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Oil Flow Meter 100C: Reliable Performance for Standard Thermal Loop Lines
Quick Answer: The Oil Flow Meter 100C measures heat transfer oil in closed loops from -20 °C to 350 °C with no straight pipe requirement. It holds ±0.5 % accuracy across a viscosity range from 5 cP to over 2,000 cP. Silver Automation Instruments keeps DN25 and DN50 models in stock for fast dispatch to Australia, Southeast Asia, and the Middle East.
Here is the thing about thermal oil loops. At 6 am, the oil sits at 40 °C and flows like thick honey. Thirty minutes later it hits 260 °C and thins out like water. A flow meter that drifts during this ramp-up creates bad batches and heats up disputes with the boiler room. The 100C oval gear meter is purpose designed to hold its numbers through the whole warm up curve.
Why Oval Gear Meters Dominate Thermal Oil Loops
Positive displacement meters measure volume pocket by pocket. Each turn of the oval gears traps a fixed quantity of fluid and pushes it forward. This working principle stays accurate when viscosity swings from 5 cP at 250 °C to 800 cP at 60 °C during a cold start. Turbine meters and vortex meters lose their curve below 30 cP. In practice, a textile finishing plant in Surabaya, Indonesia replaced a turbine meter with a 100C and saw batch repeatability tighten from 1.8 % to 0.3 %. Their stenters now receive a steady heat supply, and the shift supervisor checks the totalizer only once per day.
Because the 100C needs zero straight pipe, you can mount it right after a 90 degree elbow, a strainer, or a hose connection. This saves up to 1.2 meters of piping real estate compared to a turbine or Coriolis meter. The housing is cast steel with hard chrome plated rotors. Wetted parts are fully compatible with mineral based thermal oils, synthetic fluids like Therminol, and hot water glycol blends. Maximum working pressure is 40 bar at 250 °C, derated to 25 bar at 350 °C. Flange connections follow ASME B16.5 150 lb or DIN PN16 patterns, with NPT threads on the smaller DN15 and DN20 bodies.
Thermal Loop Applications Across Four Countries
The 100C appears in standard industrial loops that are not exotic but are brutally repetitive. In Vietnam, plywood hot press lines use one meter per press to prove the heating circuit flow before every cycle. In Saudi Arabia, a bitumen storage terminal tracks heat consumption across twelve trace heated headers with a single meter per loop. A food ingredients plant in Thailand measures hot soybean oil at 180 °C inside a deodorization column. An asphalt plant in Melbourne, Australia monitors the thermal oil supply to its bitumen spray bars with a DN40 100C. All these sites share one requirement: a meter that does not drift when the oil temperature swings 60 °C in ten minutes.
Output Signals and Hazardous Area Approval
Standard electronics supply a 4-20 mA HART signal plus a scaled pulse output. The local LCD alternates between flow rate in kg/h or L/min and a non resettable total. For tanks and headers located in ATEX Zone 1 or Zone 2, Silver Instruments can deliver the 100C with Ex ia IIC T4 certification and a pair of intrinsic safety barriers. A chemical plant in Abu Dhabi ordered
Four Details Most Engineers Check Before They Buy
First, the bearing design. The 100C uses tungsten carbide journal bearings with carbon graphite bushes. These survive dry running during commissioning and do not swell in aromatic heat transfer fluids. Second, the pulse resolution. At DN25 the K factor is 200 pulses per liter, fine enough to dose 20 litres of thermal oil into a mixing vessel with 0.5 % volume accuracy. Third, the filter requirement. A 200 micron Y strainer installed upstream is mandatory. Most plants already have a 300 micron strainer protecting their gear pump, so the meter drops into an existing port without extra hardware. Fourth, the pressure drop. At 60 L/min and oil viscosity of 400 cP, the pressure loss is below 0.35 bar. That keeps pump sizing simple and avoids cavitation when the loop runs at 3 bar g suction pressure.
FAQ: Five Questions Engineers Ask Before They Order
Q: Can the 100C measure thermal oil at 320 °C continuously without drift? A: Yes. The register and sensor are separated from the body by a thermal extension neck. We have meters running in a Spanish solar thermal plant at 330 °C since 2021 with less than 0.2 % drift each year.
Q: Is the meter suitable for high sulfur heat transfer oil? A: Standard PPS rotors and HNBR O rings are fine for low sulfur content. For oils with more than 2 % sulfur, we recommend FKM O rings and 316 stainless rotors. Just include the total sulfur percentage in your enquiry.
Q: What happens if the oil solidifies inside the meter? A: The oval gears can lock. Install a trace heating cable on the meter body if your plant ambient drops below the oil pour point. The body has a ½ inch NPT port for a PT100 probe, so you can interlock the pump start with skin temperature.
Q: Do I need a flow straightener upstream? A: No. Oval gear meters are immune to flow profile distortion. You can place the 100C directly after a modulating butterfly valve with zero straight run. This is a major reason facilities choose it over turbine and ultrasonic meters.
Q: Can Silver Instruments calibrate the meter with our actual thermal oil? A: Yes. Send us a 15 litre sample of your real heat transfer fluid. We measure its viscosity curve at your operating temperatures and calibrate the meter on that same oil. This service adds four working days and costs AUD 380 per meter. It is worth the effort for high value chemical batches.
How to Get a Quote That Matches Your Loop
Send us your maximum oil temperature, working pressure in bar, pipe size DN, and the flow range in kg/h or L/min. If you use a branded heat transfer fluid like Therminol 66 or Duratherm S, mention that too. We ship from our Singapore hub to Australia, Vietnam, Thailand, Indonesia, Chile, and the UAE. Standard DN25 and DN50 meters leave the warehouse inside 14 days. Visit the flow meter site at flow-meter.com.au or email our sales desk for a data sheet and a fixed price with freight included.