Technical Manual

XNX Universal Transmitter
Section 2 - Installation and Operation
40

EC
Adaptor
Optional Local HART
IS Barrier must
be connected to J1
EC IS Barrier must
be connected to J2
4
3
2
1
-
+
6
5
J1 HART
S1 S2
J2 EC Barrier
Terminal Block 1
Local HART
IS Barrier
(optional)
HART
Adaptor
EC IS Barrier
Sensor Cartridge
Weatherproof Cap
Sensor Retainer
Sensor Cartridge
Weatherproof Cap
Sensor Retainer
Local Sensor Mounted to Transmitter
Sensor Mounted to
Remote Sensor Kit
Figure 42. EC Personality Wiring
XNX Electrochemical Sensor Installation
EC Sensor Installation
Caution: A missing oxygen cell will result in 0% V/V O
2
gas
concentration, thus triggering alarm events. In this situation, check
the connection of the EC cell to the sensor connector board.
Caution: For biased sensors (e.g., nitrogen dioxide) remove the
sensor stabilizer from the bottom of the sensor prior to installation.
Using Figure 42 as a guide, follow this procedure:
1. Verify that the label on the new sensor is the correct gas
type.
2. Unscrew the weatherproof cover, loosen the retainer
locking screw with the supplied hex key, and unscrew the
sensor retainer.
3. Plug in the new sensor. Take care to align the sensor pins
with the connector.
4. Retthesensorretainer,tightenthelockingscrewwiththe
hexkey,andrettheweatherproofcover.Countdowntime
of up to 180 seconds (depending on the sensor type) will
be displayed.
5. Acknowledgement of the gas type will be required before
proceeding. For more information on setting gas type, see
Section 2.5.1 Gas Selection.