AV Sensors
Wall-Mounted Pressure Transmitters
MSX 7301DI Differential Pressure Transmitter with Display
Wall-Mounted Ultra-Low-Pressure 4-20mA Transmitter with Display
MSX 7301DI Series
About the MSX 7301DI
The MSX 7301DI Series combines ultra-low differential-pressure measurement, a six-digit segmented display, and a continuous 4–20 mA output. Technicians can verify pressure locally while the building-control system receives an analog transmitter signal.
The transmitter incorporates wall-mounting hardware, ribbed pressure connections, screw-terminal wiring, and an integrated cable gland in an IP64-rated enclosure. It is designed for building-control applications requiring both local pressure indication and remote system monitoring.
MSX 7301DI Series Features
- Six-digit segmented pressure display
- Wall-mounting plate for straightforward installation
- Ultra-low differential-pressure measurement
- Ribbed pressure connections for 5 mm ID tubing
- Integrated cable-gland connection
- Low overall error
- ABS V-0 housing with IP64 enclosure rating
- Fast response time
Suggested Applications
Building Room-Pressure Monitoring
The MSX 7301DI can measure the pressure difference between a room and an adjoining corridor, anteroom, or reference space. The local segmented display gives technicians immediate confirmation of the pressure at the installation, while the 4–20 mA output sends the same operating measurement to the building-control system. This combination is useful where personnel need both on-site indication and centralized monitoring of positive or negative room-pressure relationships.
Cleanroom and Controlled-Space Monitoring
Pharmaceutical, semiconductor, laboratory, and other controlled environments use pressure differences to establish directional airflow between spaces with different cleanliness or containment requirements. The MSX 7301DI allows operating personnel to verify the differential pressure locally without accessing the building-management interface. Its transmitter output can simultaneously support remote display, trend recording, and alarms when the measured pressure falls outside the limits established for the facility.
Duct Static-Pressure Measurement
When connected to an appropriate duct static-pressure pickup, the MSX 7301DI can provide local and remote indication of supply, return, or exhaust duct pressure. The displayed value helps technicians evaluate system conditions during commissioning and maintenance, while the 4–20 mA signal allows the HVAC controller to monitor pressure continuously. The measurement can support fan-speed control, damper adjustment, or diagnosis of unexpected airflow resistance.
Fan and Air-Handling Equipment Monitoring
The transmitter can measure differential pressure across a fan or selected section of an air-handling system to indicate whether the equipment is developing the expected pressure. Local indication helps technicians check operation at the equipment, and the analog output makes the measurement available to the building-control system. A significant change from the established operating pressure can prompt inspection of the fan, belt, damper, filter, or associated airflow path.
For chiller applications, this use refers to fans and air-handling equipment associated with the chiller system. The MSX 7301DI should not be presented as measuring refrigerant or chilled-water pressure.
Air-Handler Filter Monitoring
By connecting the positive and negative pressure ports on opposite sides of an air filter, the MSX 7301DI can display and transmit the filter’s differential pressure. Increasing pressure drop can indicate increasing airflow resistance as the filter loads with captured material. The display supports inspection at the air-handling unit, while the 4–20 mA output enables centralized trending and maintenance alarms based on limits selected for the filter and operating airflow.
Why Choose the MSX 7301DI Series
Choose the MSX 7301DI Series when the application requires both local numerical pressure indication and a conventional 4–20 mA building-control signal. The display allows technicians to verify equipment operation at the installation, while the transmitter output provides continuous information to the control system. Its wall-mounting plate, integrated cable gland, and IP64 enclosure support practical building-automation installation.
Specifications
Performance
Accuracy
±0.5% Rdg ± 0.5FSS
Response Time
< 0.1 mS
Resolution
0.1 Pa
Output Load
500 Ω
Thermal
Operating Temperature
-45 to 70 ̊C
Compensated Temperature
0 to 50 ̊C
Passive Compensation
Thick Film, Individually Trimmed
Electrical
Output
4-20 mA
Operating Voltage
12-30 Vdc
Reverse Voltage Protection
Yes
Output Load
500 Ω
Maximum Ratings
Storage Temperature
-55 to 85 C
Supply Voltage
-24 / 36 Vdc
Over Pressure
3X Range
Media Compatibility
Non Ionic, Non Corrosive Gases
Mechanical Dimensions
Model Number Configuration
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