-6-
6.3 (continued)
A. Never run sensor wires in the same conduit with ignition wiring or other high energy wiring
such as the AC line power.
B. Keep secondary wires to spark plugs and other high voltage wiring at least eight inches
(200mm) away from sensor and sensor wiring.
C. Sensor switches may be connected to any passive device using contacts such as
standard switch gauges, pressure or level switches. DO NOT connect sensor leads to any
voltage producing element.
D. In the case of a field conversion where sensors have previously been used with Murphy
tattletales, it is recommended that the sensors be checked frequently when the DE system
is first put into use. Sensor contacts may be burned or pitted from past exposure to
ignition system primary voltage. It is advisable to replace such sensors.
E. If it becomes necessary to check sensor switch to panel wiring with an ohmmeter or other
checker, first DISCONNECT the plug-in terminal strips from the Terminal Module.
Applying voltage to the DE-2200 system through the sensor leads may damage the
device. In addition, the area should be tested as non-hazardous before such testing
commences.
6.4 ANALOG SENSOR WIRING - For each analog monitored point inputs 30-37 and 40-45 select
a transducer - either an Altronic pressure or temperature transducer listed above or one that
outputs a signal in the range of 0 to 5 Vdc or 0 to 25 mA. Mount as described above. Use
cable assembly 693008-x or similar to wire transducer to the Terminal Module. All unused
inputs must be shorted with a short jumper wire. An internal 5 volt sensor supply (500 mA.
max.) is available to power the Altronic transducers; see wiring diagrams. If the 5 volt sensor
supply exits the panel it must be fused with a 0.5 ampere fuse. If 24 volt powered sensors are
used the 24 volt supply to them must be fused appropriately. Take care not to damage the
insulation when installing and take precautions against later damage from vibration, abrasion,
or liquids in conduits. In addition, it is essential that the following practices be adhered to:
A. Never run sensor wires in the same conduit with ignition wiring or other high energy wiring
such as AC line power.
B. Keep secondary wires to spark plugs and other high voltage wiring at least eight inches
(200mm) away from sensor and sensor wiring.
6.5 THERMOCOUPLES AND THERMOCOUPLE EXTENSION WIRE - Grounded or ungrounded
type J or K thermocouples may be used. Use thermocouple extension wire of the same type
as the thermocouple probe to connect the thermocouple to the temperature scanner. Use
stranded thermocouple wire having a good moisture-resistant insulation such as PVC; for
higher ambient temperatures, Teflon or B-fibre insulated thermocouple wire is recommended.
To insure an accurate signal is transmitted to the instrument, avoid any added junctions,
splices and contact with other metals. All unused inputs must be shorted with a short jumper
wire. Take care not to damage the insulation when installing and take precautions against
later damage from vibration, abrasion, or liquids in conduits. In addition, it is essential that the
following practices be adhered to:
A. Never run thermocouple wires in the same conduit with ignition wiring or other high energy
wiring such as AC line power.
B. Keep secondary wires to spark plugs and other high voltage wiring at least eight inches
(200mm) away from thermocouples and extension wiring.
