Oil monitoring by equipment

Oil monitoring is used most on four groups of equipment. Each group has a different risk. The readings to watch are chosen from those risks.

Gearbox oil analysis

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Gearbox with the oil sensor on the oil line and vibration and temperature points on the bearings
  1. 1Vibration · Input shaft bearing
  2. 2Temperature · Input shaft bearing
  3. 3Vibration · Output shaft bearing
  4. 4Temperature · Output shaft bearing
  5. 5Oil sensor · Oil circulation line
Schematic drawing. Sensor positions are set on site for each machine.

Risks: Water and dust get into the oil. The oil ages with heat. Gears and bearings wear.

Monitored: Viscosity, water in the oil and the wear-metal trend. Vibration and temperature on the bearings.

Where it is used: Cement kiln and mill gearboxes, conveyor drives, rolling-mill and paper-machine gearboxes.

Hydraulic oil monitoring

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Hydraulic unit with the oil and particle sensor on the return line and vibration and temperature points on the pump
  1. 1Vibration · Pump bearing
  2. 2Temperature · Pump bearing
  3. 3Oil sensor · Return line
  4. 4Particle sensor · Return line
Schematic drawing. Sensor positions are set on site for each machine.

Risks: The oil picks up particles and water, and its viscosity drifts. Dirty oil is one of the main causes of valve and pump wear.

Monitored: Particles (ISO 4406 code), water in the oil and viscosity. Vibration and temperature on the pump.

Where it is used: Presses, injection moulding machines, rolling-mill hydraulics and construction equipment. The sensor is fitted on the return or bypass line.

Compressor oil monitoring

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Screw compressor with the oil sensor on the oil return line and vibration and temperature points on the motor and compressor
  1. 1Vibration · Motor bearing
  2. 2Temperature · Motor bearing
  3. 3Vibration · Compressor bearing
  4. 4Temperature · Compressor bearing
  5. 5Oil sensor · Oil return line
Schematic drawing. Sensor positions are set on site for each machine.

Risks: The oil thickens through oxidation. Water gets into the oil. The machine overheats.

Monitored: Viscosity and dielectric trend, water in the oil. Vibration and temperature on the motor and compressor bearings.

Where it is used: Compressed-air systems in food, automotive, cement and general manufacturing.

Engine, generator and turbine oil

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Generator bearing and oil tank with the oil sensor on the tank and vibration and temperature points on the bearing
  1. 1Vibration · Bearing housing
  2. 2Temperature · Bearing housing
  3. 3Oil sensor · Oil tank
Schematic drawing. Sensor positions are set on site for each machine.

Risks: In engines, fuel gets into the oil or coolant leaks in. Water gets into turbine bearing oil.

Monitored: Viscosity drop, dielectric and water rising together, particles. Vibration and temperature on the bearing.

Where it is used: Generator sets, hydropower plants and ship main engines.

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The equipment to start with is defined on site.

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