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Working Principle:
The R2000T x uses impedance technology proven in tens of thousands of
applications. An L1840 Series Sensor Probe is mounted in the storage vessel. Two poles will
be formed by the sensor and tank wall. As the process material changes from not contacting
the probe to contacting the probe, a corresponding change in electrical impedance occurs
between the probe and the metal storage vessel wall. (For non-metallic storage vessels,
a "dual element" probe is used. In this case, the impedance change occurs between the
"active" and "ground" elements of the probe.)
The highly sensitive impedance measurement circuits inside theR 2000T xdetec tand
measure this impedance change by means of a low level, radio frequency current that flows
from the sensor, through the process material and back to the electronics via the metal
storage vessel wall (or via the probe ground element). This change in radio frequency
current is converted to a proportional DC signal. The electronics compares this DC signal
to a set point determined by the coarse and fine sensitivity adjustments, and triggers a
change in the state of the Probe Status LED and the Output Control Relay when the signal
level traverses the set-point level.
A coating of process material on a probe can effectively simulate a presence condition,
even when the process level is well below the probe. Princo point level probes incorporate
a "guard" element which negates this problem. Driven by the electronic circuitry, the guard
produces a correction signal, allowing the electronics to respond only to level changes
above and below the "active" element of the probe. The unit must be calibrated with the
probe coated for the guard to function correctly.
Features:
■ Suitable for wide application: can be used to measure almost all kinds of material, fly
ash, grain, powder, liquid, slimy material, electric material and non-electric material.
■ NULL-KOTETM Circuitry: Makes the sensor immune to adverse effects from conductive
coating build-up.
■ Easy-On Probe Connection: Automatically provides simple, fast installation and
reliable operation without wires, connectors, or terminal strips. Simply screw probe into
the housing.
■ Wide Temperature Range: Standard process temperature: -184 to 400°C, choose
ceramics probe for higher temperature.
■ Full functions: DPDT, Relay output, Status LED, 0~30 time relay.
Specifications:
Power supply: 220VAC, 50HZ or 24VDC
Power: 3W
Alarm: low level or high level, field adjustable.
Relay contacts: DPDT contacts 3.75A, 230VAC or 7.5A, 28VDC
Time relay: 0-30 second, adjustable.
Fail-safe Mode: Open or Close, field changeable.
Sensitivity: 0.3pf~800pf
Ambient temperature: -40℃~+66℃
Housing: Heavy duty cast aluminum housing, IP65
Electrical connector: 3/4” NPT |
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