MERIDIAN
UNIVERSAL GAS DETECTOR
MAINTENANCE
7-10
USE AND DISCLOSURE OF DATA
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7.3. Maintaining the Device
Recommended Maintenance Matrix
details the recommend maintenance item for the device.
Table 7-6: Recommended Maintenance Matrix
Item
Activity Frequency
Details
Sensor
Replace
Periodic
See
Section 7.3.1 Replacing a Sensor
E-Chem Sensor
Change
Section 7.3.2 Changing the E-Chem Sensor’s Range
Combustible IR Sensor
Change
As needed
Section 7.3.3 Selecting the Combustible IR Sensor’s
Intrinsically Safe (IS) Bar
-
rier PCB
Replace
As needed
Section 7.3.4 Replacing the Intrinsically Safe (IS) Bar
Power Supply PCB (3-4
Wire)
Replace
As needed
Section 7.3.5 Replacing the Power Supply PCB (3 or
Power Supply PCB (2
Wire)
Replace
As needed
Section 7.3.6 Replacing the Power Supply PCB (2-
4-20mA Loop Trimming Adjustment
Initial
installation &
As needed
Section 7.3.7 Trimming the 4-20mA Loop
LCD PCB/CPU PCB
Replace
Section 7.3.8 Replacing the LCD PCB/CPU PCB
Terminal/Relay/
MODBUS RS-485 PCB
Replace
As needed
Section 7.3.9 Replacing the Terminal/Relay/MOD
Meridian NPT Ex Seal
Replace
Section 7.3.10 Replacing the Meridian NPT Ex Seal
Meridian Detector Body
Assembly
Replace
As needed
Section 7.3.11 Replacing the Meridian Detector
Sensor Mapping
Section 7.3.12 Re-mapping the Sensors
Sensor Fault