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Coriolis Mass Flow Meter Emerson Micro Motion Calibration Guide
Quick Answer: Emerson Micro Motion Coriolis meters require field zero calibration at operating conditions. If drift exceeds 0.2%, run the zero procedure with the pipe full and no flow. Silver Instruments supplies compatible Coriolis meters with 0.1% accuracy and can recalibrate your Micro Motion sensor in our Nanjing factory. Send fluid details and pipe size to [email protected] for a quote.
Why Field Calibration Drifts
Temperature changes and pipe stress shift the zero point. Here is the thing: a 0.1 kg/h offset looks tiny. Over 24 hours, you lose 2.4 kg. A sugar refinery in Thailand saw 0.15% drift on molasses at 80°C. After a zero calibration, the batch total matched the weighbridge. Most technicians do not check the zero because the meter still shows flow. But the error adds up. ATEX Zone 1 models need no special procedure; just ensure the transmitter enclosure is closed before powering the HART communicator.
Zero Calibration Steps for Micro Motion Transmitters
Ensure the pipe is full and flow is zero. On a 1700 or 2700 transmitter, press and hold the zero button. The display confirms when done. Use ProLink II or HART handheld for older RFT9739. In practice, we tell customers to run the zero three times and average the values. A water plant in Saudi Arabia did this and reduced offset from 0.15 kg/min to 0.02. If drive gain stays high, check for coating or two-phase flow.
When to Replace Instead of Recalibrate
Frequent zero drift or low pickoff voltage points to sensor wear. Instead of paying for Micro Motion sensor repair, you can install a Silver Coriolis meter. We have seen this on customer sites many times: a fishmeal plant in Peru swapped a CMF100 with our DN50
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Silver Instruments Calibration Services
We calibrate our own meters on a water rig and with test oil for viscous products. For Emerson Micro Motion units, we offer third-party calibration in Nanjing. Many customers in Africa and the Middle East ship sensors to us to avoid long local queues. After calibration, we return the unit with an ISO 17025 certificate. Tell us your fluid, viscosity (cP), pressure (bar), temperature (°C), and pipe size (DN). Send to [email protected] or call +86-25-68650347. WhatsApp +86-25-52155837, WeChat +86 15365082610.
FAQ
Q1: How often calibrate Micro Motion? Under stable conditions, verify zero every 6 months. With abrasive or coating fluids, check every 3 months.
Q2: Can I use ProLink for zero calibration? Yes. Connect ProLink to the service port and run the zero calibration wizard. This works for 1700, 2700, and 3000 series transmitters.
Q3: What if my meter has a dented tube? Coriolis meters with dented tubes cannot calibrate properly. Replace the sensor. Silver Instruments offers a lower-cost replacement that matches the face-to-face length.
Q4: Do you calibrate for high-viscosity liquids? Yes. We use test oil up to 500 cP to match your application. State your viscosity when sending the request.
Q5: How fast can you ship a calibrated Silver Coriolis meter? Stock models DN15 to DN80 ship in 3 working days. Larger sizes build in 7 to 10 working days. We provide a traceable calibration certificate.