The LEVEL-CAP sensor consists of 2 parts:
– CAP-SENSOR level probe to be placed on the tank of the product to be measured
– CAP-LOGIC logic board which manages the signal coming from the CAP-SENSOR and provides digital (relay with potential-free contact), analogue (selectable in 0-10V or 0-20mA mode) or serial (used by the Easy-charge adhesive granule loader) outputs.
The CAP-SENSOR detects the level by measuring the capacitance between the sensitive electrode and the electrode used for cooling:
– In case of granules, powder or electrically insulating liquids, the reference electrode can be the wall of the tank where the CAP-SENSOR is installed (in this case the tank must be made of metallic or electrically conductive material; in case of non-conductive tanks, a metallic reference electrode must be placed a few cm away from the CAP-SENSOR electrode).
– In case of electrically conductive granules, powders or liquids, the material whose level is to be controlled acts as the reference electrode, provided that electrical contact between the CAP-SENSOR reference and the material itself is guaranteed. In this case it is necessary to provide the PTFE insulator for CAP-SENSOR code LEX-xxCMPT (where xx is the length of the sensor expressed in cm), to prevent the sensor from being short-circuited by the material itself, which would prevent it from working properly.
Microprocessor technology used by the LEVEL-CAP makes it extremely easy to program, which is done by self-acquiring the minimum (and if required maximum) levels.
To complete the parameters to be programmed, there is also hysteresis, which makes it possible to establish the amplitude of the level variation necessary to make the digital output (minimum level alarm relay) switch and to inform the Easy-charge charger of the need to recharge the tank.
Two types of level probes are available, both working with the same CAP-LOGIC logic board.