(8) The selected control card will display oooo on the message display
while the Control Card carries out the following:
a. Zeroes itself at the current sensor signal, providing this is within
theconguredupperandlowerzerosignallimitvalues.The
control card will then automatically return to the normal selected
state.
b. If the signal is outside the stored signal limits an error message
will be displayed on the selected control card display.
c. Automatically return to the normal selected state, however, the
inhibit on the control card channel will remain active.
(8) If the Span Signal Calibration (Section 9) is not to follow this
procedure, remove the inhibit.
9. SPAN SIGNAL CALIBRATION
Note: If a new sensor is being calibrated for the rst time, use the 1st
Span procedure in Section 10.
To select the span operation, proceed as follows:
(1) Plug the Engineering Key into the Engineering Card front panel
socket and check that the Unlocked LED ( ) is illuminated.
(2) Push and hold the required control card RESET/SELECT push-
button for approximately 1.5 seconds and check that the selected
control card indicates it has been selected by displaying the select
icon.
(3) Use the Engineering Card (
) and ( ) push-buttons to select the
required channel.
(4) Push the Engineering Card SPAN push-button and
the selected control card channel will automatically
be inhibited and one of the following displays will be
shown on the control card message display:
a.
Indicates a stable gas reading.
b.
Indicates a rising gas reading.
c.
Indicates a falling gas reading.
SPAN
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