heavy fuel oil flow meter 100 L/h

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# Oval Gear Flow Meter for Paint: Accuracy, Viscosity Limits, and Maintenance **Quick Answer:** Oval gear flow meters measure paint with ±0.5% accuracy for viscosities from 1 cP to 100,000 cP. They work with solvent-based paints, epoxy coatings, and high-solid inks. For a paint line in Vietnam running 500 kg/h at 50°C, we recommend the OGM-25 with PT100 and 4-20 mA HART output. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range (kg/h or L/min) for a quote. ## Why Oval Gear Meters Work for Paint Paint is thick. It is sticky. It changes viscosity when the temperature shifts. A Coriolis meter can handle it but costs more than many paint manufacturers want to pay. An electromagnetic meter needs conductive fluid. Paint is often non-conductive. Ultrasonic meters struggle with air bubbles in paint. That leaves oval gear flow meters as the practical choice. Most engineers skip this part, but here is the thing: oval gear meters are positive displacement. They trap a fixed volume of fluid between two rotating gears. Every rotation equals a known volume. No slip, no drift. You get real volumetric measurement even when the paint is 50,000 cP. We have seen this on customer sites many times. Last year a paint manufacturer in Southeast Asia installed our OGM-40 on a batch blending line. They were using a Coriolis meter before at USD 4,200 per unit. We replaced it with an oval gear meter at USD 680. The accuracy difference was 0.5% versus 0.3%. The cost savings paid for the installation in two months. ## Viscosity Limits: What Actually Happens The technical spec says oval gear meters work from 1 cP to 100,000 cP. In practice, the lower limit is about 10 cP. Below that, the fluid leaks past the gears. Wa heavy fuel oil flow meter 100 L/h

ter at 1 cP will not drive the meter properly. Paint thinner at 0.7 cP also fails. The upper limit depends on the material of the gears. Standard stainless steel gears handle up to 50,000 cP. We supply tungsten carbide gears for heavy paste paints and mastics up to 100,000 cP. A customer in Brazil asked us for a meter measuring epoxy resin at 85,000 cP at 40°C. We used the OGM-50 with tungsten carbide gears and a heated jacket. The meter held accuracy at 0.4% over six months. ## Temperature and Pressure: What You Need to Specify Paint lines run at different conditions. Here are the common ranges we see: | Parameter | Typical Range | Silver Instruments OGM Capability | |-----------|---------------|-----------------------------------| | Temperature | 10°C to 80°C | -30°C to 200°C with PT100 RTD | | Pressure | 2 bar to 16 bar | Up to 40 bar (standard), 100 bar (high-pressure variant) | | Pipe size | DN15 to DN80 | DN15 to DN200 | For solvent-based paint at 60°C and 10 bar, use the OGM-25 with PTFE seals and 4-20 mA HART. The standard seals are Viton. For ketone solvents, use EPDM. ## Real Installation: Paint Blending Line in Thailand A paint blender in Rayong, Thailand runs 12 different base colors. Each base has a different viscosity. The line mixes solvent, resin, pigment, and additives in sequence. They installed our OGM-15 meters on each ingredient line. The flow range is 10 L/min to 80 L/min. Viscosity varies from 20 cP for solvent to 12,000 cP for pigment paste. The oval gear meters with pulse output connect to a PLC for batch control. The maintenance schedule is every 6 months. They change the O-rings and inspect the gears. In 18 months, no gear failure. The accuracy stayed within 0.5%. ## Maintenance: Wha

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