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Coriolis Flow Meter Calibration Procedure PDF and Certified Metrology Bench Loops
Quick Answer: Silver Automation Instruments wet calibrates each Coriolis flow meter on a certified metrology bench loop before shipment. The calibration procedure PDF records mass flow, density, and temperature data against reference standards. Buyers receive a meter specific calibration certificate PDF, not a generic type test report.
What the Calibration Procedure Covers
A Coriolis flow meter calibration procedure is more than a zero check. On our certified bench loops the procedure includes sensor zero adjustment, multi point flow calibration, density verification, and temperature compensation. First we stabilize the meter at operating temperature. Then we run the meter at 5 flow points from 10 percent to 100 percent of the requested range. Each flow point is repeated three times. The reference loop measures the same flow with a master Coriolis meter or a gravimetric weigh scale. We record the average error, repeatability, and meter factor at each point.
Most engineers skip this part. In practice the zero adjustment matters a lot on low flow applications. A DN15 meter measuring 50 kg/h of additive needs a stable zero. A DN100 meter running 60,000 kg/h of crude oil is less sensitive to zero drift but still needs span correction. The calibration procedure handles both cases.
Certified Metrology Bench Loops at Silver Instruments
We operate dedicated calibration rigs in our production facility. The main liquid loop runs on filtered water with a gravimetric weigh scale as the primary reference. A second loop runs on diesel for hydrocarbon service. Each loop has a master Coriolis reference meter calibrated by an ISO/IEC 17025 accredited laboratory. Pressure sensors and PT100 temperature sensors are on the loop. The data acquisition system samples mass flow, density, and temperature every 0.5 seconds during each calibration run.
Because calibration is traceable, the final PDF report includes the loop ID, the reference meter serial number, and the calibration date. We do not issue a type test certificate as a substitute for a meter specific calibration. A paint manufacturer in Southeast Asia once ordered 12 Coriolis meters for solvent batching. The batch control system needed each meter to have its own calibration curve. We supplied 12 separate PDF certificates from the same metrology bench loop. The plant engineer used the meter factor data to correct the batching recipe.
Calibration Certificate PDF Content
The calibration certificate PDF is the deliverable you should request before accepting a quote. Our standard certificate includes the customer order number, meter tag number, sensor serial number, and transmitter serial number. It also lists the calibration fluid, temperature, pressure, and flow range. The reference standard identification and calibration loop ID appear on the first page. For each flow point the report shows measured mass flow rate, reference flow rate, error in percent of rate, repeatability, and meter factor. Density calibration and temperature compensation results are included. Zero stability is recorded before and after calibration.
The PDF is not a scan of a handwritten test sheet. We generate the report from the calibration bench software. The final file is clear, searchable, and accepted by third party inspectors. If you need a hard copy with a wet stamp, we can send it with the shipment. The PDF is the version your maintenance team will keep for audits.
Calibration Parameters and Tolerances
We calibrate Coriolis flow meters from DN15 to DN150 as standard. Larger line sizes from DN200 to DN300 are available on request. The standard liquid calibration accuracy is plus or minus 0.1 percent of rate. Repeatability is plus or minus 0.05 percent. Zero stability depends on the sensor size. A DN15 sensor has a typical zero stability around 0.2 kg/h. A DN50 sensor is closer to 2 kg/h. These figures come from the calibration report of each meter, not from a catalog.
For gas flow calibration, our standard setup covers air and nitrogen on a separate bench loop. Gas calibration accuracy is plus or minus 0.35 percent of rate. Temperature compensation is normally from minus 40 degrees Ce
Traceability and ISO/IEC 17025
Traceability means the calibration result can be linked to national standards through an unbroken chain of comparisons. Our metrology bench loops use reference standards that are calibrated by accredited laboratories. The master Coriolis meters and weigh scales carry ISO/IEC 17025 certificates. The calibration procedure PDF lists the certificate number of each reference standard. This is enough for most quality audits in food and beverage, pharmaceutical, and chemical plants.
We have seen customer sites in the Middle East ask for ISO 17025 documentation before loading a skid. A desalination plant in Saudi Arabia requested the calibration loop ID and reference meter certificate for 10 DN80 Coriolis meters. We attached the documents to the shipment. The plant accepted the package without a third party recalibration. That saved about two weeks of startup time.
How to Specify a Calibration Range for Your Coriolis Meter
When you request a quote, send us the pipe size, fluid name or type, flow range, operating pressure, and temperature. For example, a water distributor in Vietnam needs a DN50 meter for 2,000 kg/h to 20,000 kg/h at 6 bar and 25 degrees Celsius. We select the sensor and set the calibration range around that window. Here is the thing. Range selection changes the meter factor. Do not give a range like zero to 100,000 kg/h if your normal flow is 8,000 kg/h. The calibration points will be too spread out and the low flow accuracy may be weaker. A tight range gives you a better meter factor for your process.
For a mixed application like diesel and water, tell us the primary fluid. We can run the calibration on water and apply a density correction. For high viscosity products like palm oil or molasses, we may recommend a dedicated calibration on a viscous oil loop. A food plant in Indonesia once needed a meter for chocolate syrup at 4,500 cP. We ran the calibration on a sugar solution with similar viscosity. The meter factor was adjusted before delivery. The plant started batching without field tuning.
FAQ
Can I get a sample calibration procedure PDF before ordering? Yes. We can send a redacted sample from a previous meter. Contact Silver Automation Instruments by email or WhatsApp and request a sample calibration certificate PDF.
Do you calibrate Coriolis meters from other brands? In most cases we calibrate our own Silver Instruments Coriolis flow meters. For third party meters we can provide a calibration service only if the meter is in good condition and the transmitter supports the required communication protocol.
What information must I provide for a calibration quote? Send us pipe size (DN), flow range (kg/h or t/h), fluid type, operating pressure (bar), and temperature (degrees Celsius). Add the communication output if known, such as 4 to 20 mA HART, Modbus RTU, or pulse.
Can you calibrate a Coriolis meter for custody transfer? We calibrate to standard metrology bench loop procedures with traceable references. For legal custody transfer you may need a local weights and measures approval. Tell us the country and application. We can supply the calibration data and documentation required by the local authority.
How long does calibration take before delivery? Standard calibration adds 2 to 5 working days after the meter passes final wiring and pressure test. For special fluids or tight range calibration, add 3 to 7 working days. We do not ship a meter without its calibration PDF unless the customer accepts a standard test report.
Contact Silver Automation Instruments for a calibration procedure PDF sample or a quote. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will reply with a meter recommendation and a calibration scope for your process.
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