The Testo 6781 trace humidity/dew point transmitter is used to monitor trace humidity in air, compressed air and gases. Used in all areas of industry, humidity in compressed air and gases is normally undesirable because it can cause damage to machinery or impair the quality of the end product.
The Testo 6781 humidity/dew point transmitter is an excellent option for applications that need humidity monitoring/control to meet standard ISO 8573 Class 1 and Class 2 compliance. The Testo 6781 has a measuring range from -90 to 30°C (-130 to 86°F). It features a condensation-proof sensor with sol-gel technology to guarantee the fastest response time. The automatic self-adjustment reduces operating costs and ensures high accuracy and reliability.
The Testo 6781 is compatible with Testo P2A software which allows for parameterization of unit and scale, sensor adjustment, analog output adjustment and access to adjustment history which can all be transferred to a PC for data storage and analysis. The self-monitoring transmitters guarantee high system availability.
|Units||°Ctd, °Ftd, %rF, % RH|
|Calculated variables||°CtdA, °FtdA(normed atmosph.dew point), ppmV, g/m3, g/ft3, g/kg, g/lb|
|Measuring range||-90 to 30°Ctd / -130 to 86°Ftd|
|Measurement uncertainty||-20°Ctd to -40°Ctd: ±1.5K
-40°Ctd to -60°Ctd: ±2K
-60°Ctd to -75°Ctd: ±2.5K
|Automatic self-adjustment||Cycle adjustable: 1h/6h/12h/24h|
|Current/accuracy||0 to 20 mA ±0.03 mA (4-wire)
4 to 20 mA ±0.03 mA (4-wire)
|Output type||0 to 1 V ±1.5 mV (4-wire)
0 to 5 V ±7.5 mV (4-wire)
0 to 10 V ±15 mV (4-wire)
|Load||max. 500 Ω|
|Digital||Mini-DIN for P2A software|
|voltage supply||20 to 30 VAC/DC, 300 mA current consumption, galvanically separate signal and supply line|
Please consider these optional accessories.
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