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Model P91 Detailed Datasheet 
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Features
· Measures from 2 to up
to 36 inches (50 to 900mm) of oil floating on water
· Neither oil nor water level has to be held constant; up to 50 feet (15 meters)
total elevation change can occur
· Works on large tank tramp oil collectors
· Works well with fresh or salt water
· Entire transmitter can be submerged to 50 feet (15 meters) without harm
· All 316 S.S. electronic housings are optional for highly corrosive and offshore
applications
· Insensitive to tank pressure from vacuum to 60 PSIG (-1 to 4 bar) is basic
· Hastelloy® "C" is optional
· Unaffected by foam, bubbles, and froth
· Works great with lip type rotatable skimmers
Application
The Delta Controls Model P91 probe floats on the top surface of oil in a skimmer or separation vessel. A vertical sensing rod, with parallel ground reference rods, is supported by outrigger floats. The sensing rod goes through the floating oil and into the water. The P91 probe/module measures the distance from the top of the oil to the interface between the water and the floating oil. This measurement is then converted into a 4-20 mADC signal equivalent to the thickness of oil present. Optionally, an on/off differential control signal can be produced to control a drainage pump or skimmer trough.
The Delta Controls Model P91 is used by petroleum refineries; machinery manufacturing plants, oil field salt water disposal companies, and similar industrial operating companies.
Specifications
Electronic Module:
Remote from sensor
Range: 0-6 to 0-36 inches (150 to 900 mm)
Oil Specific Gravity: 0.70 minimum
Tank Pressure: From hard vacuum to 60 PSIG (-1 to 4 BAR) is optional
Attachment: 0.0620 cable made of 316 S.S.
Interconnection: Strong and oil resistant. Allows pull up
for testing and maintenance. Also acts as a tether in large pond applications.
Has
a rubber tubular jacket over the signal cable; up to 60 feet (20 meters) long
Floats and Frame Support: 316 S.S.
Sensing Rod Jacket and Seals: PTFE extruded and welded Teflon®
Rating: Intrinsically safe; Class 1, Divisions 1 & 2, Groups
ABCD,EFG
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