Measuring Instruments/
Test Equipment

Relative Humidity Meters

In our web pages, you will find relative humidity meters that can measure relative air humidity, or combined devices that can also measure temperature. These relative humidity meters measure different ranges of humidity depending on the model. Relative air humidity is an important factor in most sectors, including industrial, transport and gardening. Relative humidity meters are versatile in that they can take measurements, store them to memory and transfer data to a computer for further detailed analysis. There is also the calibration standards for the device which makes it easy to ensure that measurements are their most accurate. Many of our relative humidity meters come with an ISO calibration certificate and some models are legally validated. They are very useful in evaluating damage in a warehouse. If you don't find the relative humidity meters you are looking for, please contact us and we will help you find the best solution to suit your needs by calling our offices on: +44 ( 0 ) 191 377 3398 and our technical staff will advise you regarding our products.

Technical specifications for our moisture testers can be found at the following links:

- PCE-HT71 series relative humidity meters
  (internal sensor for temperature and humidity, memory for 32,000 values)

- PCE-MSR145 series relative humidity meters
  (internal sensor for humidity, pressure, temperature, acceleration and position)

- PCE-222 series relative humidity meters 
  (4 in 1 device with internal sensors for humidity, temperature, sound and lux)

- PCE-EM882 series relative humidity meters 
  (4 in 1 with external sensors for humidity, temperature, sound and lux)

- PCE-555 series relative humidity meters 
  (for measuring relative humidity, temperature and dew point)

- PCE-310 series relative humidity meters
  (measures, temperature, humidity and dew point)

- PCE-HGP series relative humidity meters
  (combined testers to measure relative and absolute humidity and temperature)

- PCE-320 series relative humidity meters
  (measures temperature, humidity and dewpoint, has connections for temperature sensors)

- PCE-313 A series relative humidity meters 
  (with memory, interface and software)

- PCE-3000 series relative humidity meters 
  (measures relative humidity, temperature, dew point, with memory)

- PCE-G1 series relative humidity meters 
  (humidity and temperature, with a large display visible from up to 50m distance)

- PCE-WM1 series relative humidity meters 
  (hygroscopic moisture in [g/m³] and [%], temperature, dew point ,external sensors)

- PCE-HT110 series relative humidity meters 
  (external display, data logger, sensor for temperature and humidity)

- PCE-THB 38 series relative humidity meters  
  (Thermometer, hygrometer and barometer in one handheld device)

- relative humidity meters - Balances 
  (balance for measuring moisture content)

All relative humidity meters come calibrated, but as their sensor's accuracy deteriorates with use, they should be recalibrated on a regular basis. A calibration can be done by the user of the device by using that optional calibration standards or the device can be sent to us and we will perform a recalibration that will meet ISO standards. (Calibration / recalibration of relative humidity meters).

                                                        
     Recalibration standards                         Some devices use a                    ISO calibration certificate
    for relative humidity meters                        calibration chamber                      for relative humidity meters
 

Information about relative humidity: Relative humidity (r.h.) shows the relationship between absolute humidity (the amount really there) and the saturation state of water vapors. Relative air humidity is measured using relative humidity meters, that show on their displays from 0% (absolutely dry air) up to 100% (air that is completely saturated, such as fog, clouds or steam bath). Some models of relative humidity meters ave an unlimited measurement range. Teh physical area is between 40 and 65% r.h. Given that hot air possesses the ability to absorb more water vapour than cold air, people feel that in winter, air is too dry and in summer it is too humid. If air heats up it increases the amount of water vapour to that of saturation. The consequence is that the % of relative humidity decreases while the real quantity of water remains constant. Something similar occurs when air is cooled, decreasing the quantity of water vapour. This increases the percentage value of relative humidity. Condensation forms when there is an excess of water in saturated conditions. Some of our relative humidity meters offer the ability to not only measure relative humidity and temperature, but can also calculate dew point and dew point temperature. Dew point temperature is defined as the temperature at which the actual vapour content of air is the maximum (100% relative humidity). Dew point temperature is independant of the actual temperature. One possibility of dew point temperature is freezing metal until its surface forms condensation. The temperature of the metal will then be the dew point temperature. As we have mentioned, many of our relative humidity meters show dew point on their display.

If you wish to view or print a selection of relative humidity meters from our catalogue, click the PDF symbol.

 

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