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Hydraulic Flow Meter Gauge: Analog Dial and Digital Oil Pressure Indicators
Quick Answer
Silver Automation Instruments supplies hydraulic flow meter gauges with analog dial readouts and digital oil pressure indicators for hydraulic power units, test benches, and mobile machinery. The analog dial models read flow without any power supply. The digital transmitters output 4-20 mA with HART to your PLC. Send us your oil viscosity, working pressure in bar, pipe diameter (DN), and flow range for a same-day selection.
Analog Dial Flow Meters for Hydraulic Oil
A mechanical analog dial flow gauge uses an oval gear measuring element. The rotating gears drive a magnetic coupling that moves a pointer across the dial. This design needs no battery, no loop power. We see these on construction equipment in Malaysia, where service technicians check hydraulic oil flow without opening a control cabinet. The oval gear type handles oil viscosity from 10 to 1000 cSt. That covers most mineral oils, synthetic esters, and even some fire-resistant fluids. Typical line sizes are DN6, DN10, DN15, DN20, and DN25. The aluminum body version holds up to 250 bar. A ductile iron body pushes the rating to 400 bar. Accuracy sits at plus minus 1.0 percent of reading. That is enough for preventive maintenance on an injection molding machine or a large hydraulic press. A clear glass window on the dial lets an operator spot flow surges instantly. No signal converter is needed. The direct reading saves troubleshooting time on the shop floor.
Digital Oil Pressure Indicators with HART Protocol
On the same hydraulic line, you often need pressure data. Our digital oil pressure indicators pair a thin-film sensor with a bright LED display. The standard output is 4-20 mA with HART protocol. This talks directly to a Siemens S7-1200 or Allen-Bradley CompactLogix PLC. Ranges cover 0-10 bar up to 0-600 bar. Burst pressure is at least three times the rated range. The wetted parts are 316L stainless steel. This resists aggressive hydraulic oils that contain ester or water-glycol base stocks. ATEX Zone 1 certification is available for offshore platforms in Qatar or Brazil. The transmitter has two PNP switch outputs. A plant engineer can set alarm thresholds with the onboard menu, no handheld programmer needed. That cuts commissioning time on a new hydraulic power pack.
Combined Flow and Pressure Monitoring on One Panel
Many customers order a set of flow gauge and digital pressure indicator to mount side by side on a hydraulic test bench. A pump manufacturer in Vietnam uses a DN15 oval gear flow meter with an analog dial next to a 0-400 bar digital pressure indicator. The operator reads flow in L/min from the pointer and pressure in bar from the LED. The pressure transmitter also sends a 4-20 mA signal to a paperless recorder for quality traceability. Silver Instruments supplies both devices pre-mounted on a stainless steel bracket. The kit arrives ready to install. This saves assembly hours at the customer plant. You get analog direct reading and digital data logging in the same panel cutout.
Where These Instruments Work in the Real World
We ship these hydraulic instrum
Why Source from Silver Automation Instruments
We carry full stock of oval gear flow meters and pressure transmitters in our Nanjing warehouse. We ship small batches, sometimes just two or three pieces, to end users and distributors. Our prices are direct from the manufacturer. Calibration certificates are traceable to Chinese national standards, and we include them at no extra cost. Need a custom thread? We machine BSPP, NPT, or SAE flange connections within 5 working days. Tell us your media, and we check seal compatibility for free. Contact us on WhatsApp at 86-135-12131526 or call +86-135-1213-1526. You can also reach sales on WeChat at +86 13512131526.
Frequently Asked Questions
Do analog dial flow meters need external power?
No. The oval gear movement drives a magnetic coupling to the analog pointer. The meter works without any battery or loop power. This makes it ideal for remote hydraulic systems on excavators, crane outriggers, or ship winches where wiring is not practical.
What is the maximum pressure rating for a digital oil pressure indicator?
Standard sensors go up to 600 bar. We also supply 1000 bar versions for ultra-high-pressure hydraulic tools. The wetted material is 316L stainless steel, and the pressure port is usually G1/4 male. The burst pressure is at least three times the rated range.
Can I measure flow of phosphate ester fire-resistant hydraulic fluid?
Yes, please specify the fluid type when you order. We can swap the standard FKM seals for EPDM or PTFE seals. The oval gear material remains hardened steel or cast iron. A chemical compatibility check is free. Just send us the fluid data sheet with your inquiry.
Do you provide ATEX Zone 1 certification for hydraulic flow meters?
We offer ATEX II 2G Ex db IIB T4 certification on the oval gear flow meters with mechanical analog register. The digital pressure indicator also has ATEX and IECEx versions. Please indicate the zone and gas group with your order, and we will prepare the correct certificate pack.
How do I get a price for a customized flow meter and pressure indicator set?
Send us your pressure in bar, temperature in degrees C, pipe size (DN), and flow range. Also tell us the oil type and viscosity. Our application engineer checks the data and sends a quotation within 24 hours. Contact us on WhatsApp 86-135-12131526 or leave your details on our website flow-meter.com.au.