Hygrometers are a weather instrument that measure water vapour in the air otherwise known as humidity levels. Hygrometers are widely useful for aiding in seed germination, monitoring and maintaining living conditions and protecting materials including wood and leather.
Hygrometers are used in a variety of places for many different reasons, these are,
Meteorologists use hygrometers to help predict weather changes, relative humidity levels and precipitation patterns. That show up on our weather apps daily.
Hygrometers are essential to greenhouse, land and allotment management. Monitoring humidity levels helps aid in optimum seed germination and overall crop health and yield. During seed germination humidity can be helpful especially during initial germination, however high levels of humidity when seedlings begin to grow is not optimal. This is because seeds will not be able to perform a process called ‘transpiration’ properly, a process of releasing oxygen through their stomata’s (tiny pores on the leaf). If this cannot happen the roots will suffocate and eventually die. To help keep humidity levels low, a small fan on medium or low has been proven effective at maintaining optimum humidity levels during seed germination.
Museums use hygrometers to monitor moisture levels to protect valuable items such as artefacts and artwork. Items that area typically featured in museums are rare and usually old, therefore they can be or become fragile, requiring proper maintenance and care. Monitoring various humidity levels in museums is vital for the attraction’s success. As various areas will require different levels of optimum humidity, and the way to monitor these levels is the usage of hygrometers.
Hygrometers are also useful to monitor humidity levels in your home, displaying to you how much moisture there is inside your home, understanding humidity can help reduce condensation and mould in your home whilst also protecting your health and especially young children and babies to ensure sufficient and safe air quality. Indoor humidity should sit between 40-60% relative humidity. If humidity levels drop lower than this, airborne viruses can remain infectious five times longer.
There are different types of hygrometers available, at ClimeMET we provide a wet and dry bulb hygrometer and a dial hygrometer.
The Masons wet and dry hygrometer consists of two thermometers, one wet with a wick attached over the bulb of the thermometer (like a sock) and one dry. Humidity is measured by the increase in the difference between the wet bulb and the dry bulb. Using the Hygrometric conversation table that comes with your hygrometer, you can determine % relative humidity. You do this by:
• Screw your hygrometer onto either a wall or fence post, through the two mounting hooks, one on the top and one on the bottom.
• Ensure you place your Hygrometer at least 1.5 metres above the ground for most accurate recordings. (Avoid areas of extreme heat or cold)
• Open the protective cover at the bottom of the Hygrometer and remove the water tank.
• Fill the tank with filtered or clean rain water and place back in the Hygrometer.
• Attach the wick to the base of the wet thermometer. (like a sock)
GENTLY feed the other end of the wick through the hole into the water tank.
• Place the Hygrometer in your desired location, and wait 1 hour before taking your first reading.
• Readings require your Hygrometric Conversion Table, which comes with your Hygrometer. This table determines the percentage relative humidity calculated from the dry bulb temperature and the wet bulb depression.
• Record the temperature shown of both the wet and dry bulb.
• Subtract the wet temperature from the dry temperature, giving the depression of the wet bulb.
• Using the dry temperature and the wet bulb depression, find your relative humidity reading where the two values meet on your conversions table.
• Weatherproof plastic design, means that this product is suitable for outdoor use.
• Low maintenance.
• Ensure water tank is refilled with clean water.
Our Hygrometer Dial measures differently, and is widely used both indoors and outdoors.
Our aneroid hygrometer dial displays a scale with the measurement range of 0-100% relative humidity. The outer scale displayed on the dial measures %RH to the nearest 10% and the inner scale measures the nearest 5%RH.
A spiralled metal spring mechanism expands and contracts depending on %RH. This spiral expands during periods of high humidity and contracts during periods of low humidity. The needle pointer at the front of the dial is attached to this mechanism and moves as the spiral spring expands and contracts, displaying the %RH on the dial face.
• Position your hygrometer in an area where it remains undisturbed, (avoiding areas of direct sunlight and extreme hot and cold conditions)
• Hang your Hygrometer in your desired location, using the keyhole fitting at the back.
• Leave your Hygrometer untouched for 24 hours so the instrument can adjust to the relative humidity of its surroundings.
• Use the outer scale to read current air humidity to the nearest 10% RH
• Use the inner scale to read the current air humidity to the nearest 5% RH
• Two measurements for increased accuracy of recording.
• The dial is set in a weatherproof casing.
• Personalisation is available, however, dial engravement renders the product suitable for indoor use only.
• Once adjusted to surrounding humidity levels no further adjustments are needed for this product.
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