Accurate temperature measurement is fundamental to the performance of every energy-efficient chilled water system. In modern data centres, the temperature difference (ΔT) across Cooling Distribution Units (CDUs) is typically only 2°C to 5°C, meaning even a small measurement error can significantly impact cooling capacity calculations, heat balancing, and overall energy efficiency. Reducing measurement uncertainty is therefore essential for reliable Measurement & Verification (M&V), system commissioning, and compliance with Singapore SS591:2021 Code of Practice for Energy Efficiency of Central Chilled Water Systems.

Acez Sensing TE25 & TE26 – High-Accuracy Temperature Sensors

The Acez Sensing TE25 and TE26 series are engineered specifically for high-performance HVAC, chilled water, and mission-critical data centre cooling applications. Designed to meet the stringent requirements of SS591 M&V, these sensors provide exceptional measurement accuracy, long-term stability, and installation flexibility for consultants, system integrators, and facility owners.

Unlike conventional temperature probes that rely on a single sensing technology, the TE25 and TE26 series are available with multiple sensing elements to suit different measurement requirements:

• Platinum RTD Pt100 (Class 1/10 DIN) – Delivers outstanding long-term stability with a typical calibrated system accuracy of ±0.03°C, making it ideal for chilled water supply and return temperature measurement.
• Platinum RTD Pt1000 (Class 1/10 DIN) – Provides the same ±0.03°C measurement performance while offering improved signal resolution and reduced lead-wire influence over longer cable runs.
• High-Accuracy 10kΩ NTC Thermistor (25°C) – Offers excellent sensitivity and rapid response, with a sensor tolerance of ±0.05°C between 0°C and 50°C, making it well suited for high-resolution chilled water monitoring.

To ensure optimum measurement performance, the TE25 and TE26 sensors are available with customised probe lengths, thermowells, process connections, cable lengths, and mounting configurations to suit Cooling Distribution Units (CDUs), chilled water headers, heat exchangers, and piping networks. Custom probe designs ensure the sensing element reaches the optimum immersion depth, enabling accurate pipe core temperature measurement while minimising thermal conduction errors.

Each sensor can also be supplied with ISO/IEC 17025 traceable calibration, providing confidence in measurement accuracy, traceability, and long-term reliability throughout the operational life of the cooling system.

Blue Gizmo BG38PT – Precision Thermometer for SS591 Measurement & Verification

Complementing the TE25 and TE26 sensors is the Blue Gizmo BG38PT Precision Thermometer with Datalogging, engineered to provide high-accuracy temperature Measurement & Verification for chilled water systems. When paired with Acez Sensing temperature probes, the BG38PT forms a complete calibrated temperature measurement system capable of delivering a combined measurement accuracy of up to ±0.03°C.

Designed specifically for commissioning, retro-commissioning, and chilled water performance verification, the BG38PT features:

• 0.001°C high-resolution temperature display for precise thermal analysis.
• Dual-channel temperature measurement for accurate supply, return, and ΔT calculations.
• Comprehensive datalogging capabilities for Measurement & Verification (M&V), commissioning, and performance trending.
• Complete system calibration of both the thermometer and temperature probes as a single calibrated measurement assembly.
• Combined calibrated system accuracy of up to ±0.03°C, significantly reducing measurement uncertainty and improving confidence in cooling capacity calculations.

Together, the Acez Sensing TE25 & TE26 temperature sensors and Blue Gizmo BG38PT Precision Thermometer provide consultants with a complete, traceable temperature measurement solution that enables accurate chilled water heat balancing, cooling capacity verification, and compliance with SS591.

Beyond temperature measurement, Acez Instruments offers a complete Measurement & Verification (M&V) ecosystem including ultrasonic clamp-on flow meters, pressure transmitters, power and energy meters, and integrated data acquisition systems (DAQ). This comprehensive instrumentation solution enables consultants and facility owners to accurately assess cooling performance, optimise chilled water systems, reduce energy consumption, achieve ESG objectives, and operate smarter, more sustainable data centres.

Acez Instruments – Precision Beyond Measurement. Empowering Sustainable Data Centres.