K-O2 Oxygen Sensor
5/20/2022
Kele, Inc. • 3300 Brother Blvd. • Memphis, TN 38133
Page 4
www.kele.com
2.1
E
NCLOSURE
D
IMENSIONS
Distance from center
Case Style
Mtg hole diameter
Horizontal
Vertical
K-O2-Hx (Hinged)
5/16” (7.94 mm)
1.25” (31.75 mm)
1.50” (38.10 mm)
K-O2-Sx (Screw-down)
9/32” (7.14 mm)
1.50” (38.10 mm)
1.50” (38.10 mm)
Table 6
: Mounting Hole Diameters & Locations
3
E
LECTRICAL
I
NSTALLATION
The controller is not equipped with a power switch; it is operational whenever sufficient power is applied to the
power input terminals.
All electrical connections to the controller are made through screw terminals that can be unplugged for easy
landing of wires. The controller’s enclosure contains conduit knockouts on all sides for flexibility during
installation; refer to Figure 1 and Figure 2 for details and dimensions of the enclosures.
3.1
A
NALOG
O
UTPUT
C
ONNECTIONS
The sensor’s readings are reported at the controller’s powered 4-
20mA analog output connections. Current flows out of the ‘+’
terminal and returns to the ‘-‘ terminal.
The oxygen sensor output is provided at the terminal highlighted in
Figure 3. Analog output connection has polarity as labeled on the
controller silkscreen: care must be taken to ensure proper
connection. To wire the analog output connections:
1.
Power down the controller, this can be done by unplugging
the controller power terminal (see
Figure 6
).
2.
Unplug the analog output screw terminal labeled O1.
3.
Attach the signal wires, paying close attention to the
polarity.
4.
Plug the analog output screw terminal back into the
controller.
3.2
R
ELAY
C
ONNECTIONS
The controller has two, 10 Amp, 120/277 VAC UL-rated, SPDT dry-
contact relay output connections (shown in Figure 4) that can directly
control loads up to 10 Amps through the normally-open terminal.
The relay connections have three-terminal screw connectors that allow
devices to be wired to the controller in either normally-open (
NO
) or
normally-closed (
NC
) configuration. These outputs are activated when
ambient air oxygen concentration falls below the controller threshold
settings (refer to
Section 4.2
for more information).
Figure 3:
Analog Output
Figure 4
: Relay Outputs