Temperature Logger modification

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Soldering iron and solder. 2 wire cable (high temperature). Very small phillips screwdriver (jewellery size). I also used an electric roast temperature probe that was supplied with a microwave. Designed for. +140 °c with silicone covered cable. the thermistor inside has a different resistance and reads an estimated +38 °c over ...

Temperature Logger modification For many years I have been searching for temperature recording equipment, there was a lot of types available, such as old paper chart recorders. For computers there are various types, some expensive, single channel, DIY requiring programming, ADC Analog to Digital Converters with poor voltage sensitivity at thermocouple levels, and requiring a power supply to take records. I came across the 3M temperature logger while looking through an Office stationary supplies catalog. They are usually put with heat sensitive goods in a parcel for posting, the temperature logger records the temperature at user set intervals. The parcel receiver can download the recorded log with a special USB cable. The Temperature loggers come in boxes of five, and require the special USB cable which comes in a bag of two. The loggers contain a battery. One limitation to modify, of the TL20 temperature loggers is the + 60 °c maximum temperature. This limit is for the case and battery, the sensor can measure far higher. Up to around 140 °c, this makes the logger practical to measure temperatures in factory situations and school laboratory experiments. Requirements: Time: 30 minutes per logger Box of 5 3M TL20 Temperature loggers 3M TL20 temp. logger USB cable Windows computer Software from 3M website Soldering iron and solder 2 wire cable (high temperature) Very small phillips screwdriver (jewellery size) I also used an electric roast temperature probe that was supplied with a microwave. Designed for +140 °c with silicone covered cable. the thermistor inside has a different resistance and reads an estimated +38 °c over actual. To make measurements in liquids such as water, the sensor will need covering, the logger case can be located safely away. Note: leaving the logger plugged into the USB cable will drain its battery. Having 5 loggers allows simultaneously measurement of ambient and then 4 more areas. On a machine such as a 3 way absorption refrigerator, one inside the freezer, one on the middle radiator, one on the top radiator, the most heatproof on the generator element. Carefully placed to not damage the machine. A whole range of effects can be measured, such as insulation losses. Maximum hot/cold. Temp vs time factor, when heating fresh water ice, showing temperature increase is not linear (at the change of state points). Is coffee hotter when milk is poured in first? Or did the boiling water cool quicker when poured into a china mug? The enthalpy of evaporation. Andrew Townsend New Zealand

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