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5 g/h Mass Flow Sensor Stability Limits: What Engineers Need to Know
Quick Answer: A mass flow sensor that must read 5 grams per hour needs zero stability better than 0.05 g/h and a signal-to-noise ratio high enough to reject ambient vibration. A miniature Coriolis meter with rigid tube geometry and fast temperature compensation delivers stable 5 g/h readings for chemical additive dosing and pilot plants. Silver Instruments ML-series meters tested with water hold within ±0.1 g/h stability over 15 minutes.
Why 5 g/h Stability Matters in Low-Flow Dosing
Additive injection in paint, food, and specialty chemicals often drops below 10 grams per hour. A polyurethane foam plant in Dubai doses a tin catalyst at 6 g/h into a mixing head. If the sensor zero drifts by 0.3 g/h, foam density shifts and causes off-spec product. Here is the thing: many Coriolis meters under DN3 lose zero stability when ambient temperature swings just 5 °C. We have visited sites where an air conditioning vent blowing on the sensor body created a 0.5 g/h offset. At such low flows the mechanical zero is everything.
Key Parameters That Limit Sensor Stability Below 10 g/h
Zero drift, pipe vibration, and fluid density changes are the three main enemies. At 5 g/h liquid flow the Coriolis tube twist is extremely small. The transmitter must resolve a phase shift measured in microseconds. A PT100 embedded in the tube wall corrects the Young modulus temperature effect, but if the PT100 has Class B accuracy that temperature error alone can mask a 5 g/h signal. You need Class A or better. Viscosity above 200 cP dampens tube oscillation and shrinks the signal amplitude. So, if you are dosing a silicone oil at 5 g/h and 250 cP, the drive power envelope and DSP filter bandwidth must be widened to preserve stability. Back pressure is also crucial; keep at least 0.5 bar above vapour pressure to avoid two-phase noise inside the sensor.
Real-World Example: Paint Additive Dosing in Vietnam
A paint manufacturer in Ho Chi Minh City needed to meter 7 g/h of wetting agent into a high-speed disperser. They first tried a thermal mass flow controller, but the membrane clogged after two weeks with pigment dust. We installed a Silver Instruments ML-C025 Coriolis meter with DN1.6 process connections and 4-20 mA HART output. The zero stability specification for that sensor is 0.03 g/h. We rigged the meter with rigid 1/8 inch stainless steel tubing and a 5 micron inline filter upstream. The flow reading remained within 0.08 g/h for a 10-hour batch, confirmed by a downstream gravimetric scale. The plant manager told us batch rejections dropped from 8 percent to zero in the first month. Because the zero stayed locked, nobody had to adjust the setpoint mid-batch.
How Silver Instruments Tests Stability at 5 g/h
Before shipment, each micro Coriolis meter runs a zero check with the sensor block at 20 °C ±0.1 °C. A calibrated syringe pump pushes filtered water at exactly 5.0 g/h for 15 minutes. The acceptance rule is simple: the
Which Silver Instruments Flow Meter Supports 5 g/h
The Silver Automation Instruments ML-series miniature Coriolis meter covers ranges from 2 g/h up to 5 kg/h. Wetted parts are 316L stainless steel, and Hastelloy C22 is an option for aggressive chemicals. Process connections are 1/8 inch compression fitting or flanged DN2. The transmitter outputs 4-20 mA HART, Modbus RTU on RS485, and a scalable pulse for totalising. You can set the low-flow cutoff at 0.5 g/h. For ATEX Zone 1 areas we supply the explosion-proof housing Ex d IIC T6. Visit flow-meter.com.au and look under Micro Coriolis Series for full specs. The model code for a 5 g/h liquid range is ML-C025-A-316-4H.
FAQ: 5 g/h Mass Flow Sensor Stability Limits
Q: What is the lowest stable flow a Coriolis mass flow sensor can measure?
A: With tight zero stability and rigid pipe mounting, the Silver Instruments ML-series measures liquid flows down to 2 g/h, and we guarantee a stable reading at 5 g/h within an error band of ±0.1 g/h. Below that, environmental noise becomes dominant.
Q: Can a thermal mass flow meter achieve stable 5 g/h measurement for gases?
A: For gases, 5 g/h equals about 2 ln/min for air. Thermal mass meters can handle this range, but they need steady temperature difference control and are sensitive to moisture and dirt. For liquid, you cannot use a thermal meter. A Coriolis sensor works for both phases with unchanged stability.
Q: How does ambient temperature affect sensor stability at flows under 10 g/h?
A: A 1 °C change at the sensor body can shift the zero offset by 0.05 g/h to 0.2 g/h, depending on tube material and PT100 accuracy. Always insulate the sensor, keep it away from direct sunlight and air conditioning drafts, and allow a 30-minute warm-up before taking readings.
Q: What pipe diameter (DN) is needed for stable 5 g/h liquid mass flow measurement?
A: We use tube inner diameters from 0.8 mm to 1.6 mm. Process connections are typically DN2 or 1/8 inch. Small bore keeps fluid velocity high enough to generate a clean Coriolis signal. If your main line is DN15, use a reducer directly at the meter to kill secondary flows.
Q: What details should I send to get a quote for a 5 g/h mass flow meter?
A: Send us your fluid name, viscosity in cP, operating pressure in bar, temperature in °C, pipe size in DN, and the flow range you need in g/h. We will specify the right sensor tube size, O-ring material (FKM, EPDM, or FFKM), and transmitter filter settings. Write to us via the form on flow-meter.com.au or email the data to [email protected].
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