Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector - Manual (Page 15)

13 95-8440 9.3
DETECTOR SEPaRaTION (OPTIONaL)
In applications where the detector must be installed in a
different location from the control device, a PIRTB must
be installed at the detector location to make the electrical
connection. The control device can be the FlexVu UD
10 ,
Infiniti U 9500 Transmitter or the tall cover termination box
with window. Refer to Figure 21 for a typical separation
diagram. For purposes of brevity the following discussion
only refers to the Infiniti U
9500 Transmitter as the control
device.
By connecting a length of tubing ( 1/4 inch O.D.) from the
direct inject calibration nozzle back to the control device
location, the operator can accomplish calibration from
the remote location.
Wiring Requirements for Detector Separation
Shielded four wire cable is recommended for connecting
the detector termination box to the transmitter. Cable with
a foil shield is recommended. The shield of the cable
should be open at the detector termination box and
connected to earth ground at the transmitter termination
box. Ensure that the shield wire is clipped short and
insulated with electrical tape to prevent accidental
grounding at the open end.
The maximum distance between the detector termination
box and the transmitter is limited by the resistance of the
connecting wiring, which is a function of the gauge of
the wire being used. Refer to Figure
2 to determine the
maximum separation distance for a given wire size.
NOTE
It is important to maintain a minimum of +18 Vdc
(including ripple) at the PointWatch Detector.
When determining the appropriate wire size for the
installation, refer to Figure
2 . Be sure to take into
account the distance from the power supply to the
PointWatch Detector or to the U
9500 Transmitter
and then to the PointWatch Detector to ensure that
the power requirements are met.
+ 24 VDC
POWER SUPPLY
4 TO 20 MILLIAMPERES
INFINITI TRANSMITTER
PIRTB TERMINATION BOX
CHASSIS
+
+
–
–
PO
WER OUT
NO
COM
NC
NO
COM
NC
NO
COM
A
UX RELA
Y
LO
W RELA
Y
HIGH RELA
Y
NC
NO
COM
NC
S
–
+
S
–
–
+
+
RESET
CA
L
FA
UL
T RELA
Y
PO
WER
PW
IN
A1737
SPARE
CAL
4 – 20
RET
+ 24
CHASSIS
CAL
4 – 20
RET
+ 24
POINTWATCH
DETECTOR
GREEN
YELLOW
WHITE
BLACK
RED
Figure 22—Sensor Separation with Infiniti U9500 Transmitter and PIR9400
TERMINATION BOX
POINTWATCH
DETECTOR
SUITABLE WIRING.
MUST MEET ALL LOCAL CODES.
CONTROL DEVICE SUCH AS INFINITI TRANSMITTER,
FLEXVU UD10, OR TALL COVER JUNCTION BOX WITH WINDOW
C1757
Figure 21—Options for Detector Separation