Installing The Sensor - Sensaphone 1108 User Manual

Sensaphone ® Model 1108 User's Manual
low temperature limits. Temperature inputs must be used with a
Sensaphone Remote Temperature Sensor.
Before wiring, it is advisable to disable the inputs to
prevent accidentally tripping an alarm. Refer to
Chapter 5, Section 5.2.
Important Note regarding Ultra-Low temperature freezers:
If you are connecting the Sensaphone to an ultra-low temperature
freezer (i.e. Revco, Thermo Forma, Fisher Scientific, etc...) be
aware that the the Sensaphone can only monitor temperatures
between -20 and 150 degrees Fahrenheit. As a result, you can
only monitor these freezers if they are supplied with the
appropriate alarm terminals/contacts. Please refer to your Freezer
owner's manual for proper connection.

2.10 Installing the Sensor

After you have selected the sensor, loosen the screw of the alert
input and its corresponding ground. Two wire leads are used to
connect any monitoring sensor. Fasten one lead to the numbered
screw and the other lead to GND. Tighten both screws. If the
input was not disabled, the Model 1108 may recite its "Alert
Condition Exists" message as you connect the sensor. If it does,
just press any key to stop. Re-enable the input after wiring. Refer
to Figures 2-6 and 2-7 for connecting a sensor to an alert input.
Any sensor can be attached to the Model 1108 using 22-gauge
wire. The sensor can be several hundred feet from the unit, as
long as the total resistance of the circuit is not greater than 50
ohms. Use wire appropriate for the application.
26
NOTE
Figure 2-6. Sensor Connected to an Alert Input