MERIDIAN
UNIVERSAL GAS DETECTOR
MAINTENANCE
7-24
USE AND DISCLOSURE OF DATA
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7.3.12 Re-mapping the Sensors
When the sensor mapping is changed from its initial mapping, the LCD displays an error message and the Fault
LED flashes. The sensors need to be changed back to their initial mapping. For example, Sensor1 was initially a
Cat-Bead, Sensor2 was an O
2
, and Sensor3 was a E-Chem. Later the sensors were changed by mistake, and
you want to change them back. Sensor1 is a O
2
, Sensor2 is a E-Chem and Sensor3 is a Cat-Bead.
1. Change the access level to system manager (refer to
Section 5.1.7 Configuring the User Access Menu
).
2. Set
Sensors Enable
to
0
and save.
NOTE: You do not need to remove power to install/replace sensors. Follow local procedures and
safety regulations.
WARNING:
ALARM SETTINGS ARE STORED IN THE SENSOR. CHANGING SENSOR
MAPPING CHANGES ALARM SETTINGS. VERIFY PRIOR TO PROCEEDING. FAILURE TO DO
SO COULD RESULT IN INJURY OR DEATH.
NOTE: Removing a sensor creates a fault condition (FLT LED blinks, error message alternates
between SYSTEM FAULT and SENSOR OFFLINE on the LCD). To avoid this fault condition:
• from the main menu, enter
ACCESS
;
• take sensor offline;
• save the change;
• remove the sensor.
This is temporary, as the device automatically reverts to the sensor being online.
WARNING:
THE ORDER OF SENSOR INSTALLATION DEFINES THE CORRESPONDING
LOOP. FOR EXAMPLE, THE DEVICE ASSIGNS THE 1
st
SENSOR INSTALLED TO LOOP1, THE 2
nd
SENSOR TO LOOP2, THE 3
rd
TO LOOP3. YOU MUST CONFORM TO THE SENSOR TYPE
RULES PER SENSOR POSITION IN THE SYSTEM CONFIGURATION AS OUTLINED IN
Hard Wired Configurations – Sensor Types Supported for 3 or 4-Wire
. VIOLATING, OR ARE
ATTEMPTING TO VIOLATE, SENSOR CONFIGURATION RULES AUTOMATICALLY PLACES THE
DEVICE INTO AN IMMEDIATE FAULT MODE. THIS IS AN ILLEGAL CONFIGURATION (NOT
INTRINSICALLY SAFE). FAILURE TO ADHERE TO THE CORRECT SENSOR MAPPING COULD
RESULT IN INJURY OR DEATH.
NOTE: System manager access level is required to perform this operation.
