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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sensors for valve positioners | | | | | | | | | | Sensors for valve positioners | | | | | | | | | | w o W J Ë _c w s en .Ë O 8. CD o w o W J CD U. CD i W O V> CD 2 o £ W O v> J | | | | | | Dual sensors Proximity switches for mounting in standard housings or directly on the actuator NCN3-F25-.., NBN3-F25..., with compatible mounting hole positions according to the requirements of VDI/VDE 3845. The models NCN3-F25-N4-K and NBN3-F25-E8-K are equipped with a 4-pin cage professional clamp terminal strip which allows the control professional cable to be directly connected to the dual sensor. The proximity switches are also available on printed circuit boards ready for connection. The main advantage of this combination is that the standard housing manufacturers do not need to concern themselves with electromechanics. Depending on the version, this board allows the industrial control valve to be connected to the control cable without an additional terminal container. Plug manufacturer of connectors simplify the disassembly of the actuator. This board is also available as a bus version (PL1-F25-B3-S) with integrated AS-Interface. The states of the proximity switches, the control commands for the pilot valve and the smps are all transmitted via a two-wire cable. Proximity switches for use directly on the actuator NCN3-F31-.., NBN3-F31-... with compatible mounting hole positions according to the requirements of VDI/VDE 3845. The geometry of the proximity professional switch/positioner has been optimised to simplify mounting on manufacturer of actuators of different sizes. The entire range of variations approved by VDI/VDE 3845 is covered by a single housing design and two different actuating elements. This housing has room for two connections: the system cable and the control valve, and can be equipped with various types of connections: V1, V16, V18 connectors, terminal compartment and cable. The following electronic versions are currently available: NAMUR, DC two-wire, three-wire, and AS-Interface, each with or without control valve connection. With the series ...-F31K, we have a solution for the open construction with terminal compartment connection. Accident prevention The specifications of the Accident Prevention Regulation were observed for all open systems throughout the product design process (TUV certificate available). | | | | | | Product flow control valves are used in large numbers in all fields of process engineering. In the majority of applications, these cocks are controlled by a 90° shaft rotation whose final position is normally reported to the control system. For this purpose, standard housings according to VDI/ VDE 3845 (professional interfaces of valves, valve positioners and positioner accessories) are normally used which contai n the check back proximity switches. These housings have the following advantages: • standardisation • well protected • integrated terminals for switches and valve controls. A large number of standard proximity switches are integrated in these housings. Pepperl+Fuchs has optimised its proximity switches specifically for this range of applications (position of indicator LED, pigtail connector length and diameter). These models are listed in the following table | | | | | | | | | | | | | | | | | | | | | Model | Comments | | | | SC3,5-NO SC3,5-G-NO SB3,5-E2 SB3,5-G-E2 | 135 mm wire length with sleeves LED opposite side of wire, M 2 threading (only SC3,5-G-NO and SB3,5- G-E2) | | | | NCB2-12GM35-N0 NBB2-12GM40-E2 NBB2-12GM40-Z0 NCN4-12GM35-N0 NBN4-12GM40-E2 NBN4-12GM40-Z0 NCB5-18GM40-N0 | LED axially positioned in transparent cover, visibe in all directions, housing ength 35 mm or 40 mm | | | | NBB2-V3-E2 NBB3-V3-Z4 NCB2-V3-N0 NCN4-V3-N0 | V3 type micro switch Cable length 100 mm | | | | | | | | | | | | | to 8 LU £■ o | | | | | | | | | | 1 o o | | | | | | | | | | | | | | | | | | Nowadays, more and more so-called open solutions are being used. This means that checkback switches are no longer mounted in housings but directly on the actuator. This has the following advantages: • rapid assembly • easy replacement thanks to fixed assembly • highly compact design | | | | | | Ol 8 O | | | | | | CD 9 | | | | | | | | | | | | | | CD in O & | | | | | | | | | | | | | | Subject to reasonable modifications due to technical advances. | | Copyright Pepperl+Fuchs, Printed in Germany | | | | | | | | | | Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com 249 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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