G - Physics – 01 – N
Patent
G - Physics
01
N
73/0.5
G01N 27/18 (2006.01) B41F 23/04 (2006.01) F26B 21/06 (2006.01) F26B 25/00 (2006.01) G01N 25/54 (2006.01) G01N 27/16 (2006.01)
Patent
CA 1114637
ABSTRACT OF THE DISCLOSURE The LEL (Lower Explosive Limit) control includes a gas analyzer normally connected to receive sample gas from the evaporation enclosure of a press dryer section and which, during calibration, is sequentially connect- ed to first analyze solvent free gas and then gas having a known solvent content. Situated with the analyzer is a detector the resistance of which changes in proportion to the temperature within the flame cell of the analyzer. The detector forms a portion of a bridge circuit, which also includes a potentiometer. The output of the bridge is amplified, compared to a selected reference voltage and a signal representing the difference there- between is processed. The processed signal is combined with a signal representing the web speed to form a resultant signal to control a pneumatically operated damper in the enclosure exhaust conduit. Automatic calibration of the system is initiated periodically and takes place in two phases. During the first phase of calibration, the potentiometer is set in accordance with the difference between the amplifier output derived from analysis of the solvent free gas and a 0% reference voltage. During the second phase of calibration, the gain of the bridge output amplifier is set in accordance with the difference between the amplifier output derived from the analysis of the known solvent concentration gas and a full scale reference voltage. When calibration is taking place, the output of the comparison circuit is inhibited and the damper position is determined in accordance with the web speed alone. Emergency stop of the press occurs when the output of the amplifier exceeds a given level.
326864
Bobst Champlain Inc.
Smart & Biggar
LandOfFree
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