Name	Description	Category
Testo 6651 (0555 6651) Humidity Transmitter for Critical Climate	The Highest accuracy up to ±1.0 % RH First humidity transmitter with Profibus-DP interface Self-monitoring and early warning guarantee high system availability Optimum adjustment concept thanks to adjustment of the entire signal chain incl. analog adjustment P2A software for parameterization, adjustment and analysis saves time and costs in commissioning and maintenance	Transmitters
Testo 6444 (0555 6444) DN50 Compressed Air Flow Transmitter	Leakage detection, compressed air consumption meaurement Consumption cost allocation Peakload management Measuring range: 2.3 to 700 Nm³/h Pipe diameter: DN 50 (for 2" pipes) Weight: 3.8 kg Max. display value norm volume flow: 840 Nm³/h Min./max. monitoring Control of consumption-dependent maintenance strategies Automatic, exact compressed air dosage	Transmitters
Testo 6443 (0555 6443) DN40 Compressed Air Flow Transmitter	Leakage detection, compressed air consumption meaurement Consumption cost allocation Peakload management Measuring range: 1.3 to 410 Nm³/h Pipe diameter: DN 40 (for 1 1/2" pipes) Weight: 3.0 kg Max. display value norm volume flow: 492 Nm³/h Min./max. monitoring Control of consumption-dependent maintenance strategies Automatic, exact compressed air dosage	Transmitters
Testo 6442 (0555 6442) DN25 Compressed Air Flow Transmitter	Leakage detection, compressed air consumption meaurement Consumption cost allocation Peakload management Measuring range: 0.75 to 225 Nm³/h Pipe diameter: DN 25 (for 1" pipes) Weight: 1.1 kg Max. display value norm volume flow: 270 Nm³/h Min./max. monitoring Control of consumption-dependent maintenance strategies Automatic, exact compressed air dosage	Transmitters
Testo 6441 (0555 6441) DN15 Compressed Air Flow Transmitter	Leakage detection, compressed air consumption meaurement Consumption cost allocation Peakload management Measuring range: 0.25 to 75 Nm³/h Pipe diameter: DN 15 (for 1/2" pipes) Weight: 0.9 kg Max. display value norm volume flow: 90 Nm³/h Min./max. monitoring Control of consumption-dependent maintenance strategies Automatic, exact compressed air dosage	Transmitters
Testo 6383 (0555 6383) Metal Wall-mount Differential Pressure Transmitter	Measurement of differential pressure; optional: humidity and temperature Automatic zero-point adjustment guarantees high, temperature-independent accuracy and long-term stability Low measurement range up to 10 Pa ensures highest precision at lowest pressures Flat housing allows flush surface integration in the cleanroom wall Display with multi-language operating menu and optical alarm display Preparation for external humidity/ temperature probe Testo 6610 Piezoresistive sensor 0.1 Pa Resolution 0.1 percent RH Humidity 0.01° C Temperature Protection class: IP 65 Operation temperature: -5 to 50° C Storage temperature: -20 to 60° C Process temperature: -20 to 65° C Measures 161 mm length, by 78 mm width, by 396 mm height	Transmitters
Testo 6381 (0555 6381) Metal Differential Pressure Transmitter	Automatic zero-point adjustment guarantees high, temperature-independent accuracy and long-term stability Low measurement range up to 10 Pa ensures highest precision at lowest pressures Flat housing allows flush surface integration in the cleanroom wall Display with multi-language operating menu and optical alarm display Differential pressure: scalable +/-50 percent of measuring range final value; freely scalable within measuring range Measuring cycle: 1/sec Resolution: 12 bit Maximum load: 500 ohms Front plate stainless steel, housing plastic material 3-line LCD with multi-language operating menu Operation temperature: -5 to 50° C Storage temperature: -20 to 60° C Process temperature: -20 to 65° C Measures 161 mm length, by 78 mm width, by 396 mm height Preparation for external humidity/temperature probe Testo 6610 Piezoresistive sensor	Transmitters
Testo 6351 (0555 6351) Plastic Differential Pressure Transmitter	Measurement of differential pressure, flow velocity and volume flow Automatic zero-point adjustment guarantees high, temperature-independent accuracy and long-term stability Display with multi-language operating menu and optical alarm display Ethernet, relay and analog outputs allow optimum integration into individual automation systems Self-monitoring of the transmitter and early warning function guarantee high system availability 4 relay outputs, limit value monitoring Cable entry NPT 1/2" Operating temperature: -5 to 50 ° C Storage temperature: -20 to 60 ° C Process temperature: -20 to 65 ° C Measures 162 mm length by 77 mm width by 122 mm height Piezoresistive sensor Measuring cycle: 1/sec Maximum load: 500 ohms Differential pressure: mbar/min/max Protection class: IP 65	Transmitters