Technical Note: 10000041
Assembly & Disassembly of Maxtek Sensor Head/Feedthrough
BNC Termination of Electrical ConnectionParts
BNC Connector (P/N 051-0059)
Barrel Nut (P/N 123414)
Cap and Fitting with Plastic Ferrule (P/N 123413)
Metal Ferrule (P/N 059-0394)

Tools
Hex Wrench (.035 in)
Two Open-end Wrenches (7/16 in)Open-end Wrench (1/2 in)Soft-nose Pliers
ForcepsHeat-shrink Tubing (3/4 in long x 1/8 in diameter)
Heat Gun
Silver SolderOhmmeter

BNC Termination Disassembly
1. Remove the Cap from the Fitting by holding the Fitting stationary with a wrench andturning the Cap counter-clockwise with a wrench. (See Figure 1)
2. Turn the Hex set screw on the Fitting counterclockwise using a .035 in hex wrench until
the screw is loose but do not remove the screw.
3. Remove the Fitting from the Barrel Nut by holding the Barrel Nut stationary with a wrench
and turning the Fitting counter-clockwise with a wrench.
4. Remove the Barrel Nut from the BNC Connector by holding the BNC Connector stationary
with soft-nose pliers and turning the Barrel Nut counter-clockwise with a wrench.
5. Remove the heat-shrink tubing from the BNC Connector and unsolder the BNC Connector
from the wire.

BNC Termination Assembly
1. Turn the Fitting clockwise into the Barrel Nut and tighten with a wrench.
2. Place the Ferrules inside of the Cap and turn the Cap clockwise into the Fitting but do nottighten yet.
3. Slide the assembled Cap, Ferrules, Fitting, and Barrel Nut over the tube. (See Figure 1.)
4. Slide approximately 3/4 in of heat-shrink tubing onto the tube. (See Figure 2.)
5. Push the insulation into the tube until it meets resistance. With approximately 1/8 in. ofwire exposed, clamp the insulation to the wire using forceps. (See Figure 2.)
6. Check for isolation between the wire and the tube by placing an ohmmeter lead on thetube and a lead on the wire. The resistance between wire and tube must not be less than
20 M .
7. Solder the wire to the terminal of the BNC Connector using silver solder.
8. Remove the forceps and slide the heat-shrink tubing over the BNC Connector terminal.
Use a heat gun to shrink the heat-shrink tubing.
9. Hold the BNC Connector stationary with soft-nose pliers. Turn the Barrel Nut clockwise
onto to the stationary BNC Connector and tighten with a wrench.
10. Tighten the Hex screw on the Fitting.
11. Hold the Fitting stationary with a wrench and turn the Cap clockwise until tight. If theferrule is plastic, tighten the Cap until hand-tight to avoid crushing the ferrule. If the ferruleis metal, turn the Cap until hand-tight and then turn the Cap an additional 1/8 turn with awrench.
12. Verify the Hex screw on the Fitting is still tight.
13. Verify isolation between the wire and the tube (resistance must not be less than 20 M ).
(See Figure 3)

Figure 1: Assembly Exploded View

3. Slide heat-shrink tubing over BNC terminal

2. Silver Solder
1. Push insulation into tube
and clamp to wire

Figure 2: Soldering the BNC Connector

Figure 3: BNC Continuity Check

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Maxtek Sensor Head/Feedthrough Termination of Electrical Connections
10000041
3/21/2012
ASF-140/ASF-141, BDS-250/BDS-251, BSH-150/BSH-151, DSH5P1, SF-120, SH101/SH-102
Thin Film / Vacuum
Originally released as THIN FILM TECHNICAL NOTE V 141