If climatic conditions; such as surface temperature, air temperature, relative humidity, wet bulb temperature, dry bulb temperatre, dewpoint temperature, and the Delta T; are wrong at the time of applying a coating, this could cause coating failure. That’s why it’s vital to monitor a range of climatic parameters before and during the coating application process, to ensure your coating can have a successful service life. So what climatic parameters do we measure, why do we measure them, and how? CONTENTS 0:00 - Introduction 0:50 - What climatic conditions do we measure? 1:48 - Why do we measure climatic conditions? 3:58 - How do we measure climatic conditions? 4:20 - How to use a Whirling Hygrometer / Sling Psychrometer 8:29 - Using a surface temperature thermometer 10:03 - Elcometer 319 Dewpoint Meter The key climatic parameters include: • Surface temperature (Ts), the temperature of the surface to be painted; • Air temperature (Ta), the temperature of the air surrounding the surface to be painted; • % Relative Humidity (RH), the amount of water vapour present in the air compared to the maximum possible, expressed as a percentage; • Wet bulb temperature (Twb), the air temperature as read by a thermometer that’s covered in water-soaked fabric over which air is passed; • Dry bulb temperature (Tdb), the temperature that is usually thought of as air temperature; • Dewpoint (Td), the temperature at which moisture condenses on a surface, calculated from the air temperature and % Relative Humidity; • And the Delta T (TΔ), the difference between the surface temperature (Ts) and the dewpoint temperature (Td). While it’s important to monitor all of these parameters, special attention should be paid to surface temperature and relative humidity, as most paint data sheets will specify acceptable ranges of these parameters in which the paint can be applied. However, by far the most important parameter of all is the Delta T, as it tells you the difference between the surface temperature and the dewpoint temperature. The smaller the difference, the more likely that moisture (or dew) will have condensed on the surface. It is generally accepted within the industry that the Delta T should be at least 3°C (5°F) or higher for the coating to be applied. How do you actually measure and calculate the key climatic parameters? There are two main methods you can follow. The traditional method requires multiple pieces of equipment to complete. The first piece required is the whirling hygrometer, also known as a sling psychrometer, and it is used to measure the wet bulb and dry bulb temperatures. These temperatures are then used to work out the dewpoint and relative humidity. Elcometer provides two types of hygrometer, but they work in pretty much the same way. Hygrometers consist of two liquid filled thermometers positioned side-by-side in a rotating body. One thermometer is covered with a fabric “sock” or “wick” connected to a reservoir (this measures your wet bulb temperature), while the other is uncovered (this measures your dry bulb temperature). Once you have your results, typically conversion tables are then used to determine the relative humidity and dewpoint temperature, like the ones supplied with the Elcometer 116 Hygrometers. Alternatively, the Elcometer 114 Dewpoint Calculator provides a quick and easy way to determine these values, and we show you how it works in our Elcometer 114 video: https://youtu.be/HLbuapAnoqA However you are still missing the all-important Delta T measurement, and to calculate this, you still need a surface temperature measurement – something a hygrometer can’t provide, meaning you’ll need a separate surface thermometer. Once you have your surface temperature, subtract your dewpoint temperature from it, and you have the Delta T. However there is a quicker and simpler method, without sacrificing on accuracy. The Elcometer 319 Dewpoint Meter is a digital gauge that can monitor and record all of the key climatic parameters simultaneously, telling you if conditions are suitable for painting. What’s more it can continuously monitor and log the conditions as you paint, and instantly alarm if one of the parameters falls outside of the specified range. For more information on Elcometer’s entire range of climate monitoring equipment, please contact Elcometer at sales@elcometer.com or visit our website: https://www.elcometer.com/en/coating-inspection/rh-dewpoint-temperature.html ----- Click here to download the video script in English: https://www.elcometer.com/pub/media/PDF/Video_Scripts/Introduction_Climatic_Testing_1.pdf ----- STANDARDS: Elcometer 116 Whirling & Sling Hygrometers ASTM E 337-B, BS 2842, ISO 8502-4 Elcometer 319 Dewpoint Meter BS 7079-B4, IMO MSC.215(82), IMO MSC.244(83), ISO 8502-4, US Navy NSI 009-32, US Navy PPI 63101-000

The Elcometer 319 Dewpoint Meter can monitor and record all of the key climatic parameters simultaneously, telling you if conditions are suitable for painting. 0:00 - Why we measure climatic conditions before painting 1:50 - Introducing the Elcometer 319 3:34 - How to use the Elcometer 319 4:58 - Interval Logging with Elcometer 319T 5:46 - ElcoMaster and the Elcometer 319 If a coating is applied in the wrong climatic conditions this can affect its performance, resulting in flaws, problems with coating adhesion, and ultimately coating failure. This is why key climatic parameters should be monitored before and during application, to ensure conditions are suitable for painting. For a long time this was and still is done using a whirling hygrometer, also known as a sling psychrometer, which measures the wet bulb and dry bulb temperature of the air, in order to then calculate the relative humidity and dewpoint temperature. Typically, you’d then use a separate thermometer to measure the surface temperature, in order to calculate the Delta T. But with multiple pieces of equipment, and the need to use conversion tables and calculations to obtain your results, surely there’s a more effective way to monitor climatic conditions than this. There is: the Elcometer 319 Dewpoint Meter. Whether using as a handheld dewpoint meter, or as a remote data logging monitor, the Elcometer 319 can monitor and record all of the key climatic parameters simultaneously, telling you if conditions are suitable for painting. The Elcometer 319 is equipped with an air temperature and humidity probe, a surface temperature probe, and a K-Type connector, which allows you to connect additional external probes such as magnetic surface temperature probes or liquid temperature probes. That means this single gauge can measure and record: • Surface temperature (Ts), the temperature of the surface to be painted; • Air temperature (Ta), the temperature of the air surrounding the surface to be painted; • % Relative Humidity (RH), the amount of humidity present in the air compared to the maximum possible, expressed as a percentage; • Dewpoint (Td), the temperature at which moisture condenses on a surface, calculated from the air temperature and % Relative Humidity; • Delta T (TΔ), the difference between the surface temperature (Ts) and the dewpoint temperature (Td); • Wet bulb temperature (Twb), calculated from surface temperature and relative humidity; • And Dry bulb temperature (Tdb), equal to air temperature. The gauge is dust and waterproof with fully sealed sensors, equivalent to IP66, and can safely be used in a wide range of climates. And unlike the whirling hygrometers, which you have to spin around to obtain measurements, the Elcometer 319 can be held against the substrate, or even attached using the integrated magnets, allowing you to measure the climatic conditions of the localised area around the substrate being painted, so you can obtain more relevant readings. While it’s important to monitor the conditions before you start painting, it’s equally important to continue to monitoring whilst the job is ongoing, as conditions change throughout the day. That’s why the Elcometer 319 Model T can continuously monitor and record the conditions as you paint using its Interval Logging feature, taking a reading automatically at rate of your choice between 1 second and 24 hours. If you wish to continuously log the surface temperature, we recommend using an external surface temperature probe with this feature, so it remains securely attached to the surface without needing to be held. What’s more you can set high and low limits on any and all parameters, so the Elcometer 319 instantly alarms whenever a parameter exceeds specification. And, once the inspection is done, every reading of every climatic parameter can be transferred via USB or Bluetooth to ElcoMaster®, Elcometer’s free data management software for Android and Apple mobile devices, or PC, allowing you to further analyse the data and create professional inspection reports instantly. Thanks to ElcoMaster® it’s even possible to remotely monitor the Elcometer 319 live, while it’s logging the conditions, creating a mobile climate station. And by setting limits within ElcoMaster®, the moment one of the parameters falls out of specification, as long as you’re connected or within Bluetooth range, you’ll be able to see instantly. For more information on the Elcometer 319 Dewpoint Meter, please contact Elcometer at sales@elcometer.com or visit our website: https://www.elcometer.com/en/coating-inspection/protective-coatings-inspection-equipment/rh-dewpoint-temperature/elcometer-319-dewpoint-meter.html ----- Click here to download the video script in English: https://www.elcometer.com/media/PDF/Video_Scripts/Climatic_Conditions_Elcometer_319.pdf ----- STANDARDS: BS 7079-B4, IMO MSC.215(82), IMO MSC.244(83), ISO 8502-4, US Navy NSI 009-32, US Navy PPI 63101-000