Description
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.
IMPORTANT
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.FIRST TIME SPAN SIGNAL CALIBRATION
When the 1st SPAN push-button is pressed, the operation of the selected
control card is similar to when the SPAN push-button is pressed.
To carry out the first time span calibration, proceed as indicated in
Section 9 Steps (1) to (6) but push the 1st SPAN push-button.
Note: 1. In Step (6) when the span calibration is updated, the new
sensor calibration date and the last sensor calibration date
will both be set to the current date.
2. On control cards configured for catalytic sensor inputs, the
sensor span signal value is recorded as the new sensor
value. This value will be used to provide sensor life monitoring
data by comparison with subsequent values obtained during
later calibrations using the SPAN button.SENSOR SIGNAL MONITORING
The operation of the SIGNAL push-button allows the monitoring of the
selected channels sensor signal value. The displayed parameter is
dependent upon the type of sensor drive module fitted to the selected
channel card.
To enter the sensor signal monitoring operation, proceed as follows:
(1) Push and hold the required channel card RESET/SELECT pushbutton for approximately 1.5 seconds until the selected icon appears
on the channel display.
(2) Push the SIGNAL push-button and the selected channel card display
will indicate the sensor signal. The displayed value will depend on the
type of sensor drive module fitted to the channel card as follows:
a. Catalytic Sensor Drive Module
The display will show the live bridge voltage
measured between 01 and 02 in mV. 02 is the
centre point of the second half of the Wheatstone
bridge which is on the channel card.
b. 4 - 20mA Sensor Drive Module
The display will show the live sensor loop current
in mA.
(3) No alterations can be made to the above readings
and pressing either the or push-buttons will
return the selected control card to the selected mode.
