Trace Oxygen Transmitter
Maintenance
Teledyne
Analytical
Instruments
27
Any Insta-Trans can be converted to an Insta-Trace by substituting
the sensor and cell holder (see
Spare Parts Listing
in the Appendix).
The Insta-Trace system works by shielding the sensitive membrane
from air during the installation process. These special cells have an outer
membrane which seals the sensing membrane in a bath of N
2
until the
membrane is punctured during the installation. External gas can reach
the sensing membrane only after the external membrane is pierced. This
process prevents air from contaminating the sensor during installation
thus allowing rapid recovery to low ppm levels. For best results, the
proper installation must be followed.
To install the Insta-Trace:
The Insta-Trans transmitter must be purged with sample gas at a
flow rate of approximately 0.2 SCFH during installation.
Remove the Insta-Trace cell holder by unscrewing the collar (see
Figure 5-2).
Remove the Insta-Trace sensor from the double bags.
Remove the shorting plug from the rear of the sensor.
Install the sensor in the transmitter with the contact surface (two
concentric gold circles) facing up, and the membrane facing
down toward the cell holder.
Orient the cell holder to align the registration pin with the hole in
the cell holder.
Push the cell holder firmly in place while rotating the collar (see
Figure 5-2). The collar should be tightened finger-tight only.