ABB PGC5000 Generation 2 - Temperature Default; Unknown Peak; Valve on and Valve off; Air Purging

96 | PGC5000 GEN 2 | 892 J006 MNAH
5.5.15 Temperature default
This returns zone temperature to Setup Tab isothermal setpoint.
Table 5-17: Temperature default
Parameter
Range
Units
Description
User-definable
Text
Time Offset
0 to 14400
Seconds
Zone
Available from configuration
N/A
5.5.16 Unknown peak
This searches for an Unknown Peak in the specified area.
Table 5-18: Unknown peak
Parameter
Range
Units
Description
User-definable
Text
Time Offset Begin
0 to 14400
Seconds
Time Offset End
0 to 14400
Seconds
Detector Channel
Available from configuration
N/A
Peak Type
Positive/Negative
N/A
5.5.17 Valve on and valve off
Valve On and Valve Off control the operation of a selected valve. Each sequence should contain the
valve on and off functions required for the selected stream tap. The first Valve On time in an analysis
is used in all reports as the Sample Inject time.
Table 5-19: Valve on and valve off
Parameter
Range
Units
Description
User-definable
Text
Time offset
0 to 14400
Seconds
Valve Name
Available from configuration
N/A
5.6 Air purging
When an area classification indicates combustible gases or particles are present in the air, and you
have an analyzer containing a possible source of ignition located in this environment, the analyzer
may have an air purging system to reduce risk. The type of air purge used depends on the
classification of the analyzer and its environment; the analyzer is labeled accordingly.
DANGER – Serious damage to health / risk to life. This safety purge is part of the
basic design of the analyzer and must remain operational.
⎯ Y Purge reduces the internal classification of the analyzer from Division 1 or Zone 1 to Division
2 or Zone 2.
⎯ Z Purge reduces the internal classification of the analyzer from Division 2 or Zone 2 to
Nonhazardous/General Purpose.
⎯ X Purge reduces the internal classification of the analyzer from Division 1 or Zone 1 to
Nonhazardous/General Purpose.
5.6.1 Y and Z Purge
The analyzer has a standard air purge system which will reduce the internal classification by one level.
For a Division 1 internal classification, this purge system, labeled Y Purge, reduces the classification to
Division 2. For a Division 2 internal classification, this purge system, labeled Z Purge, will reduce the
classification to Nonhazardous/General Purpose. Since the Y and Z Purge systems are identical except
for nomenclature, the following explanation applies to both.