16
OIDMANUAL 1219
KAM CONTROLS, INC.
3.3VDC
OFFSET
-5VDC
GAIN
5VDC-D
5VDC-A
TP5
TP2
GND
TP7
TP1
TP3
TP4
39
39
A
NN
AR
BO
R
DR
IVE
HO
US
TO
N
TX
-
7
706
3
Tel.
+1
-7
13
-784
-000
0
Fax
: +
1
-713
-784
-000
1
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m.
co
m
KA
M
O
ID
M
ADE
IN
US
A
RS2
32
R
XD
CHS
GN
D
RS
232
T
XD
GN
D
24/
12
VD
C
(+
)
24
/12
VD
C
(-
)
48
5
RX
CHS
GN
D
48
5
TX
CHS
GN
D
4-20
m
A
(+
)
4-20
m
A
(-
)
I N S TA L L AT I O N C O N T I N U E D
CONNECTING THE OID
Proper Grounding of the OID™ sensor:
Grounding the OID™ sensor through the 4-20 mA signal out and power lines is not adequate to protect the OID™
sensor against power surges.
To ground the OID™ sensor, connect the chassis ground (if not already done) on the OID™ board (labeled CHS
on the OID™ Terminal Block. FIG. 3-16) to the green grounding screw on the OID™ explosion-proof box using 16
AWG braided wire. Ensure that the box is connected to Earth ground either through the pipeline or appropriate
low-impedance buried grounding structure.
NOTE: CHS is isolated from GND. Grounding CHS to pipeline through the grounding screw will not short OID™
GND to the pipeline.
To connect the power for the OID™ sensor, first check both wires from the source for polarity and
voltage, then label appropriately.*
Connect positive wire to 24/12 VDC (+). FIG. 3-16.
Connect negative wire to 24/12 VDC (-).** FIG. 3-16
Check voltage and polarity at terminal block.
EXTERNAL FUSES:
Power Amp slow fuse, Current loop 750 mA
MAXIMUM CURRENT LOOP RESISTANCE:
500 Ohm
*Recommended Wire: Shielded twisted pair wire is recommended for both power and signal.
**WARNING: Connecting a power source to the 4-20 mA ports on the terminal board will damage the 4-20 mA ouput
and result in failure of the unit.
Chassis Ground
Power Supply
1.
2.
3.
4.
FIG. 3-16
