Dwyer Instruments MSX-W20-IN-LCD Transmitter

Professionals in the field recognize the Dwyer Instruments MSX-W20-IN-LCD as the direct successor and functional cross to the legacy MS-221-LCD. This Magnesense MSX Series differential pressure transmitter is engineered for high-stability monitoring in HVAC automation systems and critical environments. It supports a 0.5" water column range with selectable accuracy levels of ±0.1%, ±0.25%, and ±0.5%, providing the precision required for duct static pressure measurement and cleanroom pressure control. Field versatility is a core focus; the unit features a toolless terminal block and a 180° rotatable LCD for immediate status verification in tight mechanical spaces. With 4-20 mA, 0-10V, and 0-5V selectable outputs, it integrates seamlessly into existing BAS (Building Automation Systems). Built-in square root extraction also allows for real-time air velocity and flow monitoring in VAV systems, making it a rugged, multi-purpose tool for any contractor's inventory.

Key Benefits for Contractors

• Field Selectable Performance: Easily toggle between unidirectional or bidirectional pressure measurement and adjust response times for system damping.
• Simplified Installation: The wall-mount housing includes a 1/2" NPS threaded electrical entry and a flame-rated UL94 V-0 enclosure for plenum-rated applications.
• Advanced Signal Handling: Supports simultaneous control and verification with dual output signaling and digital push-button zero and span calibration.
• Flow Calculation Logic: Integrated square root extraction eliminates the need for external math modules when monitoring air handling unit filter banks.

Common Questions

Can this unit replace an older MS-221-LCD?
Yes, the MSX-W20-IN-LCD is the designated replacement, offering the same footprint with improved digital accuracy and mounting flexibility.

What output signals are supported by the MSX series?
The transmitter is highly adaptable, supporting 4-20 mA (2-wire), 0-10V, or 0-5V (3-wire) configurations to match your specific controller requirements.

Is the display readable in overhead duct installations?
The integrated LCD display is rotatable by 180 degrees, ensuring technicians can read pressure values regardless of the orientation of the housing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.