Supported Applications
The Omega Series 70A consists of solid-state audible temperature alarms designed for use with controllers having relay outputs. These devices generate a loud alarm tone when powered, utilizing a piezoelectric transducer that operates as a solid-state oscillator to ensure no arcing or mechanical wear occurs during operation.
Operating Conditions & Performance
The Series 70A alarms operate within an ambient temperature range of -30 to 65°C (-22 to 149°F). Storage is supported from -40 to 85°C (-40 to 185°F). The units are rated for operation after being subjected to 95% relative humidity at 40°C continuously for 100 hours; following such exposure, the unit must be allowed to dry for a minimum of four hours at room temperature before operation.
Electrical specifications include a maximum voltage rating of 120 VAC (with 220 Vac available via suffix). The device tolerates surge voltages up to 20% over the maximum rated voltage applied for less than one minute. Life expectancy is documented as five years under normal operating conditions.
Performance life specifications are defined by duty cycle:
• Continuous: 100 hours continuous operation at 65°C with maximum rated voltage applied.
• Intermittent: A duty cycle of one minute on, five minutes off, a minimum of 5000 times at room temperature and maximum rated voltage applied.
Configuration Options
The series offers four distinct sound types to accommodate different alerting needs. All models produce a tone level of 95 dB @ 2900 Hz.
• 70A-1: Continuous tone.
• 70A-2: Fast pulse tone.
• 70A-3: Slow pulse tone.
• 70A-4: Warble tone.
Power supply options include standard 120 VAC or a configurable 220 Vac option. To order with 220 Vac power, add the suffix "-220V" to the model number (e.g., 70A-3-220V). The series is designed for easy installation requiring a hole diameter of 1¼" (28.58 mm).
Key Product Differences
Variants within the Series 70A are distinguished by their sound output pattern and power supply voltage.
• Sound Pattern: Models differ between continuous, fast pulse, slow pulse, and warble tones.
• Power Supply: Base models operate on 120 VAC. Variants with the "-220V" suffix are configured for 220 Vac operation at no additional cost.
| Operating Temperature, Max | 65 °C |
| Operating Temperature, Min | -30 °C |
| Operational Life | 100 hours continuous operation at 65°C with maximum rated voltage applied; Intermitten: A duty cycle of 1 minute on, 5 minutes off, a minimum of 5000 times at room temperature with maximum rated voltage applied |
| Relative Humidity | 95% relative humidity at 40°C continuously for 100 hours |
| Relative Humidity Note | Series 70A temperature alarms will operate after having been subjected to 95% relative humidity at 40°C continuously for 100 hours; after removal from high humidity, the unit should be allowed to dry for a minimum of 4 hours at room temperature before operation |
| Series ID | 70A-Srs-Audible-Buzzers |
| Storage Temperature, Max | 85 °C |
| Storage Temperature, Min | -40 °C |
| Supply Power Note | Surge Voltage: 20% over maximum rated voltage applied for <1 minute |
| Working Life | 5 years under normal operating conditions |