User guide

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PN 074-566-P1B
Composer Elite Operating Manual
Chapter 1
Introduction
1.1 Introduction
Composer Elite™ is designed to measure the precursor concentration of binary
gases. It is optimized for operation at pressures as low as 26.66 kPa
[200 Torr] and temperatures as high as 65°C. The Composer Elite System
provides unsurpassed precision and reproducibility when measuring small
concentrations of heavy molecular weight components in a lower molecular weight
carrier gas.
1.1.1 Description of the Composer Elite System
The Composer Elite System consists of:
 A Sensor Control Unit which sends/receives electrical signals to/from the
Acoustic Sensor. The Sensor Control Unit provides an LCD display and
interface for user interaction (see Figure 1-1).
 An Acoustic Sensor which interfaces to the process gas tubing and forms the
physical basis for the speed of sound measurement (see Figure 1-1). Two
versions of Acoustic Sensor are available:
 Standard Acoustic Sensor, for use with hydrogen or helium carrier gas at
flow rates up to 2000 sccm, or for carrier gases of any molecular weight at
flow rates up to 1000 sccm.
 High Flow Acoustic Sensor, for use with nitrogen carrier gas or a higher
molecular weight carrier gas, at flow rates between 1000 and 2000 sccm.
 An Interconnect Cable which connects the Sensor Control Unit and
Acoustic Sensor.
 An optional 24 V(dc) Power Supply which provides power to the
Sensor Control Unit.
 Windows
®
Composer Elite Multi-Sensor Software, for system operation and
setup through RS-232C or DeviceNet. See Chapter 6, Composer Elite
Multi-Sensor Software.
Figure 1-1 Sensor control unit (left), acoustic sensor (right)