The UMD 98 is a high-performance front panel meter* and replaces all analogue measuring devices. It measures 3/4-phase current and voltage in 4-quadrant operation in class 0.2 and thus the work in class 0.5s as well as all usual mains quantities, e.g. harmonics up to the 50th harmonic. The unit is connected via current transformers with N/5 A and N/1 A. It maps the mains quality according to EN 50160, EN 61000-2-2, EN 61000-2-4, EN 61000-2-12. It has a brilliant large colour graphic display. The UMD 98 is conveniently operated via 5 function keys. It has two analogue inputs for RCM measurement. It can be used in 230/400 V TN-S networks. It has a large 512 MB memory and an integrated web server. The unit can be accessed via the Ethernet interface (with 5 ports) and the mini USB port on the front. This means that Internet protocols can also be read in and PLC and building management systems can be easily connected. Digital inputs/outputs and a serial RS485 interface are also integrated. For network analysis, the measuring device can be extended with the firmware modules PQ S and GO. The ENVIS software is used to parameterise or visualise the unit. The CPU operates at 25.6 kHz.
* Also suitable for top-hat rail mounting with adapter.
The unit is used for power quality measurement and consumption measurement in LV and LV sub-distribution boards. With the RCM inputs, residual current measurements can be realised. Particularly suitable for building automation, data centres and hospitals.