Product Info
The 12800 Series Pneumatic Level Transmitter/Controller is a pneumatic instrument used for measuring and controlling liquid levels in tanks and vessels. It converts changes in liquid level to a proportional pneumatic output signal that can be used to control a valve or other device.
Preventive Maintenance Schedule
Every 8000 Hours:
- Disassemble and clean the relay, including the metering orifice and nozzle.
- Inspect the displacer and replace if necessary.
- Check the resistance unit (on proportional-reset models) and clean if necessary.
Daily:
- Check the filter-regulator for accumulation of condensate and drain if necessary.
- Check the control valve for proper operation.
Monthly:
- Check the air circuit, including the metering orifice and nozzle, for cleanliness and proper operation.
- Inspect the instrument case mounting and tighten if necessary.
Parts List
- Case S/A: The instrument case that houses the internal components (Part Number: Not Available)
- Air Manifold S/A: The manifold that distributes the air supply to the internal components (Part Number: Not Available)
- Relay S/A: The pneumatic relay that amplifies the pressure variations at the nozzle (Part Number: Not Available)
- Mechanism Bracket S/A: The bracket that supports the internal control mechanism (Part Number: Not Available)
- Supply Gauge: The gauge that indicates the air supply pressure (Part Number: Not Available)
- Output Gauge: The gauge that indicates the output air pressure (Part Number: Not Available)
- Arc Lever: The lever that provides the motion take-off from the torque tube (Part Number: Not Available)
- Level Indicating Pointer: The pointer that indicates the level on the instrument scale (Part Number: Not Available)
- Nozzle Tubing S/A: The tubing that connects the nozzle to the air manifold (Part Number: Not Available)
- Bellows Tubing S/A: The tubing that connects the various bellows assemblies (Part Number: Not Available)
- Resistance Unit S/A: The resistance unit used in the proportional-reset controller (Part Number: Not Available)
- Reset Bellows Tubing S/A: The tubing that connects the reset bellows in the proportional-reset controller (Part Number: Not Available)
- Pneumatic Set Bellows S/A: The bellows assembly used to pneumatically set the control point in the pneumatic set controller (Part Number: Not Available)
Product Specs Sheet
- Size: The instrument case is approximately 8 inches wide, 10 inches high, and 6 inches deep.
- Weight: The instrument weighs approximately 15 pounds.
- Air Supply Pressure: The instrument requires a clean, dry air supply between 50 and 125 psi.
- Output Pressure Range: The instrument can provide an output pressure range of either 3-15 psi or 6-30 psi, depending on the model.
Troubleshooting
- Cycling of the controller:
- Check for cycling of other controllers in the process.
- Inspect the air supply system for pulsations caused by pumps or steam traps.
- Verify that the control valve is not sticking.
- Ensure the control valve is not oversized for the application.
- Drifting of the controller output:
- Verify that the air supply pressure and quantity are adequate.
- Check the output air system for leaks.
- Ensure the pressure drop in the control valve line and fittings is not excessive.
- Poor control performance:
- Check for dirt in the relay system.
- Inspect the mechanism for any friction or mechanical issues.
- Verify the nozzle and metering orifice are not partially plugged.
Please
note that any procedure, checklist, or other document available on Limble is provided for general education and
information only and does not constitute legal, medical, or financial advice. Limble makes the materials available
AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the
risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any
such use, including compliance with applicable law and with meeting any conditions of product warranties. It is
recommended to contact OEM for the most accurate information.
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