Agilent Technologies Helium User Manual page 106

Technical Information
Agilent part number R0305, an adapter from KF25 to 3/16" ID hose may be
purchased as part of the power probe kit, Agilent part number K95565305, the
entire power probe sniffer assembly. The molded plastic casing of the power probe
may be re-purposed by removing the valve and copper tubing, and inserting plain
1/8" ID hose into the shell of the gun. Remove the screws holding the case together
using a 7/64" Allen key.
Connecting from 3/16" tubing to 1/16" tubing may be accomplished using
McMaster-Carr part number 2808K105. 1/16" tubing should be used as the long
line sniffer in this application, not the thicker 3/16" ID tubing. The thinner tubing
gives a faster response time for a helium signal. 3/16" ID tubing may be purchased
as McMaster-Carr part number 6516T53. This tubing should only be used as an
adapter section or as use if not using a mass flow meter. The mass flow meter
restricts flow speed, requiring a thinner tube to be used for a quick response time.
1/16" ID tube may be purchased as McMaster-Carr part number 6516T62.
Since a thin hose is required without a fine metering valve on the top of the system,
if the operator already has a power probe handle that is not in use, the gun portion
of the probe may be disassembled, striped of all valves and copper tubing, and
reassembled with a 1/16" hose inside. It is important, however, not to have another
metering valve in series above the mass flow meter. This is for optimizing response
time. Of course, this only provides a convenient handle. A naked hose may be used
for sniffing.
Figure 53 Re-purposing a Power Probe for Thin Hose Without a Regulator
106 Agilent Helium Leak Detector User Manual