The Dwyer 677B-12 Differential Pressure Transmitter is a high-precision instrument designed for measuring low to moderate differential pressures, with a maximum pressure limit of 15 psi (100 kPa). Constructed with 302 stainless steel wetted materials, it offers ±0.4% full-scale accuracy and reliable performance in applications such as building energy management, HVAC systems, and environmental control. Its rugged NEMA 4 housing and versatile mounting design ensure durability and easy installation in diverse industrial and commercial environments.

• High Accuracy & Stability: Delivers ±0.4% FS accuracy for precise pressure measurement, with long-term stability of ±1% FS per year, minimizing drift and reducing calibration frequency.
• Durable Construction: Wetted materials made of 302 stainless steel, ensuring compatibility with clean, dry air and non-corrosive gases. NEMA 4 housing protects against dust and water, suitable for both indoor and outdoor mounting.
• Enhanced Protection: Equipped with reverse polarity protection and EMI/RFI shielding, safeguarding against electrical interference and wiring errors, ensuring consistent operation in noisy electrical environments.
• Flexible Installation: Integral mounting tabs with slots (suitable for #6 and #8 screws) simplify secure mounting on flat surfaces, junction boxes, or beams. Designed for vertical baseplate mounting (factory-calibrated in this orientation) with optional field adjustment for other orientations.
• Low Maintenance: Factory-calibrated with minimal field adjustment required (zero adjustment only if necessary). No routine maintenance needed; filter-equipped pressure ports handle extreme dust or moisture conditions in most applications.