The analog Positioner SRI990 with analog input 4 to 20 mA is designed to operate pneumatic valve actuators. It offers an easy adjustment by means of switches and potentiometers. The modular structure of this positioner series enables conversion from an analog to a “intelligent” positioner by easy exchanging the electronics.
In version “Electrical Position Transmitter” SRI990-T the device includes the option Position Transmitter but no con- troller and no pneumatic components. The positon of actuator is given as 4 – 20 mA output signal.

Further versions see next page.


  • Configuration by means of switches and potentio- meters

  • Load 300 Ω

  • Low air consumption

  • Stroke 8 to 260 mm (0.3 to 10.2 inch)

  • Angle range up to 95 degree

  • Supply air pressure up to 6 bar (90 psig), with spool valve up to 7 bar (105 psig)

  • Single acting or double acting

  • Mechanical travel indicator

  • Position transmitter 4 – 20 mA as option

  • Attachment to stroke actuators directly or according to IEC 534 part 6 (NAMUR)

  • Attachment to rotary actuators according to VDI/VDE 3845

• Protection class IP 65 (IP 66 on request) and NEMA 4X

• Explosion protection:
II 2 G EEx ia IIC T6 according to ATEX
or “Intrinsic Safety” according to FM and CSA

Additional equipments (compatible to SRD991):
• Integrated inductive limit switches, independent of

device electronics

Accessories (compatible to SRD991):

  • Gauge attachment for supply air and outputs

  • Booster relay

  • SRI990 can be upgraded to a SRD991 by exchan- ge of the electronic motherboard