Model CXT-DM
CXT-DM Instruction Manual
Rev. 2.0
Page 14 of 54
2.5
Electrical Installation
The CXT is designed to be battery operated, and normally will not have external cabling or wiring. If the
sensor requires external wiring, the Sensor Assembly should be installed in accordance with local electrical
codes. Proper electrical installation of the gas sensor is critical for conformance to electrical codes and to
avoid damage due to water leakage.
If a conduit run exists a drain should be incorporated. The drain allows H
2
O condensation inside the conduit
run to safely drain away from the sensor assembly. The electrical seal fitting is required to meet the National
Electrical Code per NEC Article 500-3d (or Canadian Electrical Code Handbook Part 1 Section 18-154).
Requirements for locations of electrical seals are covered under NEC Article 501-5. Electrical seals also act as
a secondary seal to prevent water from entering the wiring terminal enclosure. However, they are not designed
to provide an absolute watertight seal, especially when used in the vertical orientation.
NOTE:
The Detcon Warranty does not cover water damage resulting from water leaking into
the enclosure.
NOTE:
Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon
supplies one ¾” NPT male plug with each J-box enclosure. If connections are other than ¾”
NPT, use an appropriate male plug of like construction material.
CAUTION
Do not apply power to the sensor until all wiring is properly terminated
(See section 2.6, Initial Start Up).
2.5.1
Applying Power to the Unit
CAUTION
A 24V solar panel is the most common option for supplying external power. A solar
panel will recharge the Detcon Smart Battery Pack.
DO NOT CHARGE IN A
HAZARDOUS LOCATION
. It CANNOT be used with the C-cells or D-cells. A
24V input with the C-cells or D-cells will damage the cells.
1.
Remove the junction box cover
2.
If external power is to be applied to the unit, connect the incoming 24V to the Connector labeled ‘DC
INPUT’. Connect 24V to the terminal labeled ‘24VDC’ and Return to the terminal labeled “GND”. The
Battery Bracket will need to be removed in order to access the connector.
3.
Install the batteries:
NOTE
The safety approvals require removing entire sensor assembly to a non-hazardous area
before installing or changing out the batteries or battery pack.
a)
For units utilizing the 12V Smart Battery Pack or the D-Size Battery Holder/pack, remove the
battery cover by unscrewing the top screws and moving the battery cover out of the way. Plug the
battery pack into the Terminal Board. Power will be applied, and the unit will proceed to power
up (Section 2.6). The battery Packs will only plug in in one orientation. Replace the Battery
Cover and tighten the two screws down to secure the battery pack in place.
b)
If the unit utilizes the “C” sized lithium 3.6V batteries and battery holder, install the batteries
being careful to install the batteries properly. Power will be applied, and the unit will proceed to
power up (Section 2.6).