Elcometer 309 Delta T Hygrometer

Elcometer 309 Delta T Digital Hygrometer provides a quick and easy measurement of Delta T temperature and relative humidity.

The two crucial climatic factors for coatings may be measured quickly and easily with the Elcometer 309 Delta T Hygrometer:

• Delta T (TΔ): The difference between the surface temperature (Ts) and the dewpoint temperature (Td). When TΔ is less than 3ºC (5ºF) painting should not occur.
• Relative Humidity (RH): Expressed as a percentage, RH is the ratio of the amount of water vapor actually held by the air compared to the maximum amount of water vapor the air could hold at a given temperature. Typical maximum RH values specified by paint manufacturers are between 75% and 85%.

The Elcometer 309 Delta T Hygrometers include:

• Rugged design: The Elcometer 309 digital hygrometer is waterproof and dustproof, with fully sealed sensors, making it suitable for usage in harsh settings.
• High / Low Limits: Displayed on screen graphically as either (?) or (X) with flashing Red or Green LEDs to indicate pass or fail.
  • Delta T Temperature: TΔ is pre-set at >3ºC (>5ºF), the industry norm.
  • Relative Humidity: User definable upper limit can be set for RH.
• Measurement Hold / Release function: With a single button press readings are ‘frozen’ on the screen.  These can then be recorded before, simply pressing the button again to ‘unfreeze’ the screen and then take further readings as necessary.
• Backlight: Provides clearly lit information – ideal in dark or confined spaces.

Elcometer 309 Delta T Specifications

Part Number	Description	Certificate
G309—-1	Elcometer 309 Delta T Hygrometer
Operating Range	-20ºC to +80ºC (-4ºF to +176ºF)
Surface Temperature (TS)	-20ºC to +80ºC (-4ºF to +176ºF)
Relative Humidity (RH) & Accuracy1	0% to 100% RH (±3%) (Default upper limit 75%, user adjustable)
Resolution	0.1ºC (0.1ºF) / 0.1%
Power Supply	2 x AA batteries or via USB Cable
Battery Life	Greater than 40 hours (Backlight off)
Dimensions	180 x 75 x 35mm (7 x 3 x 1.4”)
Weight	300g (0.66lb)
Packing List	Elcometer 309 Delta T Hygrometer, wrist strap, 2 x AA batteries, protective carry case/pouch with belt clip, RH probe calibration certificate, and operating instructions.

Accessories

• USB Cable
• Wrist Strap
• Protective Carry Case / Pouch
• Optional Full Calibration Certificate

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