Honeywell 5704

7-10
MAN0448_Issue 13_01-2010 5704 Control System
005704-M-5001 A03249
CHAPTER 7 - ENGINEER'S OPERATING
INSTRUCTIONS
8. ZERO SIGNAL CALIBRATION
Toselectthezero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 ZERO push-button and the Engineering
Card will automatically inhibit the selected control card channel to
prevent false alarms being generated. One of the following displays
will be shown on the selected control message display:
a.
Indicates a stable gas reading.
b.
Indicates a rising gas reading.
c. Indicates a falling gas reading.
(5) Check that the selected control card digital display and
bargraph continue to display the current sensor signal
level.
Note: Pushing the push-button at this stage will return the control card
to the selected mode without any changes to the original zero
reading.
(6) Ensure the selected channel sensor is in a gas free atmosphere. If
requiredapplyzerogas,normallyairnotcontainingthegastobe
measured,attheowrateandforatimeaccordingtotheselected
channels sensor instruction manual.
(7) When the message display shows , to indicate a stable
reading, push the
push-button.
ZERO