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804-R010-330 Datasheet(PDF) 4 Page - Magnetrol International, Inc. |
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804-R010-330 Datasheet(HTML) 4 Page - Magnetrol International, Inc. |
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4 / 32 page  50-604 Kotron Model 804 Sentinel II RF Level Transmitter 1 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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