Testo 6681 Humidity Process Controller
Testo 6681 industrial humidity controller features Modbus connectivity and relay outputs for precise RH control in production environments. Automatically maintains humidity setpoints through proportional control of humidification systems. Classified HTS 9032.89.60.70 process control humidity instruments.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If DIN-rail relay modules without integral humidity sensing
Electrical relays/switches without measuring function classify in 8536
If non-automatic humidity indicators for manual process adjustment
Other optical/measuring instruments without feedback control in 9031
If built into commercial/industrial air conditioning units
Integral HVAC control components follow the complete machine classification
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Import Tips & Compliance
• Provide protocol specifications (Modbus, Profibus) confirming industrial process control
• Include humidity sensor accuracy certificates (±1.0% RH typical)
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