Magnetrol 2xx Specifications download pdf (Page 24)

46-648 Jupiter Magnetostrictive Transmitters

2.0 Reference Information

This section presents an overview of the operation of the

Jupiter magnetostrictive transmitter, information on trou-

bleshooting common problems, listing of agency

approvals, lists of replacement and recommended spare

parts, and detailed functional, performance and physical

specifications for the instrument.

2.1 Description

The Jupiter is a two-wire, 24 VDC level transmitter based

on the concept of magnetostrictive level measurement

technology.

The Jupiter electronics are housed in an ergonomic hous-

ing of two tandem compartments angled at a 45° angle for

ease of wiring and calibration. The electronics compart-

ment is permanently attached to the probe assembly via an

explosion-proof seal.

2.2 Theory of Operation

Magnetostrictive level sensors are based on "time-of-flight"

technology.

Permanent magnets contained within a float device tracks

the process liquid as it changes level. The Jupiter probe is

fixed within close proximity to this magnetic field. A short

current pulse is then applied to a specially designed wire

alloy contained within the probe. The interaction of the

current pulse and magnetic field cause distortion in a small

section of the wire alloy. This in turn creates a vibratory

disturbance which begins to travel through the wire at a

very constant rate of speed. The disturbance is later detected

via a sensing device at the top of the probe and sent to the

electronics unit where it is filtered and amplified.

Extremely accurate level measurement can thus be

obtained precisely measuring the elapsed time between the

current pulse (start), and the returned pulse (stop). The

Jupiter electronics module processes these signals, and then

performs various mathematical operations in order to pro-

vide the user with an analog and/or digital representation

of the liquid level.

D EINUSA

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Magnetrol 2xx Specifications Page 24