Accredited Temperature Calibration Services
In processes where a few degrees can be the difference between a sterile batch and a total loss, temperature accuracy is non-negotiable. At DRS Technologies, we provide expert temperature calibration services for sensors, displays, and thermal environments. Our laboratory utilizes high-stability dry blocks, stirred liquid baths, and blackbody sources to verify your equipment across a broad range of temperatures ($-196^\circ\text{C}$ to $1200^\circ\text{C}$).
Why Thermal Accuracy is Essential for Regulatory Compliance
Temperature sensors like thermocouples and RTDs (Resistance Temperature Detectors) suffer from “sensor drift” caused by thermal cycling, vibration, and oxidation. In industries such as pharmaceuticals (FDA) or aerospace (Nadcap), uncalibrated sensors can lead to failed audits and compromised product safety. Regular calibration by DRS Technologies ensures your instrumentation meets ASTM E230 and AMS2750 requirements.
Our Technical Temperature Calibration Process
Our metrology experts employ a multi-point comparison protocol to eliminate measurement uncertainty:
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Sensor Integrity Audit: We inspect probes for sheath oxidation, lead-wire degradation, and insulation resistance to ensure the sensor is physically capable of accurate transmission.
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Comparison Calibration: Probes are immersed in a highly stable medium (liquid bath or dry block) alongside a NIST-traceable Standard Platinum Resistance Thermometer (SPRT).
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Electronic Characterization: For digital indicators, we simulate temperature signals (mV for thermocouples, $\Omega$ for RTDs) to verify the internal electronics and cold-junction compensation are functioning correctly.
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Hysteresis and Stability Testing: We measure the sensor’s ability to return to a baseline and maintain a steady reading, ensuring it can handle the rigors of your specific process.
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Certification and Traceability: Every unit is returned with a calibration certificate featuring “As-Found” and “As-Left” data, calculated uncertainty, and an unbroken chain of traceability to NIST.
Specialized Support for Thermal Instrumentation
DRS Technologies provides elite-level support for a wide array of temperature-sensing technology:
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RTDs (Pt100/Pt1000): High-accuracy verification of resistance-to-temperature curves.
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Thermocouples (Type J, K, T, E, R, S, N): Specialized testing including cold-junction compensation audits.
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Infrared (IR) Thermometers & Cameras: Calibration using blackbody cavities to verify emissivity accuracy.
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Digital Thermometers & Data Loggers: Verification of time-stamped thermal records for cold chain logistics.
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Thermal Mapping: On-site uniformity surveys for ovens, autoclaves, and stability chambers.
Frequently Asked Questions
What is the difference between an RTD and a Thermocouple?
An RTD (Resistance Temperature Detector) uses a fine wire (usually platinum) to measure temperature based on resistance changes; it is highly accurate and stable. A Thermocouple uses two dissimilar metals to create a voltage ($mV$); it is more rugged and can measure much higher temperatures. We calibrate both using specific standards tailored to their unique electrical properties.
How often should temperature sensors be calibrated?
The industry standard is a six to twelve-month interval. However, sensors used in extreme heat ($>500^\circ\text{C}$) or corrosive environments may require quarterly calibration due to accelerated metal fatigue and drift.
What is “Dry Block” vs. “Liquid Bath” calibration?
Dry blocks are portable and excellent for field service, while liquid baths offer superior stability and uniformity for high-precision laboratory work. DRS Technologies selects the method that best matches the accuracy class of your instrument.