FEATURES
• Configuration by means of switches and potentiometers
• 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
• Protection class IP 66 and NEMA 4X
• Explosion protection:
II 2 G Ex ib/ia IIB/IIC T4/T6 according to ATEX
or “Intrinsic Safety” according to CU TR
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 exchange
of the electronic motherboard
