Phonetics 1108 user manual Important Note regarding Ultra-Low temperature freezers

Sensaphone® Model 1108 User’s Manual

low temperature limits. Temperature inputs must be used with a Sensaphone Remote Temperature Sensor.

NOTE

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.

Figure 2-6. Sensor Connected 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.

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