Pflitsch cable glands with unique sealing principle and electromagnetic compatibility
25 July 2012
The main focus of cable glands is on edge protection, reliable sealing and strain relief of conducted cables, to which Pflitsch has given top priority. For international applications, Pflitsch products have, amongst others, VDE, UL, CSA and Gost approval, as well as European EMV and ATEX certification.
Blueglobe (Fig. 1) and both UNI Dicht series (Fig. 2+3) are made of metal and high-grade plastic with a large-surface, spherical sealing. The sealing insert nestles axially and radially up against the cable, ensuring "soft pinching" and preventing damage to the cable. Irreparable constrictions are therefore prevented, a longer service life ensured and maximum safety guaranteed, which has been verified in a number of vibration tests. These cable glands are rated IP 68 and IP 69k.
With MatchClamp (Fig. 4), Pflitsch has a non-detachable cable entry in the range for the first time, which pinches cables gently and with which cables can be safely and reliably fed into, for example, plugs or housings. These water and gas-proof units are rated IP 68 and up to 10-times strain relief.
Pflitsch engineer Günther Quednau says electromagnetic compatibility (EMC) will become an ever more important issue in future. “The increasing use of electronic devices (PC, media centres, microwave ovens) and the proliferation of wireless equipment (mobile phones, WLAN) have real significance for those wishing to achieve interference-free communication.”
Pflitsch has been involved in EMC testing and standards committees since 1985, and now has a range of cable glands specifically designed with this in mind, including Blueglobe CLEAN, that are primarily used in the food production and chemical industries, and increasingly in the field of maritime transport.
“We can offer our customers EMC solutions tailored to meet their individual requirements,” says Quednau.
The company is now the leading supplier of cable glands for EMC products and worthy of special mention here is the Blueglobe TRI. In this product solution, the seal and the EMC screening are separated from one another. This achieves the highest damping values: Generally around 80 dB to 100 MHz, while even in a frequency range of up to 2.5 GHz the typical values are at least 50 dB. A triangular spring fits around the cable's braided shielding, and the design of the spring precludes its getting caught in the braiding if the assembly is dismantled.
Pflitsch says it is the only manufacturer so far to test its EMC cable glands in accordance with IEC 62153-4-10, and its involvement in establishing the KoKeT procedure, an Anglo-German acronym for Koaxial (coaxial measuring device), Kelvin (four-terminal sensing) and Tube (tubular construction), has made it a leader in this area. KoKeT has also now been incorporated into IEC 62153-4-10.
“The procedure can be used to test products in interference-compromised environments, and we can use it to check cable glands, cables and plug-in connectors individually. We can perform these measurements and tests in our laboratory on behalf of customers,” says Quednau.
Walter Logan & Co represents Pflitsch in the UK & Ireland
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