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DM330 Series - Magnetostrictive Level System User's Manual
2.4.1
Sizing of Stainless Steel Probe
Insertion Length is: Actual length from mounting point to
bottom of tank.
Overall length of probe is: Insertion Length plus 2 inches
(51mm) for Flange mounted probe, and Insertion Length plus
6 inches (152mm) for Compression Fitting mounted probe.
If the probe rests on the bottom of the tank, then the Active
Range of the probe is the Overall Length minus 10 inches
(254mm) [2" (51mm) Dead Band at bottom of the probe and
8" (203mm) for the Null Zone at the top of the probe].
The amount of Active Range in a tank will vary,
depending on the mounting style.
Stainless Steel probes are available in lengths up to 24 feet
(7.3m). Due to difficulty with shipping and installation on site,
it is recommend 16 to 18 feet (4.9 to 5.4m) as maximum length
for this style probe, if practical.
Most of the SS Probes are mounted with probe end resting
on bottom of the tank (for non pressurized tanks) or about
½" (12.7mm) from bottom (for pressurized tanks) and held in
position with compression fitting at top of tank. A 5/8" x ¾"
adjustable fitting is used to mount probe to a flange or adapter.
Minimum process connection depends on the diameter of float,
but it is suggested to use 2" NPT or larger.
If this compression fitting is used, fitting should be should be
positioned below "crimp" in tube or a minimum of 4 inches
(102mm) from the top of probe. Hand tighten fitting in a non-
pressurized tank. This will allow for a slight movement of probe
when tank expands or contracts. If tank is pressurized, fitting
must be tightened.
If a flange is being used, a "D" style connector can be specified to
thread probe directly into flange. This requires more accuracy
in specifying overall length of probe, but eliminates need for
compression fitting or adapter bushing. Contact factory if
Welded Flange connection is required.
12
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