SRD991 Stainless Steel Intrinsically Safe Positioner
We are the exclusive worldwide distributor of BLX positioners outside of the US.

To make an enquiry please email sales@ascendant-technologies.com or call +44 (0)1495 767210.

BLX V100

This line of pneumatic and electropneumatic positioners incorporates over sixty years of design, manufacturing. It has created one of the most durable and reliable instruments on the market.

Cast Aluminum, polyester housing that is Nema 4X rated. All stainless steel retained fasteners. A thick stainless steel cam that is double locked with sturdy cam nut. The bottom plate helps absorb vibration.

Simple Calibration
Screw driver slots in the span and zero ferrules, along with an external zero adjustment, helps make setting up the positioner simple.

Special cams, range springs, various pilots, spindles (drive connectors), gauges, dome indicators, and position feedback are examples of the options that are available.

Maintenance Friendly
The pilot valve assembly can be easily cleaned (dry alcohol base) by removing one screw and blowing the assembly clean. The unique O-ring gasket prevents loss of individual O-rings in the cleaning process.

One housing for pneumatic or electro-pneumatic, where I/P can be installed, removed, or converted at any time-while still mounted on the actuator. Various mounting capabilities – rotary or linear.


  • Safe Area 3-15 psi and 4-20 mA versions
  • Intrinsically Safe
  • Explosion Proof
  • Stainless steel
  • Integral limit switches for feedback
  • Integral 4-20mA transmitters
  • HART capable devices
  • On-board diagnostics
  • High temperature versions
  • Low temperature versions to -40C
  • Fieldbus options including Profibus and FF
  • Partial stroke facility local and remote
  • Gauge blocks
  • Volume booster


  • ATEX
  • CSA/UL
  • GOST-R and RTN

Additional Services

  • Mounting kit design using CAD for linear and rotary actuator designs