Why So Many Plants Stick with the 3800

The Logix 3800 has been around for years and just keeps going. It’s the basic digital positioner for regular control valves – nothing fancy, but it tunes itself in a minute, holds position tight, and survives dirty air and vibration. Maintenance guys like it because the setup is simple, the display shows what’s wrong, and spare parts are always in stock. Most factories have a mix of old pneumatic positioners and 3800s, and they’re slowly replacing everything with these.

Things That Make Daily Life Easier

• One-button quick calibration – done in under a minute
• Big LCD screen – read it from the ground
• HART communication – talk to it with any handheld
• Low air bleed – saves compressor power
• Aluminum housing – light but tough
• Works on linear and rotary valves
• Explosion-proof and intrinsic safety options

Main Specs

Where You See Them Every Day

• General process control valves
• Steam and water lines
• Chemical dosing
• Power plant auxiliary systems

Common Questions

Q: How long does calibration take?A: Usually 45–90 seconds with one button.

Q: Does it replace old pneumatic positioners?A: Yes – same mounting kits, drop-in swap.

Other Positioners

• Logix 3200MD – explosion-proof version
• Logix 520MD – basic digital one
• PMV D20 – compact alternative