Current position > News detail
『ABB Kent Taylor MagMaster Flow Meter: Industrial utility main calibration guides.』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
ABB Kent Taylor MagMaster Flow Meter: Industrial Utility Main Calibration Guides
Quick Answer: For a MagMaster on a utility main, run a dry transmitter check first, then perform an in situ flow comparison with a portable ultrasonic meter. Calibrate against a traceable master meter every 12 to 24 months for billing or custody transfer. Send Silver Instruments your pipe size (DN), pressure (bar), temperature (°C), and flow range for replacement or calibration support.
Field Checks Before Any MagMaster Calibration
Here is the thing. Most utility engineers skip the baseline zero check and go straight to a flow comparison. That can hide electrode coating, a damaged earth ring, or a liner crack. Before you touch the transmitter, inspect the sensor body, the grounding rings, and the terminal box. Look for water ingress, corrosion, and loose shield wires.
On a DN300 to DN1200 water main, check the earthing system first. A poor earth can shift the reading by more than 1 percent. For wastewater with high grease, remove the sensor and check the liner for cuts. ABB MagMaster units often use PTFE or hard rubber liners with 316L electrodes. If the process conductivity drops below 20 µS/cm, the meter may become unstable. Confirm the actual velocity is above 0.3 m/s during calibration.
Dry Transmitter Calibration on the MagMaster
Dry calibration checks the converter electronics without removing the sensor from the pipe. Use a signal simulator or an ABB test box. Verify the zero point, the span, and the 4-20 mA HART output. Check the pulse output if the utility uses a data logger. Most MagMaster converters have a calibration menu that stores the sensor constant, the excitation current, and the zero offset.
Record the zero value before you change anything. A drift of more than 0.1 percent of full scale often points to moisture in the terminal compartment. Do not adjust the span until the zero is stable. After the dry check, test the analog output at 4.00 mA, 12.00 mA, and 20.00 mA. Some engineers only test 20 mA. That is not enough for a utility billing meter.
In Situ Flow Comparison with a Master Meter
For a quick field calibration, clamp a portable ultrasonic flow meter on a straight section of the same main. Compare the MagMaster reading with the reference meter at three flow rates. Use 10 to 20 percent, 45 to 55 percent, and 80 to 100 percent of the normal operating range. Hold each point for at least 5 minutes. A paint manufacturer in Vietnam checked one flow point and called it a calibration. That is not enough for any utility main.
Look for a deviation above 0.5 percent between the MagMaster and the portable meter. If the deviation is repeatable, adjust the calibration factor. If the deviation changes with flow rate, the issue is usually hydraulic, not electronic. Check the upstream straight run, the pipe fullness, and the sensor alignment. For a MagMaster on a partially filled gravity sewer line, a flow comparison can be misleading because the reference meter may not handle the gas voids.
Laboratory Wet Calibration for Utility Mains
When the MagMaster is used for billing, laboratory wet calibration is the safe option. The sensor is removed and sent to an ISO 17025 lab. The lab runs the meter on a master rig with traceable flow standards. For DN300 and larger, a master meter rig is often more practical than a weigh tank. Typical un
We have seen water utilities in Manila and Jeddah request wet calibration only after a billing dispute. That is late. A better approach is to baseline the meter at installation, then schedule a wet calibration every 24 months or every 12 months for custody transfer. Ask the lab for the before and after error curve. That data helps you plan the next replacement.
Calibration Intervals for Industrial Utility Mains
Municipal potable water billing: 12 months. Wastewater effluent monitoring: 12 to 24 months. Raw water abstraction with silt: 12 months. Clean raw water: 24 months. Desalination brine lines: check electrodes every 6 months because of crystallization, but full calibration can be 24 months. These are practical intervals, not laws. Local regulations in some countries may force shorter intervals.
Replacement Options from Silver Instruments
If the MagMaster fails calibration or the liner is damaged, you do not have to retire the whole main. Silver Instruments supplies electromagnetic flow meters from DN15 to DN2000. Liners include PTFE and hard rubber. Electrode options include 316L, Hastelloy C, titanium, and tantalum. Outputs include 4-20 mA HART, pulse, and Modbus RS485. Accuracy is 0.5 percent of reading for standard models and 0.2 percent for high accuracy models.
For a DN600 potable water main with 4-20 mA HART and Modbus, a Silver Instruments SIL-EM600 with PTFE liner and 316L electrodes is a common replacement. We can supply an ISO 17025 calibration certificate with the meter. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will recommend a meter that matches the existing piping and output loop.
FAQ: ABB Kent Taylor MagMaster Main Calibration
How often should a MagMaster on a utility main be calibrated? For billing or custody transfer, every 12 months. For general process monitoring, every 24 months is often enough. If the water contains silt or grease, shorten the interval.
Can I calibrate a MagMaster without removing it from the pipe? Yes, you can run a dry transmitter check and an in situ flow comparison with a portable ultrasonic meter. For billing accuracy, a laboratory wet calibration is more defensible.
What flow rate points are needed for a good calibration? Use three points. Cover 10 to 20 percent, 45 to 55 percent, and 80 to 100 percent of the normal operating range. Hold each point for at least 5 minutes.
What is the typical accuracy after laboratory calibration? Expect 0.1 to 0.25 percent of reading depending on the rig and meter size. Small meters often show better numbers than large utility mains.
Does Silver Instruments sell a direct replacement for ABB MagMaster? We supply process compatible electromagnetic flow meters. Sizes range from DN15 to DN2000 with PTFE or hard rubber liners and 316L, Hastelloy C, titanium, or tantalum electrodes. Outputs include 4-20 mA HART, pulse, and Modbus RS485.
Contact Silver Instruments
For a replacement electromagnetic flow meter or calibration support, contact Silver Instruments. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Send us your pipe size (DN), pressure (bar), temperature (°C), flow range, and process fluid. We will reply with a specific model and price.