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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.

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 measurement the milliK can control Isotech temperature sources, sequencing 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.


Technical FeatureValue
Input Channels3
Channels 1 + 2SPRTs, PRTs, Thermistor and Thermocouples
Channel 3Process inputs 4 – 20mA Isolated 24VDC Power Supply Included
RangesSPRTs: 0-115Ω PRTs: 0-460Ω Thermistors: 0-500kΩ 4-20mA: 0-30mA
Display Units°C, °F, K, Ω, mV, mA
AccuracyInitial – Over 1 year
SPRTs/PRTs5ppm – 7ppm
Thermistors50ppm – 150ppm
Thermocouples2μV – 4μV
4-20mA0.01% – 0.02%
Temperature Accuracy:Initial – Over 1 year:
SPRTs/PRTs (at 0°C)3mK – 4mK
(over full range)5mK – 7mK
Thermistors:50ppm – 150ppm
Type B:±0.23°C – ±0.46°C
Type E:±0.03°C – ±0.06°C
Type J:±0.04°C – ±0.07°C
Type K:±0.05°C – ± 0.10°C
Type L:±0.04°C – ± 0.07°C
Type N:±0.06°C – ± 0.12°C
Type R:±0.17°C – ± 0.34°C
Type S:±0.19°C – ±0.38°C
Type T:±0.05°C – ±0.09°C
Au-Pt:±0.12°C – ±0.23°C
Resistance (PRTs):0.00001Ω
Temperature Conversions:
PRTs:IEC60751 (2008), Callendar-Van Dusen, ITS90
Thermocouples:IEC584-1 1995 (B, E, J, K, N, R, S, T), L, Au-Pt
Thermistors:Steinhart-Hart, polynomial
Sensor Currents:
SPRTs/PRTs:1mA and 1.428mA ±0.4% (reversing)
Thermistors:5μA (reversing)
Keep-Warm Current:
SPRTs/PRTs:1mA and 1.428mA
Input Connectors:
SPRTs/PRTs:LemoEPG. 1B.306. HLN 6-pin gold plated contacts
Thermocouples:Miniature Thermocouple socket (ASTME 1684-05)
4-20mA:4mm sockets
Interfaces:10/100MBit Ethernet (RJ45 socket) USB (2.0) Host. 2 x RS232 (9-pin D-type plug, 9600 Baud)
Display:89mm / 3.5 QVGA (320 X 240) colour TFT LCD with LED backlight
Operating Conditions:
Operating:0 – 45°C / 32-113°F, 0-95% humidity
Full Specification:15-30°C / 50-85°F, 10-90% humidity
Statistics:In addition to Instantaneous Display user can select mean of 2-100 measurements with Standard Deviation.
Measurement Time:950mS
Cable Length:Limited to 10Ω per core and 10nF shunt capacitance (equivalent to 100m of typical 4-core screened PTFE cable)
LoggingCapacity to store > 180 days of time stamped measurements to internal memory
Recommended Probes:Isotech Semi Standard PRTs, Isotech Model 909 SPRT
Power:88-264V (RMS), 47-63Hz (universal), 6W maximum or 4 x AA cells
Dimensions:255mm x 255mm x 114mm / 10
Weight:2.25kg / 5lb
Optional Carrying Case:931-22-102




milliK Precision Thermometer

-270°C to 1820°C

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.

  • Wide Range of Sensors, SPRTs, PRTs, Thermistors, Thermocouples and 4-20mA Transmitters
  • High Accuracy, < ±5ppm for PRTs, ±2µV for Thermocouples and ±1µA for Transmitters
  • Logs and Controls Isotech Temperature Sources Massive logging capacity - supports Dry Blocks and Liquid Baths

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