Measuring Instruments/
Test Equipment

Hygrometers

In our web pages, you will find hygrometers that can measure relative air humidity, or combined devices that can also measure temperature. These hygrometers measure different ranges of humidity depending on the model. Relative air humidity is an important factor in most sectors, including industrial, transport and gardening. They 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 hygrometers 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 hygrometers 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 hygrometers
  (internal sensor for temperature and humidity, memory for 32,000 values)

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

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

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

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

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

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

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

- PCE-313 A series hygrometers 
  (with memory, interface and software)

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

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

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

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

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

- hygrometers - Balances 
  (balance for measuring moisture content)

All hygrometers 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 hygrometers).

                                                        
     Recalibration standards                         Some devices use a                    ISO calibration certificate
    for hygrometers                        calibration chamber                      for hygrometers
 

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 hygrometers, 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 hygrometers have an unlimited measurement range. The 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 hygrometers 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 independent 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 hygrometers show dew point on their display.

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

 

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If you have any doubt, call our technicians on: +44 ( 0 ) 191 377 3398

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