Frequency Meters

Alliance Engineering Company

Alliance Engineering Frequency Meters are vibrating reed type panel instruments designed for accurate visual indication of AC system frequency. The reed elements vibrate in resonance with the supply frequency, allowing direct reading on a calibrated 45–55 Hz scale without requiring any external power supply or signal conditioning. Available in 72mm flush-mount format (Model SR-72) with input voltage compatibility of 230V and 440V AC. Accuracy Class 0.3 as per IS 1248. Suitable for switchgear panels, DG synchronization panels, substations, and industrial power distribution boards. Manufactured by Alliance (India) under ISO 9001:2015 standards.

Key Technical Advantages

Model

SR-72

Measurement Range

45 – 55 Hz

Input Voltage

230V / 440V AC

Accuracy Class

Class 0.3

Panel Size

72 × 72 mm

Certification

ISO 9001:2015

Technical Specifications

Validated industrial performance metrics for enterprise deployment.

Engineering Data Sheet IS 1248

Parameter	Specification
Standard	IS 1248
Model	SR-72
Meter Type	Vibrating Reed Type
Measurement Range	45 Hz to 55 Hz
Nominal Frequency	50 Hz
Input Voltage	230V / 440V AC
Accuracy Class	Class 0.3
Overvoltage Category	CAT II
Panel Cutout Size	68 × 68 mm
Overall Dimensions	72 × 72 mm (front bezel)
Mounting Depth	Approx. 60 mm behind panel
Mounting Type	Flush Panel Mount with rear clamp
Display Type	Vibrating Reed Strip (visual resonance indication)
Scale	45 / 47 / 49 / 51 / 53 / 55 Hz (dual sided)
Housing Material	Black Thermoplastic Bezel with White Dial Face
Terminal Type	Screw Terminals (rear connection)
Power Consumption	≤ 3VA
Operating Temperature	-10°C to +55°C
Humidity	Up to 95% RH non-condensing
Pollution Degree	2

Standards & Compliance

Certified engineering excellence across regional and global regulatory frameworks.

IS 1248

Compliance with standard engineering and safety performance metrics.

IEC 60051

Compliance with standard engineering and safety performance metrics.

ISO 9001:2015

Certified Quality Management Systems for precision manufacturing.

Precision Configurations

Industrial Customizations

Our modular engineering workflow allows for specific adaptations to meet your site-specific infrastructure requirements. Consult with our technical team for bespoke builds.