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10 g/h Flow Meter Mass Measurement Verification Specs
Quick Answer: A 10 g/h mass flow meter is verified using a high-resolution analytical balance and a stopwatch, not with a master meter on a bench. The only traceable method is gravimetric proving with degassed deionized water at a stable temperature, typically 20 °C to 22 °C. Silver Instruments specifies a three-point mass accumulation test that catches zero drift and repeatability errors you cannot see on a live reading. Our S-Series micro-flow Coriolis meters complete this test inside a 0.15% repeatability envelope.
Why 10 g/h Mass Verification Demands a Different Approach
Most flow lab calibrations use a master flow meter or a weigh scale with a diverter. At 10 grams per hour, that changes. The total mass collected over five minutes is around 0.83 grams. A drip, a vibration, or a half-degree temperature swing spoils the result. Because the flow rate is so small, traditional piston provers and bell provers simply cannot handle the resolution. In practice, this is a bench-scale experiment, not a pipe-spool exercise.
Field verification specs for a 10 g/h loop come from ISO 10790 and the manufacturer own factory acceptance test data. Most engineers skip the ISO document and go straight to the gravimetric procedure. Here is the thing. You need a balance with 0.1 mg or better readability, a smooth low-pulsation pump, a bubble-free liquid path, and a room where the draft and temperature variation stay inside ±0.5 °C for 30 minutes. Without these, the verification is not valid.
Gravimetric Proving: The Only Traceable Reference for 10 g/h
The working principle is simple. You set a fixed flow setpoint, let the meter stabilize for 15 minutes, then collect the liquid into a covered beaker on a tared analytical balance. You start a stopwatch the moment the first drop hits the beaker. After exactly 300 seconds you cap the beaker and record the mass. Repeat three times at 5 g/h, 10 g/h, and 15 g/h, which represent 50%, 100%, and 150% of the span. The average error must fall inside ±0.25% of reading for a custody-grade setup, but Silver Instruments targets ±0.15% for its S-Series factory checks.
Many operators miss the evaporation correction. A 0.83 g water sample loses mass to evaporation at roughly 0.02 g/h in still air at 22 °C, and that skews a 5-minute reading by 0.2% or more. The fix is a narrow-neck flask with a loose PTFE cap and a pre-test evaporation blank run. We have seen this on customer sites in Thailand and Mexico. A paint manufacturer in Ho Chi Minh City ignored the evaporation blank and spent two days chasing a phantom 0.3% drift. After they sealed the collection vessel, the S-Series meter passed within 0.12% repeatability.
Density, Temperature, and the Role of a PT100
The mass flow readout is not enough; you need the liquid density corrected to 20 °C reference. At 10 g/h, a 1 °C error in water density changes the calculated volume by 0.02%, which is small but compounds with other tolerances. Silver Instruments micro-flow Coriolis meters have a built-in PT100 in the tube wall. In verification mode, you can log the temperature and density every second via the 4-20 mA HART output. Use demineralized water that has sat overnight to reach room temperature. Do not pour chilled water straight from a cooler; the density lag will show up as a meter error that is not real.
If your process fluid is viscous, say a 50 cP silicone oil, you cannot substitute water. The meter verification must use the actual fluid because the tube resonant frequency shifts with density and viscosity. Silver Instruments can factory-calibrate the S-Series with your fluid sample. A flavor and fragrance house in Egypt ran exactly that test. They shipped 2 liters of a propylene glycol-based flavoring, and we validated the 10 g/h spec with their liquid at 25 °C. The meter arrived on site and passed their in-house verification the next day.
Silver Instruments S-Series: Designed for Micro-Flow Verification
The S-Series covers flow ranges from 0 to 60 g/h and 0 to 6
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A typical verification kit from Silver Instruments includes the meter, a 24 V DC loop supply with a calibrated multimeter, and a written verification procedure. Factory certificates show a five-point calibration at 0, 5, 10, 15, and 20 g/h, traceable to an ISO 17025 accredited lab. Every S-Series ships with a USB stick holding the raw calibration data. On your next audit, you show the CSV file and the balance certificate, and the verification is closed.
On-site Verification Procedure in Five Straight Steps
Plumb the meter in a vertical or horizontal leg as per the manual, with 10 diameters of straight pipe upstream. Purge the lines with isopropyl alcohol if the fluid is aqueous, then flush with degassed DI water. Set the flow to 10.00 g/h using a needle valve or a micro-gear pump with a stroke adjuster. Let the system run for 20 minutes while monitoring the density reading; it must hold within ±0.001 g/cm³. Place the covered beaker on the balance, tare, and open the collection funnel while the batch output triggers a relay or hand-start the stopwatch. Collect for 300 seconds, cap immediately, record the mass, and repeat twice more. Calculate the relative error: (meter total – balance mass) / balance mass × 100. If the average is beyond ±0.3%, check for bubbles, perform a zero calibration, and repeat the run. The whole test takes about 90 minutes on a clean system.
FAQ: 10 g/h Mass Flow Verification
What is the smallest flow rate a Coriolis meter can verify with gravimetric proving?
Silver Instruments S-Series meters verify down to 2 g/h using a 0.01 mg readability balance and a 600-second collection time. For field use, 5 g/h is the practical lower limit because of evaporation and vibration limits.
How often should I verify a 10 g/h mass flow meter?
Most pharmaceutical and food-additive plants verify every 12 months, but batch-critical dosing systems often run a daily zero check and a three-month gravimetric spot test. The S-Series onboard diagnostics log the zero drift, so you can extend the full verification to 24 months if the drift stays below 0.05 g/h.
Can I verify with water if my process fluid is ethanol?
Only if the factory has given you a fluid-specific correction factor. Ethanol density is 0.789 g/cm³ at 20 °C; a meter calibrated for water reads about 12% high in mass flow. Silver Instruments provides a multi-fluid calibration table in the purchase scope if you specify the intended process fluid.
What resolution balance do I need for a 10 g/h flow verification?
A balance with 0.1 mg readability and an internal calibration motor is the minimum. A 1 mg balance adds a ±1.2% uncertainty to a 0.83 g sample, which is outside any useful spec. We use a Mettler Toledo XPR205 or equivalent at our lab.
Which Silver Automation Instruments model works best for a 10 g/h spec?
Order the S-Series SCF-015A. It covers 0.1 to 60 g/h, comes with a DN1.5 tri-clamp connection, 316L wetted parts, and an integral transmitter. Send us your process fluid viscosity, temperature, and target accuracy, and we will ship the meter with a traceable 10 g/h verification certificate from our ISO 17025 lab.
Send your pipe size, operating temperature, fluid name, and required flow range to Silver Automation Instruments. Our application engineers will propose a verified 10 g/h mass flow package that fits your existing control system, whether it is a simple 4-20 mA loop or a Modbus RTU network.