Honeywell 5704

3-20
CHAPTER 3 CONTROLS AND FACILITIES
MAN0448_Issue 13_2010 5704 Control System
005704-M-5001 A03249
3.3.11 SPAN Push-button
The SPAN push-button can only be used when the Engineering Key is
ttedtotheEngineeringCardandisusedtocalibratethespanpoint
of the selected control card channel.
3.3.12 1ST SPAN Push-button
The 1ST SPAN push-button can only be used when the Engineering
KeyisttedtotheEngineeringCardandisusedtocalibratethespan
pointofanewcatalyticsensorttedtoaselectedcatalyticcontrolcard
channel.
This function is used to provide an indication, in conjunction with
subsequent normal span adjustments, of the output sensitivity of a
catalytic sensor and to automatically indicate poisoning or loss of sensor
performance.
3.3.13 CLOCK Push-button
When the CLOCK push-button is operated, the display of the selected
control card provides an indication of the time and date of the rack
clock.
The rack clock is located in the Engineering Card, however since the
Engineering Card has no display, a control card must be selected to
enable the time and date to be displayed. It does not matter which
control card or channel is selected.
IftheEngineeringKeyisttedtotheEngineeringCard,thetimeand
datecanbeadjusted.
3.3.14 INHIBIT Push-button
When the INHIBIT push-button is operated, the selected control card
channel is placed in the inhibit mode. This prevents the operation of
anyconguredrelayoutputalarmfunctions.
InhibitcanonlybeusediftheEngineeringKeyisttedtotheEngineering
Card, however, if the Engineering Key is subsequently removed the
selected control card channel remains in the inhibit mode.