NABL Ready Temperature Calibration Bath (-80°C)
Indeecon's liquid calibration baths deliver extraordinary precision across four models spanning -100°C to +270°C — with stability as tight as ±0.005°C (L-CRIO-100) and uniformity of ±0.010–0.030°C. Dual-stage cascade refrigeration, high-torque variable-speed stirrers with vertical laminar flow, vacuum-insulated observation ports, and capacity for 10–15 simultaneous sensors make our baths the primary standard for ISO/IEC 17025 NABL calibration laboratories.
Liquid calibration baths are precision thermal vessels filled with temperature-stable liquids (ethanol, methanol, oil, water-glycol blends) used to calibrate and verify temperature sensors. The liquid surrounding sensors provides uniform thermal contact—unlike dry blocks that rely on point contact. This makes liquid baths the primary standard for sensor calibration. Indeecon offers four core models covering -100°C to +270°C with stability down to ±0.005°C, meeting ISO/IEC 17025 and NABL calibration laboratory requirements.
Key Specifications
- Temperature: -80°C to 50°C
- Stable bath uniformity for accurate calibration
- Suitable for RTD, thermocouple and probe calibration
- Standalone design for lab and shop-floor use
- Built for repeatable calibration performance
- Range: -80°C to +50°C
- Stability: ±0.05°C
- Uniformity: ±0.05°C
Key Features
- Four Model Range: L-CRIO-100 (-100°C to +40°C, ±0.005°C) | L-ULT-80 (-80°C to +60°C, ±0.010°C) | L-REF-30 (-30°C to +100°C, ±0.015°C) | L-OIL-270 (ambient to +270°C, ±0.020°C)
- Dual-Stage Cascade Refrigeration: Achieves -100°C deep cryogenic temperatures with exceptional stability — enables calibration of aerospace and research cryogenic sensors
- High-Torque Variable-Speed Stirrer: Vertical laminar flow prevents mixing turbulence and thermal gradients — achieves ±0.010–0.030°C uniformity across the calibration volume
- 10–15 Simultaneous Sensor Capacity: Calibrate RTDs, thermocouples, NTC thermistors, and data loggers in one run — vs. 2–3 sensors typical in dry-block calibrators
- Vacuum-Insulated Observation Port: Frost-free viewing windows in cryogenic models allow real-time sensor monitoring without condensation during overnight unattended calibration runs
- Intelligent Level Control: Automatic monitoring prevents oil expansion overflows, dry-run pump damage, and unplanned shutdown during thermal cycling
- NABL Calibration Ready: ISO/IEC 17025 uncertainty budget pre-certified; RS-232 / Modbus TCP output for LIMS integration
- Primary Standard Recognition: Full sensor immersion in temperature-stable liquid provides superior calibration accuracy vs. point-contact dry blocks
Understanding Traceability & NABL Accreditation
Temperature sensor calibration is only as credible as its traceability chain. A NABL ready temperature calibration bath supports this chain in three ways:
- ITS-90 traceability — All temperature measurements reference the International Temperature Scale of 1990, the global standard for temperature metrology.
- NIST-traceable reference standards — Calibration results can be traced back through an unbroken chain of comparisons to national measurement institutes.
- Pre-certified uncertainty budget — ISO/IEC 17025 requires labs to state measurement uncertainty; a pre-certified budget on the bath itself simplifies your lab's accreditation documentation significantly.
This traceability is what separates a precision calibration instrument suitable for accredited lab use from a general-purpose temperature bath — and it's the core reason ISO/IEC 17025 and NABL-accredited labs specify liquid baths as primary reference standards rather than working standards.
Compliance Standards
- ISO/IEC 17025 — NABL calibration laboratory readiness; uncertainty budget pre-certified
- ITS-90 — International Temperature Scale of 1990 traceability
- NIST Traceability — Through international calibration networks
- ISO 5725 — Measurement Repeatability and Reproducibility
- IEC 61010-1 — Laboratory Equipment Safety
Applications
- Temperature Sensor Calibration: RTDs, thermocouples (all types), NTC thermistors, PT100/PT1000 — simultaneous multi-sensor calibration in a single run
- Industrial Thermometer Verification: Process thermometers, digital indicators, and temperature transmitters for QMS compliance
- Data Logger & Temperature Indicator Calibration: Traceable calibration for ISO 9001 and IATF 16949 measurement system requirements
- Pharmaceutical & Food Safety Testing: Temperature-controlled environment validation; cold chain instrument calibration
- Aerospace & Defence Sensor Certification: Cryogenic sensor calibration for avionics and ground support equipment
- ISO/IEC 17025 Calibration Laboratories: Primary reference standard bath for NABL-accredited laboratory operations
Safety Features
- Over-temperature protection and alarms
- Electrical safety protections for heaters and controls
Optional Features
- Multiple bath sizes and insert options
- Calibration traceability documentation support
- External reference probe integration
- Custom temperature ranges as per requirement
How It Works
- Set the required temperature on the controller
- Allow the bath to stabilise at the setpoint
- Insert the sensor/probe into the bath medium
- Compare readings against a reference standard
- Record results for calibration and traceability documentation
Datasheets & Resources
- Temperature Range
- Stability / Uniformity
Frequently Asked Questions about Temperature Calibration Bath
What's the difference between L-CRIO-100 and L-ULT-80?
L-CRIO-100 reaches -100°C with ±0.005°C stability for ultra-cryogenic applications. L-ULT-80 reaches -80°C with ±0.010°C stability. Choose based on your lowest required temperature.
Can I calibrate multiple sensor types simultaneously?
Yes. The liquid bath accommodates RTDs, thermocouples, NTC thermistors, and other sensors simultaneously. All immersed sensors stabilize to the same temperature.
How do I avoid oil degradation in the L-OIL-270 model?
Use premium synthetic silicone oils (food-grade or laboratory-grade). Indeecon recommends oil change every 2 years or 2000 hours, whichever comes first. We supply certified oils.
Can the baths be integrated with data logging systems?
Yes. All models feature digital temperature outputs (RS-232 / Modbus TCP available). Integration with LIMS and calibration software is straightforward.
Schedule a Calibration Bath Demonstration
See precision calibration in action—contact our calibration specialists
What makes this a NABL ready temperature calibration bath?
The bath's uncertainty budget is pre-certified to ISO/IEC 17025 requirements, with ITS-90 and NIST traceability built into the calibration process — meeting the documentation and repeatability standards NABL-accredited laboratories require for accreditation audits.
How does precision calibration in a liquid bath compare to a dry block calibrator?
A liquid bath achieves precision calibration through full sensor immersion in a temperature-stable medium, giving uniform thermal contact across the entire sensor body — typically ±0.005°C to ±0.020°C depending on model. Dry block calibrators rely on point contact, which is faster to set up but generally less accurate for multi-point or non-standard sensor geometries.
How often should a temperature calibration bath itself be recalibrated?
Most NABL and ISO/IEC 17025 accredited labs recalibrate the reference bath annually, though high-use or critical applications may require 6-month intervals. Indeecon supplies calibration traceability documentation to support your accreditation renewal schedule.
What's the difference between a liquid calibration bath and a dry block calibrator?
A liquid calibration bath fully immerses the sensor in a temperature-stable liquid for uniform thermal contact, while a dry block calibrator uses point contact via metal inserts. Liquid baths generally deliver better precision calibration and support simultaneous multi-sensor calibration; dry blocks are more portable and faster to set up for field use.
What accuracy can I expect from precision calibration in a liquid bath?
Accuracy depends on the model — Indeecon's range spans ±0.005°C (L-CRIO-100, cryogenic) to ±0.020°C (L-OIL-270, high-temperature oil bath). Precision calibration accuracy also depends on reference probe quality and calibration procedure, not the bath alone.
What documentation do I need for NABL accreditation using this bath?
You'll typically need the bath's calibration certificate with traceability to national/international standards (ITS-90, NIST), an uncertainty budget, and periodic recalibration records. Indeecon provides calibration traceability documentation support as part of the NABL ready configuration.
Related Guides
Continue your evaluation with the most relevant master pages, comparison guides, and technical resources for this product family.
- Calibration Equipment Guide — Dry block calibrators and liquid baths — equipment families, temperature ranges, and selection factors.
- Temperature Calibration Guide — Traceability, uncertainty, and temperature calibration fundamentals.
- Calibration Selection Guide — Select equipment by range, stability, and application constraints.
- Dry Block vs Liquid Bath — Compare portability, accuracy, immersion, and temperature coverage.