RKI Instruments GD-K8A - Manual (Page 7)

Model GD-K8A Diffusion Detector Head • 3
The housing has two mounting flanges, one at the top and one at the bottom. The top
mounting flange has a slotted hole in the middle and the bottom mounting flange has two
holes, one in each corner. These holes are used for mounting the GD-K8A to a vertical
surface.
Cable Bushing
A cable bushing on the bottom left of the housing allows you to route wiring from a
controller to the two point external wiring terminal strip in the housing. The cable
bushing accommodates a .35 inch to .43 inch diameter cable.
External Wiring Terminal Strip
A two point terminal strip in the bottom right part of the housing is provided for making
wiring connections from the GD-K8A to a controller. A grounding bolt is located to the left
of the terminal strip. This grounding bolt is earth ground and cannot be used to wire the
GD-K8A to the controller.
The terminal strip has two spark killers installed in the terminals. These spark killers
protect the GD-K8A from noise and spikes in the “+” line and must remain installed when
the GD-K8A is installed and wired to a controller.
Sensor Unit
The sensor unit consists of the sensor bracket, sensor, and amplifier.
Figure 2: Sensor Unit
SPAN
ZERO
GAIN
CHECK
1(+)
2(-)
Sensor
Amplifier
Sensor
Bracket