Troubleshooting Magnetic Flap Level Transmitters

Magnetic flap level transmitters play a vital role in accurately measuring liquid levels in various industrial processes. However, they may encounter several issues during operation. If you're in search of high - quality magnetic flap level transmitters and comprehensive industrial instrumentation solutions, Sichuan VACORDA Instrument Manufacturing Co., Ltd. is a trusted choice. Since 1996, this national high - tech enterprise has been dedicated to the R & D, production, and sales of automation instruments, with a wide range of products that meet the needs of multiple industries.

Common Problems - On - Site Display

1. Level Indicator Remains at Zero or Low Position

Symptom: The level gauge shows a reading at or near zero, much lower than the actual liquid level.

Causes: The density of the medium may be lower than the designed density, preventing the float from rising. Or the float could be stuck.

Solutions: First, check if the medium density matches the design. If the actual density is more than 0.1g/cm³ lower, replace the float. If the density is okay, empty the measuring tube to check for impurities or remove the bottom flange to see if the float is jammed. Sichuan VACORDA's products are designed with high - quality floats that are less likely to be affected by density differences, ensuring more stable measurement performance.

2. Level Indicator Stays at a Fixed Position

Symptom: The level gauge reading doesn't change regardless of the liquid level.

Causes: The float is usually stuck.

Solutions: Try closing the liquid - side root valve, opening the gas - side root valve, and the drain valve to flush with the pressure or liquid in the container. Gently tap the measuring cylinder near the float. If this doesn't work, for ball - type drain valves, use a non - sharp object to push the float from the bottom drain port. For globe - type drain valves, open the bottom flange cover. VACORDA's instruments are designed for easy maintenance, making these troubleshooting steps more straightforward.

3. Discontinuous Display of Flip - Columns

Symptom: Only the position of the float turns red, and the display is not continuous.

Causes: There may be a mismatch between the display and the magnetic poles of the magnetic float, or the magnetic components inside the float have shifted, causing the magnetic poles to deflect.

Solutions: Take out the float to check for abnormalities. If there is an obvious abnormal sound when shaking the float, the magnetic components have likely shifted. If the float seems normal, the problem may be a mismatch between the display and the magnetic float (if using non - original parts). Replace the magnetic float or the display. Sichuan VACORDA's products use high - precision magnetic components to reduce the occurrence of such problems.

4. Random Distribution of Red Flip - Columns

Symptom: The red flip - columns are scattered randomly.

Causes: It could be due to the liquid level changing too quickly for the display to keep up, or the magnetic force of the float has weakened, or the distance between the floats is too large for sufficient magnetic force.

Solutions: If it's because of rapid liquid - level changes, consider replacing the flip - plate with a faster - responding one or reducing the diameter of the liquid - phase connection pipe. If not, test the float near the display. If the magnetic force is insufficient, replace the float. VACORDA's magnetic flap level transmitters are designed to adapt to different liquid - level change rates, providing more accurate and stable displays.

5. Sudden Increase in Level Indicator

Symptom: The level gauge shows a sudden increase in value and remains at the top even when the liquid level doesn't rise.

Causes: This often occurs in negative - pressure conditions when the negative - pressure suction port is close to the magnetic flap's gas - phase interface and the suction force is too strong, pulling the magnetic float to the top.

Solutions: Install a restrictor orifice plate on the gas - phase side, reduce the opening of the gas - phase valve, or open only the liquid - phase valve during startup and then slowly open the gas - phase valve after the pressure stabilizes. VACORDA's products can be customized to better adapt to different working pressure conditions, reducing the likelihood of such problems.

6. Rapid Fluctuation of Level Indicator

Symptom: The level gauge reading fluctuates rapidly while the liquid level changes slowly.

Causes: This usually happens in negative - pressure conditions with a small container when frequent liquid inflow and outflow, along with vacuum pumping, occur.

Solutions: Installing a restrictor orifice plate on the gas - phase side can improve the situation. Sichuan VACORDA's technical team can provide professional advice on optimizing the use of instruments in such complex working conditions.

Common Problems - Remote Transmission Output

1. No Display and No Current Output

Symptom: The transmitter shows no display and has no current output.

Causes: Loose connection terminals, reversed power supply polarity, or abnormal power supply.

Solutions: Check the connection of each terminal, measure the power - supply voltage, reverse the positive and negative poles if necessary, and if the problem persists, consider internal wire breakage or module failure. Sichuan VACORDA's transmitters are equipped with reliable connection terminals and stable power - supply systems to minimize such issues.

2. Low Current Value and Large Voltage Drop

Symptom: The transmitter has no display, the current value is less than 3.7mA, the no - load voltage is normal, but there is a large voltage drop when connected to the instrument.

Causes: Transmitter failure, power - supply line problems, or power - supply module issues.

Solutions: Test the transmitter with a separate power supply, check the power - supply line, and replace the power - supply module if needed. VACORDA's products are strictly tested during production to ensure the stability of the power - supply system and reduce the probability of such failures.

3. Mismatch between Transmitter Output and On - Site Display

Symptom: The transmitter output and the on - site display have a large error.

Causes: The transmitter may have shifted, the zero - point and full - scale are not aligned, the range is incorrectly calibrated, or the transmitter has drifted.

Solutions: Check the position of the transmitter, re - calibrate it according to the operation manual, and verify the output. VACORDA's transmitters come with clear calibration instructions and high - precision calibration technology to ensure accurate measurement results.

4. Large Fluctuations in Output Current

Symptom: The output current of the transmitter fluctuates significantly.

Causes: Transmitter failure or interference from the site or the cabinet.

Solutions: Open the cover to check for water ingress or damage, test the output with a separate power supply. If there is no damage, use shielded cables for signal transmission and ensure proper grounding. If grounding is not possible, add an anti - interference circuit. VACORDA's products are designed with anti - interference measures to ensure stable output.

sender strip Fault Troubleshooting

1. Reed Switch Sender Strip

Reed switch sender strips have only two leads and can be tested for resistance without power supply. The normal resistance is 100Ω/m. Use a multimeter's resistance range to connect the two leads and slide a guide from one end to the lead end. The resistance should decrease slowly, with a minimum of 1Ω. If there is a resistance jump or a section with no resistance change, there is a fault. If everything is normal, the problem may be with the变送 module, and you can directly replace the module.

2. Hall - Type Sender Strip

Hall - type sender strips require power to work, usually with three leads (red for power + (3.3V), blue for resistance output, and black for the common terminal). To test the resistance, connect the red and black wires to a 3.3V DC power supply and the multimeter's resistance range to the blue and black wires. There are two specifications, 100Ω/m and 1000Ω/m, and the resistance test method is the same as above.

Sender Strip Common Problems and Fault Manifestations

Short - circuit: If a reed switch or Hall switch is short - circuited, the resistance of the section beyond the short - circuit point (from the short - circuit point to the far end) is short - circuited, and the output value in this section will not change.

Open - circuit: A damaged reed switch or Hall switch, or a detached solder joint can cause an open - circuit at a single point, which only affects that point. If a resistor has a loose solder joint, when the float is outside the open - circuit point, the sender strip fails, and the circuit is open. The red module outputs about 2.2mA, the orange module outputs about 3mA, and the intelligent meter head outputs 24mA. When the float is inside the open - circuit point, normal measurement is possible.

In conclusion, understanding these common problems and solutions of magnetic flap level transmitters can help ensure the normal operation of liquid - level measurement systems. Sichuan VACORDA Instrument Manufacturing Co., Ltd. not only provides high - quality products but also offers professional technical support to help users solve various problems in the use of instruments, enabling more efficient industrial production.

WhatsApp: +86 18379001102 / Email: sales@vacorda.com