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Distributors for

The Mallory Sonalert®

Commercial and Industrial Models
Sonalert® Audible Signal Devices

Environmental Specifications

Surge Voltage
15% over maximum rated voltage applied for less than one minute.

Reverse Voltage - DC Models
Maximum reverse polarity equal to rated voltage for one minute. Some models may sound softly when subjected to reversed polarity voltage.

Life Specification
Continuous - 250 hours continuous operation at 65 degrees C with maximum rated voltage applied.

Intermittent-A duty cycle of 1 minute on, 5 minutes off, a minimum of 10,000 times at room temperature and maximum rated voltage applied.

Life Expectancy
7 years under normal operating conditions

Storage Temperature
-40 degrees C to +85 degrees C

Operating Temperature
-30 degrees C to +65 degrees C

The Sonalert® signal should operate after having been subjected to 95% Relative Humidity at +40 degrees C continuously for 100 hours. After removal from test, the unit should be allowed to dry a minimum of 4 hours at room temperature before operation. Units should deliver original output characteristics.

The Sonalert signal should be mounted in the standard manner on a mounting panel. The specimens should be subjected to a harmonic motion having an amplitude of 0.03 inch (0.06 inch maximum total excursion). The frequency should be varied uniformly between a limit of 10 and 55 Hertz. The entire frequency range from 10 to 55 Hertz and return to 10 Hertz should be traversed in approximately one minute. Motion should be applied for two hours in each of 3 mutually perpendicular planes (total 6 hours). This test should be conducted while the Sonalert signal is not operating. After completion of test, Sonalert signals should meet specifications.

Salt Spray
The Sonalert signal should meet specified operating conditions after completing 96 hours in an atomized salt spray while not operating. The spray should consist of a 5% salt solution atomized by a forced air supply. The solution should be sprayed through a nozzle into a chamber maintained at 35 degrees C. After salt spray, the unit should be removed and washed in running water not warmer than 40 degrees C. A soft hairbrush or plastic bristle brush should be used, lightly brushing to remove salt deposits from the unit. The cleaned Sonalert signals should be placed on absorbent material with the nose pointed downward and allowed to dry at room temperature for 24 hours prior to use.

Terminal Strength
5 pounds, applied axially for a period of 5 minutes. This is considered a destructive test.

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