AD8495 Thermocouple Amplifier
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1 AD8495 Thermocouple Amplifier Date: 08/01/14 Version: 1.0 By: Matt Little This Thermocouple Amplifier Kit is based upon the AD8495 precision K-type thermocouple amplifier. This can be used to measure very high temperatures, with a range up to 1000C (depending upon the rating of the thermocouple). The output is a voltage equal to 5mV per degree with a linear scale. This makes it very easy to measure with an analog input to a microcontroller (such as the Arduino). Note: No thermocouple probe is included in this kit please purchase separately for your application. Data sheet for the AD8495 is available here: Parts included: 2 x 1nf Capacitor 100nf Capacitor 10nf Capacitor 1uf Capacitor Resistors: 2 x 10k 1 x 100k 1 x 1M 100uf Capacitor 2 Way Terminal AD4895 SMD IC PCB
2 Parts list: Ref C1 C2 C3 C4 C5 C6 K1 P1 R1 R2 R3 R4 U1 Value and description 1nf capacitor 10nf capacitor (might vary from photo) 1nf capacitor 100nf capacitor 100uf capacitor 1uf capacitor DATA Solder pads Thermocouple Screw terminals for the therm 1M resistor 10k resistor 10k resistor 100k resistor AD8495 SMD K-type Termocouple Amplifier Tools required: Soldering Iron Solder Side cutters Small nosed pliers
3 Instructions: Step: 1 Solder the SMD IC AD8495 Lets start with probably the most difficult soldering step. Its best to do this first, or the other components get in the way. Holding the IC with a pair of tweezers align over the solder pads. Ensure the correct orientation the dot on the IC will be at the end with the triangle on the PCB. Solder one pin on the corner of the IC. Ensure that the IC lines up with all the other pads. If you need to adjust it then heat the solder on the soldered pin and correct the IC. Once it is aligned then you can solder the whole row of pins on the other side to the already soldered pin. If you heat up the top pin and apply solder then drag down to the bottom pin, applying solder if required. This usually will solder all the pins. You may need to remove any excess solder using some solder wick. Leave this to cool for a couple of seconds. Then use the same technique for the unsoldered side. Step: 2 Solder the resistors Identify all the resistors. You will have: Quantity Value Part Reference 1 1M R1 2 10k R2,R k R4 Use the identify chart at the end of these instructions or a multimeter. Solder into the relevant places. Their orientation does not matter.
4 Step: 3 Solder the Capacitors Identify and then solder in the capacitors. Quantity Value Reference Photo 2 1nf C1, C3 1 10nf C nf C uf C5 1 1uf C6 Capacitors C1-4 can be installed in either direction. Check the orientation on capacitors C5,C6. The white line on the side signifies negative side. The round pad on the PCB signifies negative. The longer lead signifies positive. The square pad on the PCB is positive. Step: 4 Solder the screw terminal block This will be used to connect the thermocouple wires.
5 Step: 5 Build is finished! Have a nice cup of tea. Step: 6 Test the device To test the device, connect a k-type thermocouple to the screw terminals. Apply 5V power supply to the V+ pin and GND. Measure the output with a multimeter. The output should be +5mV per degree C. In this photo I have heated the thermocouple with a hot air gun and am getting a reading of 1.373V, which equates to: 1.373V / = 274C The error is +/-2C for the range 25C-400C. Note: This version cannot measure below zero (but check the data sheet for an application note to do this). Contact details: This kit has been designed and produced by: Renewable Energy Innovation. info@re-innovation.co.uk Hopkinson Gallery 21 Station Street Nottingham NG7 6PD We would like you to be happy with this kit. If you are not happy for any reason then please contact us and we can help to sort it out. Please info@re-innovation.co.uk with any questions or comments. If any parts are missing from your kit then please info@re-innovation.co.uk with details, including where the kit was purchased. More technical information can be found via
6 Useful Information: Resistor colour codes:
7 Circuit schematic:
8 PCB overview:
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The new Velleman Projects catalogue is now available. Download your copy here: www.vellemanprojects.eu
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