Zero Signal Calibration - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_01-2010
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 (
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.
b.
c.
(5) Check that the selected control card digital display and
bargraph continue to display the current sensor signal
level.
Note: Pushing the
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 flow rate and for a time according to the selected
channels sensor instruction manual.
(7) When the message display shows
reading, push the
) and (
Indicates a stable gas reading.
Indicates a rising gas reading.
Indicates a falling gas reading.
push-button at this stage will return the control card
push-button.
7-10
5704 Control System
) push-buttons to select the
, to indicate a stable
ZERO