Dwyer 1211-72 Slack Tube Manometer 50 Psi 36 in Wc

Product Description

The DWYER 1211-72 is a slack tube manometer designed to measure differential pressure across HVAC systems, ductwork, filters, and air handling equipment. With a measurement range of -36 to 36 inches water column and a maximum pressure rating of 50 psi, this instrument gives HVAC technicians and test-and-balance professionals a reliable analog reference tool for field pressure diagnostics. The plastic body and case construction keep the unit lightweight at 2.5 pounds, making it practical for portable use on the job site. It is rated for environments up to 130 degrees F, suitable for most mechanical room and rooftop applications.

This manometer is used in residential and light commercial HVAC applications where technicians need to verify static pressure, measure pressure drop across coils or filters, or confirm airflow performance. Its water column scale is well suited to low-differential-pressure readings common in forced-air systems. The 36-inch water column range covers the typical diagnostic needs of duct leakage testing, filter restriction checks, and equipment commissioning work.

Key Features

• Measurement range of -36 to 36 inches water column for low-differential-pressure HVAC diagnostics
• 50 psi maximum pressure rating provides a safety margin during testing
• Plastic body and case construction for lightweight field portability at 2.5 pounds
• 130 degrees F maximum operating temperature suits rooftop and mechanical room environments
• Compact width of 2.17 inches for easy handling and storage in a service bag

Compatibility

Designed as a general-purpose slack tube manometer for use in residential and light commercial HVAC pressure measurement applications where differential pressure readings in inches water column are required.

Installation Notes

This instrument is typically used by licensed HVAC technicians and test-and-balance contractors. Before connecting to an active system, confirm that system pressure does not exceed the 50 psi maximum rating. Use appropriate flexible tubing connections at both the high- and low-pressure ports and ensure fittings are leak-free before taking readings. Protect the unit from exposure to temperatures above 130 degrees F and avoid contact with corrosive gases or fluids not compatible with plastic construction.