Figure 3-13: Slg720 Coaxial Probe Assembly (Single Outer Tube Depicted) - Honeywell SmartLine SLG 700 User Manual

SLG720
The inner rod is comprised of 1.0m rod segments and one rod end. Depending on the
length of the probe there may be 0 to 6 1.0m rod segments. As with the rod probe, the rod
segments are attached to each other by way of a stud and lock washer, see Figure 3-13:
SLG720 Coaxial probe assembly (single outer tube
construction, a spacer is placed at each joint, retained by the lock washer.
If the coaxial probe is 2.0 m or shorter it will come with a single outer tube. If the probe
length is longer than 2.0 m, the outer tube will be supplied in segments. There are three
types of outer tube segments:

Starter segment: which has an internal thread to attach to the process connector.

Extension segment: which has external threads on both ends.

End segment: which has an external thread on one end.
Probes over 2.0 m in length will always have one "starter" and one "end" segment, along
with 0 to 2 extension segments in between. The tubes are connected to each other by way
of a threaded tube coupler. It is recommended to build the coaxial probe 2 m at a time.
That is, attach two 1.0 m rod segments together and slip an outer tube over the rod.
Repeat until the probe is fully assembled.
Refer to Figure 3-13: SLG720 Coaxial probe assembly (single outer tube depicted) for
the SLG720.
Probe Length ≤ 1.0m:
Step
Fully thread the nut onto the central conductor of the process connector. Place a
lock washer between the locknut and the rod segment and torque the nut against
the rod segment and lock washer to secure the connection.
1
Note: Tighten rod connection point to the following torque:
Slip the coaxial outer tube over the rod and spacer and tighten to the process
connector.
Note: Tighten connection point to the following torque:
2
It is recommended that a process compatible thread locking compound
(i.e. Loctite 242) be used on the outer conductor threaded joints.
Insert an end spacer into the end of tube. Align the holes in the end spacer with
3 the holes in the outer tube and insert the 2 locking pins. Refer to Detail B of

Figure 3-13: SLG720 Coaxial probe assembly (single outer tube depicted).

Page 52

SLG720 6.0Nm (4.4ft-lbs).

SLG720 30Nm (22ft-lbs).
SLG 700 SmartLine Level Transmitter User's Manual
depicted). In the coaxial probe
Action
Revision 8