Orion Instruments Eclipse 705 - Manual (Page 47)

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3.3.3.3 Model 705 (Single Rod Application)
• Nozzles
Nozzles can create false echoes that can cause diagnostic
messages and/or errors in measurement. If EOP HIGH
or EOP LOW is displayed when first configuring the
instrument:
1. Ensure the PROBE LENGTH as entered in the software
is equal to the actual probe length as noted on the name-
plate. This value must be changed if the probe is cut
shorter from the original length.
2. Increase the Blocking Distance value until the message is
eliminated; 20mA point may need to be lowered.
3. Increase the DIELECTRIC RANGE a small amount to
aid in reducing echoes in nozzle. Increasing the
DIELECTRIC setting reduces the gain, which may
cause instrument to lose level of lower dielectric media;
consult factory.
• Obstructions
If the level reading repeatedly locks on to a specific level
higher than the actual level, it may be caused by a metallic
obstruction. Obstructions in the vessel (e.g., pipes, ladders)
that are located close to the probe may cause the instrument
to show them as level.
1. Refer to the Probe Clearance Table
2. Increase the DIELECTRIC RANGE a small amount to
aid in reducing echoes in nozzle. Increasing the
DIELECTRIC setting reduces the gain, which may
cause instrument to lose level of lower dielectric media;
consult factory.
• Coating/Buildup
The Model 705 and Single Rod probe were designed to
operate effectively in the presence of media building up.
Some expected error may be generated based upon the
following factors:
ΠDielectric of the media that created the coating
 Thickness of the coating
Ž Length of the coating above the present level
• Stratification/Interface
The Model 705 and Single Rod probe should not be used
in applications where media can separate and stratify creat-
ing an interface application (e.g., water over oil). The cir-
cuitry will detect the lower level—the higher dielectric
medium (e.g., the water level).
Obstruction
Nozzles
• 2" Diameter minimum
• Ratio of Diameter:
Length should be >1:1
• Do not use Pipe Reducers (restriction)
Coating
Buildup
Distance
to Probe Acceptable Objects
<6" Continuous, smooth, parallel
conductive surface, for example
a metal tank wall; important that
probe does not touch wall
>6" <1" (25mm) diameter pipe and
beams, ladder rungs
>12" <3" (75mm) diameter pipe and
beams, concrete walls
>18" All remaining objects
Œ

Ž
57-600 Eclipse ® Guided Wave Radar Transmitter
PROBE CLEARANCE TABLE