Kenco-engineering KMD Transmitter Bedienungsanleitung PDF herunterladen (Seite 4)

3. TRANSMITTER FEATURES

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• CSA approved explosion-proof enclosure

• Digital Display for zero and span settings and readout

• Readout is updated every 3 seconds

• Readout available as a % of span, a 4-20 mA output or any unit of

measure

• Adjustments may be made using a HART ® hand held communicator

• Repeatability is .005% full span or .005 inches

• Temperature range: - 40°F to 300°F (call KENCO for higher temperature

requirements)

• No maintenance required

• Immune from electrical and mechanical noise

4. PRINCIPLE OF MAGNETOSTRICTION

The level transmitter is composed of 2

concentric members. The outermost

member is a protective 316 stainless

chamber that withstands aggressive

environments. Inside of the chamber

is the waveguide, a formed element

constructed of a proprietary

magnetostrictive material.

A pulse is induced in the waveguide by

the momentary interaction of 2

magnetic fields, one from an electric

current pulse launched along the

waveguide and the other from the

magnets inside the float. This

interaction produces a strain pulse

that travels along the waveguide. The

location of the magnet inside the float

is determined by measuring the

elapsed time between the launching of

the electronic pulse and the detection

of the strain pulse that travels along

the waveguide. The location of the

magnet inside the float is determined

by measuring the elapsed time between

the launching of the electronic pulse

and the detection of the strain pulse by

the sensor head. The time period

measurement is used to produce an

output reading of the float location.

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