Audible Alarm for Load Moment Indicators | Industrial Safety Component

Product Specifications

Technical details and manufacturing context for Audible Alarm

Definition

The audible alarm is a critical safety component within the Load Moment Indicator (LMI) system. It generates distinct sound signals to immediately alert crane or lifting equipment operators when the LMI detects that the equipment is approaching or exceeding its safe working load limits, operating radius limits, or other predefined safety thresholds. This auditory warning provides real-time feedback to prevent overloading and potential accidents. The alarm is designed for integration into LMI systems used in machinery and equipment manufacturing, particularly for cranes and lifting devices. It operates on a rated voltage of 24 V DC with a tolerance of ±10% (operating range 21.6–26.4 V DC) and consumes no more than 200 mA at rated voltage. The sound pressure level ranges from 85 to 105 dB(A) measured at 1 meter distance, conforming to IEC 61672-1 as a reference standard. The frequency range of the audible tone is 500–3000 Hz. The device is rated for continuous operation in ambient temperatures from -40°C to 85°C. Its ingress protection rating is IP65–IP67 per IEC 60529, indicating dust-tight and water-jet protected construction. The housing is made of flame-retardant ABS material (UL 94 HB). The weight without mounting bracket is 150–250 grams, and approximate dimensions are 90×60×40 mm (L×W×H). The service life is at least 50,000 hours at rated voltage and 25°C. These values are reference ranges that must be verified for the specific model and application. The alarm is a component, not a standalone system, and its performance depends on proper integration with the LMI. For procurement, verify model-specific parameters and compliance with applicable standards with the legal manufacturer or supplier.

Working Principle

The audible alarm receives electrical signals from the LMI's processing unit when unsafe conditions are detected. These signals activate an internal sound-producing mechanism (typically a piezoelectric buzzer, electromagnetic buzzer, or speaker) that converts electrical energy into audible sound waves. The alarm produces specific sound patterns (continuous, intermittent, or varying frequency) corresponding to different warning levels or conditions. The alarm's operation is triggered by the LMI's logic, which monitors load, radius, and other safety thresholds. The sound pressure level and frequency are designed to be clearly audible in industrial environments. The alarm is powered by the LMI's DC supply, and its current consumption is limited to ensure compatibility. The device is sealed to protect internal components from dust and water ingress, and its housing is flame-retardant for safety. The alarm does not make decisions; it only responds to commands from the LMI. For proper function, the alarm must be correctly wired and tested periodically. The service life is rated under continuous operation, but actual life may vary with environmental conditions and usage patterns.

Common Materials

Plastic housing, Piezoelectric element, Copper wiring, Electronic components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	24 ±10% V DC	Operating range 21.6–26.4 V DC
Current Consumption	≤200 mA	At rated voltage
Sound Pressure Level	85–105 dB(A)	Measured at 1 m distanceIEC 61672-1
Frequency Range	500–3000 Hz	Audible warning tone
Operating Temperature	-40–85 °C	Continuous operation
Ingress Protection	IP65–IP67	Dust-tight and water-jet protectedIEC 60529
Housing Material	ABS	Flame retardantUL 94 HB
Weight	150–250 g	Without mounting bracket
Dimensions (L×W×H)	90×60×40 mm	Approximate
Service Life	≥50000 h	At rated voltage and 25°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Sound Generator
Produces audible sound waves through vibration

Material: Piezoelectric ceramic or electromagnetic coil
Housing Part
Protects internal components and directs sound output

Material: ABS plastic or polycarbonate
Terminal Connector Part
Provides electrical connection to LMI system

Material: Copper alloy with plastic insulation
Mounting Bracket Part
Secures the alarm to equipment structure

Material: Galvanized steel or aluminum

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Audible Alarm.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Load Moment Indicator (LMI)

View system integration details

Manufacturers of Audible Alarm

Manufacturer profiles associated with Audible Alarm.

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Frequently Asked Questions

What is the purpose of the audible alarm in an LMI system?

The audible alarm alerts operators to unsafe operating conditions detected by the Load Moment Indicator, such as approaching or exceeding safe load limits, radius limits, or other thresholds. It provides real-time auditory feedback to help prevent overloading and accidents.

What are the key electrical specifications of this alarm?

The alarm operates at a rated voltage of 24 V DC with a tolerance of ±10% (21.6–26.4 V DC) and consumes no more than 200 mA at rated voltage. These values are reference ranges; verify the specific model's requirements with the manufacturer.

What environmental conditions can this alarm withstand?

The alarm is rated for continuous operation in temperatures from -40°C to 85°C and has an ingress protection rating of IP65–IP67 per IEC 60529, meaning it is dust-tight and protected against water jets. The housing is flame-retardant ABS (UL 94 HB).

How should I verify the alarm's compliance with standards?

The listed standards (IEC 61672-1 for sound pressure level, IEC 60529 for ingress protection, UL 94 HB for flammability) are references for procurement and verification. You must confirm with the legal manufacturer or supplier that the specific model meets these standards and obtain relevant documentation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric pressure only (non-pressurized)
other spec:	Sound output: 85-110 dB at 1 meter, IP65 ingress protection
temperature:	-40°C to +85°C

Audible Alarm

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards