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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Hygrometer  Delta-T Material Testing

Hygrometer Delta-T

Product Code:309

Need more Info? (514) 354-2511 - 1-800-463-4363

Before painting, the coater must meet the coatings’ parameters. These are clearly specified on the paint manufacturer’s product data sheet. Relative Humidity (RH) and Delta T (TΔ) are the two climatic values which are specified on data sheets.

Conform to ISO 8502-4, BS 7079-B4The Elcometer 309 Delta T Hygrometer provides a simple and fast measurement of these two critical characteristics. 

  • 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): This is the amount of water vapour taken up by air. Expressed as a percentage, RH is dependent on the air temperature. Typical maximum RH values specified by paint manufacturers are between 75% and 85%.

Rugged design: Suitable for use in extreme environments the Elcometer 309 digital hygrometer is dustproof and waterproof with fully sealed sensors.

High / Low Limits: Displayed on screen graphically as either (?) or (X) with flashing Red or Green LED’s 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.

Technical Specification
Part Number Description
G309----1 Elcometer 309 Delta T Hygrometer
Temperature Range (Air & Surface) -20 to +80ºC (-4 to +176ºF)
Relative Humidity (RH) Range 0 to 100%RH (Default upper limit 75%, user adjustable)
Resolution 0.1ºC / 0.1%
Power Supply 2 x AA 1.5V 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 (10.6oz)
Certificate available Certificate of Calibration: issued for Fixed Calibration equipment and shows readings and traceability
Packing List Elcometer 309 Delta T Hygrometer, wrist strap, 2 x AA batteries, protective pouch with belt clip, RH probe calibration certificate and operating instructions
Can be used in accordance with: BS 7079-B4, ISO 8502-4

Standards in grey have been superseded but are still recognised in some industries.


Part Number Description
T99921192 Protective Carry Case / Pouch
T99921325 USB Cable
T99916063 Wrist Strap
TCAL-309F Optional Full Calibration Certificate

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