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MicroK˛ Thermometry Bridge
The MicroK˛ Thermometry Bridge builds on the proven performance of the original MicroK series, trusted by National Metrology Institutes and leading calibration laboratories worldwide. Retaining Isotech’s innovative measurement technology and user-friendly operating philosophy, the MicroK˛ delivers unmatched accuracy down to 7.5 µK for SPRTs, Standard Thermocouples, Industrial PRTs, and Thermistors.
What’s New in the MicroK˛
Designed for the next era of precision measurement, the MicroK˛ introduces powerful upgrades that enhance usability, connectivity, and flexibility:
- New Fourth Channel: Accepts SPRTs, reference resistors, or an optional channel expander, providing greater measurement versatility.
- Upgraded Display: A 10.1-inch high-resolution capacitive touchscreen delivers a brighter, faster, and more intuitive interface.
- Improved Terminals: Redesigned input connectors offer enhanced durability and easier operation.
- Expanded Connectivity: Now featuring Ethernet, two RS-232 serial ports, and three USB ports for effortless data transfer and system integration.
- Enhanced Software Tools: New software functions streamline setup, control, and long-term data management.
Performance by Design: Inherently Drift-Free
At the heart of the MicroK˛ is a substitution ratio bridge topology that ensures long-term, drift-free performance. Unlike conventional thermometry systems that rely on manual adjustments, “tweak pots,” or periodic self-calibration, the MicroK˛ is engineered to maintain accuracy without compensation circuits or software offsets.
This results in unparalleled stability and repeatability, significantly reducing calibration frequency and lifetime operating costs.
Proven Reliability and Global Validation
Since its first introduction in 2006, the MicroK series has been independently validated and published in numerous studies by temperature metrologists worldwide. The MicroK˛ continues that legacy, offering proven reliability, accuracy, and ease of use for laboratories that demand the very highest measurement standards.
Summary Highlights
- Accuracy as low as 7.5 µK
- Four-channel configuration for enhanced measurement flexibility
- Drift-free ratio bridge design: no adjustments or self-calibration required
- 10.1″ touchscreen with intuitive user interface
- Ethernet, RS-232, and USB connectivity
- Supports SPRTs, PRTs, Thermocouples, and Thermistors
- Designed and built by Isotech, world leaders in precision thermometry
| Parameter |
MicroK˛ Elite |
MicroK˛ 60 |
MicroK˛ 150 |
MicroK˛ 300 |
| Accuracy, Whole Range |
30 ppb |
60 ppb |
150 ppb |
300 ppb |
| Equivalent Temperature Accuracy, Whole Range |
30 μK |
60 μK |
150 μK |
300 μK |
| Equivalent Temperature Accuracy, Water Triple Point |
7.5 μK |
15 μK |
38 μK |
75 μK |
| Resolution, Temperature |
0.001 mK (0.000001 °C) |
| Input Channels |
Four, three front and one rear |
| Ratio Range |
Unlimited |
| Ratio Accuracy Stability |
Zero drift |
| Ratio Accuracy Temperature Coefficient |
Zero |
| Resistance Range |
0–500 kΩ |
| Keep-Warm Current |
Each 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, Voltage |
10 nV |
| Cold Junction Mode |
External and remote with PRT |
| Sensor Current |
0–14.2 mA per channel |
| Cable Length |
Up to 10 Ω per core and 10 nF shunt capacitance (≈100 m RG58) |
| Temperature Conversions |
PRTs: ITS-90, CvD
Thermocouples: IEC 60584-1:2013 (B–T), L, Pt/Pd, Au/Pt
Thermistors: Steinhart–Hart, Polynomial
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| Internal Resistance Standards |
25, 100, 400 Ω |
| Optional Internal Values |
1, 10, 10 kΩ |
| Internal Standard Stability |
TCR <0.5 ppm/°C, drift <2 ppm/year |
| Input Connectors |
Gold-plated 4 mm binding posts (tellurium copper), for plugs, spades or bare wire |
| Interfaces |
Ethernet, 3× USB Host, 2× RS232, IEEE-488 (GPIB) |
| Store Calibration Coefficients |
Unlimited |
| Datalogger |
32 GB |
| Expandable |
Up to 90 expansion channels |
| Switching Technology |
Solid state |
| Units |
Ratio, V, Ω, °C, °F, K |
| Display |
10.1-inch high-resolution touchscreen, anti-glare |
| Operating Conditions |
Full spec: 15–30 °C, 10–80% RH
Operational: 0–40 °C, 0–95% RH
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| Power |
85–264 Vac, 50/60 Hz, 20 W max |
| Dimensions |
539 × 200 × 300 mm (19-inch rack mountable) |
| Weight |
13.2 kg |
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Literature
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MicroK˛ Datasheet
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Introducing microK˛ Leaflet
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NIST – Performance Assessments Of Thermometer Resistance Bridges
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NPL – Characterisation of AC and DC resistance bridges
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MicroSkanner˛ Datasheet
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MicroK˛ Manual
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