Foxboro Eckardt SRD991 Intelligent Positioner (Hart)

The intelligent positioner SRD991 is designed to operate pneumatic valve actuators. Can use it from control systems (e.g. the Foxboro I/A Series System), controllers or PC-based configuration- and operational tools such as PC20 / IFDC or PC50 (FDT Software). The positioner is available with different communication protocols.

The multi-lingual full-text graphical-LCD in connection with the three pushbuttons allows a comfortable and easy local configuration and operation and the display of valve specific data and status- and diagnostic messages.

Device Feature of Foxboro Eckardt SRD991 Intelligent Positioner (Hart)

• Auto-start with self-calibration
• Self-diagnostics, status- and diagnostic messages
• Easy operation with three keys
• Multi-Lingual full-text graphical LCD, or LEDs
• HART, FOUNDATION Fieldbus H1, PROFIBUS-PA, FoxCom
• Configuration by means of local keys, handheld terminal (HART), PC or I/A Series system or with an infrared interface by means of IRCOM
• Input signal 4 to 20
• Stroke 8 to 120 mm / 260 mm (0.3 to 4.7 in / 10.2 in)
• Angle range up to 95 °
• Supply air pressure up to 6 bar (90 psig), with spool valve up to 7 bar (105 psig)
• Single or double-acting
• Mounting on linear actuators according to NAMUR
• IEC 534, Part 6 – VDI/VDE 3847
• Mounting on rotary actuators acc. to VDI/VDE 3845
• Protection class IP 65, NEMA 4X
• Explosion protection: Intrinsic safety according to ATEX and FM/ CSA

Functional Specifications

Travel range

• Stroke range . . . 8 to 260 mm (0.3 to 10.2 in)with standard feedback levers; special levers on request
• Rotation angle range . . . up to 95° without mechanical stop

Supply

• Supply air pressure . . . . . . . 1.4 to 6 bar (20 to 90 psig) with spool valve 1) . . . . . . 1.4 to 7 bar (20 to 105 psig) Output to actuator . . . . . . . . 0 to ~100 % of supply air pressure (up to 5.5 bar at 6 bar supply air pressure) with spool valve heavy duty2): 4 to 10 bar Air supply. . . . . . . . . . . . . . . according to ISO 8573-1
• Solid particle size and density class 2
• Oil rate. . . . . . . . . . . . . . . class 3
• Pressure dew point 10 K under ambient temperature

The use of a filter regulator for the air supply of the positioner is strongly recommended. It reduces the air pressure to the actuator’s maximum pressure and keeps it constant.

Volume Booster Series For large actuators or to reduce action time, a volume booster may be necessary VBS100/VBS110

Volume boosters with Cv1 and pneumatic connection 1/4”, for remote mounting VBS100 in Aluminium, VBS110 in Stainless Steel 316 For more information please consult PSS EVE0601