UKAS PRT Calibration
-196°C to +420°C
Calibration Range
ISO/IEC 17025
UKAS Accredited Laboratory
15+ Years
Temperature Calibration Expertise
UKAS-Accredited PRT Calibration Services
Are you looking for accurate and competitive PRT calibration services?
PRT calibration is essential for maintaining the accuracy, traceability and reliability of platinum resistance thermometers used within calibration laboratories, manufacturing facilities and regulated industries.
At Withnell Sensors, we provide UKAS-accredited PRT calibration services from our ISO/IEC 17025 accredited laboratory. Using a combination of fixed points and fluid comparison baths, we offer precision platinum resistance thermometer calibration from -196°C to 420°C.

Our service can be tailored to your specific requirements, including the number of calibration points, required temperatures and measurement uncertainties.
Specialist PRT Calibration
Platinum Resistance Thermometer Calibration
Dedicated calibration services for SPRTs and industrial PRTs.
UKAS Accredited
ISO/IEC 17025 accredited laboratory and procedures.
Fast Turnarounds
Flexible service options to minimise downtime.
Competitive Pricing
Cost-effective calibration without compromising quality.

Fixed Point and Comparison Bath Calibration
We use a combination of internationally recognised fixed points and high-accuracy comparison baths to deliver reliable platinum resistance thermometer calibrations. Our UKAS-accredited laboratory can perform calibrations across a wide temperature range, supporting customers requiring traceable reference standards for laboratory and industrial applications.
Calibration points can be selected to suit your requirements, ensuring your PRT is calibrated for its intended operating range. Calibration capability:
- Liquid Nitrogen: -196°C
- Triple Point of Water: 0.01°C
- Tin Fixed Point: 231.928°C
- Zinc Fixed Point: 419.527°C
Trusted UKAS Calibration Laboratory
At Withnell Sensors, we continuously invest in laboratory equipment and facilities to support a wide range of customer requirements.
All PRT calibrations are performed within our ISO/IEC 17025 accredited laboratory, ensuring complete traceability and confidence in your measurement results.
We understand that calibration downtime can disrupt operations, which is why we focus on competitive lead times, responsive communication and flexible service options.
If required, we can also discuss service agreements and ongoing calibration programmes.


UKAS On-Site Probe Calibration
For customers who require equipment to remain operational, we offer UKAS-accredited (or traceable) on-site temperature probe calibration.
Our engineers can perform calibration on-site throughout the UK and Ireland using specialist calibration equipment.
Typical calibration points range from -90°C to 140°C, with calibration programmes tailored to your requirements.
Benefits include:
- No equipment shipping
- Reduced downtime
- Calibration at your facility
- Flexible scheduling options

The withnell way
Temperature Calibration Specialists
Withnell Sensors has been providing specialist temperature calibration services for more than 15 years.
Our laboratory supports thousands of annual calibrations and offers one of the UK’s widest accredited temperature calibration ranges.
PROCESS
End-to-end support
Clients we’ve Worked With
Hear From Our Customers
Our temperature mapping services support organisations across pharmaceutical, healthcare, food, manufacturing and laboratory environments where environmental control and compliance are essential.
Get in Touch With Our Specialist Team
Whether you require a single temperature mapping study or ongoing temperature mapping validation support, our engineers can help identify the right approach for your environment and compliance requirements.
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