5 sensor installation, 1 vacuum considerations – INFICON Composer Gas Concentration Controller User Manual
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Composer Operating Manual
The parameters necessary for tuning the concentration maintaining Control
Loop are readily visible and alterable through the LCD display or the optional
Monitor software. In the absence of the optional software, these parameters
may be configured permanently at the time the Instrument System is installed
through a temporary digital setup link using the Setup software (see
). There are three parameters to optimize. It is suggested that the
tutorial in
section 3.2.1, Control Loop Fundamentals — Concentration Control,
, be consulted. The appropriate control parameters are available
for direct entry with the optional LCD display version.
The Instrument System may be switched to active control by toggling to ground
digital input #4, pin 21 on the SYSTEM I/O connector (see
). When Input #2 is toggled to the ON (to ground) state, the control
voltage remains at the last controlled voltage. The control voltage may also be
set to zero by activating input #3, pin 20 on the SYSTEM I/O connector. In
addition, instead of setting the flow to zero, the system may be set to maintain
bypass flow by setting SW#5 on CFGR2 and activating input #5 on the
SYSTEM I/O connector. Movement between the instrument’s states is directly
accessible from the LCD front panel.
1.10.4.4 Basic Connection To A Reactor—Bulk Flow Control Mode
1.10.5 Sensor Installation
The following sections should be followed when installing the sensor.
1.10.5.1 Vacuum Considerations
This Instrument System works best when the pressure in the Reactor’s Delivery
Lines range from 70 to 1000 Torr (9.33 to 133.3 kPa).
NOTE: It is suggested that the Transducer be installed after any Dilution Flow
gas is added and prior to any Back Pressure Controller. This creates
the environment with the most stable pressure and flow conditions for
best instrument stability. Positioning the Transducer after the Dilution
Flow also simplifies calibration. It is now easy to flow only pure carrier
gas through the Transducer and consequently very easy to set the
Reference Zero.
In order to optimize performance at low pressures, the tubing directly
connected to the Transducer’s Resonant Chamber has an inner diameter of
0.058” (0.147cm). The balance of the Reactor’s tubing may be of any other
appropriate size without degrading performance.