645 Two Channel Hygrometer Indicator / Logger - CONFIGURATION OPTIONS 
by Edgetech Instruments

EdgeTech - Probe Connection Cable  (Model:  -0143)
Connects all of the Model 645's RH Probes to the Model 645 Instrument.  Included as standard equipment with the Model 645.

EdgeTech - 9740 Standard Air Probe RH/Temperature  (Model:  -AAP)
Standard ambient air probe up to +70°C, RH (2%) accuracy, probe Ø 12 mm, 0 to +100 %RH, -4 to 158°F / -20 to +70°C (2)


EdgeTech - 9741 High Accuracy Air Probe RH/Temperature  (Model:  -1%)
High accuracy ambient air probe up to +70°C, RH (1%) accuracy, probe Ø 21 mm, 0 to +100 %RH, -4 to 158°F / -20 to +70°C (2)
  EdgeTech - 9840 Precise Compressed Air Pressure Dew Point Probe  (Model:  -PHDP)

Precise compressed air pressure dew point HPD probe, 300 mm length, 0 to +100%RH, -76 to 122°F / -60 to +50 °C tpd (2)

The pressure dew point is an important criterion for ensuring that compressed air systems work perfectly. Use the precision pressure dew point probe with measuring chamber (combined with the 645 measuring instrument) to determine the pressure dew point quickly and accurately. Connection to the compressed air system is via a standard plug-in male nipple compressor connection or via a test connection screw fitting (for measurements on vehicles). The probe can also be used for indoor air humidity and temperature measurement without a measuring chamber.

EdgeTech - 9841 Precise Pressure Dew Point Probe  (Model:  -PHDP)

Pressure dew point probe for measurements in compressed air systems, probe length 300 mm, -22 to 122°F / -30 to +50°C tpd, 0 to +100 %RH, fixed cable.

TPD (Pressure Dew Point) is the temperature at which compressed air reaches the saturation state (100% RH). This value is an important criteria for the perfect running of the compressed air plant. This probe is connected to a compressed air system via a standard plug-in connector or via a screw-on adapter for measurements at test points. The sensor is positioned in the flow of compressed air being measured, for the duration of the measurement. The probes can be used, without a measuring chamber. The large display enables the display of the relative humidity or the dew point with the temperature.