D12
EX-IR
Gas Transmitter with IR Smart Sensor
Dec 2019 ( 85-0004 Rev A)
15
E
LECTRICAL
C
ONNECTIONS
Board Stack
The transmitter consists of three PCB (printed circuit boards) composing the “stack” mounted into the
transmitter housing. From the top down, they are:
•
Display
•
CPU
•
Power Supply
The power supply board is held down in the bottom of the transmitter housing by hollow, hex standoffs
into which the other two boards (upper stack) plug into. To remove the upper stack, remove the housing
cover and grab the outer edges of the metal faceplate, just above the display board. Gently rock the stack
from side to side, while pulling up. When accessible, disconnect the ribbon cable and sensor terminal
block, and separate the stack.
Figure 7. Electronic board stack
Please be aware of the ribbon cables that connect to the stack. These cables are
just long enough to permit the stack to come free from the housing.