Product Description

The Honeywell L408A 1132 is a pneumatic pressure controller, commonly referred to as a VaporStat, designed for precise pressure control in vapor heating systems. It features a stainless steel diaphragm, making it suitable for use with noncombustible gases such as ammonia, oxygen, and distilled water. The controller includes an adjustable subtractive differential and is equipped with a dustproof, mercury-free snap switch. Its compact design allows for direct mounting to a steam trap (siphon loop) or surface mounting via screws. The clear plastic cover enables easy observation of pressure settings and switch action.​

Technical Specifications

• Model: L408A 1132
• Type: Pneumatic Pressure Controller (VaporStat)
• Pressure Range: 0 to 4 psi (0 to 0.28 kg/cm² or 0 to 27.6 kPa)
• Switch Type: Single-Pole Single-Throw (SPST)
• Switch Action: Breaks on pressure rise
• Differential: Adjustable subtractive
• Diaphragm Material: Stainless steel
• Maximum Surge Pressure: 15 psi (103.4 kPa)
• Mounting Options:
• Direct mounting to 1/4-18 NPT internal threads (steam trap/siphon loop)
• Surface mounting via screws through back case knockouts
• Enclosure: Clear plastic cover for visibility of settings and switch action
• Operating Temperature Range: Not specified
• Certifications: Not specified