Isotech Temperature Calibration and Measurement

Isotech Temperature Calibration and Measurement are the standards in temperature calibration and measurement. Developing innovative solutions for calibration facilities in over 125 countries.

About Isotech Temperature Calibration and Measurement

We remain unique in our approach, not only do we manufacture equipment, but we operate our own full-scale UKAS-accredited laboratory. Operating our own laboratory has given us a deep understanding of organizations utilizing temperature calibration and measurement devices that face challenges—problems that we answer with our vast variety of calibration solutions.

Performance and quality have always been our priority, helping us earn an excellent reputation for our products. Over four decades of operation, we have received recognition in the form of several major awards. Perhaps one of our proudest moments came in 2017 when we were awarded the Queen’s award for Enterprise for the development of the micro K Thermometry Bridge.

The Products of Temperature Calibration and Measurement

milliK Precision Thermometer Temperature Measurement

The milliK Precision Thermometer from Isotech sets a new standard for the high accuracy measurement and calibration of Platinum Resistance Thermometers, Thermistors, Thermocouple and Process Instrumentation (4-20mA) over the range -270°C to 1820°C.

Isotech Temperature Calibration and Measurement
milliK Precision Thermometer

The milliK has two input channels for sensors and a third channel for current. It can be expanded to become a measuring system with up to 33 channels reading SPRTs, RTDs, Thermistors, or Thermocouples with the option to control calibration baths and log readings accurately. In addition to low uncertainty measurements from Reference Standards and Industrial sensor measurements, the milliK can control Isotech temperature sources, sequence through a programmable list of temperature set points, and log data to internal memory or a USB drive.

  • Wide Range of Sensors
    SPRTs, PRTs, Thermistors, Thermocouple and 4 – 20mA
  • High Accuracy
    < ±5ppm for PRTs, ±2μV for Thermocouples and ±1μA Transmitters
  • Logs – Controls Isotech Temperature Sources
    Massive logging capacity – controls Dry Blocks and Liquid Baths
  • Benefiting You
    The milliK sets a new standard for value, versatility and accuracy – < ±5ppm over range for PRTs, ±2μV for Thermocouples and ±1μA for current transmitters, see Data Sheet.

Supporting a wide range of sensors and functions it replaces individual devices making a cost effective calibration solution.
A robust design and operation from AC or DC power allows the milliK to be used in the laboratory, test room or out in the field.

The milliK can display in °C, °F, K, Ohms, mV and mA with numeric and graphical display modes. The large back lit display makes configuring the instrument and setting the scrolling strip charts intuitive. The USB port allows for the use of a mouse, keyboard or USB Drive.

No Compromise Design
The design team have considered industrial users and applications in order to avoid measurement errors and problems encountered in some instruments from other manufacturers:

  • Eliminates Thermal EMF Errors in PRTS
    Fast current reversal technology and solid state switching eliminate thermal EMF effects avoiding the errors that occur with fixed DC instruments.
  • Lead Wire Correction
    PRT lead wire errors are eliminated for up to 30m of four core screened cable.
  • Galvanic Isolation
    Not only are the two sensor channels galvanically isolated, the 4 – 20mA input is also separately isolated. The benefits of the advance design are no ground loops, improved safety and noise immunity.
  • High Resolution
    The display resolution is 0.0001°C (0.1mK) made possible by using a powerful Sigma Delta Analogue to Digital converter to achieve a true measuring resolution of just 28μΩ equivalent to 0.00007°C (0.07mK) for PRT inputs.
  • USB Port
    To simplify data entry simply connect a mouse and or keyboard – or a USB Drive to export logged data.

TTI-22 Temperature Measurement

Quite simply the Isotech TTI-22 High Accuracy Thermometer sets new standards in the price-to-performance ratio for industrial and secondary resistance thermometry. If you need high accuracy at an affordable price you have to look at the TTI-22.

Isotech Temperature Calibration and Measurement
TTI-22 Temperature Measurement

The TTI-22 has an accuracy of 0.001°C and a resolution of 0.0001°C (0.00004 Ohms). It has two input channels, is lightweight (1.8kg), and will operate for more than 10 hours from two small AA cells. It has both RS232 and Ethernet ports. Simple to use, supporting both Industrial 100 Ohm probes and SPRTs to ITS-90, 25.5, and 100 Ohm. Up to 30 probe calibrations can be stored along with the calibration expiry date so the instrument can warn when the calibration time has been exceeded. Built-in statistics calculation can show you both the measured and average values along with the standard deviation over previous measurements. The Isotech TTI-22 is ideal as a reference standard alongside liquid calibration baths, for the smallest uncertainty calibration with Dry Blocks or for demanding standalone measurement applications. Previously this level of performance was confined to specialist laboratories with expensive thermometry bridges; TTI-22 delivers 5 to 10 times the performance of comparably priced instruments.

  • The TTI-22 uses the same patented measurement technique as the earlier TTI-2.
  • Each measurement performs a zero point and gains correction.
  • The switched polarity DC measuring current (0.4mA) eliminates thermal EMFs.
  • Surface mount construction ensures long-term reliability.

microK Gold Thermometry Bridges

Confidence in Thermometry Bridges
The microK range of thermometry bridges have rapidly established themselves as the number one choice for temperature metrologists. Many NMIs are now using the new drift free microK technology and sales have exceeded our initial expectations.
Of course the microK is not the only thermometry bridge available, there are both older and newer designs of bridge and all claim advantages with performance or measuring method.

Isotech Temperature Calibration and Measurement
microK Gold Thermometry Bridges

AC or DC Measurement
In the past it was the case that AC Bridges operated with lower noise than DC bridges but the microK uses a new parallel processing technique to match or exceed that which previously needed impedance matching and the use of transformers.

Different manufactures claim performance in different ways and it can be confusing to compare specifications. With the availability of the automatic resistance bridge calibrator more and more bridges are being calibrated with reports published, the microK is consistently shown to exceed its specification, which is not the case for all! Ask us for the latest reports.

With claim and counter claim we want to give you confidence and have introduced the microK GOLD package. With microK GOLD you get

  • Best Performance – less than 30ppb ratio accuracy – drift free
  • Evidence – shipped with a report documenting the performance Recalibration in years two and three included – return for further evidence
  • Three Year Warranty

Now with the RBC Bridge performance can be measured – with microK GOLD you get evidence at the time of delivery and you can return it for recalibration in year two and three. Guaranteed and documented performance with a unique satisfaction promise.

microK Precision Thermometry Bridge

The microK 70 and 125 models are designed for the Primary Temperature Laboratories whilst the microK 250 and 500 models were designed for the Secondary Laboratory as well as a wide range of high accuracy industrial and scientific calibration applications. The instruments use a completely new measurement technique to achieve accuracies better than 0.02 parts per million (ppm). In April 2017 Isotech won a Queen’s Award for Enterprise in the Innovation category for the co-development of the microK, read more in our news section.

Isotech Temperature Calibration and Measurement
microK Precision Thermometry Bridge

When used with a 0°C cold junction reference unit, or by measuring the junction temperature with a PRT on another channel the instrument is capable of low uncertainty precision thermocouple measurements, with a voltage uncertainty of just 0.25μV, equivalent to 0.01°C with a Platinum / Gold Thermocouple at 1000°C.

The microK range consists of four instruments offering a choice of measurement accuracy of 0.07 to 0.5ppm over the whole range, equivalent to 0.07mK to 0.5mK over the whole range of an SPRT with a Ro >2.5Ω. Better at unity ratio.

The instruments in the microK range offer performance characteristics and features which are simply not available elsewhere. Comparable instruments available internationally do not achieve the same accuracy or stability (zero drift characteristics with SPRT measurements are not obtainable in any other instrument), other instruments do not support the same variety of sensors, and offer considerably less operational features. The microK family uses solid state construction with no potentiometers or relays which ensures long term reliability and low cost of ownership, a feature of growing international importance.

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