min to 80 l/min. Pressure ratings up to 400 bar are common. Higher pressure options are available on request. Accuracy is ±0.5 percent of reading for most spans. ATEX Zone 1 certification is available for hazardous area use. See flow-meter.com.au for the full high pressure liquid flow meter range.
To get a quote, send us your pressure in bar, temperature in °C, pipe size DN, and flow range. Contact Silver Instruments by Tel at +86-25-68650347 or WhatsApp at +86-25-52155837. You can also reach us on WeChat at +86 15365082610.
Frequently Asked Questions
What is the maximum pressure for a spur gear flow transmitter?
Standard Silver Instruments spur gear transmitters are rated to 400 bar. We can supply 630 bar versions for special hydraulic test rigs. Always include pressure spikes in your specified value.
Can spur gear flow meters measure high viscosity hydraulic oil?
Yes. Positive displacement spur gear meters handle viscosities from 10 cP to over 1000 cP. We calibrate to your actual fluid viscosity to keep accuracy stable.
What output signal is best for hydraulic system monitoring?
4-20 mA HART is common for long signal runs and remote monitoring. Pulse or frequency output works well for PLC counting and local hydraulic power units.
Are Silver Instruments spur gear transmitters ATEX certified?
Yes. ATEX Zone 1 certification is available for hazardous area installations. Specify the zone and gas group when you send your inquiry.
How do I order a high pressure spur gear flow meter?
Send us your pressure in bar, temperature in °C, pipe size DN, and flow range. Add your fluid type and output signal. We reply with a quote and recommended model within one business day.
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