CMSS 904 Probe Holder
The CMSS 904 Probe Holder provides a rigid mount with
provision for external gap adjustment. Conduit may be
readily mounted at the cable exit. The CMSS 904 provides
0.75” (19 mm) of adjustment range after installation; a set
screw securely locks the adjustment. It is recommended
that probes be ordered with a case length of 1.2 inches or
use the standard reverse mount probe.
Figure 3-5. By trimming stinger, working range of long CMSS 904 is
4.00” to 7.75” (100 mm to 194 mm) from mounting surface to probe
tip (combination of stinger length and adjustment inside threaded
stock); range of short CMSS 904 is 2.50” to 4.75” (63 mm to 119
mm).
Probe adapter 1/4–28 to 3/8–24 threads, part number
CMSS 30221900 is required when using CMSS 61 and
CMSS 65 Eddy Probes with the larger diameter stringers.
“Stingers” may be cut down in the field within the indicated
ranges.
Installation instructions for
CMSS 904 Probe Holder
Figure 3-6. CMSS 904 Probe Holder.
Section 3 – Probe installation
3-3
1. Cut threaded extension of stinger (part 2) to desired
length, deburr, and chase threads using a 1/4–28 or
3/8–24 tap.
2a. Armored probe installation.
Thread probe through threaded extension. The probe
should screw in easily. It may be necessary to chase
thread on probe using a 1/4–28 or 3/8–24 die.
Thread probe through the end exposing the majority
of the threads, apply Loc-Tite and thread probe back
to desired position. Lock probe into place with the jam
nut (1).
Caution: The probe must turn freely. Forcing the probe
can destroy both the probe and the holder.
2b. Non-armored probe installation.
Push connector through threaded extension (2) from
small end, apply Loc-Tite, screw probe into extension
to desired length and lock in place with jam nut (1).
3. Thread UNY fitting (3) into 1/2” (12.7 mm) NPT
machine case. Tighten firmly.
4. Thread assembled unit through UNY fitting until probe
tip is gapped at 0.040” (1 mm) or the driver output
reads -8 Vdc. (There must be -24 Vdc applied to the
driver.)
Note: To oil-proof a CMSS 904 Probe Holder, apply
Loc-Tite Pipe thread sealant liberally to both pipe
threads and machine threads of probe holder
during installation. This is good for temperatures
from -65 to +300 °F (-18 to +149 °C). Cure
time is 48 hours, but this can be accelerated
significantly using Loc-Tite “Klean N’ Prime” or
Loc-Tite “Locquic Primer NF.”
5. Tighten the set screw on the UNY fitting (3) when
probe is properly gapped.
6. Attach UNY–UNF (4 and 5) to conduit and fasten
conduit securely to (3) or attach a conduit for probe to
extension cable connection.
7. Recheck gap voltage to assure that securing conduit (4
and 5) has not affected gap setting.
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