705-5202-21 datasheet(2/28 Pages) MAGNETROL

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Air

εε

r = 1

Reference

signal

Time

Upper level

signal

> 2"

(50 mm)

< 2" (50 mm)

Interface

level signal

Interface Level

Overall Liquid Level

Low dielectric medium

(eg. oil,

εε

r = 2)

high dielectric medium

(eg. water,

εε

r = 80)

Reﬂected

Pulse

Initial

Pulse

Air

εε

r = 1

Liquid

εε

r > 1.4

for coaxial probes

Transmitted

Pulse

Bulk Solid Level

Reﬂected

Pulse

Initial

Pulse

Air

εε

r = 1

εε

r > 1.9 for twin

ﬂexible probes

Transmitted

Pulse

O V E R A L L L E V E L

Eclipse Guided Wave Radar is based upon the technolo-

gy of TDR (Time Domain Reﬂectometry). TDR utilizes

pulses of electromagnetic energy transmitted down a

wave guide (probe). When a pulse reaches a liquid sur-

face that has a higher dielectric constant than the air (

of 1) in which it is traveling, the pulse is reﬂected. The

transit time of the pulse is then measured via ultra speed

timing circuitry that provides an accurate measure of the

liquid level.

I N T E R F A C E L E V E L

The Eclipse Model 705 is capable of measuring both an

upper liquid level and an interface liquid level. Even after

the pulse is reﬂected from the upper surface, some of the

energy continues down the GWR probe through the

upper liquid. The pulse is again reﬂected when it reach-

es the higher dielectric lower liquid. It is required that the

upper liquid has a dielectric constant between 1.4 and 5,

and the lower liquid has a dielectric constant greater than

15. A typical application would be oil over water, with

the upper layer of oil being non-conductive (

≈ 2.0),

and the lower layer of water being very conductive

(

≈ 80). The thickness of the upper layer must be > 2"

(50 mm). The maximum upper layer is limited to the

length of the GWR probe, which is available in lengths

up to 40 feet (12 meters).

E M U L S I O N L A Y E R S

As emulsion layers can decrease the strength of the

reﬂected signal, the Eclipse Model 705 should only be

utilized in those interface applications that have clean,

distinct layers. Contact factory for application assistance.

T E C H N O L O G Y

705-5202-21 Datasheet(PDF) 2 Page - Magnetrol International, Inc.

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