INFICON Composer Elite Gas Concentration Monitor - Manual (Page 29)

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Composer Elite Operating Manual
Chapter 2
Installation
2.1 Composer Elite Installation Guidelines
The requirements and recommendations in section 2.1.1 , section 2.1.2 , and
section 2.1.3 must be reviewed and understood before Composer Elite is installed
as described by section 2.2, Composer Elite Installation, on page 2-8 .
2.1.1 Pressure, Temperature, and Tubing
2.1.1.1 Maximum Pressure
Reliable measurement of concentration to absolute pressures as low as 26.66 kPa
(200 Torr) requires relatively thin and flexible diaphragms to be used so that
sufficient acoustic energy may be transmitted.
There is a possibility that the diaphragms may destructively rupture if an absolute
pressure greater than 826 kPa (6200 Torr) is applied. A secondary containment
chamber is built into the Acoustic Sensor to prevent process gases from escaping
the Acoustic Sensor in the event of a diaphragm rupture.
CAUTION
Do not connect the Acoustic Sensor to process tubing
that can exceed an absolute pressure of
826 kPa (6200 Torr). Exposing the Acoustic Sensor to
excess pressure may cause catastrophic diaphragm
failure or may stretch the diaphragms, requiring on-site
reference zeroing (see
section 4.1.2 on page 4-1 ).
A certified rupture disk should be installed upstream of
the Acoustic Sensor to limit any possible over-pressure
to less than 826 kPa (6200 Torr).