A Guide to Therma-Hygrometers

A therma-hygrometer, also known as a humidity meter, is an instrument used to measure both temperature and humidity in the air. It combines two separate sensors - a thermometer to measure temperature and a hygrometer to measure humidity - into a single instrument.

A therma-hygrometer will typically measure temperature in degrees Celsius or Fahrenheit. Humidity is calculated as a percentage of the maximum amount of moisture the air can hold at a given temperature. This measurement is relative humidity (%rh). Measuring relative humidity in various applications is vital to ensure it does not rise too high. If there is a high %rh, building materials, products with sensitivity to moisture and automation systems can be damaged. A high-quality therma-hygrometer will provide accurate readings for temperature and humidity, making it a valuable tool for many applications, such as monitoring conditions in a greenhouse, laboratory, building sites, HVAC systems or manufacturing facility.

Therma-hygrometers come in various forms, including handheld units and larger, more complex models that can be mounted on walls or integrated into HVAC systems. ETI specialises in handheld units that not only measure humidity but can record and store data over time, feature max/min dew point calculation, come with interchangeable probes, display dew point or wet bulb temperature, or provide alarms or alerts when conditions fall outside a set range.

Overall, therma-hygrometers are essential tools for anyone who needs to monitor and control temperature and humidity levels in a given environment. Thermometer shop recommends ETI therma-hygrometers to various industries, including agriculture, food production, manufacturing, and HVAC. ETI's range of therma-hygrometers are particularly suited to the pharmaceuticals industry as they often require measuring humidity as the products used can be extremely sensitive to varied humidity levels.

ETI supply a range wide range of therma-hygrometers with varying capabilities and features. Their therma-hygrometer range starts with the most simple instrument - The ETI Therma-Hygrometer and expands into the 6500, 6000, 6002, 6100 and 6102, all having their own distinct features and benefits.

Humidity -  The concentration of water vapour present in the air.

Water Vapour - Water in its gaseous state, which the human eye cannot see.

Relative humidity (%rh) - The measure of water vapour content in the air, expressed as a percentage of the amount needed to achieve saturation (condensation) at the same temperature. Saturation is 100%. The %rh will change as temperature changes; therefore, if a temperature is unstable, so will the %rbh. The relative humidity also varies with the pressure of a system.

Dew Point - The dew point is the lower temperature at which air cools for saturation (condensation) to occur. The dew point of an application depends on the concentration of the water vapour (relative humidity %rh) present. 

Wet Bulb Temperature -  Another term for dew point.