A person's sense of well-being in a room (level of comfort) depends on a series of particular external influencing factors. For example, people are extremely sensitive towards thermal radiation caused by cold walls or windows. We also respond to draughts in a room with thermal discomfort. Thermal comfort is defined by the following main influencing factors: indoor air temperature and radiation temperature, air velocity, relative humidity of the indoor air. In turn, the effect of these main influencing factors on a person's sense of comfort depends on his or her (level of) activity and clothing. The international standard ISO 7730 combines all of the parameters in the PMV/PPD measurement (Predicted Mean Vote/Predicted Percentage Dissatisfied). The PMV is an index which predicts the average climate assessment value of a large group of people. The PPD Index provides a quantitative prediction of the number of people that will be dissatisfied with a certain ambient atmosphere.

2 products or recommendations for PMV/PPD
  • testo 400 - Universal Air Flow and IAQ Instrument

    Order-Nr. 0560 0400

    The testo 400 is the universal measuring instrument for all TAB / Commissioning and IAQ professionals. Measure, analyze and document Air flow, air pressure,  IAQ and comfort level parameters using just one instrument – simply, conveniently and in compliance with the standards. High-quality measuring technology, intuitive measurement assistants, versatile documentation options and a comprehensive selection of air flow, comfort and IAQ probes make the testo 400 the perfect partner for your day-to-day work.
    • Smart, intuitive measurement programs including HVAC volume flow grid measurement as per ASHRAE 111, PMV/PPD and turbulence as per ASHRAE 55

    • High-precision, location-independent and integrated differential pressure sensor meeting the NEBB Instrument requirements for Air pressure

    • Measure all Air flow, Comfort and IAQ-related parameters – with our wide range of probes

    • Document measuring values directly on the customer's site and send them by e-mail, or further analyze them using the testo DataControl PC software

  • IAQ data logger for long-term measurements

    Order-Nr. 0577 0400

    For long-term monitoring of the indoor air quality: Use the IAQ data logger as a stand-alone measuring unit for carrying out long-term measurements with the testo 400 IAQ measuring instrument. While the stand-alone data logger is carrying out the IAQ measurement, you can use the IAQ measuring instrument for measurements elsewhere.
    • Data logger configurable via testo 400 universal IAQ instrument

    • Compatible with probes for measuring the comfort level, turbulence, radiant heat, CO2, CO, illuminance, air flow velocity, humidity and temperature

    • Stand-alone data logger for long-term measurements up to 2 weeks

    • Connect up to six fixed cable probes at the same time

2 Products found