MERIDIAN
UNIVERSAL GAS DETECTOR
INSTALLATION
4-17
USE AND DISCLOSURE OF DATA
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4.1.13 Installing the NPT Ex Seal
The NPT Ex seal is used to maintain the explosion proof/flame proof integrity of the enclosure. The following
describes installing between the device and a Meridian junction box assembly in the field. Refer to
.
Figure 4-7: NPT Ex Seal Installation
1. Unscrew the setscrew and housing cover.
2. Pull on the LCD PCB/CPU PCB set away from the four (4) standoffs.
NOTE: This procedure is only necessary if you did not originally order the device configured in this
manner from the factory.
WARNING:
ENSURE RECEIVERS AND POWER SUPPLIES ARE NOT POWERED WHEN
INSTALLING PCB INTO THE DEVICE. FAILURE TO DO SO COULD RESULT IN INJURY OR
DEATH.
WARNING:
ENSURE THE ATMOSPHERE IS FREE FROM COMBUSTIBLE AND/OR TOXIC
GASES PRIOR TO STARTING THIS PROCEDURE. FAILURE TO DO SO COULD RESULT IN INJURY
OR DEATH.