Honeywell 5701 Operating Instructions Manual page 188

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 7 - ENGINEER'S OPERATING
INSTRUCTIONS
(5) Apply the span gas at a flow rate and for a time according to the
selected channels sensor instruction manual.
Notes: 1. Apart from oxygen, every sensor should be zeroed before
being spanned. See Section 8.
2. Although a Span Gas as low as 15% of the fsd value of the
sensor may be used, it is recommended that a value of 40%
or above is used.
(6) When the message display shows
reading, push the
display
on the digital display while it carries out the following:
a. Adjusts its span calibration parameter to the new displayed
value, providing this is within the configured upper and lower
span signal limit values.
b. Set the last calibration date to the current date and reset the
calibration reminder if this is enabled.
c. Automatically return to the normal selected state, however, the
inhibit on the control card will remain active.
d. If the displayed value is outside the stored signal limits, display
an error message.
e. On control cards configured for catalytic sensor inputs, the present
sensor signal will be compared with that recorded when the
sensor was new. A warning will be displayed if the sensitivity of
the sensor has fallen to below 50% of its original value.
When the span gas has been removed and the sensor signal has
returned to normal, do not forget to return the control card to its uninhibited
state.
push -button. The selected control card will then
IMPORTANT
7 - 15
5701 Control System
to indicate a stable