Calculates volumetric flow and flow velocity parameters, with optional humidity and temperature measurement, selectable measuring ranges from 10 Pa to 1000 hPa, selectable analog signal outputs, and optional display (depending on configuration).

• Automatic zero point adjustment guarantees high accuracy independent of temperature and long-term stability
• The low measuring range from 10 Pa ensures the highest accuracy for low pressure measurement
• Transmitter for measuring differential pressure, flow velocity, and volumetric flow, as well as, optionally, humidity and temperature
• Signal alarm function configuration: possibility to set signal delay and select the alarm acknowledgment type

testo 6381 differential pressure transmitter with flow velocity calculation function and optionally with temperature/humidity measurement function, accuracy ±0.5% of measuring range, automatic “zero point” adjustment, selectable measuring ranges from 10 Pa to 1000 hPa, selectable analog signal outputs, external digital interface for adjustment and parameterization, optional display, data output in all pressure, flow, and humidity units.

testo 6383 for cleanroom applications, with optional humidity and temperature measurement, selectable measuring ranges from 10 Pa to 10 hPa, selectable analog signal outputs, and optional display (depending on configuration)

• The flat housing allows for flush mounting on the cleanroom wall
• The low measuring range from 10 Pa ensures the highest accuracy for low pressure measurement
• Transmitter for measuring differential pressure, as well as, optionally, humidity and temperature
• Automatic zero point adjustment guarantees high accuracy independent of temperature and long-term stability

testo 6383 differential pressure transmitter for cleanroom applications (panel mounting), optionally with temperature/humidity measurement function, accuracy ±0.3% of measuring range, automatic “zero point” adjustment, selectable measuring ranges from 10 Pa to 10 hPa, selectable analog signal outputs, external digital interface for adjustment and parameterization, display, data output in all pressure and humidity units.

testo 6681 with the possibility of selecting analog signal outputs, optional two-line display), optional Ethernet or Profibus module, data output in all humidity units, optional relay, optional third analog output

• High-precision Testo humidity sensor with long-term stability for application in high-humidity processes (option)
• The Ethernet module, relay, and analog outputs allow for optimal integration of the transmitter into individual automated systems
• High-quality digital probes and the intelligent calibration concept
• Self-monitoring and an early warning function ensure high system availability

testo 6681 Industrial temperature/humidity transmitter, accuracy up to ±1.0 % RH (depends on the probe type), selectable analog signal outputs, optional display, optional Ethernet module or Profibus DP module, data output in all humidity units, optional relays, external digital interface for adjustment and parameterization, 2 analog outputs, optional 3rd analog output

Compressed air counter with various signal outputs: analog output, pulse output, 2 switching outputs
Totalizing function (totalizer) for calculating overall consumption
High accuracy: thanks to a defined nominal diameter (DN15), you can adjust the standard volumetric flow rate

testo 6741 dew point transmitter, measuring range down to -45°Ctd, **without display**, connection type G1/2, 4…20 mA analog signal output, optional signal module connector with two switching outputs

Product Description
The testo 6741 instrument was specifically designed for measuring residual moisture in compressed or dry air (adsorption dryers). This type of measurement is successfully carried out thanks to the Testo humidity sensor and its proven and well-established long-term stability. The sensor’s effectiveness has been repeatedly confirmed through tests in international calibration laboratories (PTB, NIST, etc.), where the error limit of ± 1% RH was not exceeded for 5 years without sensor readjustment. Optimal accuracy is achieved due to special tuning in the residual moisture range.

• Compressed air counter with various signal outputs: analog output, pulse output, 2 switching outputs
• Totalizing function (totalizer) for calculating overall consumption
• High accuracy: thanks to a defined nominal diameter DN50, you can adjust the standard volumetric flow rate

testo 6744 dew point transmitter, measuring range down to -45°Ctd, with display, connection type NPT1/2, analog signal output 4…20 mA, optional signal module connector with two switching outputs.