Measuring method of Oil Content Monitor For Rolling / Cutting Oil & Emulsions:
The oil content directly relates to the sound velocity of the fluid. A change of 1% oil content brings about an increase of approx. 2 m/s.
The measurement is done with a sound velocity sensor SPR 4115, connected to the process control unit mPDS 2000.
The concentration directly correlates with the sound velocity, concentration and temperature are continuously displayed on the screen of the process control unit.
Up to 255 different characteristics of oil emulsions can be stored in the processor of the control unit, each with its own target concentration and limit range.
To interface with control / monitoring systems the mPDS2000 provides 4-20 mA output signals, alarm relays and serial communications.
A pressure measurement and compensation should be performed in case of large pressure fluctuations, as the sound velocity of the emulsions is influenced by pressure (compressibility of oil). Typical values for pressure influence: 0.15 m/s per bar.
Additional sources of uncertainty of Oil Content Monitor For Rolling / Cutting Oil & Emulsions:
- formation of coating on the sensor
- abraded particles in the emulsion
- entry of other oils
The “A” version of the SPR sensor (robust DIN 11851 thread connection) is easily removed from the line for quick cleaning.
Depending on the oil type, cleaning of the sensor may be required once or twice a day to avoid drifting results. Simple wiping with a soft cloth will remove any coating.
Influence of abraded particles can be minimized by suitable installation site, preferably after a filter.
Other oils (morg oils, tramp oils) will also influence the sound velocity, greatly depending on the type of oil.
Accuracy of oil concentration measurement +/- 0.2% (depending on oil type and impurities)
Measuring range of Oil Content Monitor For Rolling / Cutting Oil & Emulsions:
0 to 10 %
All wetted parts are SS316 and various process connection options are provided.
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