The NIVOCAP is a 2-wire capacitive level transmitter that provides an ideal solution for level measurement of conductive or non-conductive liquids. The probe of the instrument and the reference probe (which can be either the metal wall of the tank or installed separately) operate as opposing plates of a capacitor. Between the plates of this capacitor, the air is replaced by a medium with greater dielectric constant than the air during filling the tank. Therefore, the capacitance is changing directly proportional to the level. The incorporated electronic circuitry measures the capacitance difference and converts it to an output signal proportional to level.
The NIVOCAP is a capacitive level transmitter that uses the plates of the capacitor as a probe and the reference probe (wall of the tank) for level measurement. The dielectric constant of the air is εr=1. The basic capacity of the probe mounted in empty tank is C0, which depends on the relative dielectric constant of the air and the mounting position. During filling the capacitance between probe and reference will increase proportionally with the level and the (εr) relative dielectric constant of the medium.
The condition of an accurate level metering is that the change of capacity has to be proportional to the change in level. To comply with the above the probe and the referential probe have to be parallel, because capacity depends on the distance between the two plates. Best suited for the most accurate level measurement is the so called coaxial arrangement.
Setting up the NIVOCAP is easy. Using a simple technique the unit is to be “taught” the minimal (close to minimal) and maximal (close to maximal) levels. If fully filling and draining is inconvenient or not feasible, the teaching is possible at any odd levels with the help of indirect assignment feature.
Basic functions can be configured by the programming buttons. With the help of the SAP-202 plug-in display a simplified programming can be accomplished which covers full parameter programming.
The MultiCONT processes and displays measurement data supplied by NIVELCO HART equipped transmitters connected to a Multidrop loop. Up to 15 transmitters (also mixed models) can be connected and remote programming can be also performed through the MultiCONT. Re-transmission of the data is possible via RS485 communication line to a PC or PLC when needed.
Instruments with HART output can be connected to a PC interfaced by a UNICOMM HART-USB modem. A HART multidrop loop can consist of a maximum of 15 transmitters. All measured values can be visualized and/or remote programmed by the PC. Applicable software: EView2 configuration software or NIVISION process visualization software.
| Supply Voltage | 12-36 V DC |
|---|---|
| Ambient Temperature | −13 to 158 °F |
| Process Temperature | −22 to 392 °F |
| Process Pressure | max. 580 psig |
| Output | 4-20 mA, HART |
| Process Connection | 1″, 1.5″ |
| Ingress Protection | IP67 |
| Approvals | ATEX |
Copyright 2024 © All Rights Reserved Worldwide
