804-R010-330 datasheet(4/32 Pages) MAGNETROL

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50-604 Kotron Model 804 Sentinel II RF Level Transmitter

1.0

Description

The Sentinel II is a unique, powerful level transmitter.

The leading-edge microprocessor-based circuitry has

non-volatile memory that requires no battery backup. To

simplify troubleshooting, powerful diagnostics not only

check all aspects of the system, but will actually indicate

the faulty section of the system. MagneCal™ offers the

user the greatest improvement in RF Capacitance—one

small level change (2% of span) is needed to calibrate.

1.1

Principle of Operation

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 reference, and the

dielectric constant of the medium being measured.

Assuming that the probe's mounting position and the

dielectric of the medium are fixed, the amount of capaci-

tance developed in any vessel becomes dependent upon

the probe's diameter and length. Adjusting the combina-

tion of the probe's diameter and length (and its proximity

to a ground reference) can generate the necessary capaci-

tance required by the electronic circuitry.

As the media rises and falls in the tank, the amount of

capacitance developed between the probe and the ground

reference also rises and falls. The capacitance-controlled

oscillator circuit mounted on the probe changes the

capacitance signal to a a digital wave form—proportional

to the change in level. The Series 804 amplifier then

converts this digital pulse signal into an isolated 4–20 mA

analog output signal.

1.2

Unpacking

Unpack the instrument carefully making sure all compo-

nents have been removed from the packing material.

Inspect all components for damage and report any con-

cealed damage to the carrier within 24 hours.

Check the contents of the carton making sure it agrees

with the packing slip and the purchase order. Verify that

the model number imprinted on the nameplate matches

the number on the packing slip and the purchase order.

Report any discrepancies to the factory. Check and record

the serial number for future reference when ordering parts.

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