Calog Instruments began operations in 1989 as the dedicated manufacturing arm of Instrotech (Pty) Limited. Since then, Calog has specialised in the design, development, and production of high-quality process control instrumentation and specialised electronic systems.

With over three decades of engineering expertise, Calog Instruments has become one of South Africa’s leading producers of industrial measurement and control solutions, supplying both local and international markets. Our products are built for accuracy, reliability, and long-term performance in demanding industrial environments.

What We Manufacture

Calog Instruments offers a comprehensive and technically robust manufacturing programme that includes:

Process Calibrators

Locally developed, high-accuracy calibrators designed for verification and testing of process measurement systems.

Load-Cell Calibrators and Testers

Reliable instruments engineered to ensure accuracy and consistency in weighing systems.

DIN-Rail Mount Signal Conditioners

Compact, robust, and designed to convert, isolate, and transmit industrial signals with exceptional accuracy and noise immunity.

Digital Panel Meters

Versatile display instruments used to monitor, indicate, and control critical process values such as temperature, flow, pressure, and weight.

Digital Process Indicators

High-performance process indicators engineered to provide clear, reliable, and accurate visualisation of industrial process parameters. They are used widely across plants and machinery for real-time monitoring, diagnostics, and control.

Custom-Engineered Systems

Tailor-made electronic and measurement solutions developed for unique or complex industrial applications.

Our manufacturing capability combines advanced engineering, local expertise, and internationally aligned quality standards to deliver products trusted worldwide.

Specialised Products & Systems

Calog Instruments is recognised for developing innovative, application-specific systems that address real operational challenges across industries.

INSPECTA ASLD – Acoustic Tube Leak Detection System

The INSPECTA Acoustic Steam Leak Detection (ASLD) system is a locally developed and manufactured solution widely used in power stations worldwide.
It provides early detection of boiler tube leaks, enabling operators to reduce downtime, prevent equipment damage, and improve plant safety.

Installed globally in:
South Africa, Germany, Australia, Turkey, India, Malaysia, China, and other regions.

Key Advantages:

• Real-time acoustic monitoring

• Early leak warning

• Reduced downtime and maintenance costs

• Reliable operation in harsh, high-pressure environments