INFICON Composer Gas Concentration Controller - Manual (Page 77)

3 - 15
IP
N 07
4-
28
9L
Composer Operating Manual
3.1.13.4 Operation (Bulk Flow)
The PROG key alternates the display between operate and program modes. In
operation there is no requirement for operator involvement once the
Composer’s pertinent parameters are set, see
section 3.1.13.5 on page 3-16 .
The 7-digit numerical display normally provides the measured concentration. It
is also possible to temporarily view other system and instrument parameters by
pressing one of the keys on the front panel. The parameters and keys are:
The front panel switches labeled START, HOLD, BYPASS and STOP are
inactive in this configuration. Internal or external control is toggled through
Input #4 as described in
section 3.1.13.3 on page 3-12 .
Calibration, if required, must be coordinated with the reactor’s controller to
establish a steady flow of pure carrier gas through the Composer Transducer.
Refer to
section 3.1.2 on page 3-1 and section 3.1.3 on page 3-2 for more
information regarding calibration.
When operating in the Bulk Flow configuration the control algorithm uses only
an Integral (I) term, unlike the PID (Proportional, Integral, Derivative) algorithm
employed in the Concentration Control configuration.
If the Composer is turned on (or has lost resonance) and the reactor’s controller
is asking for Composer control, the output will go into Kp control until “good”
measurements are obtained.
Table 3-4 Parameters and Keys
Key Parameter
A (6) Concentration (mole %)
S (9) Amplitude of the measured frequency (millivolt)
T (E) Temperature of Resonant Chamber (
0
C)
Q (0) Resonant Frequency’s quality factor
F (C) Current Resonant Frequency (Hz)
D (7) Current Bulk flow (sccm)
B (4) Current Bubbler Flow Read-back (sccm)
Y (5) Displays current warnings (if WARNING indicator is
illuminated) see manual
N (8) Current Bulk Flow Target (sccm)