SRD998 Intelligent Positioner with HART Communication
The intelligent positioner SRD998 is designed to operate pneumatic valve actuators and can be operated from control systems (e.g. the Foxboro I/A Series System and Foxboro Evo™), controllers or PC-based configuration and operation tools such as the FDT/DTMs VALcare™. The positioner is available with HART 7 communication protocol. The extra large multi-lingual full text graphical-LCD, in conjunction with the rotary selector, allows a comfortable and easy local configuration and operation. For installations in contact with explosive atmospheres certificates are available.
SRD998 Intelligent Positioner with HART Communication
• Angle range up to 95 ° (up to 120 ° on request)
• Mounting onto any linear or rotary actuator
• Supply air pressure up to 10 bar (145 psig)
MAIN FEATURES
Intelligent
• Auto-start with self-calibration
• Self diagnostics, status- and diagnostic messages
• DTM for valve diagnostics and predictive maintenance
• Easy local operation with the rotary selector
• Extra large multi-lingual full text graphical LCD
• With HART 7 communication
• Stroke 8 to 260 mm (0.3 to 10.2 in) with standard lever; larger stroke with special lever
1 METHOD OF OPERATION
1.1 General
The intelligent positioner SRD998 1 and the pneumatic actuator 2 form a control loop with the set point value w (from master controller or control system), the output pressure y and the position x of the actuator on valve 3. The positioner can be attached to both linear and rotary actuators. Actuators with spring force are controlled by a single acting positioner. Actuators without spring force are controlled by
a double acting positioner.
HART Version:
The positioner can be operated locally by means of Rotary Selector and LCD, Hand Held Terminal, remotely via PCbased configuration like FDT / DTM or a corresponding control system, e.g. I/A Series System.
1.2 Block diagram
1.3 Operation
With the intelligent positioner with input signal 4-20 mA and superimposed HART signal, the supply takes place via the power signal adjacent to the input. By means of voltage converter 7, derivation of the internal supply of the electronics takes place. The current value is measured, in A/D transformer 9 converted, and directed via switch 10 to digital controller 11. The output of controller 11 drives the electro-pneumatic converter (IP-module) 12, controlling a pre-amplifier 13, the single acting (or double acting) pneumatic power amplifier 14. The output of the amplifier 14 is the output pressure y to the actuator.
The pneumatic amplifiers are supplied with supply air s 1.4 to 6 bar (20 to 90 psig). The position x of the actuator is sent to the control unit 11 by the position sensor (conductive plastic potentiometer) 15. Optional gauges 16 enable additional diagnostic indications. Adjusting, start-up of the positioner as well as the demand for internal information can be made using the Rotary Selector 17, with indication given by LCD 18.
For more information on placing your SRD998 Intelligent Positioner order, you can contact our Sales Manager on frikkie@kvcontrols.co.za or 063 433 1363.
Our organisation is committed to achieving excellence in quality performance. KV Controls undertakes all activities in a highly responsible, professional and competent manner and strives to continuously improve performance towards an ultimate objective of zero incidents , failures or complaints together with maximum efficiency and customer satisfaction.
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KV Controls will add value to your business, whether you are one of our satisfied customers in the Mining, Chemical, Petro-Chemical or Pulp & Paper industry or a potential buyer. We supply valves for control, on-off or isolation for liquids, steam, gas and slurries. Our KV Controls valve selection software gives us calculated results for selecting the best product for your application.
