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microK2

microK² Precision Thermometry Bridge

The microK² builds on the success of the original microK models that were quickly adopted by leading National Metrology Institutes and commercial laboratories. Retaining Isotech’s proven measurement technology, and capable of uncertainties as low as 7.5 μK, the microK² remains a first choice for work with SPRTs and supports all standard thermometer types including standard thermocouples, industrial PRTs and thermistors.

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microK² Precision Thermometry Bridge

Features

  • Accuracy and Stability: Superior resistance ratio accuracy and zero drift to ensure long-term stability
  • Trusted by NMIs: Widely recognised by leading NMIs with independent reports validating its exceptional performance
  • Choice of four performance levels, offering the right balance of accuracy, capability and budget for any laboratory
microK² Precision Thermometry Bridge

Description

The microK² introduces several developments designed to enhance usability, accuracy and flexibility. A new fourth measurement channel accepts SPRTs, reference resistors or the channel expander, broadening system capability. The touchscreen has been upgraded to a 10.1-inch high-resolution display with improved capacitive touch response, while the input terminals are now more robust and easier to use. Connectivity has also been expanded, with Ethernet, two RS232 ports and three USB ports, along with updated software features.

NEW: The microK² family is available in four performance levels, from the highest-accuracy ELITE model through to the 60, 150 and 300 variants. Full accuracy, equivalent temperature performance and detailed specifications are shown in the table and in the datasheet.

Performance by Design – Inherently Drift-Free
The microK was developed with a clear design philosophy: to deliver genuine long-term performance without relying on “tweak pots”, software adjustments or self-calibration routines. This approach results in resistance ratio measurements that are inherently drift-free, providing stable and repeatable performance over time. As a ratio bridge, the microK uses a substitution topology that eliminates drift without compensation circuits or software offsets. The instrument therefore maintains its performance without requiring adjustment or service intervention, reducing long-term operating costs.

microK² Precision Thermometry Bridge

Since its introduction in 2006, the microK platform has been rigorously studied and validated by temperature metrologists worldwide, confirming its reliability and long-term stability. For further technical detail on the microK family and its underlying design principles, visit our technical library.

microK² Precision Thermometry Bridge

microK² ELITE

Accuracy, Whole Range30 ppb
Equivalent Temperature Accuracy Whole Range / Water Triple Point30 μK / 7.5 μK

microK² 60

Accuracy, Whole Range60 ppb
Equivalent Temperature Accuracy Whole Range / Water Triple Point60 μK / 15 μK

microK² 150

Accuracy, Whole Range150 ppb
Equivalent Temperature Accuracy Whole Range / Water Triple Point150 μK / 38 μK

microK² 300

Accuracy, Whole Range300 ppb
Equivalent Temperature Accuracy Whole Range / Water Triple Point300 μK / 75 μK

COMMON Specifications

Weight13.2 kg
Resolution, Temperature0.001 mK (0.000001 °C)
Input Channels NEWFour, three front and one rear
Ratio RangeUnlimited
Ratio Accuracy StabilityZero drift
Ratio Accuracy Temperature CoefficientZero
Resistance Range0–500 kΩ
Keep-Warm CurrentEach channel individually programmable
Voltage Range (thermocouple)125 mV
Voltage Accuracy (0–20 mV)0.15 μV (≈0.006 °C for Pt/Au thermocouple at 1000 °C)
Resolution, Voltage10 nV
Cold Junction ModeExternal and remote with PRT
Sensor Current NEW0–14.2 mA per channel
Cable LengthUp to 10 Ω per core and 10 nF shunt capacitance (≈100 m RG58)
Temperature Conversions NEWPRTs: ITS-90, CvD Thermocouples: IEC 60584-1:2013 (B–T), L, Pt/Pd, Au/Pt Thermistors: Steinhart–Hart, Polynomial
Internal Resistance Standards25, 100, 400 Ω
Optional Internal Values1, 10, 10 kΩ
Internal Standard StabilityTCR <0.5 ppm/°C, drift <2 ppm/year
Input ConnectorsGold-plated 4 mm binding posts (tellurium copper), for plugs, spades or bare wire
InterfacesEthernet, 3× USB Host, 2× RS232, IEEE-488 (GPIB)
Store Calibration CoefficientsUnlimited
Datalogger32 GB
Expandable NEWUp to 90 expansion channels
Switching TechnologySolid state
UnitsRatio, V, Ω, °C, °F, K
Display10.1-inch high-resolution touchscreen, anti-glare
Operating ConditionsFull spec: 15–30 °C, 10–80% RH Operational: 0–40 °C, 0–95% RH
Power85–264 Vac, 50/60 Hz, 20 W max
Dimensions539 × 200 × 300 mm (19-inch rack mountable)

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