As a maintenance technician for flow control equipment, do you often encounter sudden failures in devices such as the 93718-353 electromagnetic flowmeter? This manual provides professional troubleshooting solutions for 7 common issues with insertion-type electromagnetic flowmeters with fluororubber lining, helping you quickly restore the normal operation of flowmeters in the HKTMF and JYLDE series and ensure the continuity of industrial production.

1. Diagnosis and Handling of No Signal Output from the Flowmeter

When HKTMF or JYLDE series electromagnetic flowmeters have no signal output, first check whether the power supply module is supplying power normally. Use a multimeter to measure the input terminal voltage and ensure it meets the 24VDC±10% range required for model TOP-101-32. If the power supply is normal, then check the following in sequence:

• Whether the signal cable has an open circuit or short circuit (focus on checking oxidation at the BNC connector)
• Whether the internal fuse of the converter is blown (common in lightning strike failures of model 142654-775)
• Whether the resistance of the sensor excitation coil is within the standard range of 85±5Ω

For split-type flowmeters such as XDL-DC, it is recommended to use an oscilloscope to detect the electrode signal waveform, which should normally show a linear characteristic of 2.5mV/(m/s).

2. Solutions for Abnormal Measurement Value Fluctuation

When model 93636-135 electromagnetic flowmeters are used in the chemical industry, data fluctuations are often caused by the following reasons:

1. Changes in medium conductivity: When the liquid conductivity is lower than 5μS/cm, it is necessary to replace it with the special model TOP-101-25 with PTFE lining
2. Improper installation position: A straight pipe section distance of 10 times the pipe diameter should be maintained downstream of the pump valve (according to GB/T18659-2018 standard)
3. Poor grounding: Ground resistance must be ≤4Ω, and it is recommended to use a copper grounding ring + conductor with a cross-sectional area of ≥4mm²

2.1 Special case: Pulp measurement interference in the papermaking industry

For the jump fluctuation issue of model 93718-353 in pulp flow measurement, field data from Xi'an Shenghongchuang Instrument Co., Ltd. show:

3. Response Strategy for False Empty Pipe Alarms

The empty pipe detection function of model 93454-543 electromagnetic flowmeters may trigger false alarms under the following conditions:

• There are bubble clusters of ≥30% in the pipeline (installation of a deaerator is recommended)
• The liner scaling thickness exceeds 1.5mm (mechanical cleaning or chemical cleaning is required)
• The conductivity threshold is set too high (it should be adjusted to 80% of the actual value of the medium)

4. Calibration Specifications for Zero Drift

For TOP-101 series flowmeters, zero calibration should be performed according to the following steps:

1. Ensure the pipeline is completely filled with medium and the flow is stationary
2. Select the "Zero Adjust" function in the converter menu
3. Save the parameters after the stability indicator lights up

Note: Model 142654-775 needs to be calibrated at an ambient temperature of 20±2℃, and every 10℃ temperature difference may cause a 0.5% error.

5. Preventive Measures for Electrode Corrosion

For XDL-DC electromagnetic flowmeters under strong acid working conditions, it is recommended to adopt the following measures:

• Select a tantalum electrode + PTFE lining combination (resistant to 98% concentrated sulfuric acid)
• Test the electrode insulation resistance monthly (should be ≥100MΩ)
• Install a cathodic protection device (applicable to seawater media)

6. Key Points for Communication Protocol Configuration

When communication between model 93636-135 and the DCS system is interrupted, the following should be checked:

7. Troubleshooting Faults Caused by Mechanical Vibration

When the 93718-353 flowmeter installed near the pump room shows the following symptoms:

• Abnormal increase in cumulative flow value
• LCD display characters shaking
• Loose wiring terminal alarm

Solutions include installing rubber shock pads, replacing with armored cables, and tightening all mechanical connectors (torque must reach 2.5N·m).

Professional Maintenance Support Services

Xi'an Shenghongchuang Instrument Co., Ltd. provides the following for electromagnetic flowmeters in the HKTMF and JYLDE series:

• Factory calibration services (with CNAS certification certificate)
• 48-hour emergency response service
• Free technical training (including interpretation of the GB/T18660-2018 standard)

Contact our engineering team now to obtain a customized solution and ensure the continuous and stable operation of your flow measurement system.