How to troubleshoot YOKOGAWA ADMAG TI series AXW electromagnetic flowmeter (25-1800mm)?

How to troubleshoot YOKOGAWA ADMAG TI series AXW electromagnetic flowmeter (25-1800mm)?

Equipment Fundamentals and Safety Standards

1. Equipment positioning and scope of application

The AXW electromagnetic flowmeter is a pipeline type electromagnetic flow measurement device suitable for continuous measurement of fluid flow with a diameter of 25-1800mm (1-72 inches). It is divided into integrated flowmeter (sensor and transmitter integrated) and split type device (remote sensor+remote transmitter, such as AXW4A, AXG1A, AXFA11), and needs to be used with Yokogawa designated analyzer/communication tools (such as Modbus, PROFIBUS PA, EtherNet/IP and other communication protocols).

2. Core security principles

(1) Maintain operational safety

Personnel qualifications: Only authorized personnel from Yokogawa can carry out repairs, and wiring and maintenance must be carried out by professional engineers; Two or more people are required to cooperate in using the trolley during transportation (the equipment is heavy to avoid falling and injuring people).

Power supply and anti-static: Power off and wait for more than 20 minutes before maintenance (to prevent residual electric shock caused by capacitors); Wear an anti-static wristband when touching the circuit board to avoid damaging components due to static electricity.

Environment and fluid protection: The surface of the equipment may be hot to the touch under high-temperature fluid conditions, and it is necessary to prevent burns; Avoid contact with fluids and residual gases during maintenance of toxic fluids; Do not open the cover in damp environments (loss of protection level).

(2) Equipment protection requirements

Cover and sealing: When opening/closing the cover, check the threads and O-ring for damage/foreign objects. The O-ring should be regularly coated with silicone grease, and any damage should be replaced in a timely manner; Unused cable entrances need to be sealed with Yokogawa specific plugs (otherwise the protection level will be lost).

Grounding and power supply: protective grounding terminals are required (functional grounding terminals cannot be used as substitutes); An external 15A circuit breaker (compliant with IEC60947 standard) should be installed and labeled as a "power-off device".

Routine inspection and model confirmation

1. Regular inspection items

Key Points for Periodic Inspection of Inspection Content

Check for condensation and moisture inside the terminal box once a year to prevent short circuits in the circuit

Tighten the pipeline joint screws twice a year to prevent fluid leakage or equipment loosening from affecting the measurement

Electrode and lining inspection should be set as needed (such as for viscous/abrasive fluids) to check for electrode scaling and lining wear (to avoid measurement errors)

2. Model and specification confirmation

Identification location: The model, suffix code, serial number, instrument coefficient, and other information are marked on the nameplate of the equipment casing (the nameplate styles of integrated flow meters, remote sensors, and remote transmitters are different, as shown in Figure 2.1-2.6 of the manual).

Key information: Confirm that the model is consistent with the order, and provide the model and serial number during repair; Device information (such as sensor serial number and software version) can be viewed through device parameters (refer to the corresponding communication manual).

Equipment adjustment and maintenance operations

1. Adjustment of cable entry direction

Depending on the type of device, there may be differences in the adjustment method, and power off is required first. The core steps are as follows:

Equipment type, caliber range, tool requirements, adjustment angle range, key considerations

Integrated flow meter+small caliber remote sensor 25-450mm (1-18 inches) No. 5 hex wrench -90 °,+90 °,+180 ° (one step every 90 °). It is forbidden to loosen the screws on the opposite side of the cable inlet; Tighten 4 bolts diagonally after adjustment

Large caliber remote sensor (Style S1) 500-1800mm (20-72 inches) with 1.5 hex wrench and 46 hex wrench -140 ° to+180 °. First loosen the hex nut, then loosen the neck screw, adjust and tighten in sequence

Large caliber remote sensor (Style S2) 500-1800mm (20-72 inches) 5 # hex wrench -90 °,+90 °,+180 ° (one step every 90 °) integrated flowmeter, do not loosen the screws on the opposite side

Note: The cable entry direction cannot be adjusted for submersible and district heating/anti condensation types (optional code DHC).

2. Maintenance of transmitter

(1) Display unit adjustment (only supported by AXW4A, not supported by AXG1A)

Direction adjustment: After power off, use a No. 3 hex wrench to open the cover, loosen the 2 fixing screws of the display unit, rotate clockwise 90 ° (do not remove the connector), re tighten the screws, close the cover and lock it.

Display board replacement: After opening the cover, loosen the screws of the display board, unlock the connector according to the "UNLOCK" mark and pull it out. When installing the new board, align the interfaces to avoid cable entanglement, and torque the screws to 0.6 ± 0.05 N · m.