Operating instructions

3 - 10
CHAPTER 3 CONTROLS AND FACILITIES
MAN0443.P65 Issue 13 Aug 04 5701 Control System
05701-M-5001 A02279
2.2.3 Digital Display
The digital display is a four character, seven segment display which
provides either an indication of the sensor gas reading or a value relating
to a function selected from the Engineering Card.
Depending on the sensor range and the configuration setting, the digital
display shows a gas value to either no decimal place (the default setting)
or to one decimal place.
2.2.4 Message Display
The message display consists of a four character, 14 segment display
which provides intelligent reporting of the sensor status or information on
a selected engineering function. For control cards fitted with the high
integrity relay outputs performing master, zone or voted alarms, the alarm
state will also be indicated as follows:
BEAM - Beam Blocked Alarm
MSTR - Master Alarm
ZONE - Zoned Alarm
VOTE - Voted Alarm
In the case of an Update alarm the cause of the update is indicated as
follows:
-FT- - Fault Alarm
-IN- - Inhibit Alarm
-A1- - A1 alarm
-A3- - A2 alarm
-A3- - A3 alarm
-ST- - STEL alarm
-LT- - LTEL alarm
-RT- - Rate alarm
2.2.5 Icon
The icon provides a simple indication that the display is functioning and
changes when the channel card is selected for operation with the
Engineering Card.
Normal Operation Selected