Precision Thermocouple Amplifiers with Cold Junction Compensation – Temperature Range −25°C to +400°C
This Thermocouple Amplifier project provides a simple, low-cost solution for measuring thermocouple temperature. This board simplifies many of the difficulties of measuring thermocouples output. An integrated temperature sensor performs cold junction compensation. A fixed-gain instrumentation amplifier amplifies the small thermocouple voltage to provide a 5 mV/°C output. The high common-mode rejection of the amplifier blocks common-mode noise that the long thermocouple leads can pick up. For additional protection, the high impedance inputs of the amplifier make it easy to add extra filtering. The module can be used as standalone thermometers or as switched output setpoint controllers using either a fixed or remote setpoint control. The module can be powered from a single-ended supply (less than 3V) and can measure temperatures below 0°C by offsetting the reference input. To minimize self-heating, an unloaded AD8495 typically operates with a total supply current of 180 μA, but it is also capable of delivering in excess of ±5 mA to a load. The board can be interfaced with K-type (chromel-alumel) thermocouples. With an operating single supply of 5V, the 5 mV/°C output allows the devices to cover nearly 1000 degrees of a thermocouple’s temperature range. The project can also work with 3V supplies, allowing them to interface directly with lower-supply ADCs. They can also work with supplies as large as 36V in industrial systems that require a wide common-mode input range. The AD8495 cold junction compensation is optimized for operation in a lab environment, where the ambient temperature is around 25°C. The AD8495 is specified for an ambient range of 0°C to 50°C.
Features
- Supply Dual 5V DC (+/-5V DC)
- Low cost and easy to use
- Measurement Temperature Range −25°C to +400°C
- ±2°C Accuracy Temperature Ranges
- Pretrimmed for K-type thermocouples
- Internal cold junction compensation
- High-impedance differential input
- Standalone 5 mV/°C thermometer
- Reference pin allows offset adjustment
- Mode: Linear, Set Point Controller, Hysteresis on Setpoint Controller, Selection Using Jumpers
- Thermocouple break detection
- On Board Power LED
- 4 x 2.5mm Mounting Holes
- PCB Dimensions 31.12 x 27.31mm
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This Thermocouple Amplifier project provides a simple, low-cost solution for measuring thermocouple temperature. This board simplifies many of the difficulties of measuring thermocouples output. An integrated temperature sensor performs cold junction compensation. A fixed-gain instrumentation amplifier amplifies the small thermocouple voltage to provide a 5 mV/°C output. The high common-mode rejection of the amplifier blocks common-mode noise that the long thermocouple leads can pick up. For additional protection, the high impedance inputs of the amplifier make it easy to add extra filtering. The module can be used as standalone thermometers or as switched output setpoint controllers using either a fixed or remote setpoint control. The module can be powered from a single-ended supply (less than 3V) and can measure temperatures below 0°C by offsetting the reference input. To minimize self-heating, an unloaded AD8495 typically operates with a total supply current of 180 μA, but it is also capable of delivering in excess of ±5 mA to a load. The board can be interfaced with K-type (chromel-alumel) thermocouples. With an operating single supply of 5V, the 5 mV/°C output allows the devices to cover nearly 1000 degrees of a thermocouple’s temperature range. The project can also work with 3V supplies, allowing them to interface directly with lower-supply ADCs. They can also work with supplies as large as 36V in industrial systems that require a wide common-mode input range. The AD8495 cold junction compensation is optimized for operation in a lab environment, where the ambient temperature is around 25°C. The AD8495 is specified for an ambient range of 0°C to 50°C.
Features
- Supply Dual 5V DC (+/-5V DC)
- Low cost and easy to use
- Measurement Temperature Range −25°C to +400°C
- ±2°C Accuracy Temperature Ranges
- Pretrimmed for K-type thermocouples
- Internal cold junction compensation
- High-impedance differential input
- Standalone 5 mV/°C thermometer
- Reference pin allows offset adjustment
- Mode: Linear, Set Point Controller, Hysteresis on Setpoint Controller, Selection Using Jumpers
- Thermocouple break detection
- On Board Power LED
- 4 x 2.5mm Mounting Holes
- PCB Dimensions 31.12 x 27.31mm
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