The SAMSON Type 6493 is a pneumatic differential pressure controller used for maintaining a constant differential pressure between two points in a process system. It is a classic, force-balance type controller with a diaphragm measuring system. No electricity is required — it uses only supply air to produce a pneumatic output signal. Many older plants and safety-critical systems still use it because of its simplicity, high reliability and long service life in harsh environments.

• Steam distribution systems (differential pressure control)
• Pump bypass and recirculation lines
• Heat exchanger differential pressure control
• Tank blanketing and pressure equalization
• Older pneumatic control loops in refineries, power plants and chemical facilities

• Problem: Slow response or hunting → Solution: Adjust proportional band and reset time carefully
• Problem: Dirt in supply air → Solution: Install upstream filter-regulator (standard recommendation)
• Problem: Zero drift over time → Solution: Periodic recalibration of setpoint springs

• Current SAMSON Type 6493 (still in production)
• Older SAMSON 6493 variants
• Comparable: SAMSON Type 2405 / 2412 pneumatic regulators (for related pressure tasks)

• Genuine SAMSON factory product with calibration certificate
• Local technical support & loop tuning assistance
• Fast spare parts availability (diaphragms, springs)
• Competitive pricing with full warranty

• Standard models (common set point ranges): in stock or 4–6 weeks
• Special configurations (high pressure, stainless body): 6–8 weeks

Please provide the following (we usually reply within 24 hours):

• Required set point range (differential pressure)
• Supply air pressure available
• Process medium & temperature
• Connection type (threaded / flanged)
• Quantity & target delivery date
• Any special requirements (Ex version, etc.)