705-5202-21 datasheet(4/28 Pages) MAGNETROL

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P R O B E

O V E R V I E W

S I N G L E R O D P R O B E S

Single element GWR probes act quite differently from Coaxial and

Twin element designs. The pulses of energy develop between the

center rod and the mounting nut or flange; the pulse propagates

down the rod as it references its ground at the top of the tank. The

efficiency of the pulse “launch” is directly related to how much

metallic surface exists around it at the top of the vessel.

Figure 3 shows the single element design and how the pulse

expands into a teardrop shape as it propagates away from the top

of the tank (ground reference). This Single element configuration

is the least efficient of the three with minimum dielectric detection

approximately

r > 10. This dielectric performance improves con-

siderably (

r > 1.9) when the probe is installed between 2–6"

(50–150 mm) of a metal tank wall or in a cage/bridle. Because the

design is the “open”, it exhibits two strong tendencies. First, it is

the most forgiving of coating and buildup. (The PFA-insulated

probe is the best choice for severe coating). Secondly, it is most

affected by proximity issues. It is important to note that a parallel

metal wall INCREASES its performance while a singular, metal

object protruding near the probe may be improperly detected as a

liquid level.

Figure 3

Single Rod Probe

H Y G I E N I C

M O D E L

7 0 5

1⁄

" Hygienic Connection with bend

316 SS probes can be bent to avoid internal obstructions

such as agitator blades and spray balls, and to insure

lowest possible level detection.

3⁄

" Hygienic Connection without bend

0.25 inch diameter probes suitable for use in smaller

vessels where space is at a premium. Available in

lengths up to 72 inches.

Eclipse 705 is available with a deep drawn housing and a 0.4 µm

(RA 15) finished single rod GWR probe for use in ultra clean envi-

ronments.

For more details – refer to bulletin 57-110.

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