Operation & Installation Manual
SENTRY™ 1510
Section 2: Functional Description & Operation
11984 Rev 01 Page 1 of 2
2.1 Functional Description
Functional Components
The SENTRY 1510 is an automated pressure controller. It consists of a piston on a
spring, differential pressure transducer and a stepper motor. The interface
between the operator or the diffusion furnace and the SENTRY 1510 is the
Supervisor.
Piston
The piston provides the active control for the SENTRY 1510. It is suspended by a
spring and mechanically regulates exhaust pressure to a constant value. (For more
information on how the piston controls, see section 1, page 2.)
Differential Pressure Transducer
The differential pressure transducer is mounted on the SENTRY 1510 body and
measures the pressure differential between the clean room and the process tube.
Stepper Motor
The stepper motor is attached to the spring which suspends the piston. By moving
the stepper motor, the spring tension is changed, changing the pressure to which
the piston regulates. In other words, the stepper motor changes the set point.
Supervisor
The SENTRY Supervisor is separate from the SENTRY 1510 and provides an
interface between the operator or diffusion furnace controller, and the SENTRY
1510. The SENTRY Supervisor may be programmed manually, through the keypad,
through an RS422/485 interface or through an analog interface.
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