4-44 | Model 920 Multi-Gas Analyzer
Setting Calibration Gas Timers
The analyzer uses three independent timers for automatic calibration.
Each timer establishes the duration for which a solenoid valve controlling
the Calibration gas mixture is energized during the Auto-Zeroes, Auto-
Spans, and Auto-Calibrations. The duration depends on the time required
for the Calibration gas mixture to reach the analyzer and to obtain a stable
reading.
Timer0, Timer1, Timer2
Timer0
sets the duration the analyzer Zero gas solenoid valve is turned
on during the Auto-Zero.
Timer1
and
Timer2
establish the duration
that Calibration gas mixtures are turned on during Auto-Span1 and
Auto-Span2.
Timer 2
(and
Auto-Span 2
) is used only when the optional O
2
Sensor
is used (
General Purpose applications/analyzers only
).
The duration for these timers can be set from 0–255 minutes in one-min-
ute increments. Set the duration to ‘
0
’ to turn the timer off (disable the
function). The average reading for Auto-Zero, Auto-Span1, and Auto-
Span2 will be taken during the last 25 percent of the timer duration.
The Timer must be assigned a value that allows the signals to be
stable during the last 25 percent of the countdown.
If a calibration gas is not used, the associated timer must be turned
Off.
Example 1:
To set
Timer0
to 2 minutes (allowing a 30-second averaging time) and
return to CAL mode normal display, press:
CAL>F3 0 Del 3 Ent Ent
Example 2:
Timer2
is not required for control of a calibration gas mixture. Its duration
must be set to ‘
0
’ (off). To set
Timer2
to ‘
0
’ and return to CAL mode nor-
mal display, press:
CAL>F3 2 Del 0 Ent Ent
NOTE
NOTE
Summary of Contents for 920
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Page 47: ...Specifications 2 19 Heater Plate ATEX and IECEx Certificates and Marking ...
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Page 53: ...Specifications 2 25 ATEX and IECEx certified Model 920 Analyzers are marked with this label ...
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Page 71: ...Installation and Start Up 3 11 Figure 3 4 Optical Bench Measuring Cell assembly ...
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Page 173: ...Controller User Interface 4 65 Figure 4 8 Customer signal connections ...
Page 187: ...Maintenance and Troubleshooting 5 11 Figure 5 1 Measuring Cell assembly ...
Page 262: ...A 2 Model 920 Multi Gas Analyzer Ribbon Cable Interconnect WX 102836 ...
Page 263: ...Appendix A Drawings A 3 GP Lower Enclosure to Electronics Wiring CE Analyzers WX 102810 ...
Page 264: ...A 4 Model 920 Multi Gas Analyzer Heater and Sensor Wiring GP Div 2 Analyzers WX 102851 ...
Page 265: ...Appendix A Drawings A 5 Heater and Sensor Wiring CE Zone 1 Analyzers WX 102852 ...
Page 266: ...A 6 Model 920 Multi Gas Analyzer Lower Cabinet Wiring CE GP Analyzers 120V 100 1341 3 ...
Page 267: ...Appendix A Drawings A 7 Lower Cabinet Wiring CE GP Analyzers 240V 100 1342 3 ...
Page 268: ...A 8 Model 920 Multi Gas Analyzer Signal Wiring PD GP Div 2 CE Zone 1 Analyzers WX 102815 ...
Page 271: ...Appendix A Drawings A 11 24V Power Supply DC Wiring CE Zone 1 Analyzers WX 102812 ...
Page 272: ...A 12 Model 920 Multi Gas Analyzer RS 232 Communications Cable Wiring 300 9480 ...
Page 273: ...Appendix A Drawings A 13 RS 232 RS 485 Module Wiring CE Zone 1 GP Div 2 Analyzers 100 2185 ...
Page 274: ...A 14 Model 920 Multi Gas Analyzer Microcontroller Board 100 0117 ...
Page 275: ...Appendix A Drawings A 15 Host Controller Board Display Interface 100 0138 ...
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