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Guide to Krohne Coriolis Flow Meter Manual PDF Promass Series True Mass Density and Temperature Tuning
Quick Answer: The Promass series true mass density and temperature tuning steps are often found in the Krohne Coriolis flow meter manual PDF. Correct tuning needs density calibration with two known fluids and a stable process temperature input. Silver Automation Instruments supplies Coriolis mass flow meters with the same tuning workflow and direct replacement support for many Promass and Krohne OPTIMASS installations.
Many engineers search for Krohne Coriolis Flow Meter Manual PDF Promass Series True Mass Density and Temperature Tuning. The search phrase mixes two well known Coriolis meter families. Promass is a registered series from Endress+Hauser. Krohne sells Coriolis meters under the OPTIMASS name. This guide covers the tuning logic that applies to both. It also applies to Silver Instruments Coriolis mass flow meters.
In practice, density accuracy depends on two things. First, the meter needs a correct two point density calibration. Second, the temperature compensation must be active and correct. Without these, density readings drift during process temperature changes. We have seen this on customer sites many times.
True Mass Density Tuning on Promass Series Meters
Most Promass series manuals describe density calibration with air and water. You start with an empty sensor. The meter reads a low density point. Then you fill the sensor with water. The meter reads a high density point. The transmitter calculates the density factor from these two points. This method is practical for many liquids.
For Krohne OPTIMASS meters and Silver Instruments Coriolis meters, the same two point method works. Some models accept a known fluid density value instead of water. You enter the density of your process fluid at the current temperature. The meter adjusts its internal calculation. This is useful when water cannot enter the process line.
Temperature Tuning Steps
Temperature tuning is not always a separate menu item. Instead, the meter corrects density using its internal PT100 sensor. You must enter the correct process temperature reference. Some field engineers skip this part. That causes errors. A 2 degree Celsius offset can shift density by 0.001 to 0.002 grams per cubic centimeter depending on the fluid. For a paint manufacturer in Vietnam that we supported, this shift caused a batch quality alarm.
Check the temperature input wiring first. Check the PT100 type. Some transmitters expect a 3 wire PT100. Others accept a 4 wire PT100. Wrong wiring creates a fixed temperature offset. Then verify the temperature reading against a calibrated thermometer. Adjust the offset in the transmitter menu if needed. Let the sensor soak at process temperature for 10 minutes before the final check.
Field Verification Without the Original Manual PDF
Many plants lose the original manual PDF. You can still verify tuning. Run the meter at a stable flow. Record the density reading. Take a sample of the process fluid. Test the sample with a laboratory density meter or a calibrated hydrometer. The difference should be within plus or minus 0.001 grams per cubic centimeter for standard Coriolis meters.
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Another practical check is the zero point. Drain the sensor and close the isolation valves. Let the sensor temperature stabilize. Run the zero adjustment. A zero shift of 0.5 kilograms per hour on a DN15 meter can change the density calculation on some transmitters. After zeroing, check the density reading with the sensor full of static fluid. It should match the fluid density at that temperature.
Silver Instruments Coriolis Meter Tuning Support
Silver Automation Instruments sells direct replacement Coriolis mass flow meters for many process lines. Our meters cover DN03 to DN150, with pressure ratings up to 100 bar and temperature ratings up to 150 degrees Celsius. We support 4-20 mA HART, pulse, and RS485 Modbus outputs. The density and temperature tuning menus are similar to Promass and Krohne OPTIMASS workflows. We provide a tuning checklist with every shipment.
We have seen this on a site in Chile. A water and wastewater contractor replaced a DN25 Krohne meter with our model. The original density reading was drifting by 0.002 grams per cubic centimeter during afternoon temperature peaks. We sent our tuning guide for the PT100 input and two point density calibration. The offset dropped to 0.0006. The customer used the same 4-20 mA HART wiring and kept the same PLC range.
FAQ
Q: Is Promass a Krohne series?
No. Promass is an Endress+Hauser series. Krohne sells OPTIMASS Coriolis meters. The tuning logic is similar across both brands. Silver Instruments sells compatible Coriolis meters with the same density and temperature tuning functions.
Q: How often should I tune density on a Promass or Krohne meter?
Check density every 6 months for standard liquid service. For abrasive or viscous fluids, check every 3 months. Repeat the density calibration after any sensor replacement or transmitter firmware update.
Q: What is the correct density calibration fluid for Coriolis meters?
Use air for the low point and clean water for the high point. For non aqueous process fluids, enter the known density value at the current process temperature. You can also use a certified reference fluid from your lab.
Q: Can I use a Promass manual PDF for a Krohne OPTIMASS meter?
The menu names differ. The physical tuning steps are the same. Use the manual as a general reference. For Krohne specific menus, find the OPTIMASS manual. Silver Instruments provides a universal tuning guide with our meters.
Q: Does Silver Instruments supply Coriolis meters for hazardous areas?
Yes. We offer Ex d and Ex ia versions for ATEX Zone 1 and Zone 2. We need your gas group, temperature class, and cable entry size to quote the correct model.
Send us your enquiry now. Tell us your fluid type, density range in grams per cubic centimeter, temperature in degrees Celsius, pressure in bar, pipe size in DN, and flow range in kilograms per hour. Our engineers will reply with a model, price, and tuning guide. Contact Silver Automation Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, WeChat: +86 15365082610.
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