The **MA28TAG-R** is a specific electronic component belonging to the family of **Piezoelectric Indicators** (Audio Buzzers), typically manufactured by **Mallory Sonalert Products**. It is designed for industrial, medical, and commercial applications where a loud, reliable audible alert is required. --- ### 1. Key Technical Specifications The following table highlights the primary electrical and physical characteristics of the MA28TAG-R: | Parameter | Specification | | :--- | :--- | | **Type** | Piezoelectric Indicator | | **Voltage Range** | 2 to 28 VDC | | **Rated Voltage** | 28 VDC | | **Frequency** | 2900 ± 500 Hz | | **Loudness (Min)** | 80 to 90 dB @ 2ft | | **Current Draw** | 2 to 15 mA | | **Tone Type** | Fast Pulse (typically 2-10 PPS) | | **Mounting Type** | Panel Mount | | **Termination** | G - Finger Proof Safe Terminal | --- ### 2. Functional Description The MA28TAG-R is an "indicator," meaning it has internal circuitry (a built-in oscillator). Unlike a transducer, which requires an external AC signal to produce sound, this part only requires a **DC voltage** to operate. * **Pulse Tone:** The "TAG" designation often refers to the specific timing logic of the sound. This model provides a pulsing alert rather than a continuous beep, which is more effective at grabbing human attention in noisy environments. * **Operating Principle:** When DC voltage is applied, the internal circuit causes the piezoelectric ceramic disk to flex rapidly. This displacement creates pressure waves in the air, resulting in high-frequency sound. --- ### 3. Physical Features & Construction * **Housing:** Usually made of black Noryl (plastic), which is flame retardant and durable. * **Terminals:** The "G" suffix indicates "Finger Proof" terminals. These are screw-down terminals with a protective guard to prevent accidental contact or short circuits. * **Knurled Nut:** Includes a heavy-duty threaded nut for securing the device into a standard 30mm (approx. 1.2 inch) circular panel cutout. --- ### 4. Typical Applications 1. **Industrial Control Panels:** Warning of machine faults or process completion. 2. **Medical Equipment:** Alarms for patient monitoring or pump malfunctions. 3. **Security Systems:** Audible feedback for keypad entries or breach alerts. 4. **Marine/Automotive:** Dashboard indicators for low oil pressure or high temperature.