PureAire Monitoring Systems, Inc.
2/22/2000
6
3: Installation
Both Model TX-KE and Model TX-KP gas detectors are designed for installation
in Class I, Division 1, Group B, C and D hazardous areas. They may be wall or
pipe mounted with the sensor pointing straight down. The instruments should
also be kept out of direct sunlight if possible.
3.1 Wiring
WARNING:
The controller or DCS that supplies power to the TX-KP must be
turned off before opening the cover of the transmitter or connecting the
transmission cable. It is the user’s responsibility to confirm that no combustible
gas is present when opening the cover of the transmitter; failure to do so could
result in an explosion.
3.1.1 General
1.
Remove the transmitter cover.
2.
Remove the display unit. It is held in place by two Phillips head screws
which are marked with arrows.
3.
Insert the three-wire 4-20 mA / 24 VDC power transmission cable through
the cable inlet.
WARNING:
An explosion-proof cable gland or connector must be used to seal
the transmission cable inlet.
4.
Connect the 4-20 mA / 24 VDC power transmission cable to the terminal
block.
5.
Replace the display unit.
6.
Replace the transmitter cover.
3.1.2 Model TX-KE
(Intrinsically Safe)
CAUTION:
If the Model TX-KE is installed in a hazardous area, it must be
wired through a safety barrier installed outside of the hazardous area. PureAire
Monitoring Systems recommends the use of the Model Safety Barrier
for intrinsically safe wiring.
The transmission cable should be connected to terminal block CN3 in the
explosion-proof housing. The white (+) wire connects to terminal #1, the black
(-) to terminal #2, and shield (S) to terminal #3.
IMPORTANT:
Do not switch the polarity of the 24 VDC power line. The white
(+24 VDC) line must connect to terminal #1 and the black (0 VDC) power line
must connect to terminal #2.
