Bürkert Fluid Control Systems has enhanced the technical features and appearance of its digital flow transmitters. The models 8026, 8036 and 8076 now shine in the consistent stainless steel design of the ELEMENT series. New processors, new software, additional features and an innovative operating concept distinguish the next generation of these successful Bürkert transmitters.
Bürkert has expanded its line of digital electropneumatic positioners for pneumatic actuators with the SideControl 8791 Basic; the new version, which has no display, is designed for universal applications at an excellent cost-performance ratio.
The new 8791 positioner is the basic version of the SideControl 8792 and 8793 positioners introduced in July 2009 and is specially designed for ease of operation. Yet the SideControl 8791 features the same reliable pneumatic positioning system for excellent control accuracy and dynamics. As it can be mounted in various different ways to linear and rotary actuators according to IEC534-6 and VDI/VDE 3845 （Namur） as well as to Bürkert process valves, the 8791 is extremely flexible and suitable for a wide range of applications. This positioner is also ideal for use in harsh environments due to its compact, sturdy aluminium housing with protection class IP65/67.
Reliable and user-friendly
Since there is no display and the software has been simplified, the 8791 positioner is a good alternative for applications where no further configuration on site is neither necessary nor desired. The only controls on the device are used to call up preset values. Other parameters for the positioner can be configured from a PC connected via the RS232 interface, using PACTwareT.
For universal applications
The SideControl 8791 from Bürkert uses 3-wire technology. This makes the controller much less expensive than a comparable device based on 2-wire technology; nevertheless, it is approved for ATEX zones 2/22. A further cost benefit to the user is the smaller number of versions required. The Bürkert positioner can be used as the sole positioning system for the entire compressed air supply, directly from the network and without costly pressure reduction. The 8791 offers one solution for both single and double acting actuator systems. This allows customers to reduce their stock of controllers to a minimum. The positioning system features an impressive control air pressure range of 1.4 to 7 bar and a high air power range of 7 to 100 l/min （150 l/min at 6 bar）. When fully regulated, no control air is consumed.
Facts and data
§ Setpoint value via norm signal 0/4-20 mA
§ Analog position feedback （4-20 mA）
§ Binary input with parameterizable function
§ Control of basic functions via internal DIP switches and buttons
§ Configuration and parameterization of additional functions via PC tool
§ Valve end position detection by discrete inductive proximity switches
§ Mechanical position indication
§ Single and double acting version in one unit
§ Control air pressure 1.4 to 7 bar
§ Operating voltage 24VDC +/- 10%
§ RS232 port for communication and parameterization
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More than just a facelift
The beautiful stainless steel housing in the design of the ELEMENT series and the removable displays with backlight are the most obvious changes to the new Bürkert flow meters. However, the re-designed housing also conceals numerous other technical improvements, as a result of complete re-engineering. The new features include future-proof system architecture with a new processor and new software to optimize the performance of the sensors. To guarantee maximum reliability and quality, the same circuits are used for conductivity and pH/ORP measurement as those used in the Bürkert ELEMENT transmitter models 8222 and 8202.
Standardized stainless steel design for controllers, valves and sensors
The flow transmitters with 4-20 mA output are available in two versions: Basic （1 NPN transistor output） and Advanced （two NPN/PNP transistor outputs）. They comply with the stringent UL safety standards and provide long-lasting and reliable IP protection in protection class IP 65/67. The stainless steel housing of the Bürkert ELEMENT design provides for a standardized, high-quality appearance within the system, in addition to being very durable and resistant to cleaning chemicals. This makes the flow transmitters ideal not only for use in water treatment and process automation, but also for food and beverage, dairy, brewing, cosmetics and pharmaceuticals.
Innovative operating concept
The removable displays of the flow transmitters are programmable and equipped with backlight for easier operation. All customer-specific settings, such as the measuring range, units of measurement, pulse output and filters are configured directly at the device. The programming itself is done using a joystick. Moving it horizontally/vertically line and rows are selected and activated by pushing the joystick. This control button is used to set parameters, define and save configurations and to start the unit.
The new flow transmitters at a glance
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§ Beautiful stainless steel housing in standardized ELEMENT design
§ Long durability and outstanding availability
§ Removable, programmable display with backlight
§ Programming via joystick
§ New processors and software
§ Future-proof system architecture
§ Protection class IP 65/67
§ Resistant to cleaning chemicals
§ Up to two 700 mA transistor outputs
§ Analog outputs 4-20mA
§ UL approved
