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100 G/H Flow Meter: Coriolis Vibrating Tube Sizing for Micro Flow
Quick Answer: For consistent 100 g/h liquid measurement, a micro Coriolis meter with a DN1 or DN2 vibrating tube is the standard choice. Silver Instruments SMF-M series handles flows from 0.05 kg/h to 500 kg/h, and the twin bent tube design eliminates low-flow stall. You should confirm your process pressure, temperature, and fluid viscosity before picking the final tube size.
Why a Micro Coriolis Flow Meter Suits 100 G/H
Measuring 100 grams per hour is tough for paddle wheels, mini turbines, or thermal mass meters. Vibration, density shifts, and even tiny bubbles create dropouts. A Coriolis meter with small vibrating tubes reads mass flow directly, ignoring volume changes. The SMF-M series uses dual U-shaped tubes with a 2 mm inner diameter. This mechanical design stays active even when flow slows to a trickle. In practice, a stable 100 g/h of methanol or acetone stays within plus or minus 0.15 percent accuracy on our customer test benches in Malaysia.
Vibrating Tube Material and Size Logic
Tube sizing is not only about flow capacity. You also have to prevent pressure drop across the sensor. If you run 100 g/h of a 200 cP oil through a DN1 tube, the pressure loss may exceed 1.5 bar. That is too high for many dosing pumps. A DN2.5 tube reduces velocity and keeps back pressure lower. Silver Instruments offers 316L wetted parts as standard, with Hastelloy C22 optional. For food grade 100 g/h syrup lines, we have a 3A approved surface finish down to Ra 0.8 µm. A dairy partner in Auckland tested the DN2 version with chocolate flavouring and reported no clogging over six months.
Transmitter, Output, and Hazardous Area Notes
The integrated transmitter converts tube oscillation into a mass flow signal. You get a 4 to 20 mA HART output, plus a pulse for totalisation. If you work in a Zone 1 area, we supply an ATEX certified remote transmitter. Most 100 g/h applications in petrochemical pilot plants need that certification. Here is the thing: the built-in PT100 temperature sensor lets the transmitter correct density in real time. So you do not need an external densitometer for blends. A small hydrogen peroxide dosing skid in Brazil uses exactly this setup with a DN1.5 meter, feeding 80 to 100 g/h into a bleaching tower.
Common Piping Mistakes at Low Flows
Engineers sometimes mount a micro Coriolis meter on a vibrating steel frame. That is a problem because external noise from pumps confuses the phase shift measurement. Use a solid pipe stand or wall bracket. Because the meter produces a tiny deflection, the connecting pipe must be rigid. We have seen a customer in Bangladesh lose 20 percent accuracy just from unsupported 6 mm tubing flapping in the walkway breeze. Also, install a simple filter upstream. A 40 micron screen catches rust flakes before they dent the thin tube walls.
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A paint manufacturer in Ho Chi Minh City needed to dose 100 g/h of butyl acetate into a continuous reactor. Their previous oval gear meter seized after three days because the solvent was too thin. We recommended an SMF-M DN1.5 with Kalrez seals. The vibrating tube meter ignores missing backpressure and gives a steady 4 mA baseline at zero flow. The plant now logs mass total via Modbus RTU, and their batch colour consistency improved by 12 percent. This changed their view on low-flow metering.
How to Size Your Coriolis Meter for 100 G/H
Start with your lowest and highest expected flow, not just the nominal 100 g/h. If you sometimes run 30 g/h during flushing, a DN1 tube works. If you spike up to 300 g/h, pick DN2. Check your maximum allowable pressure drop. Viscosity above 50 cP can choke a small tube fast. Our sizing software needs your fluid name, density at operating temperature, viscosity in cP, inlet pressure in bar, and acceptable pressure loss. Then it picks the tube diameter and confirms turndown. Most engineers skip the viscosity part and then complain about zero stability. Do not skip it.
FAQ about Silver Instruments Micro Coriolis Flow Meters
What is the minimum measurable flow with the SMF-M series?
The SMF-M sensor can detect flow as low as 0.02 kg/h for water-like fluids. Real world stable reading at 0.05 kg/h is typical. At 100 g/h you operate far from the noise floor, so accuracy stays tight.
Can I use the same meter for gas flow at 100 g/h?
Coriolis meters measure mass. A gas at 100 g/h is a very large volumetric flow at low pressure. You need a special low-density gas tube design. For example, hydrogen at 100 g/h at 2 bar behaves differently than liquid. Tell our team it is gas; we might recommend a different sensor body.
Do I need a straight pipe run upstream?
No. Coriolis meters do not require flow straighteners. A right-angle elbow right before the inlet is fine. This saves space on crowded chemical skids.
What is the typical lead time for a 100 g/h flow meter?
Standard 316L DN1.5 meters ship in 2 weeks from our stock. Custom Hastelloy or Ex d transmitters add 4 weeks. We keep spare meters in Sydney and Singapore for fast delivery to the ASEAN region.
How do I verify accuracy on site?
Use the gravimetric method. Weigh the captured fluid on a lab scale with 0.01 g resolution over a fixed time. The meter does not need field recalibration if zero is done correctly. We provide a field zero button on the transmitter.
Send your flow range in g/h, fluid type, viscosity in cP, pressure in bar, temperature in Celsius, and pipe size DN to our engineers. We will return a specific sensor and transmitter combination for your 100 g/h Coriolis flow meter, including price and lead time for your region. Visit Silver Instruments at flow-meter.com.au.
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