2-8
Thermalert ET Series Operator's Manual
2.3
ELECTRICAL INSTALLATION
A standard 4.5 m (15 ft.) cable is supplied with each sensor. It consists of a factory-
installed 5-pin DIN connector on one end and four leads plus shield on the other end.
Note: Thermocouple and current output models have different cables. It is important to use
the appropriate cables to maintain accuracy.
When using protective conduit, consider the following:
• Use a double-hex water tight compression coupling designed for 19 mm (3/4
inch) EMT thin walled conduit.
• To avoid undue stress on the housing during installation, attach the coupling
first to the conduit and then to the sensor. Do NOT suspend the conduit from
the sensor, or the sensor from the conduit.
When powered by a transformer, the unit may be susceptible to line noise. Line noise
can be eliminated by the addition of capacitors on the secondary of the stepdown
transformer. Note that any stepdown transformer shipped with the unit includes the
necessary capacitors. Customer supplied transformers will require the modifications
shown in the following illustration.
Note: Use 0.01µF/250 VAC capacitors for C1 and C2. An example is Sprague p/n125LS10
Ceramic Disk Capacitor.
Figure 2-11: Stepdown Transformer Modifications