Ametek Drexelbrook ThePoint Series, Installation And Operating Instructions Manual, Page: 65 / 70

Appendix A
A1
Shortening or Lengthening Sensing Element
CAUTION:
The length of either
Flush Sensing
Elements or Insulated
Sensing Elements can
NOT be changed. Cable
Sensing Elements
can only be shortened.
Instructions are included
with each unit.
Note:
Any changes to probe
length after calibration
requires recalibration to
ensure proper operation.
Insulators
The Need
Sometimes your application calls for probe lengths
other than the standard 18-inch or longer insertion
lengths supplied. Shortening the sensing element is
quite simple and can be done in the field. Lengthening
the sensing element, however, is more difficult because
the metal rod, typically 304 SS or 316 SS, must be
welded.
Before making any Adjustments :
1) Read the following instructions thoroughly.
2) Remove power.
3) Disconnect the electronics.
4) Protect electronics from any static discharge.
5) Protect electronics from any heat.
Shortening
The bare metal center rod of the sensing element can
be shortened with a hacksaw. Be careful not to cut
either of the two insulators. See Figure on this page.
In applications using conductive or water-based
materials, shortening is not a problem. Leave a
minimum bare metal center rod length of two (2)
inches.
For dry granular materials, such as powder, sand,
corn, clinker, etc., you must leave a minimum bare
metal center rod length of eight (8) inches. Consult the
factory before shortening beyond this point.
Lengthening
To lengthen the sensing element, an extension rod can
be welded onto the end of the bare metal center rod.
Make sure that the extension rod is the same metal as
the sensing element.
An alternate option is to add a pipe coupling and a
section of metal pipe after threading the tip of the
sensing element. In this case, the metal pipe need not
be identical to the metal of the sensing element.
Center Rod
Insertion Length
(18" or 36" std.)
NOTE:
Cote-Shield
element must
NEVER be
modified.