Honeywell 5704 Operating Instructions Manual page 61

MAN0448_Issue 13_2010
005704-M-5001 A03249
CHAPTER 3 CONTROlS AND FACIlITIES
3.3.11 SPAN Push-button
The SPAN push-button can only be used when the Engineering Key is
fitted 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 fitted to the Engineering Card and is used to calibrate the span
point of a new catalytic sensor fitted 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 fitted 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 configured relay output alarm functions.
Inhibit can only be used if the Engineering Key is fitted to the Engineering
Card, however, if the Engineering Key is subsequently removed the
selected control card channel remains in the inhibit mode.
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5704 Control System