Product Description
The AI 32 Differential Pressure Switch has been specially developed for differential pressure applications in heating & air conditioning systems, air handling units (AHUs), ventilation systems, and cleanrooms. It is used for airflow proving, air filter status detection, and fan performance control in HVAC and industrial environments.
This highly sensitive switch is capable of detecting very small pressure differences and features an adjustable switching set-point with an integral calibrated visual scale. The switching point can be easily adjusted on-site without the use of a manometer.
The AI 32 functions as a pressure-actuated switch that activates connected controllers, dampers, fans, or external alarm systems when the preset differential pressure point is reached. A transparent protective cover prevents unintended setting changes while providing IP54 protection, making the switch suitable for demanding industrial applications.
Features
- Highly Precise Pressure Switching
Engineered to sense minute pressure changes. The product is perfectly suited for reliable airflow & filter monitoring applications.
- Field Adjustable Setpoint
Switch point is quickly & conveniently adjustable on-site using the integral calibration scale.
- Stable HVAC Operation
Provides reliable operation with stable switching accuracy for HVAC, ventilation & industrial air management.
- Durable Industrial Construction
Built with a rugged housing and a protective transparent cover to assure long life operation even in tough industrial environments.
- IP54 Protected Design
An IP54 enclosure protects interior parts from dust and external influences.
- Easy Installation
Compact to facilitate installation with wall or panel mount within AHU's, ducts, ventilation lines and controls.
- Air & Non-Corrosive Gas Compatible
Accepts both air and clean gaseous non-corrosive media suitable for commercial & industrial uses.
Applications
- Control and Monitoring of HVAC Airflow The AI-32 differential pressure switches are used in office buildings, shopping malls and more for monitoring airflow and air pressure within the air ducts to achieve a balanced condition. Abnormal pressure conditions such as filter blockages or duct irregularities are detected, helping maintain better indoor air quality and a comfortable environment.
- Air Handling Unit Protection The AI-32 series of DP Switches are compatible with AHUs and monitor air filters along with fan differential pressures. Hospitals, laboratories and pharmaceutical settings where air quality is important are monitored to maintain cleanliness of airflow within the facility. Warnings of filter blockage or fan failure are triggered to reduce the negative impact on air quality.
- Condition Monitoring of Air Filters The AI-32 detects blockage of air filters. In the manufacturing sector, these switches notify users of an increase in pressure loss, helping to replace filters promptly for smooth functioning and clean air.
- Fan/Blower Operation Monitoring In case of a failure, a warning is triggered when there is a change in pressure along the ventilation line. Industrial exhaust systems can also benefit from this to alert operators if a fan malfunctions.
- Ventilation Airflow Verification In laboratories and processing industries, these switches ensure there is a sufficient amount of airflow at all times. In these areas, a continuous supply of airflow is necessary for user safety and smooth operations.
- Controlling Cleanroom Pressure These switches are used to manage and balance pressure differentials in cleanrooms to prevent contamination from spreading to adjacent rooms in pharmaceutical and semiconductor industries.
- Supervision of Industrial Ventilation Systems Used in industrial settings, factories and processing plants to maintain optimal air pressure within ventilation systems for efficiency and safety.
- Detection of Filter Blockage Used for detecting blocked filters in data centers, hospitals and other facilities. They identify when the pressure difference exceeds a set limit, warning operators to take timely action.
- Building Automation and Control Systems (BMS) The AI-32 SPDT relay output connects to BMS panels, triggering alerts and automated responses when pressure thresholds are breached, enabling facility operators to respond faster to problems and ensure higher efficiency and reliability of the entire system.
- Pressure Monitoring for Process Applications Used in a variety of industrial processes that require a certain level of airflow for correct functionality. These are generally found in packaging applications, the electronics industry and automation systems.
Specifications
Gain insight into your IAQ solution and know technical specifications
Frequently Asked Questions (FAQs)
1. What is the AI-32 Differential Pressure Switch?
The AI-32 is a mechanical differential pressure switch designed to monitor pressure differences between two points and activate an electrical contact when the pressure reaches a preset value. It is commonly used for HVAC systems, air filters, cleanrooms, ventilation systems, and industrial air handling applications where automatic switching or alarm functions are required.
2. What is a differential pressure switch?
A differential pressure switch compares the pressure between two ports and changes the state of its electrical contacts when the pressure difference reaches a user-adjustable setpoint. Unlike a pressure transmitter that continuously measures and transmits pressure values, a pressure switch simply provides an ON/OFF signal for control or alarm purposes.
3. Why is differential pressure monitoring important?
Differential pressure monitoring helps maintain proper airflow, detect clogged filters, verify fan operation, monitor cleanroom pressurization, and protect HVAC equipment. It enables maintenance teams to identify system problems early and maintain efficient operation.
4. Where is the AI-32 commonly installed?
Typical applications include:
- Air Handling Units (AHUs)
- HVAC air filters
- HEPA and bag filters
- Cleanrooms
- Isolation rooms
- Ventilation ducts
- Laboratory ventilation systems
- Industrial air handling systems
- Pharmaceutical manufacturing facilities
- Hospitals
5. What does the AI-32 monitor?
The AI-32 monitors the pressure difference between two points. It can be used to detect filter blockage, fan failure, airflow loss, room pressurization changes, or other pressure-related conditions that require an alarm or control action.
6. How does a differential pressure switch work?
The AI-32 senses the pressure difference between its high-pressure and low-pressure ports. When the measured pressure reaches the user-adjustable switching point, the internal microswitch changes state. This electrical contact can then activate alarms, start or stop equipment, or send a signal to a Building Management System (BMS) or PLC.
7. Can the AI-32 monitor air filter condition?
Yes. The AI-32 is commonly installed across HVAC filters to monitor pressure drop. As the filter collects dust and debris, the pressure difference increases. When the pressure reaches the preset limit, the switch activates an alarm or maintenance signal, indicating that the filter should be cleaned or replaced.
8. Can the AI-32 be used for cleanroom pressure monitoring?
Yes. The AI-32 can monitor positive or negative room pressure in cleanrooms, laboratories, and isolation rooms. When the room pressure falls outside the desired range, the switch activates an alarm or control system to notify operators immediately.
9. Can the AI-32 control fans or alarms?
Yes. The electrical switching contacts can be connected to:
- Exhaust fans
- Supply fans
- Alarm buzzers
- Warning lights
- Building Management Systems (BMS)
- PLC control panels
This allows automatic control and immediate response whenever the preset pressure level is reached.
10. Does the AI-32 require external power?
No. The AI-32 is a mechanical differential pressure switch and does not require an external power supply for pressure sensing. It simply changes the state of its electrical contacts when the preset differential pressure is reached, making it reliable and easy to install.
11. Can the AI-32 be adjusted for different pressure setpoints?
Yes. The switching pressure is adjustable, allowing users to configure the switch according to the requirements of their HVAC system, filter monitoring application, or cleanroom pressure control system.
12. Is the AI-32 suitable for continuous operation?
Yes. The AI-32 is designed for reliable 24×7 operation in HVAC, commercial, industrial, pharmaceutical, and healthcare applications. It provides dependable long-term performance with minimal maintenance.
13. Does the pressure switch require calibration?
The AI-32 is factory calibrated before shipment. Periodic inspection and functional testing are recommended during routine HVAC maintenance to verify correct switching performance.
14. Is installation easy?
Yes. The AI-32 features a compact wall-mounted design with hose connections for the high-pressure and low-pressure ports. It can be installed quickly on new HVAC systems or retrofitted into existing installations using standard pressure tubing.
15. What are the advantages of using the AI-32?
Key benefits include:
- Reliable differential pressure switching
- Adjustable pressure setpoint
- No external power required for sensing
- Simple ON/OFF control
- Suitable for filter monitoring and cleanroom applications
- Easy installation
- Low maintenance
- Rugged industrial construction
16. Who typically uses the AI-32?
The AI-32 is widely used by:
- HVAC contractors
- Facility managers
- Building automation integrators
- Pharmaceutical manufacturers
- Hospital engineering departments
- Cleanroom operators
- Industrial maintenance engineers
- Laboratory managers
- Mechanical consultants
17. Which differential pressure switches can the AI-32 be used as a cross-reference for?
The AI-32 Differential Pressure Switch is suitable for applications with pressure ranges and switching characteristics similar to many commonly used differential pressure switches, including:
- Siemens QBM81 series (QBM81-3, QBM81-5, QBM81-10, QBM81-20)
- Dwyer ® 1910/1900 Series (1910-0, 1910-2, 1910-1, 1910-5, 1910-10, 1910-20)
- Johnson Controls P233A Series (P233A-4, P233A-10)
- Honeywell EDPS Series
- Honeywell DPS Series (DPS200, DPS400, DPS500, DPS1000, DPS2500)
Disclaimer : The comparisons above are cross-reference groupings based on overlapping pressure ranges and switching specifications. They are not direct or certified equivalence claims. Ace Instruments is an independent manufacturer and is not affiliated with, endorsed by Siemens, Dwyer ® Instruments, Johnson Controls, or Honeywell. Model numbers from those brands are used here purely for range-matching reference, not as interchangeability guarantees.
18. Why choose ACE Instruments?
ACE Instruments has over 30 years of experience in manufacturing pressure monitoring and HVAC instrumentation. Customers choose our products for their reliable performance, industrial-grade construction, ease of installation, responsive technical support, and proven performance in commercial, healthcare, pharmaceutical, and industrial applications.
19. How do I choose the right Differential Pressure Switch?
Choosing the right AI-32 depends on your application, operating pressure range, switching setpoint, process conditions, and installation requirements. Our application engineers can help you select the most suitable model for filter monitoring, cleanroom pressure control, ventilation systems, or industrial process applications.
