Moisture transmitter series testo 6681

testo 6681 – moisture transmitter series for sensitive environments

For monitoring and controlling sensitive environments in process engineering contexts

  • -40...180°C
  • 0...100%RH
  • Interchangeable sensors

Delivery time: 5-10 working days

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Delivery time: 5-10 working days

SKU: 0555 6681 Categories: , , , ,

testo 6681 – Moisture transmitter series for sensitive & demanding environments

The testo 6681 is positioned in the upper performance range. It is designed for the monitoring and control of sensitive environments in process engineering and for the control of compressed air systems.

The main benefits

  • Testo’s highly accurate and long-term stable moisture sensor
  • Robust precision transmitter
  • -40…180°C
  • 0…100%RH
  • Interchangeable sensors
  • Reports with early warning signs
  • Variable adjustment possibilities
  • Integrated Mollier diagram
  • Integrated relays (optional)
  • A third analog output (optional)
  • Display (optional)

This series of transmitters has interchangeable sensors, which are adapted to the application. Through the adjustment and setting software P2A you have total control over the instrument, you can scale/calibrate/adjust the output signal on all outputs including the analog output. In addition, the transmitter can be fed via USB. Adjustment or analysis can therefore be carried out without the need to run any other cables e.g. on the table or in the service workshop or areas without the possibility of power supply.

Using the optional display and the four buttons on the front, you can easily adjust, commission and analyze the instrument on site without a PC if you do not have access to one. Thanks to the new digital plug-in sensors, it is very easy to change sensors without tools. There is also no need to readjust the transmitter as the sensor is calibrated and adjusted before delivery. The Testo 6681 has an integrated Mollier chart which allows for a wide variety of selectable units.

Contact us for prices and more information

Enclosure MaterialMetal
Size122 x 162 x 77 mm
Measurement rangeHumidity: 0...100 %RH

Temperature: -40...+180°C
Protection classIP65
Working temperature of instrument housing-40 to +70 °C

Display: 0 to +50 °C
Storage temp-40...+80°C
Display resolution0.1%RH / 0.1°C
Sensor connectionDigital "plug-in" connection
Screw connectionM 16 x 1.5 (2x) with inner diameter 4-8 mm

M 20 x 1.5 (2x) with inner diameter 6-12 mm
Display2-line LCD with clear text (display is optional) and indication of relay status
Analog output:
Accuracy: Current4...20 mA ±0.03 mA (2-wire)

0...20 mA ±0.03 mA (4-wire)

4...20 mA ±0.03 mA (4-wire) for heated sensor
Accuracy: Voltage0 to1 V ±1.5 mV(4-wire)

0 to5 V ±7.5 mV (4-wire)

0 to10 V ±15 mV(4-wire)
Resolution12 bits
Max load2 thread

12 VDC: 100 Ohms

24 VDC: 500 Ohm

30 VDC: 625 Ohms



4-wire 500 Ohm
Galvanic isolationGalvanic isolation on the outputs (2-wire and 4-wire), isolation between the supply and the outputs (4-wire)
Analog output/Temp
EMC2004/108/EC
UnitsTemperature in C° / F°

Relative humidity %F / %RH

Dew point in °Ctd /°Ftd

Pressure dew point °Ctpd

Absolute humidity in g/m3

Water content in g/kg

Enthalpy in kJ/kg

Psychometer temperature in °Ctw

Partial pressure in water vapor hPa/H2O

Water content in ppm vol/%Vol

Mix dew point in H2o2/in °Ctm
Relay output4 pcs up to 256 VAC /3A NC/C/NO (optional)
Digital outputMini Din for Testo P2A software and Testo 400/650 (optional)
Power supply2-wire: 24VDC ±10%

Galvanic isolation on the outputs (2-wire and 4-wire), isolation between the supply and the outputs (4-wire)



2004/108/EC

4-wire: 20...30VAC/DC, 200mA max current consumption
Measuring mediumAir, Nitrogen, more on request
Weight1.5kg (without sensor)

Moisture probes

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