Description
The Testo 6740 trace humidity sensor monitors moisture levels in air and compressed gasses. The Testo 6740 two-wire unit provides a scalable 4-20mA output signal and can be ordered with or without a local display. Calibrated to ±1% relative humidity and long-term sensor stability makes the 6740 ideal for monitoring compressed air dryers and preventing system damage from condensing water vapor.
The Testo 6740 trace humidity sensor can be configured for a variety of applications. An optional connecting plug can be added to the Testo 6740 to provide 2 limit signal alarms with LED status outputs to ensure your process is within tolerance. The sensor can be installed directly in-line or combined with measuring chamber and cooling coils to suit specific application.
The Testo 6740 housing rotates 350° and can be ordered with a ½” NPT or G1/2 process connection for ease of installation. The Testo 6740 is a simple, flexible, and cost effective sensor for trace humidity monitoring.
Air Bleed Off at 100 psig Approximately 1 SCHF (28 sl/h)
Output Loop current 4 to 20 mA; 16 :A resolution
Flow Block 316 stainless steel with 1/2 in NPT-M or G 1/2 thread; (DIN ISO 228) and gasket seal
Wrench Width for Flow Block 1-5/8 in (42 mm)
Electronics Microcontroller operated
Hardware Selectable Units Dew point temperature in °F or °C
Supply Power 24 VDC nominal, tolerance 12 to 30 VDC
Optional Display Four-digit numeric display with bar graph and matrix position indication. Four user interface keys for unit selections, output adjustments and ranging.
Protection Type 4X/IP67
Features
Pressure Dew Point Temperature: -60 to 30°Ctpd
Temperature Range: 0 to 50°C
Atmospheric Dew Point: -80 to -15°Ctd (at 30 bar rel.); -70 to +10°Ctd (at 3 bar rel.); -60 to +30°Ctd (at 0 bar rel.)
Pressure Resistance: Up to 50 bar absolute
Analog Output Signal: 4-20 mA (2-wire)
Scaling: Freely scalable via display/buttons
Output Variables: °Ctpd, °Ftpd, °CtA (atm. dew point), °FtA, %RH, ppmv, mg/m3, °C, °F
Resolution: 12 bit
Accuracy: ±40µA
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