FISCHER Newsletter
Maintenance-free digital differential pressure switches / transmitters
without sealing liquid for gaseous media
With view to air-conditioning systems (HVAC systems) in health service rooms and facilities, DIN 1946-4:2008-12 requires, with regard to monitoring equipment, inter alia, that "differential pressure gauges with local display, without sealing liquid and pressure sensor" are to be used. The implementation of inclined tube manometers or manometers with capsule pressure gauge is therefore not allowed. This applies to "filters of the 1st and 2nd filter stage". FISCHER offers compact and intelligent measuring instruments fulfilling the general requirements in conformity with the respective standard. ..."the entering of room class I for cleaning and maintenance" for example is therefore not required. Furthermore and owing to the design of the instrument "the admissible contamination of the supply air due to inorganic or organic matter... is reliably prevented". Thus, the instruments are generally interesting for use in HVAC systems.
They are equipped with a display, analog output signals and switch contacts as an option. Combining these three functions in one unit means a considerable reduction of installation work. Thanks to easy menu navigation, it is also possible to record fan curves for controlled ventilation systems in view of the steadily growing importance of the issue of energy optimization of volume flow. In addition, the LC color change display serves to visually indicate limit value exceedance or undercut. The device family comprises transmitter with one or two differential pressure measuring cells for ventilation tasks DE44, DE45. Owing to a special measuring cell, minimal pressures in the Pa range can be illustrated for clean room and safety laboratory applications DE46. For longer distances from the measuring point to the display unit or as a parallel display, there are also instruments without measuring cell with analog input signal available EA14F. For more information please see our flyer.
DE43 - Digital 2-channel transmitter with modbus
The differential pressure transmitter DE43 is a new measuring instrument, which was specifically designed for ventilation monitoring tasks in larger plant complexes. It is characterized by its two measuring cells which, for example, can be used for both volume flow control and filter monitoring at the same time. It is significant that the digital output signals use a RS 485 interface with Modbus RTU-protocol. This enables linking of extensive measuring points via a linear network structure requiring a correspondingly reduced installation work. Both the bus address as well as the communication parameters of the Modbus interface can be adjusted externally on the unit. The unit comes with up to 4 potential-free contact inputs as an option. The measuring range is between max.16 mbar respectively ± 16 mbar per channel. For more information please click here.
Training at FISCHER
As a technology company FISCHER depends on excellently trained personnel. Therefore, we continue to put great emphasis on the training of qualified employees. We currently have 11 trainees as electronics engineers for equipment and systems, cutting machine operators, industrial engineers and industrial managers. Another five trainees will start their activities in 2014. As part of the training, FISCHER attaches great importance to put knowledge into practice at an early stage, in order to promote the self-reliance of our young colleagues. Of course, our experienced employees support them and provide useful information.