Eclipse 705 Installation And Operating Manual page 5

MOUNTING
Twin rod (7MB) / Twin cable (7M5 - 7M7) GWR probes
Shortening of probe length
7MB probes can be shortened safely in the field. Make sure to re-install the bottom spacer for proper alignment and to adapt
the probe length/ 4-20 mA settings in the menu.
Twin cable probes can be safely shortened in the field using below procedure. Make sure to adapt the probe length / 4-20 mA
settings in the menu.
7M7/7M5 probe can be shortened
in field.
a. raise the weight (1) to expose the two
securing devices (2)
b. loosen the two #10-32 set screws (3)
on both securing devices using a
2.5 mm (3/32") hex wrench and slide
the securing devices off of the probe
c. slide the TFE weight off of the probe.
d. cut and remove the required cable (4)
length
e. remove 90 mm (3 1/2") of the rib
between the two cables
f. strip 16 mm (5/8") of coating from the
two cables.
g. slide the TFE weight back on to the
probe.
h. enter new probe length (cm or inches)
in software (See page 12, Item 9)
Cage GWR probe (7MG)
For cage/still well:
2": Ø 13 mm
(0.50") rod
Venting
holes
Bottom spacer
Customer or magnetrol
supplied cage/bridle or still well.
Overfill safe
All 7MG GWR probes are overfill safe. Overfill safe means
that the impedance match of the waveguide (probe) is
aligned from electronics down to the bottom of the GWR
probe. This allows the Eclipse 705 to measure up to the pro-
cess flange without any dead zone at the top of the GWR
probe.
1
13 mm Ø
(0.50")
3
4
2
Vent
For cage/still wells:
3": Ø 19 mm (0.75") tubing
4": Ø 25 mm (1.00") tubing
Bottom spacer
Metallic (or any conductive) obstructions in the tanks
Metallic obstructions have no influence on the measuring
performance of cage GWR probes.
Drain
Stillwell/cages
The cage GWR probe is a single rod GWR probe which
uses an existing or new cage, bridle or schedule pipe still-
well to re-create the same propagation of signal of a coaxi-
al GWR probe. Cage GWR probes are suited for 2", 3" or 4"
size diam. and use an impedance matching part that aligns
in the same way with the characteristic impedance of a
standard coaxial style GWR probe.
Shortening of probe length
Cage GWR probes can be easily shortened on site. Always
re-install the bottom spacer and adapt the new probe length
in the menu of the amplifier.
Note: Probe can be attached to the tank
bottom using the noose or the 13 mm Ø
(0.50") hole provided in the TFE weight.
7M7 GWR probes: cable tension should
not exceed 89 N
7M5 GWR probes: pull down force should
not exceed 1360 kg (3000 lbs)
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