I'm designing a thermometer for presicion application. I found that I can to use a Wheatstone bridge design using a presicion resistor of manganine. I tried to find a form to obtain this device but is very difficult, or expensive. Somebody know where is possible to buy it or a different material or design?
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Measurement of temperature with Manganine sensor.
- Thread starter josherre
- Start date
josherre,
Generally Maganin Gages are generally used for high pressure/shock wave detection due to their inherent low strain sensitivity but have a high sensitivity to hydrostatic pressure.
You should be utilizing something more specific & accurate like an RTD (Resistance Temperature Detector)or TG Temperature Sensor. They are very accurate and have fast response time. They can measure surface temps from -452 F to ~+500 F.
The cost would be ~$60 for the temperature sensor and then you should employ a LST matching network for ~$60 again.
All these can be purchased from or the HBM company in Europe are also excellent but not as accessible.
Generally Maganin Gages are generally used for high pressure/shock wave detection due to their inherent low strain sensitivity but have a high sensitivity to hydrostatic pressure.
You should be utilizing something more specific & accurate like an RTD (Resistance Temperature Detector)or TG Temperature Sensor. They are very accurate and have fast response time. They can measure surface temps from -452 F to ~+500 F.
The cost would be ~$60 for the temperature sensor and then you should employ a LST matching network for ~$60 again.
All these can be purchased from or the HBM company in Europe are also excellent but not as accessible.
- Thread starter
- #3
Thanks barbarian, but may be I wasn't clear, I will use a RTD thermometer to measure temperature, but I need a mean to "manipulate" the electrical signal that I will obtain from this thermometer. I thought to use a Weastone bridge to conditioning voltage signal obtained from this arrange.
A friend advise me a resistor of manganine 'cause it is very steady to temperature changes, but is hard to find an appropiate resistor of this material.
A friend advise me a resistor of manganine 'cause it is very steady to temperature changes, but is hard to find an appropiate resistor of this material.
your friend is describing an old material ('manganin' a copper,nickel, manganese alloy) commonly used for wire wound resistors 50-60 years ago.
it had a reduced tempersature coefficient used for its temperature coefficient (~ +/- 0.0002 dR/R per deg. C).
believe other materials and methods have replaced it.
you can purchase a precision RTD and calibrated transducer with display for a fraction of the cost that you can build one. the benefit: traceable accurracy.
you'll need to quantify your accuracy requirement.
it had a reduced tempersature coefficient used for its temperature coefficient (~ +/- 0.0002 dR/R per deg. C).
believe other materials and methods have replaced it.
you can purchase a precision RTD and calibrated transducer with display for a fraction of the cost that you can build one. the benefit: traceable accurracy.
you'll need to quantify your accuracy requirement.
Josherre
If you already have the RTD (PT-100) or equivalent, stop by Mescon Technology and order for less then 100$ the transmitter you need.
If you already have the RTD (PT-100) or equivalent, stop by Mescon Technology and order for less then 100$ the transmitter you need.
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