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Engineering Calculator · 037

Dew Point and Condensation Calculator

Estimate dew point, temperature margin and water-vapour pressure from air temperature and relative humidity.

Pressure & environment
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Calculated dew point19.15°C
Air-to-dew-point margin5.85°C
Water-vapour pressure22.12hPa

Formula
γ=ln⁡ ⁣(RH100)+17.62T243.12+T\gamma=\ln\!\left(\frac{RH}{100}\right)+\frac{17.62T}{243.12+T}Td=243.12γ17.62−γT_d=\frac{243.12\gamma}{17.62-\gamma}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

Condensation becomes possible when a surface falls to or below the surrounding air’s dew point. This tool applies the WMO equation published in Vaisala AWS810 documentation and reports the temperature margin between current air temperature and calculated dew point.

Dew Point and Condensation Calculator engineering relationship diagramThe calculated dew point uses air temperature in degrees Celsius and relative humidity in percent. Actual enclosure surfaces may be colder than measured ambient air. This dedicated schematic represents dew point threshold and is not to scale.ENCLOSURE CONDENSATION · TOOL 037Air temperatureCalculated dew point
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

The calculated dew point uses air temperature in degrees Celsius and relative humidity in percent. Actual enclosure surfaces may be colder than measured ambient air.

Calculation relationship
γ=ln⁡ ⁣(RH100)+17.62T243.12+T\gamma=\ln\!\left(\frac{RH}{100}\right)+\frac{17.62T}{243.12+T}Td=243.12γ17.62−γT_d=\frac{243.12\gamma}{17.62-\gamma}

The calculated dew point uses air temperature in degrees Celsius and relative humidity in percent. Actual enclosure surfaces may be colder than measured ambient air.

Variables

TAir temperature°C

Use sequence

From measurement to review

  1. Measure representative air temperature and relative humidity near the enclosure.
  2. Calculate dew point and the current air-temperature margin.
  3. Compare dew point with the coldest expected internal and external surfaces, including startup and night cooling.

Limits

What this calculation does not confirm

  • Inputs represent the same air sample and time period.
  • The WMO equation is an atmospheric-moisture estimate, not an enclosure thermal model.
  • Thermal bridges, pressure breathing and trapped installation moisture require separate review.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceHow does the dew point and condensation calculator apply the WMO dew-point relation for temperature and relative humidity?

The tool applies the WMO dew-point relation for temperature and relative humidity. It keeps the entered values, units and assumptions visible so the result can be checked or repeated.

02Calculator guidanceWhat engineering review can the dew point and condensation calculator support?

It supports a preliminary review based on the WMO dew-point relation for temperature and relative humidity. It does not select a final cable-gland model or confirm standards compliance, ingress performance or installation approval.

03Calculator guidanceWhy must sensor location be checked before using the dew point and condensation calculator result?

Verify sensor location, coldest surface temperature, startup conditions, enclosure breathing and trapped moisture.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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