Description
Product Overview
The Dwyer Mark II 26 is a wall‑mount differential pressure manometer engineered for accuracy and durability in demanding environments. Housed in a molded plastic case, the instrument measures pressure differentials from 0 to 7 inches water column (wc) with clear, easy‑to‑read dial markings. Its compact dimensions—7.9 x 7.1 x 2.1 inches—and lightweight design (1 lb) make it suitable for tight spaces. The device features a robust brass Bourdon tube, corrosion‑resistant fittings, and a calibrated scale that meets industry standards for HVAC, laboratory, and process control applications.

Usage
Designed for technicians and engineers, the Mark II 26 excels in monitoring static pressure across filters, ducts, and ventilation fans. It is commonly installed in air handling units, clean rooms, and water treatment facilities where precise low‑pressure readings are critical. The wall‑mount configuration allows quick visual checks without the need for handheld gauges, reducing downtime during routine maintenance. Its clear dial face remains legible even in low‑light conditions, supporting continuous operation in industrial plants, laboratories, and commercial buildings.
Why Choose Us
Dwyer Instruments has a reputation for over 80 years of precision measurement expertise. The Mark II 26 benefits from rigorous factory calibration and a quality assurance program that ensures each unit meets exacting performance criteria. The molded plastic enclosure provides impact resistance while keeping costs low, delivering a high‑value solution without sacrificing reliability. Additionally, Dwyer offers comprehensive technical support and readily available replacement parts, ensuring long‑term serviceability for your operation.
Key Features
- Accurate measurement range of 0‑7 in. wc for low‑pressure applications
- Molded plastic housing provides impact resistance and lightweight installation
- Clear, anti‑glare dial with calibrated markings for easy reading
- Robust brass Bourdon tube ensures long‑term stability and repeatability
- Wall‑mount design saves space and allows continuous visual monitoring
FAQ
What is the recommended installation height for the Mark II 26?
The instrument should be installed at a height that allows easy visual access for operators, typically between 4 and 6 feet from the floor, while ensuring the mounting surface is flat and secure.
Can the manometer be used with gases other than air?
Yes, the Mark II 26 can measure differential pressure for any gas that does not corrode brass, such as nitrogen or inert gases, provided the pressure range remains within 0‑7 in. wc.
How often should the device be recalibrated?
Dwyer recommends a full calibration check every 12 months or sooner if the instrument is subjected to harsh conditions or shows reading drift.
Is a separate power source required?
No, the Mark II 26 is a purely mechanical device and does not require any electrical power or batteries.
What accessories are available for this model?
Optional accessories include a protective cover, mounting brackets, and a calibration kit for field adjustments.




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