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Displacer Level Transmitter Common Faults and Treatment-Transmitter shows FAILHDWR

Failure Phenomena
Transmitter shows FAILHDWR

Cause Analysis
1. Transmitter Fault

Treatment
1. Replace a transmitter head
Displacer Level Transmitter Common Faults and Treatment- Light up and dark down

Failure Phenomena
The main control room shows 0, the instruments LCD screen shows the same content, but light up and dark down.

Cause Analysis
1. Torque tube stiffness is back to zero

Treatment
1. Use 475 communicator to adjust stiffness value indication.
Displacer Level Transmitter Common Faults and Treatment-No changes

Failure Phenomena
Instrument water mark and hanging weight calibration both show 0, there is no change.

Cause Analysis
1. Transmitter fault, offset is too large

Treatment
1. Modify the offset into 0.
Displacer Level Transmitter Common Faults and Treatment-There is no change with 3.7MA output

Failure Phenomena
LCD splashes screen, there is no change in volume output 3.7MA

Cause Analysis
1. Transmitter fault

Treatment
1. Replace the transmitter head and use it after inputting the original parameters.
Displacer Level Transmitter Common Faults and Treatment-Communicator is unable to communicate

Failure Phenomena
Water in the transmitter enclosure, non-linear fluctuations, fail to match the transmitter to the actual level, failure to communicate with the communicator.

Cause Analysis
1. Transmitter fault

Treatment
1. Replace the transmitter head and use it after inputting the original parameters.
Displacer Level Transmitter Common Faults and Treatment- The display value fluctuates

Failure Phenomena
The display value fluctuates

Cause Analysis
1. Site supply voltage is not stable

Treatment
1. Stabilizing the site supply voltage at 12~30W
Displacer Level Transmitter Common Faults and Treatment-Two displacer level transmitters are inconsistent.

Failure Phenomena
Two displacer level transmitters are inconsistent.

Cause Analysis
1. Transmitter fault

Treatment
1. Re-adjust the parameters
Displacer Level Transmitter Common Faults and Treatment- No change in fixed values

Failure Phenomena
The transmitter head cannot be calibrated and the output is fixed at a constant value.

Cause Analysis
1. Transmitter fault
2. Make the stiffness value is back to zero

Treatment
1. Replace a transmitter
2. Adjust the stiffness value
Displacer Level Transmitter Common Faults and Treatment- Display of negative values getting progressively smaller

Failure Phenomena
As the level rises, the display shows progressively smaller negative values.

Cause Analysis
1. The left and right transmitter heads are installed backwards
2. Calibration error

Treatment
1. Adjust the position of transmitter head
2. Zero fullness is set backwards
Displacer Level Transmitter Common Faults and Treatment-Communicator is unable to communicate

Failure Phenomena
Communicator is unable to communicate

Cause Analysis
1. Check the communicator model and version.
2. Check if there is any problem with power supply.

Treatment
1. Use communicator (Rosemount 275, 375, 475) that supports the HART protocol.
2、Replace the power supply.
3、Change the safety barrier, or use 250 ohm resistor.
Displacer Level Transmitter Common Faults and Treatment-Unable to calibrate properly

Failure Phenomena
Transmitter output continues to decrease and cannot be calibrated properly.

Cause Analysis
1. Torque tube failure.
2. Inner displacer is deflated, leaking or into the fluid

Treatment
1. Replace torque tube
2. Replace inner displacer
Displacer Level Transmitter Common Faults and Treatment-There is no change with transmitter output

Failure Phenomena
The transmitter displays 0%; the level changes and the meter output remains unchanged.

Cause Analysis
1. The density value of the instrument parameter becomes "0".
2、The instrument parameter torque tube stiffness is "0".
3、The locking device of the transmitter is not pushed to the unlocked position.
4、The inner displacer is off or the anti-vibration rubber ring is not taken out.

Treatment
1. Re-input the correct density value.
2. Re-input the torque tube stiffness value 8-30 and re-calibrate the instrument at two points.
3、Push the locking device to the unlocked position.
4、Reinstall the inner displacer or remove the anti-vibration rubber ring.
Displacer Level Transmitter Common Faults and Treatment- Current value does not match

Failure Phenomena
The LCD shows the percentage and level values do not match the actual output current value.

Cause Analysis
1. Incorrect input of URV and LRV.
2. Instrument calibration not carried out with a regular communicator, resulting in the digital signal not matching the analogue signal.

Treatment
1. Re-input the URV and LRV values (URV = range; LRV = zero).
2. Calibrate the current using the modulo calibration function of communicator.
Displacer Level Transmitter Common Faults and Treatment- The current goes up and down

Failure Phenomena
The instrument output current goes up and down during calibration.

Cause Analysis
1. Power supply failure.
2. Poor insulation of the instrument.

Treatment
1、Check the power supply and replace the safety grid.
2、Check the insulation of the instrument terminals, if the insulation is faulty, replace the transmitter head.
Displacer Level Transmitter Common Faults and Treatment-There is no change with signal

Failure Phenomena
The transmitter head displays a garbled code and the output signal does not change.

Cause Analysis
1. Circuit board fault.
2、The power supply voltage is not normal.

Treatment
1. Replacement the transmitter head.
2、Test the power supply to replace the safety grid.
Displacer Level Transmitter Common Faults and Treatment- There is a large return difference

Failure Phenomena
Poor linearity of the tuning gauge and large return.

Cause Analysis
1、The inner displacer is stuck by debris, the range cannot be pulled
2、The inner displacer is not removed from the shockproof rubber ring
3、The power supply voltage is not normal
4、The parameter calculation is wrong during the calibration
5、The locking device of the transmitter is not pushed to the unlocked position

Treatment
1、Remove the debris
2、Remove the rubber ring
3、Adjust the power supply voltage
4、Recalculate the correct parameters
5、Push the locking device to the unlocked position
Displacer Level Transmitter Common Faults and Treatment-Inaccurate indication

Failure Phenomena
After the instrument has been calibrated and put into use, there is a deviation from the actual level value and the indication is not correct.

Cause Analysis
1, Inaccurate process parameters (actual density is not consistent with the design density).
2、The density of the medium changes due to on-site accompanying heat.
3、Inaccurate indication of the level meter in site.

Treatment
1、Re-confirm the process parameters, recalibrate the instrument according to the new density, or use the fixed point migration function to modify the instrument display and output.
2、Adjust the accompanying heat temperature to prevent changes in the density of the medium being measured.
3、Check the local indicator to make sure it accurately reflects the actual level.
Displacer Level Transmitter Common Faults and Treatment- Output maximum or over-range

Failure Phenomena
Instrument displays the output maximum or over-range and there is no change in calibration and no change in local indication.

Cause Analysis
1、The inner displacer is dislodged.
2, Instrument junction box fault.
3、The locking device of the transmitter is not pushed to the unlocked position.

Treatment
1、Connect the inner displacer
2、Replace the junction box
3、Push the locking device to the unlocked position
Displacer Level Transmitter Common Faults and Treatment-Level changes

Failure Phenomena
The actual level of the device changes and the instrument indication and output does not change with the level or the change is inconsistent.

Cause Analysis
1、The inner displacer anti-vibration rubber ring is not taken off and rubs against the chamber wall.
2、The inner displacer or lever is stuck by a foreign object.
3, the outer displacer is not installed vertically and friction occurs with the inner displacer.
4, the inner displacer connector is installed backwards and the inner displacer rubs against the chamber wall.
5、The locking device of the transmitter is not pushed to the unlocked position.

Treatment
1、In order to prevent collision damage to the inner displacer and chamber during transportation, the inner displacer will be fitted with an anti-vibration rubber ring, which should be removed during the installation of the equipment. Remove the rubber ring during installation.
2、Check whether there are foreign objects at the inner displacer and lever, and remove the foreign objects.
3、Correct the outer barrel to be perpendicular to the ground.
4、Reinstall the inner displacer correctly.
5、Push the locking device to the unlocked position. (The direction of the arrow)
Displacer Level Transmitter Common Faults and Treatment-There is no action with switch

Failure Phenomena
Level changes but there is no action of switch

Cause Analysis
1. Whether there are impurities stuck between the magnet rod and the jacket

Treatment
1. Remove the magnet rod and remove any impurities sucked onto the magnet.
Magnetic Float Level Transmitter Common Faults and Treatment-Remote output changes but there is no change with site indication.

Failure Phenomena
Remote outputting changes but there is no change with site indication.

Cause Analysis
1. Damaged ammeter or poor contact

Treatment
1. Replace the ammeter
Magnetic Float Level Transmitter Common Faults and Treatment-There is no change with remote output

Failure Phenomena
Level changes, indicated on site but no change in remote output.

Cause Analysis
1. Damaged detection circuit board
2. Ball float is not floating

Treatment
1. Replace the damaged electronic parts of the detection board
2. Check whether the actual density matches the design density, whether the float has been damaged
Ball Float Level Transmitter Common Faults and Treatment- No indication from ammeter

Failure Phenomena
No indication from ammeter

Cause Analysis
1. The switch wire is broken, trigger the electronic switch and check whether the current value output of the left and right gears is normal and whether there is a break in the circuit.

Treatment
1. If there is a problem on one side, remove the circuit board and solder the switch connections. If the electronic switch does not work, it needs to be replaced.
Ball Float Level Transmitter Common Faults and Treatment-Unable to calibrate

Failure Phenomena
Unable to calibrate

Cause Analysis
1. The output of the transmitter head is not in the same direction as the float, it is adjusted backwards.

Treatment
1. Lower the float to the minimum level again, reset it according to the instructions and commission it.
Ball Float Level Transmitter Common Faults and Treatment-Leakage

Failure Phenomena
Leakage

Cause Analysis
1. After a period of time, the seal packing rubs against the spindle and creates a gap

Treatment
1. Adjust the two bolts behind the radiator and turn the balance bar at the same time to adjust it to a suitable tightness (note: do not adjust it too tightly to avoid the spindle being held up)
Ball Float Level Transmitter Common Faults and Treatment-Changes

Failure Phenomena
The indication does not change with the fluid level and the balance lever gets heavy when it is pulled.

Cause Analysis
1. The seal packing expands and holds the spindle due to the rise in fluid temperature after the start of work
2. The balance is not adjusted properly
3. The float is not installed in place or the float has fallen off

Treatment
1. Adjust the two directional bolts behind the radiator, while turning the balancing rod to adjust to a suitable tightness (Note: do not loosen too much to avoid leakage)
2. Readjust the position of the balancing hammer to achieve balance
3. Check the installation of the float
Displacer Level Transmitter Common Faults and Treatment-No display

Failure Phenomena
After powered on, there is no LCD display and no signal output.

Cause Analysis
1. Reverse polarity connection of the power supply or power supply failure.
2、There is a broken circuit in the line.

Treatment
Check that the power supply voltage is normal and detect any break in the power circuit; if there is a safety barrier in the circuit, check that it is working properly; connect the positive and negative power supply correctly.
Displacer Level Controller Common Faults and Treatment-Switch

Failure Phenomena
Level reaches specified position but there is no action with switch

Cause Analysis
1. The float (ball) is too heavy and does not float
2. Factory locking nut is not loosened inside the electronic assembly
3. Pressure is too high and the float (ball) is deflated

Treatment
1. Confirm the density
2. Open the enclosure and loosen the locking nut
3. Confirm the pressure level, remove the connection flange and take out the float (ball) to see if it is damaged
Magnetic Float Level Transmitter Common Faults and Treatment-Remote output

Failure Phenomena
No local indication and no remote output

Cause Analysis
1. Not connected to power supply
2. Power supply polarity is reversed
3. Damaged electronic device in the circuit detection board

Treatment
1. Not connected to power supply
2. Power supply polarity is reversed
3. Damaged electronic device in the circuit detection board
Float Level Controller Common Faults and Treatment-Switch

Failure Phenomena
Level reaches specified position but there is no action with switch

Cause Analysis
1. Ball is too heavy and not floating
2. Wrong installation position

Treatment
1. Confirm density or replace float
2. Confirm installation position according to instructions

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Engineering Service

Question

Displacer Level Transmitter Common Faults and Treatment-Transmitter shows FAILHDWR

Transmitter shows FAILHDWR

1. Transmitter Fault

1. Replace a transmitter head

Displacer Level Transmitter Common Faults and Treatment- Light up and dark down

The main control room shows 0, the instruments LCD screen shows the same content, but light up and dark down.

1. Torque tube stiffness is back to zero

1. Use 475 communicator to adjust stiffness value indication.

Displacer Level Transmitter Common Faults and Treatment-No changes

Instrument water mark and hanging weight calibration both show 0, there is no change.

1. Transmitter fault, offset is too large

1. Modify the offset into 0.

Displacer Level Transmitter Common Faults and Treatment-There is no change with 3.7MA output

LCD splashes screen, there is no change in volume output 3.7MA

1. Transmitter fault

1. Replace the transmitter head and use it after inputting the original parameters.

Displacer Level Transmitter Common Faults and Treatment-Communicator is unable to communicate

Water in the transmitter enclosure, non-linear fluctuations, fail to match the transmitter to the actual level, failure to communicate with the communicator.

1. Transmitter fault

1. Replace the transmitter head and use it after inputting the original parameters.

Displacer Level Transmitter Common Faults and Treatment- The display value fluctuates

The display value fluctuates

1. Site supply voltage is not stable

1. Stabilizing the site supply voltage at 12~30W

Displacer Level Transmitter Common Faults and Treatment-Two displacer level transmitters are inconsistent.

Two displacer level transmitters are inconsistent.

1. Transmitter fault

1. Re-adjust the parameters

Displacer Level Transmitter Common Faults and Treatment- No change in fixed values

The transmitter head cannot be calibrated and the output is fixed at a constant value.

1. Transmitter fault 2. Make the stiffness value is back to zero

1. Replace a transmitter 2. Adjust the stiffness value

Displacer Level Transmitter Common Faults and Treatment- Display of negative values getting progressively smaller

As the level rises, the display shows progressively smaller negative values.

1. The left and right transmitter heads are installed backwards 2. Calibration error

1. Adjust the position of transmitter head 2. Zero fullness is set backwards

Displacer Level Transmitter Common Faults and Treatment-Communicator is unable to communicate

Communicator is unable to communicate

1. Check the communicator model and version. 2. Check if there is any problem with power supply.

1. Use communicator (Rosemount 275, 375, 475) that supports the HART protocol. 2、Replace the power supply. 3、Change the safety barrier, or use 250 ohm resistor.

Displacer Level Transmitter Common Faults and Treatment-Unable to calibrate properly

Transmitter output continues to decrease and cannot be calibrated properly.

1. Torque tube failure. 2. Inner displacer is deflated, leaking or into the fluid

1. Replace torque tube 2. Replace inner displacer

Displacer Level Transmitter Common Faults and Treatment-There is no change with transmitter output

The transmitter displays 0%; the level changes and the meter output remains unchanged.

1. The density value of the instrument parameter becomes "0". 2、The instrument parameter torque tube stiffness is "0". 3、The locking device of the transmitter is not pushed to the unlocked position. 4、The inner displacer is off or the anti-vibration rubber ring is not taken out.

1. Re-input the correct density value. 2. Re-input the torque tube stiffness value 8-30 and re-calibrate the instrument at two points. 3、Push the locking device to the unlocked position. 4、Reinstall the inner displacer or remove the anti-vibration rubber ring.

Displacer Level Transmitter Common Faults and Treatment- Current value does not match

The LCD shows the percentage and level values do not match the actual output current value.

1. Incorrect input of URV and LRV. 2. Instrument calibration not carried out with a regular communicator, resulting in the digital signal not matching the analogue signal.

1. Re-input the URV and LRV values (URV = range; LRV = zero). 2. Calibrate the current using the modulo calibration function of communicator.

Displacer Level Transmitter Common Faults and Treatment- The current goes up and down

The instrument output current goes up and down during calibration.

1. Power supply failure. 2. Poor insulation of the instrument.

1、Check the power supply and replace the safety grid. 2、Check the insulation of the instrument terminals, if the insulation is faulty, replace the transmitter head.

Displacer Level Transmitter Common Faults and Treatment-There is no change with signal

The transmitter head displays a garbled code and the output signal does not change.

1. Circuit board fault. 2、The power supply voltage is not normal.

1. Replacement the transmitter head. 2、Test the power supply to replace the safety grid.

Displacer Level Transmitter Common Faults and Treatment- There is a large return difference

Poor linearity of the tuning gauge and large return.

1、Remove the debris 2、Remove the rubber ring 3、Adjust the power supply voltage 4、Recalculate the correct parameters 5、Push the locking device to the unlocked position

Displacer Level Transmitter Common Faults and Treatment-Inaccurate indication

After the instrument has been calibrated and put into use, there is a deviation from the actual level value and the indication is not correct.

1, Inaccurate process parameters (actual density is not consistent with the design density). 2、The density of the medium changes due to on-site accompanying heat. 3、Inaccurate indication of the level meter in site.

Displacer Level Transmitter Common Faults and Treatment- Output maximum or over-range

Instrument displays the output maximum or over-range and there is no change in calibration and no change in local indication.

1、The inner displacer is dislodged. 2, Instrument junction box fault. 3、The locking device of the transmitter is not pushed to the unlocked position.

1、Connect the inner displacer 2、Replace the junction box 3、Push the locking device to the unlocked position

Displacer Level Transmitter Common Faults and Treatment-Level changes

The actual level of the device changes and the instrument indication and output does not change with the level or the change is inconsistent.

Displacer Level Transmitter Common Faults and Treatment-There is no action with switch

Level changes but there is no action of switch

1. Whether there are impurities stuck between the magnet rod and the jacket

1. Remove the magnet rod and remove any impurities sucked onto the magnet.

1. Transmitter fault
2. Make the stiffness value is back to zero

1. Replace a transmitter
2. Adjust the stiffness value

1. The left and right transmitter heads are installed backwards
2. Calibration error

1. Adjust the position of transmitter head
2. Zero fullness is set backwards

1. Check the communicator model and version.
2. Check if there is any problem with power supply.

1. Use communicator (Rosemount 275, 375, 475) that supports the HART protocol.
2、Replace the power supply.
3、Change the safety barrier, or use 250 ohm resistor.

1. Torque tube failure.
2. Inner displacer is deflated, leaking or into the fluid

1. Replace torque tube
2. Replace inner displacer

1. The density value of the instrument parameter becomes "0".
2、The instrument parameter torque tube stiffness is "0".
3、The locking device of the transmitter is not pushed to the unlocked position.
4、The inner displacer is off or the anti-vibration rubber ring is not taken out.

1. Re-input the correct density value.
2. Re-input the torque tube stiffness value 8-30 and re-calibrate the instrument at two points.
3、Push the locking device to the unlocked position.
4、Reinstall the inner displacer or remove the anti-vibration rubber ring.

1. Incorrect input of URV and LRV.
2. Instrument calibration not carried out with a regular communicator, resulting in the digital signal not matching the analogue signal.

1. Re-input the URV and LRV values (URV = range; LRV = zero).
2. Calibrate the current using the modulo calibration function of communicator.

1. Power supply failure.
2. Poor insulation of the instrument.

1、Check the power supply and replace the safety grid.
2、Check the insulation of the instrument terminals, if the insulation is faulty, replace the transmitter head.

1. Circuit board fault.
2、The power supply voltage is not normal.

1. Replacement the transmitter head.
2、Test the power supply to replace the safety grid.

1、Remove the debris
2、Remove the rubber ring
3、Adjust the power supply voltage
4、Recalculate the correct parameters
5、Push the locking device to the unlocked position

1, Inaccurate process parameters (actual density is not consistent with the design density).
2、The density of the medium changes due to on-site accompanying heat.
3、Inaccurate indication of the level meter in site.

1、The inner displacer is dislodged.
2, Instrument junction box fault.
3、The locking device of the transmitter is not pushed to the unlocked position.

1、Connect the inner displacer
2、Replace the junction box
3、Push the locking device to the unlocked position

1. Damaged detection circuit board
2. Ball float is not floating

1. Replace the damaged electronic parts of the detection board
2. Check whether the actual density matches the design density, whether the float has been damaged

1. The seal packing expands and holds the spindle due to the rise in fluid temperature after the start of work
2. The balance is not adjusted properly
3. The float is not installed in place or the float has fallen off

1. Adjust the two directional bolts behind the radiator, while turning the balancing rod to adjust to a suitable tightness (Note: do not loosen too much to avoid leakage)
2. Readjust the position of the balancing hammer to achieve balance
3. Check the installation of the float

1. Reverse polarity connection of the power supply or power supply failure.
2、There is a broken circuit in the line.

1. The float (ball) is too heavy and does not float
2. Factory locking nut is not loosened inside the electronic assembly
3. Pressure is too high and the float (ball) is deflated

1. Confirm the density
2. Open the enclosure and loosen the locking nut
3. Confirm the pressure level, remove the connection flange and take out the float (ball) to see if it is damaged

1. Not connected to power supply
2. Power supply polarity is reversed
3. Damaged electronic device in the circuit detection board

1. Not connected to power supply
2. Power supply polarity is reversed
3. Damaged electronic device in the circuit detection board

1. Ball is too heavy and not floating
2. Wrong installation position

1. Confirm density or replace float
2. Confirm installation position according to instructions