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『100 GPM Hydraulic Flow Meter: Heavy-Duty Oil System Fluid Power Testers』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)
100 GPM Hydraulic Flow Meter for Heavy Duty Oil System Fluid Power Testers
Quick Answer
For a 100 GPM hydraulic flow meter on heavy duty oil systems, select an oval gear or turbine meter with a 420 bar pressure rating, 4-20 mA HART output, and local rate display. Silver Instruments supplies calibrated meters for hydraulic test benches, pump test rigs, and power unit monitoring. For standard mineral oil test benches, Model OG100-DN50-420 covers 100 GPM with 420 bar static pressure.
Why 100 GPM Is a Common Test Bench Range
Hydraulic repair shops and OEM test benches in Southeast Asia, Australia, and the Middle East often run pumps at 50 to 100 GPM. At 100 GPM the meter sees about 378.5 L/min. This flow range covers most mobile hydraulic pumps and large industrial power units.
Most engineers skip this part. The flow meter must survive rapid valve shifts and pressure spikes. A standard plastic rotameter will not last. You need a metal body meter with high pressure seals and a clear pulse output.
We have seen this on customer sites many times. A test bench in Malaysia was using a paddle wheel meter for ISO VG 46 hydraulic oil. The shaft seal leaked after two months because the meter was not rated for 220 bar pressure spikes. Silver Instruments replaced it with a 2 inch oval gear meter with a 420 bar rating.
Oval Gear vs Turbine Meter for 100 GPM Oil Flow
For heavy duty oil systems, two meter types cover most 100 GPM jobs. Oval gear positive displacement meters handle viscosity from 5 cP to over 1000 cP. They do not need long straight pipe runs. They give repeatability of 0.1 percent of rate and accuracy of 0.5 percent of reading after calibration.
Turbine meters work well with low viscosity hydraulic oils such as ISO VG 32. They are lighter and cost less in larger line sizes. The tradeoff is that turbine meters need 10D upstream and 5D downstream straight pipe. Turbine bearings can also wear when the oil is dirty or when flow starts and stops often.
For fluid power testers, we recommend an oval gear flow meter with aluminum or stainless steel housing, PTFE seals, and hardened gears. A DN50 or 2 inch body is common for 100 GPM continuous flow. A DN40 body can handle 100 GPM intermittent flow with a higher pressure drop.
Pressure, Temperature, and Oil Viscosity Limits
A heavy duty hydraulic flow meter should handle at least 420 bar static pressure and 150 °C fluid temperature. The output signal must stay stable even when oil temperature moves from 35 °C to 70 °C during a pump test.
Use a meter with a built in PT100 temperature sensor if your test bench logs temperature and flow together. The 4-20 mA HART output can carry flow rate, total, and temperature data to a PLC or data recorder. Many units also include a pulse output for a frequency input card.
In practice, set the calibration oil viscosity at 40 cSt or 46 cSt for standard hydraulic oil. If you test with ISO VG 68 or heavy gear oil, tell us the viscosity before calibration. The meter curve shifts when viscosity changes. Silver Instruments calibrates each 100 GPM meter with a NIST traceable positive dis
Installation on Fluid Power Testers
Mount the meter on a bypass line with a strainer upstream. Use a check valve downstream if the test bench reverses flow. For oval gear meters, straight pipe runs are not critical. For turbine meters, keep 10D upstream and 5D downstream.
Do not start a test bench with the meter isolated. Trapped air can spin an oval gear meter fast and damage the gears. Use an air eliminator or vent the piping before the first run of the day.
If the hydraulic system uses phosphate ester or water glycol fluid, choose a meter with stainless steel internals and Viton seals. Standard aluminum with PTFE seals works for mineral oil but can fail with aggressive fluids.
Outputs and Calibration Certificate
Silver Instruments offers 100 GPM hydraulic flow meters with 4-20 mA HART, pulse, RS485 Modbus RTU, and two relay outputs. The local display shows rate in GPM or L/min and total in gallons or liters. You can change units from the front keypad.
Each meter ships with a 5 point calibration certificate. We record flow points at 10, 25, 50, 75, and 100 GPM. The certificate shows deviation at each point. Most customers in Australia and Saudi Arabia use the certificate for ISO 9001 audit records.
FAQ
Can a 100 GPM hydraulic flow meter handle bidirectional flow on a test bench? Yes if the oval gear meter has bidirectional gears and a dual pulse output. Ask for bidirectional calibration when you send your request.
What is the minimum viscosity for a 100 GPM oval gear meter? The minimum viscosity is around 1 cP for short runs. Below that, internal leakage reduces accuracy. For diesel or kerosene test rigs, we recommend a turbine meter instead.
Can the meter signal connect to a PLC? Yes. Use the 4-20 mA HART or pulse output. The pulse output gives every 0.1 gallon or 0.1 liter as a square wave. No special converter is needed for most Rockwell or Siemens input cards.
What is the typical price for a 100 GPM hydraulic flow meter? Price depends on body material, pressure rating, outputs, and optional approvals. Send your required flow range and oil type. Silver Automation Instruments will return a fixed quotation with a datasheet and test certificate.
What is the typical lead time for a 100 GPM hydraulic flow meter? Standard aluminum body oval gear meters ship from stock in 7 to 10 days. Stainless steel body or ATEX Zone 1 versions take about 3 to 4 weeks. We ship to Australia, New Zealand, Vietnam, Indonesia, Mexico, Chile, Saudi Arabia, and South Africa by DHL or sea freight.
Get a Matching Quotation
Send us your pressure in bar, temperature in °C, pipe size in DN or inches, and flow range in GPM or L/min. Silver Automation Instruments will reply with a datasheet, test certificate, and fixed price for the 100 GPM hydraulic flow meter.
Telephone: +86-135-1213-1526
Whatsapp: 86-135-12131526
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Ask about our oval gear flow meter for diesel and hydraulic oil test benches.