The compact head mounted transmitter type from ABB is designed for standard type B sensor heads. The advantage increased measuring accuracy resulting from conversion of the sensor signal into a stable output signal close to the sensor. For thermocouple applications without compensation cables.
 | TR04 | TTH200 | TTH300 |
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| Input functionality | | | |
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| 1 sensor / 2 sensors | l / - | l / - | l / l |
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| sensor backup / redundancy | | | l |
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| sensor drift monitoring | | | l |
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| customer specific curve | | | l |
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| Input | | | |
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| RTD (e.g. Pt100 ) | l | l | l |
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| Thermocouple | | l | l |
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| Ohm | | l | l |
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| mV | | l | l |
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| Output | | | |
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| 4 ... 20mA / HART | l / - | l / l | l / l |
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| PA | - | - | l |
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| FF | - | - | l |
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| programmable | | l | l |
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| Approvals | | | |
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| ATEX | l | l | l |
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| FM | l | l | l |
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| CSA | l | l | l |
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| GOST | l | | l |
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| SIL 2/3 | | l | l |
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