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temperature measurement:digital temperature calibration thermometers, thermometry bridges and Automated Temperature Calibration software

 

                      image of Automatic Systems Laboratories logo  image of Dostmann electronic logo   image of calisouk.com logo

If you are looking to replace an existing thermometer or thermometry bridge, or looking to set up a new in house temperature calibration laboratory to bring your organisation up to ISO 9000 standards, or maybe to bring this functional requirement back in-house, we can offer you our advice and guidance on the most appropriate precision thermometer or resistance thermometry bridge to achieve this based on our understanding of your uncertainty budget.

We offer a wide range of temperature probes with various lengths and diameters to chose from to complete the reference thermometer system.

If you require a temperature calibration heat source, we have a range of metal block temperature calibration baths for you to choose from, spaning different temperature ranges from -40C up to 1200C, enabling you to calibrate subordinate themometers against your reference thermometer. Full details on these block baths can be found on the Temperature Calibration Block Baths page.

Please request a copy of the product data sheet, either by phoning 01767 692692, email or use the Contact us link, filling in the details as required.

If you also like the idea of automated temperature calibration then the Caliso Temps software will enable you to achieve it.

 

You may find Guidelines for obtaining the best performance from RTDs, Prt's and Pt100’s in particular, a Sensing Devices (SDL) Ltd publication, to be of interest.


Precision Temperature Calibration Thermometers, Resistance Thermometry Bridges

ASL F900 Super Primary Standards Thermometry Bridge

The Model F900 is designed specifically for resistance thermometry to provide you with the best possible accuracy.

Accuracy: 20ppb (+/- 5 micro K)

image of ASL F900 super  primary standards resistance bridge

ASL F18 Primary Standards Thermometry Bridge

The F18 includes a wide range of features specifically tailored for temperature metrology.

Accuracy: 0.1ppm (+/- 25 micro K)

image of ASL F18 Primary standards resistance bridge

ASL F600  Secondary Standards AC & DC Thermometer Bridge

Accuracy: up to ±0.5mK
Resolution: 0.1mK

DC version for thermisor measurement.

image of ASL F600 AC/DC Resistance Bridge

ASL F700 Secondary Standards Thermometer Bridge

Accuracy: +/-5 micro K over full range

Resolution:0.25 micro K over the full range

image of ASL F700 Secondary standards Resisitance Bridge

 

Platinum Resistance Thermometers (Prt's)

ASL provides a full range Platinum Resistance Thermometers (PRTs) for use in every application from standards calibration to site temperature measurement.

image of ASL Pt100 resistance probe

Precision Reference Resistors

ASL provides a range of Standards Resistors for use when calibrating Platinum Resistance Thermometers.

image of ASL calibration resistor

Dostmann DDM 1000 Precision Thermometer

Accuracy:0.1mK

Resolution:0.02mK

image of Dostmann DDM1000 precision thermometry bridge

Dostmann DDM900 Precision Thermometer

Accuracy: ±0,005°C

Resolution: 0,001C

Dostmann T4200 Precision Thermometer

Accuracy: +/- 10mK

Resolution: 0.001°C

Image of Dostmann T4200 Precision thermometer

ASL F200 Precision thermometer

Accuracy:0.01C

Resolution:0.001C

image of ASL F200 precision bench top thermometer

ASL F100 Thermometer

Accuracy:0.02C

Resolution:0.001C

image of ASL F100 digital thermometer

ASL F100 Thermometer Deals:

Two deals are available, call us for full details.

 

 

image of ASL F100 thermometer deals

Dostmann T905 Bench Top Instrument

The T905 Bench Top Instrument for Pt100, thermocouple types J, K, L, N, R, S, T.

  • Measuring Range: -200°C to + 1760°C
  • Accuracy: +/- 0.1°C
  • Resolution: 0.1°C
  • RS232 Digital output
  • 0-1VDC Analogue output
  • Integrated sensor calibration.

 

image of Dostmann T905 bench top digital thermometer

Dostmann T955 Bench Top Instrument

The T955 Bench Top Instrument for Pt100 & thermocouple types J, K, N, L, R, S, T, Humidity & Airflow.

  • Measuring Range : -200°C to +1760°C
  • 0-100% RH
  • 0-40m/s
  • Accuracy +/-0.03°C
  • +/-1.5& RH
  • +/-0.5m/s
image of Dostmann T955 bench top digital thermomrter

Dostmann P795 Precision Thermometer/Logger with "tare" function.

2 Channels for Pt100 probes.

Accuracy:0.015C (-50C ..+199.99C) otherwise 0.025%

Resolution: 0.001C. (0.01C above +199.99C)

Memory with realtime clock...appr. 6000 measurements.

"Smart probes" available- calibration data stored in eeprom.

image of Dostmann P795 precision  thermometer/logger

Caliso "Temps" Automated Temperature Calibration Software

"It does what it says on the tin"

Caliso Temps is made up of 2 separate programs:

Laboratory Interface where you connect your instruments and carry-out your calibration. A wide range of manufacturers hardware are supported, including web- cam support for equipment such as LIG thermometers or digital indicators which have no digital interface.

Builder where you analyse your data, perform calculations, and also design and make calibration certificates.

image of caliso uk logo

                                                                                                

Making precise temperature measurement or validating temperature products has never been easier with the precision thermometry systems we supply.

20 Years exprience in supplying temperature measurement & calibration products to industry & UK National Laboratories.

 

          Please request a copy of the product data sheet, either by phoning 01767 692692, email or use the Contact us link, filling in the details as    

          required.

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5 Swan Lane, Sandy, Beds, SG19 1NE   
  Tel: (01767) 692692   Fax: (01767) 691831

In choosing the correct hand held digital thermometer it is important to consider the uncertainties that can be permissible (uncertainty budget) for the measurement process.

If we are to use a digital thermometer for calibration of other subordinate thermometers, then the system accuracy of the reference thermometer, over the working temperature range of the device under test or calibration, will need to be at least 3 to 4 times better.

In general the accepted method of calibrating thermometers is to immerse both the reference thermometer system ( probe) and the thermometer under test (probe), in either  a metal block temperature calibration bath (sometimes referred to as a  drywell block calibrator), or in a stirred liquid calibration bath, known as calibration by comparison. Both types of bath have their own merits (and associated costs).

For primary  temperature calibration (national standards maintained at NPL) and secondary standards laboratories (UKAS accredited), temperature calibration of individual thermometers is carries out by immersing a high purity platinum precision resistance thermometer or high purity working standard thermometer into fixed point cells, which have extremely precise known temperature values: tripple point of water at 0,010000C, melt point of gallium, freezing point of indium, tin, zinc aluminium, silver, gold and copper at 1084.620C. Sub zero values are derived from the mercury tripple point at -38.83440C to the hydrogen tripple point at -259.3467C. Silver point being the highest value for realising temperature using a Platinum Resistance Thermometer in the ITS 90

Temperature Scale.

Usually the resistance thermometer is connected to a direct temperature read out bridge such as the ASL F600 or Dostmann DDM100 etc. or to a resistance thermometry bridge where the resistance of the thermometer is measured and then balanced against either an internal or an external high precision four wire resistor, which the bridge then indicates a resistance ratio value to several decimal places. This value can them be converted back into temperature by look up tables of resistance to temperature.

For industrial applications, temperature calibration will normally be carried out either at an in house facility with trained personnel skilled in temperature measurement and calibration and probably UKAS accredited, or off site at a UKAS laboratory, or at least a laboratory with a reference thermometer traceable to a UKAS lab.

It is important when choosing a temperature calibration lab that has just a UKAS "traceable certification" that they are accredited for temperature calibration using either a liquid or metal block bath, and not just for electrical simulation, as the thermometer “system” needs calibration, not just the indicator.

 

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