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『Flow Meter and Pressure Gauge Combos: Dual-Parameter Monitoring for Hydraulic Loops』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Flow Meter and Pressure Gauge Combos: Dual-Parameter Monitoring for Hydraulic Loops
Quick Answer: A flow meter and pressure gauge combo gives hydraulic loop operators two live signals in one panel. Silver Automation Instruments supplies DN15 to DN50 oval gear flow meters and 0-400 bar pressure transmitters with 4-20 mA HART outputs. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in L/min. We will recommend one flow meter model and one pressure transmitter range.
Hydraulic loops do not forgive guesswork. A pump may deliver the right flow while pressure falls at a loaded cylinder. Or pressure stays normal while flow drops because of internal leakage. One signal alone will miss both faults.
What the Combo Replaces on a Hydraulic Loop
Most maintenance teams use a pressure gauge on the manifold and a service flow meter only during audits. That leaves long gaps between checks. A permanent flow meter and pressure transmitter close that gap. The two 4-20 mA signals go to a PLC or a Silver Automation Instruments paperless recorder. The operator sees flow in L/min and pressure in bar on the same screen. Alarms trigger when either value leaves the band.
Here is the thing. Hydraulic oil viscosity changes with temperature. A flow meter without temperature compensation drifts. A pressure spike can also damage a mechanical gauge. This is why we pair oval gear flow meters with PT100 temperature compensation and pressure transmitters rated well above the working pressure.
Flow Meter and Pressure Gauge Pairings We Ship Most
For small hydraulic power units under 40 L/min, use a DN15 oval gear flow meter and a 0-250 bar pressure transmitter. This covers most clamping circuits and lubrication loops.
For test stands and directional valve rigs up to 120 L/min, use a DN25 or DN32 oval gear flow meter and a 0-400 bar pressure transmitter. Choose 4-20 mA HART output if the PLC is far from the skid.
For water glycol or low viscosity hydraulic fluids, an electromagnetic flow meter works when conductivity is above 5 µS/cm. Use a DN20 electromagnetic flow meter and a 0-160 bar pressure transmitter. For oil, do not use electromagnetic. Use oval gear or a Coriolis mass flow meter if you also want kg/h mass flow and density trend.
Field Notes from Southeast Asia and the Middle East
A paint manufacturer in Southeast Asia asked us to monitor hydraulic oil flow on a filling line. The loop ran at 32 L/min and 120 bar. They installed a DN20 oval gear flow meter and a 0-250 bar pressure transmitter. The two signals went to a local display. Shift supervisors now catch filter clogging before it slows the machine.
Last year a customer in Vietnam asked us for a skid mounted flow and pressure loop for a hydraulic test bench. The fluid was hydraulic oil with viscosity around 46 cSt. We supplied a DN25 oval
In the Middle East we see more oil and gas hydraulic power units. The ambient temperature is high. Pressure transmitters with 0-400 bar range and wide temperature compensation avoid zero drift between day and night shifts.
Why Buy Flow and Pressure as One Package
Buying from one supplier reduces wiring and calibration mismatch. We configure both instruments at the factory. The flow meter and pressure transmitter use the same 24 V DC loop supply. We can wire both to one Silver Automation Instruments paperless recorder for a local trend view. You get one test report and one shipping document.
Most engineers skip this part. A flow meter alone tells you volume. A pressure gauge alone tells you force. Combined data tells you if a cylinder is bypassing internally. The pressure drop across a valve plus the flow reading shows energy loss in real time.
FAQ: Five Questions from Hydraulic Loop Buyers
Question 1: What flow meter works with hydraulic oil at 200 bar?
Use an oval gear positive displacement flow meter in DN15 to DN40. Body material is cast iron or stainless steel. The pressure rating is usually 250 bar or 400 bar depending on the model. Silver Automation Instruments supplies both options.
Question 2: Can you combine flow and pressure signals in one display?
Yes. We can wire both 4-20 mA signals to a Silver Automation Instruments paperless recorder or a local digital indicator. The display shows flow in L/min and pressure in bar at the same time.
Question 3: Does the pressure transmitter need ATEX certification for a hydraulic skid?
Not always. If the skid sits in a safe area, standard transmitters work. If the hydraulic power unit is near a gas compressor or solvent area, choose ATEX Zone 1 or Zone 2 transmitters. Send us the area classification and we will quote the correct model.
Question 4: What accuracy can we expect?
Oval gear flow meters from Silver Automation Instruments typically give ±0.5 percent of reading for hydraulic oil above 10 cP viscosity. Pressure transmitters give ±0.25 percent full scale or better. We calibrate both before shipping.
Question 5: How do we send the right specifications for a quote?
Send us the pressure in bar, temperature in °C, pipe size in DN, flow range in L/min, fluid type, and power supply. We will reply with one part number for the flow meter and one for the pressure transmitter.
Request a quote from Silver Automation Instruments. Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526. Or visit flow-meter.com.au for flow meter and pressure transmitter datasheets.