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Model P21 Detailed Datasheet 
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Features
· High inherent gain sensitivity
· Allows full scale calibration over a very small level change
· Insensitive to surface turbulence
· Output signal is linear to liquid depth
· Calibration can be done outside the vessel
· Only a small 1" NPT process connection required
· Use for sensing light hydrocarbons and materials with low dielectric constants
· Linear output in irregular tanks
· Built in ground reference for plastic & lined tanks
Application
This probe is equipped with a wrap around concentric tubular ground reference sheath. It has high inherent gain sensitivity and is useful on materials having low dielectric constant, such as LPG, benzene, and other light hydrocarbons.
The linear ground sheath also allows it to be used with transmitters in horizontal cylindrical tanks and other containers having non-linear sidewalls. It also allows the electronic module (transmitter or switch) to be calibrated outside the vessel. This is done by turning the probe upside down, filling the tubular sheath with process liquid to the desired coverage depth, and adjusting the electronics unit at each liquid depth appropriate to the model configuration. Liquids that are gaseous at ambient conditions must be done under normal operating conditions.
Specifications
Process Working
Pressure: 1500 PSIG (100 BAR) @ 100°F (38°C).
Process Temperature: -460 to +450°F (-273 to +230°C).
Materials: 316 S.S. and PTFE Teflon® are basic; other metals
are optional.
Process Connections: 1" MPT is minimum; any larger threaded
or flanged connection is optional.
Ground Sheath: Metal tube, welded to the gland body. Sensing
probe centering guides are provided as needed.
Electronic Module: Compatible with all Delta Controls Models.
Maximum Insertion: 20 feet (6 meters).
Bottom Support Bracket: May be required when insertion is over
60 inches and the liquid is agitated or turbulent.
Double Block and Vent Seals: Optional for toxic and hazardous
services.
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