RKI Instruments 65-2301RK - Manual (Page 8)

4 • 65-2300RK/65-2301RK Toxic Detector
Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the toxic detector into a 3/4” NPT
hub. Two wires extend from the top of the detector housing body. Use these wires to
connect the toxic detector to a controller. One of the wires is black and one of the wires is
color coded depending on the detector type. See Figure 4 on page 6 for the color code
assignments.
The housing body includes a 12 position connector at the bottom of the housing body. The
plug-in sensor mates to this connector. A pre-amplifier located between the connector and
the two interconnect wires conditions the sensor’s signal before the signal reaches the
controller.
Housing Cap, Cap Gasket, & Splashguard
The housing cap screws onto the detector housing. It retains the sensor and protects it
from damage. A removable splashguard is screwed onto the detector cap to protect the
sensor from impact damage, direct water spray, and splashing. Unscrew the detector cap
to access the sensor for maintenance or replacement. A cap gasket seals the interface
between the housing and cap.
Plug-in Sensor
The plug-in sensor is secured in the detector assembly by the housing cap. There is a
different sensor for each target gas. Through a series of chemical and electrical reactions,
the sensor produces an electrical output that corresponds to the detection range of the
sensor.
Junction Box
The junction box allows you to install the toxic detector at a mounting site that is remote
from a controller and protects the detector wiring connections. Two conduit hubs allow
you to mount the toxic detector to the junction box and connect the wiring from the
detector to a controller. Three spacers installed on the back of the junction box control the
distance of the junction box from a mounting surface and ensure that there is enough
room to install a calibration cup on the detector during calibration. A terminal block
within the junction box facilitates the wiring connections. A cover on the front of the
junction box allows access to the interior of the junction box.
Installation
This section describes procedures to mount the toxic detector in the monitoring
environment and wire the detector to a controller.
Mounting the Toxic Detector
NOTE: If you are installing a 65-2300RK, it does not include a junction box and is usually
factory installed in one of a controller’s conduit hubs or may be field installed
using the 3/4” NPT threads on the end with the wires. The 65-2301RK includes a
junction box as shown in Figure 3 below.
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site where the detector is not likely to be bumped or disturbed. Make sure
there is sufficient room to perform start-up, maintenance, and calibration