『20 G/H Flow Meter Micro-Dosing System Configurations』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
20 g/h Flow Meter Micro-Dosing System Configurations
Quick Answer
A 20 g/h micro-dosing system needs a Coriolis mass flow meter with a tube inner diameter below 1.5 mm. Silver Instruments’ CMF-010 measures down to 0.02 kg/h with ±0.2% accuracy. Pair it with a dedicated micro-dosing controller and a back-pressure regulator to keep the dosing stable at such low rates.
The CMF-010 sensor uses a dual bent-tube design with 1.0 mm ID tubing. It resolves flow steps as small as 0.01 g. In practice, most engineers skip this part, but the sensor excitation frequency reaches 800 Hz on this tiny tube. That high frequency gives a clean phase shift even at 20 g/h of liquid with a density of 0.8 g/cm³.
The transmitter is a remote mount unit with 4-20 mA HART, Modbus RTU, and pulse output. Silver Instruments ships it with a factory-characterized calibration report for 0.02–20 kg/h range on a reference fluid at 25 °C. The linearity over 10:1 turndown stays within ±0.1%. One common mistake is ignoring the pressure drop across the meter. At 20 g/h and 10 cP viscosity, the CMF-010 adds about 0.15 bar pressure drop. If your supply pressure is less than 0.5 bar, you will struggle to hit the setpoint.
For a complete micro-dosing loop, you need a few more components. A stainless steel syringe pump or a gear pump with a stepper motor drive provides the motive flow. A back-pressure relief valve set to 1.5 bar keeps the sensor flooded and prevents cavitation. A mass flow controller or PLC reads the flow meter’s 4-20 mA signal and compares it to the recipe. Silver Instruments often suggests the SAI-2100A batch controller. It accepts up to three flow meter inputs and can drive a stepper motor via pulse commands.
We have seen this on customer sites many times. A paint manufacturer in Vietnam runs a 20 g/h dosing line for metallic pigment additive into a urethane base. They use the CMF-010 with a gear pump and a simple PID loop in a Siemens S7-1200 PLC. The dosing accuracy is ±0.05 g over a 5-minute batch. Another project in Thailand doses a lemon flavor emulsion at 18 g/h into a beverage mixing tank. The Food Grade certificate and 316L wetted parts of the CMF-010 met the local FDA requirements without extra paperwork.
Because
When you configure the zero calibration, run it with the process liquid, not with water. I have seen zero offsets change by 0.02 kg/h just from switching from water to a solvent with lower conductivity. The CMF-010 transmitter has an auto-zero function that you can trigger via Modbus. Run it at operating temperature and pressure. That simple step saves a lot of batch rejects in the first week.
FAQ
What flow meter technologies work for 20 g/h micro-dosing?
Only a Coriolis mass flow meter with a small tube ID can measure 20 g/h directly. Thermal mass flow meters drift too much at such low liquid flows. Oval gear meters usually have a minimum flow of 1 L/h or more. The CMF-010 from Silver Instruments is purpose-built for 0.02–20 kg/h.
Can I use a peristaltic pump with the CMF-010?
Yes, but the pulsation disturbs the Coriolis signal. Add a pulse damper and increase the transmitter’s damping to 2 seconds. A stepper-driven syringe pump gives smoother results.
What output signal works best for a PLC?
Modbus RTU gives the fastest update, about 100 ms per reading. 4-20 mA HART is reliable for long cable runs. The pulse output with a scaling of 1000 pulses per gram works well for totalization in a high-speed counter card.
Does the CMF-010 need recalibration often?
Not if the fluid is clean and non-coating. We recommend a zero check once a month. Full calibration once a year. Silver Instruments offers a fixed-price calibration service for Southeast Asian customers, with turnaround in 5 working days.
How do I get a price for the 20 g/h micro-dosing system?
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Tell us the fluid name and viscosity. We will return a quote for the CMF-010, SAI-2100A controller, and recommended pump within one business day.
Hot Product
Related AD
