AV Sensors
Wall-Mounted Pressure Transmitters
HVAC-211 Series Loop-Powered Differential Pressure Transmitter
Wall-Mounted Ultra-Low-Pressure 4-20mA Transmitter
HVAC-211 Series
About the HVAC-211
The HVAC-211 Series is a two-wire, loop-powered 4–20 mA differential pressure transmitter designed for straightforward HVAC and building-automation installation. It combines front-access pressure ports, screw-terminal wiring, an LED power indicator, and external zero and span adjustments in a wall-mounted package.
Available pressure ranges extend down to 62 Pa full scale for ultra-low-pressure measurement. Minimal mounting-position sensitivity supports flexible installation for room-pressure, duct-pressure, fan, and other building-control applications.
HVAC-211 Series Features
-Two-wire, loop-powered 4–20 mA output
- Screw-terminal electrical connections
- Ultra-low differential-pressure ranges
- Minimal mounting-position sensitivity
- External zero and span adjustments
- Pressure connections for 1/8-inch ID tubing
- LED power indicator
Suggested Applications
Room-Pressure Monitoring
The HVAC-211 can measure the pressure difference between a controlled room and an adjoining corridor, anteroom, or reference space. Maintaining the intended positive or negative pressure relationship helps establish directional airflow between spaces and reduce the unintended movement of airborne contaminants. The transmitter’s 4–20 mA output allows the building-control system to continuously monitor the pressure relationship, record operating trends, and initiate an alarm when pressure moves outside the facility’s specified limits.
Cleanroom and Laboratory Pressure Monitoring
Cleanrooms, pharmaceutical laboratories, and other controlled environments commonly use cascaded pressure relationships to encourage airflow from cleaner spaces toward less-clean spaces—or toward a contained hazardous space when negative pressure is required. The HVAC-211 can provide the continuous differential-pressure signal used by a building-management system to verify that the intended room relationship is being maintained. Its ultra-low-pressure ranges are suited to the small pressure differences normally encountered between adjacent controlled spaces
Duct Static-Pressure Measurement
Connected to an appropriate static-pressure pickup in the duct, the HVAC-211 can measure supply or return duct static pressure and transmit the reading to an HVAC controller. The controller can use this feedback to monitor system operation or adjust fan speed and damper position as airflow demand changes. Continuous pressure measurement also helps identify conditions such as inadequate airflow, excessive resistance, or operation outside the intended control range.
Fan and Blower Monitoring
Differential pressure measured across a fan, blower, or selected section of an air-handling system can provide an indication that the equipment is operating and developing pressure. The HVAC-211 converts that measurement into a two-wire 4–20 mA signal for remote monitoring by the building-control system. Changes from the expected pressure can help maintenance personnel investigate fan operation, airflow restrictions, belt problems, damper position, or other system conditions.
Air-Filter Condition Monitoring
Pressure connections installed upstream and downstream of a filter allow the HVAC-211 to measure the pressure drop across the filter. As material accumulates, airflow resistance and differential pressure generally increase. Tracking that pressure through the building-control system can support condition-based filter maintenance, helping avoid both premature replacement and extended operation of a heavily loaded filter. Alarm thresholds must be established for the particular filter and airflow conditions.
Why Choose the HVAC-211 Series
Choose the HVAC-211 Series when the application requires a straightforward, loop-powered pressure transmitter without a numerical display or extensive configuration functions. The two-wire 4–20 mA output supports conventional building-control interfaces, while front-access pressure ports, screw terminals, external adjustments, and minimal mounting-position sensitivity simplify installation and commissioning.
Specifications
Performance
Accuracy
±1.0% FSS
Response Time
< 0.1 mS
Stability
±0.2% FSS /Yr (Typical)
Load Resistance
250Ω @ 24Vdc
Thermal
Operating Temperature
-25 to 70 ̊C
Thermal Errors
±0.02% FSS/ ̊F
Compensated Temperature
-10 to 60 ̊C
Electrical
Output
4-20mA (Loop Power)
Operating Voltage
12-30 Vdc
Reverse Voltage Protection
Yes
Load Resistance
250Ω @ 24Vdc
Maximum Ratings
Storage Temperature
-40 to 85C
Supply Voltage
-16 / 32 Vdc
Overpressure
2 / 5/ 10 / 21 (2/10/20/40 In20 Ranges)
Media Compatibility
Non Ionic, Non Corrosive Gases
Mechanical Dimensions
Model Number Configuration
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