User Manual & Datasheet V 1.2
1
Introduction
Casper is a microcontroller-based capacitance level limit
switch. It is suitable for fine, coarse, bulky solids, non-sticky
slurries, and liquids. The measuring system consists of an
electronic insert and a probe. It works by utilizing the dielec-
tric property of the application material.
Figure 1: Casper Product Image
2
Operating Principle
Casper works on the principle of capacitance. The probe
comprises a sense electrode, electrically isolated from the
metallic tank using a suitable insulator. The sense and the
vessel wall serve as the two electrodes of a capacitor with
the service material acting as the dielectric. A change in the
level of material causes a change in the dielectric, which in
turn causes the value of this tank capacitor to change.
Ø90
89
Pressure die-cast aluminium
weatherproof Housing
Cable Entry
Screwed Thread Connection
Sense
Prob
e Length
Figure 2: Description of Parts
3
Features
•
Universal power supply of 18 - 55 V DC and 90 - 265
V AC on the same terminal.
•
Customizable probe size.
•
Output options: Relay, PNP and Analog.
•
High temperature probe suitable for applications up to
250
◦
C.
•
Self-diagnosis for probe and electronics.
•
Popular with a wide range of materials: low-to-high
dielectric conductive materials / non-conductive mate-
rial.
4
Applications
•
Brewery
•
Chemicals
•
Dairy
•
Food and Beverages
•
Grain Handling
Sapcon Instruments Pvt.Ltd.
®
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