11984 Rev01 Page 5 of 15
3.1 Installation
Figure 3-4 : Facility Nitrogen Swagelock connection: 35-100 psi is required for
proper operation of the SENTRY 1510.
Teflon tubing (ID 0.187, OD 0.250), cut to a length of 10 feet, is supplied with the
controller and should be used to connect the barbed fitting to the point on the
furnace where the process pressure will be sensed. The SENTRY 1510 uses a
nitrogen purge of 0.1 l/min in the transducer sense tube to prevent any back
migration of corrosive vapor, and to evaporate any condensation. The SENTRY
1510 transducer is factory calibrated to compensate for the nitrogen purge in a
sense tubing length of 10 ± 5 feet. If the length of the sense tube is to be modified
by more than five feet then the transducer will need to be recalibrated. (See
section 5, page 2.) for the calibration procedure.)
It is recommended that the sense location for sensing the process pressure be as
close to the quartz exhaust port as possible. For example, a Teflon block may be
mounted on the quartz exhaust port that would accommodate a barbed fitting or a
compression fitting for the sense tube.
Connecting the Facility Nitrogen to the SENTRY 1510
The SENTRY 1510 exhaust controller requires a facility nitrogen supply of ap-
proximately 18 liters/minute at 35 to 100 psi. A ¼ inch Swagelok fitting is provided
on the side of the SENTRY 1510 just above the intake. The SENTRY 1510
contains its own internal pressure regulators for the three purposes within the
design: 16.3 liters/minute for piston bias flow, 1.6 liters/minute to supply the air
bearing between the piston and cylinder and 0.1 liters/minute for the transducer
purge.
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