EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
141
8.10 Shielded Temperature Probe
The temperature probe is encased in a radiation shield that shields it from direct sunlight and
allows ambient air to flow through and around it. The probe mounts to the outside wall of the
wayside enclosure and provides accurate temperature indications over a range of -49°F to
+149°F (-45°C to +65°C). Site ambient temperature (at the time the train passed the site) is
included with most system reports.
The system supplies 12 volts to the shielded temperature probe. The probe returns 0 to
5 volts. Zero volts indicate a -49°F (-45°C) reading. Five volts indicate a +149°F (+65°C)
reading. During normal operation, you should probably never get either reading. Therefore, if
you get a -49°F (-45°C) reading, the probe could be malfunctioning, the cable from the probe
to the system could be cut, or the wiring to the terminal block on the System Interface board
could be disconnected. If you get a +149°F (+65°C) reading, the probe could be
malfunctioning or the ground wire from the probe to the system could be cut.
There is one shielded temperature probe per system. To install this probe:
1
Be sure that you have on hand the customer-supplied fasteners needed to attach the
shielded temperature probe to the outside of the bungalow; a wire stripper; and the
fasteners needed to attach the RF-filter assembly to the inside of the bungalow.
2
If you haven't done so already, remove the shielded temperature probe and the
RF-filter assembly from its box.
3
Mount the probe onto the outside of the bungalow, preferably on the side of the
enclosure where the SmartScanIS enclosure is mounted.
No matter where it is mounted, make sure the whole shielded temperature probe is in
the top third of the bungalow
or
above the roof of the bungalow.
4
Route the cable from the probe to the SmartScanIS enclosure.
In sheet metal, use a rubber grommet in every hole through which you route the cable.
At a single-track site, the cable is routed to the bottom of the SmartScanIS enclosure.
At a double-track site, the cable is routed to the bottom of the leftmost SmartScanIS
enclosure.
5
As shown below, insert the four Molex pins (on the end of the cable of the probe) into
the supplied Molex housing.
The red wire supplies 12 VDC to the shielded temperature probe.
Summary of Contents for SmartScanIS
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