80-5212-302 Datasheet, PDF (2/4 Pages) Magnetrol International, Inc. – Kotron® RF Point Level Switches

TECHNOLOGY
The amount of capacitance developed in any vessel is
determined by the size (surface area) of the probe, the
distance from the probe to its ground, and the dielectric
of the medium being measured. Considering that the
probe’s mounting position is fixed, and that the dielectric
value of the medium is constant, then the amount of
capacitance developed in any vessel becomes dependent
upon the amount of the probe which is covered by the
media.
As media rises and falls in the tank, the amount of capaci-
tance developed between the sensing probe and the
ground also rises and falls. This change in capacitance is
sensed by the electronics.
The capacitance-controlled oscillator circuit, mounted on
the probe, changes the capacitance signal to a variable
frequency. This stabilized signal can then be sent to the
main electronics located up to 5000 feet (1500 meters)
away via standard shielded, twisted pair cable. Using stan-
dard twisted pair cable eliminates the costly coaxial or
triaxial cable utilized by other manufacturers which limits
the installation to 150 feet (45 meters) maximum distance.
MODEL NUMBER
Models available for quick shipment, usually within one week after factory
receipt of a purchase order, through the Expedite Ship Plan (ESP).
MOUNTING
80 Integral
81 Remote
Note: Delivery is ESP only if Model 80/81
and probe selected are both ESP.
HOUSING
52 NEMA 4X, carbon steel, ³â„4" NPT single conduit
80 NEMA 4X/7/9, aluminum, ³â„4" NPT dual conduit
TYPE
12 Single set point for alarm control with narrow differential
22 Single set point for pump control with wide differential
INPUT POWER
0 120 VAC
1 240 VAC
2 24 VDC
8
3
2
PROBES
A full range of rigid and flexible probes for conductive
and non-conductive materials is available in various
lengths and materials of construction. For further
information on probe assemblies, refer to bulletin 50-125.
2
CABLE
Connecting cable should be shielded, twisted pair,
22-gauge stranded conductors and may be ordered
using Magnetrol part number 009-7146-XXX
(where XXX = length in feet). 10 feet (3 meters) min.,
5000 feet (1500 meters) max. length. For lengths over
999 feet, use X009-7146-999 where X=total length in feet.