Product novelty 13. March 2025

The newly revised DAkkS-DKD-R 5-7 guideline serves to define minimum requirements for the calibration procedure and the determination of measurement uncertainty when calibrating climatic chambers. With the ALMEMO® data logger system, AHLBORN offers the optimum measurement technology for calibrations. With ALMEMO® 710, a digital psychrometer and 8 temperature sensors, all relevant measured variables are recorded in the climate chamber. The climate chamber can be conveniently calibrated on site, as the relative humidity of the 9 points is calculated in the ALMEMO® measuring device itself. The latter is based on the formulas according to Dr. Sonntag, taking into account the enhancement factor according to W. Bögel (correction factor Fw(t,p) for real mixed gas systems). This significantly increases the measuring range and the accuracy of the humidity values. The influence of radiation on the measurement of the air temperature is determined using 2 temperature sensors. These have different emissivities due to their different sensor surfaces. With an ALMEMO® double sensor, the 2 temperatures can be measured simultaneously (additionally) with the 8 temperatures of the corner points. A digital Pt100 psychrometer is placed in the center of the useful volume. The relative humidity and the dew point are determined from the measured values of dry temperature and wet bulb temperature together with the air pressure. All measured values and calculated values can be viewed directly on the clear touch display of the ALMEMO 710. At the same time, the ALMEMO® 710 works as a data logger, meaning that the series of measurements are stored in the device. The WinControl software is used to document and display the measured values - online during the measurement or offline after the measurement. Various evaluation and functions can also be selected. As an option, there is the assistant for calibrating climate chambers with automatic, convenient evaluation and report generation.