The **SCE048LD3VC4F** is a specialized electronic acoustic signaling device manufactured by **Mallory Sonalert Products**. It is part of the SCE series, designed for industrial applications requiring robust, panel-mounted audible alarms. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Mallory Sonalert Products | | **Voltage Rating** | 28 to 48 Volts DC | | **Current Consumption** | 40 mA (Maximum) | | **Sound Level (SPL)** | 85 to 95 dB @ 2 Feet | | **Frequency** | 2900 ± 500 Hz | | **Tone Type** | Medium Pulse (approx. 2 - 10 pulses per second) | | **Termination** | Screw Terminals | | **Mounting Type** | Panel Mount (30mm hole) | | **Housing Material** | 6/6 Nylon, Color: Black | --- ### 2. Functional Components The device is comprised of several internal electronic and mechanical parts that allow it to function as a high-reliability alarm: * **Piezoelectric Transducer:** The core "speaker" element. It uses a ceramic disc that vibrates when an electric field is applied, converting electrical energy into high-frequency sound waves. * **Oscillator Circuit:** An internal PCB (Printed Circuit Board) containing an integrated circuit or transistor-based oscillator. This circuit converts the DC input into the specific frequency required to drive the piezo element. * **Pulse Controller:** A secondary timing circuit that interrupts the continuous tone to create the "Medium Pulse" pattern characteristic of this specific model. * **Protective Housing:** A ruggedized nylon shell designed to withstand industrial environments, often rated for NEMA 3R, 4X, and 12 when used with a gasket. --- ### 3. Wiring and Integration To integrate this part into a system, the following electrical logic is typically applied: ```markdown VDC (+) ---- [ Fuse ] ---- [ Switch/PLC Output ] ---- ( + Terminal ) ( SCE048LD3VC4F ) GND (-) ---------------------------------------------- ( - Terminal ) ``` * **Voltage Range:** Ensure the power supply stays within the **28V - 48V DC** window. Low voltage may result in a faint sound, while overvoltage can damage the internal oscillator. * **Polarity:** As a DC device, polarity must be observed (Positive to '+', Negative to '-'). --- ### 4. Typical Applications * **Industrial Control Panels:** To alert operators of machine faults or cycle completions. * **Medical Equipment:** High-reliability alarms for patient monitoring or hardware errors. * **Security Systems:** Audible indicators for door bypass or system status.