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| | | | | | | | | | | | | | | | | | | | | | | | | | | | 32 | | | | | | | | | | deasurei | | | | | | | | | | Reference humidity probe The precision humidity probe fulfils measurement tasks with the highest accuracy requirements, such as the calibration of climate cabinets or humidity probes. For the Testo humidity sensor, which has now been used for over 10 years, and continually improved, the focus from the beginning was on the two accuracy parameters measurement inaccuracy and long-term stability. For the highly accurate humidity probe, only humidity sensors are used which have been tested several times. Each probe is put through an extensive adjustment and test procedure. This guarantees that the measurement tolerance on site of ± 1%RH in the range +10 to +90 %RH is maintained (referring to a temperature range of +15 °C to +30 °C). The accuracy and the high long-term stability were proven in an inter-laboratory test in which several humidity sensors were passed through a number of international calibration laboratories (PTB, NIST etc.), and the limit of 1 %RH was not exceeded without readjustment. Inter-laboratory test Three precision probes were tested in an extensive inter-laboratory test | | | | | | | | | | | | | | | | | | | Country | Institute | Arrival | Departure | | | | ® Germany | PTB | 04/96 | 08/96 | | | | © France | CETIAT | 10/96 | 10/96 | | | | © USA | NIST | 12/96 | 05/97 | | | | © Italy | IMGC | 07/97 | 10/97 | | | | © Great Britain | NPL | 09/98 | 09/98 | | | | © Spain | INTA | 10/98 | 10/98 | | | | © Japan | JQA | 03/99 | 04/00 | | | | © Korea | KRISS | 05/00 | 09/00 | | | | © ChineaGermany | NRCCRM | 10/00 | 12/00 | | | | ® | PTB | 03/01 | 08/01 | | | | | | | | | | | | | | | | | | | The precision set for air humidity measurement | | | | | | | | | | | | | | | | | testo 650, reference humidity meas. instr., readings memory included (up to 500,000 readings), battery, Li cell and calibration protocol | 0563 6501 | | | | Attachable printer (securely attached) including 1 roll of thermal paper and batteries | 0554 0570 | | | | Cable, 1.5 m long, connects probe with plug-in head to meas. instrument | 0430 0143 | | | | Highly accurate reference humidity/temp. probe incl. cal. cert. | 0636 9741 | | | | SoftCase (protects instrument from impact) with carrier strap, magnetic holder and probe holder | 0516 0401 | | | | SoftCase for attachable printer (protects printer from dirt/impact) | 0516 0411 | | | | System case (plastic) for measuring instrument, probes and accessories | 0516 0400 | | | | | | | | | | | | | | | | | Measurements in a climate cabinet with the highly accurate reference humidity/temperature probe. Advantage: exact monitoring of air humidity fluctuations with an accuracy of 1 %RH | | | | | | | | | | | | | | 'E I | | | | | | We recommend: | | | | | | | | | | DKD calibration certificate/humidity, cal. points freely selectable 0520 0216 from 5 to 95%RH at +25°C or -20°C to +85°C | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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