Zero Signal Calibration - Honeywell 5701 Operating Instructions Manual

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
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 (
(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) Push the Engineering Card ZERO push-button and the Engineering
Card will automatically inhibit the selected control card to prevent
false alarms being generated. One of the following displays will be
shown on the selected control message display:
a.
b. A A A A
V V V V
c.
(4) Check that the selected control card digital display and
bar graph continue to display the current sensor signal
level.
Note: Pushing the
the control card to the selected mode without any
changes to the original zero reading.
(5) 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.
(6) When the message display shows
reading, push the
Indicates a stable gas reading.
Indicates a rising gas reading.
Indicates a falling gas reading.
push-button at this stage will return
push-button.
7 - 12
5701 Control System
) is illuminated.
, to indicate a stable