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Phone：+86 17062388866Description
The FOXBORO H92 is a precision pneumatic differential pressure transmitter developed by Foxboro (now part of Schneider Electric), engineered for critical process measurement in legacy industrial control systems. Designed primarily for steam, liquid, and gas flow applications, this robust transmitter converts differential pressure (ΔP) into a proportional 3-15 psi pneumatic output signal, enabling seamless integration with pneumatic controllers, recorders, and valve actuators. The FOXBORO H92 features all-welded 316L stainless steel construction with dual diaphragm seals, ensuring exceptional corrosion resistance and long-term stability in high-temperature/pressure environments like power plants, refineries, and chemical processing units.
As a cornerstone of Foxboro’s pneumatic instrumentation legacy, the H92 provides intrinsically safe operation without electrical power, making it ideal for hazardous areas (Class I Div. 1). Its modular design allows direct mounting on orifice plates or impulse lines, minimizing installation complexity. For facilities maintaining pneumatic control loops or requiring SIL 2 safety compliance, the FOXBORO H92 remains a trusted solution for reliable, maintenance-free ΔP measurement with ±0.25% accuracy.
FOXBORO H92
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | FOXBORO H92 |
| Manufacturer | Foxboro (Schneider Electric) |
| Product Type | Pneumatic Differential Pressure Transmitter |
| Output Signal | 3-15 psi pneumatic |
| Accuracy | ±0.25% of span |
| Pressure Ranges | 0-5″ H₂O to 0-1,000 psi |
| Operating Temperature | -40°F to +250°F (-40°C to +121°C) |
| Wetted Materials | 316L SS diaphragms, Hastelloy® C seals |
| Supply Pressure | 20 psi (clean/dry air) |
| Static Pressure | 2,000 psi max |
| Response Time | <1> |
| Intrinsic Safety | Class I Div. 1 Groups A-D (FM/CSA) |
| Housing Protection | NEMA 4X (IP66) |
Main Features and Advantages
Extreme process durability: Welded metal isolation diaphragms eliminate O-rings, preventing leaks in corrosive media like chlorine or sulfuric acid. The FOXBORO H92 withstands 5x overpressure without calibration shift.
Maintenance-free operation: Pneumatic relay design requires no external power or electronics. Continuous self-draining condensate chambers prevent moisture buildup in steam applications.
Safety by design: Intrinsically safe construction eliminates explosion risks in hydrocarbon processing. Optional flame arrestors protect against pipe rupture events.
Legacy compatibility: Direct 1:1 replacement for obsolete Foxboro H10/H20 series. Standard 5-hole flange mounting fits existing impulse lines.
Application Field
The FOXBORO H92 dominates:
Power Generation: Measures feedwater flow via orifice plates in coal-fired boilers (250°F steam)
Oil & Gas: Monitors crude pipeline ΔP across strainers at offshore platforms (Class I Div. 1 zones)
Chemical Processing: Controls reactor feed ratios in sulfuric acid alkylation units
Pharmaceuticals: Regulates clean steam flow in SIP (sterilize-in-place) systems
Pulp & Paper: Tracks black liquor flow in recovery boilers
FOXBORO H92
Related Products
Foxboro H10: Lower-range predecessor (0-100″ H₂O)
Foxboro E13: Electronic DP transmitter upgrade path
Foxboro 556: Pneumatic controller for loop integration
Foxboro 546: Pneumatic valve positioner
Foxboro P51: Pressure-to-current converter (I/P)
