ABB LWT300 series User Manual page 29

WARNING
Securing housing cover in flameproof/explosion proof areas
Both sides of the electronics housing feature a M4 hex head locking screw on the
bottom side.
To secure a housing installed in a hazardous location:
1 Tighten the housing covers by hand.
2 Turn both locking screws counterclockwise until their head stops at the housing
cover.
3 Once installation is complete, make sure that electrical ports are properly sealed against all types of
fluid ingress (rain and/or corrosive vapors or gases) and verify the following:
– Cover installations;
– Locking screw tightness;
– Process connection;
– Electrical connection.
4 Power up the instrument by switching on the circuit breaker.
At power-on, the through-the-glass (TTG) touch interface goes through a calibration process. For the
TTG to work properly, it is mandatory that the housing cover be correctly tightened before power-on.
NOTICE
After power-on, wait for the LCD calibration process to complete (±30 seconds) before
operating the TTG display.
M4 hex head
locking screws
Installing the LWT
25