QBM3230U03UD Siemens Air DP Sensor (S55720-S522)
$154.01
QBM3230U03UD – Air DP Sensor, -0.3″ to +0.3″, Selectable Range/Output, Display (S55720-S522)
Siemens QBM3230U03UD Air Differential Pressure Sensor (S55720-S522)
Overview
The Siemens QBM3230U03UD is a precision air differential pressure (DP) sensor engineered for HVAC, VAV, duct, and clean-room applications. Featuring a selectable measuring range of −0.3 to +0.3 inches water column, output options including 0-10V, 0-5V, or 4-20mA, and a built-in LCD display, it delivers both flexibility and accuracy. With a rugged construction, it supports plastic tubing connections and screw-terminal electrical hookup, making installation and configuration easy and reliable.
Differential air pressure sensor for use in HVAC systems. Measuring range is selectable between -0.3″ and + 0.3″ bidirectional. Output is selectable for 0-10V, 0-5V or 4-20mA. Includes LCD display.
Key Features & Benefits
Selectable Measuring Ranges: −0.3″ to +0.3″ WC (also configurable to smaller spans) to suit various low-pressure applications. Siemens Smart Delivery+1
Multiple Output Signals: Choose 4-20mA or 0-10V/0-5V depending on your control system input. Apex Controls+1
Built-In LCD Display: Provides immediate readout for easier setup, calibration, and diagnostics. Apex Controls
Compact & Robust: Measures about 3.25 × 2.95 × 1.93 in, with reliable tubing connections and screw terminals for durable performance. Apex Controls
Low-Voltage Operation: Works with 13.5-33 VDC, suitable for many modern HVAC control systems. Apex Controls+1
Technical Specifications
| Specification | Detail |
|---|---|
| Brand / Model | Siemens QBM3230U03UD (S55720-S522) (Siemens HIT) |
| Measuring Range | −0.3″ to +0.3″ WC (also −0.2, −0.1) (Siemens Smart Delivery) |
| Output Types | 0-10V / 0-5V / 4-20mA analog; 2-wire or 3-wire configuration (Siemens Smart Delivery) |
| Voltage Supply | 13.5-33 VDC (Apex Controls) |
| Electrical Connection | Screw terminals (Apex Controls) |
| Pressure Connection | ¼-inch plastic tubing (push-on) (Apex Controls) |
| Display | LCD display for real-time differential pressure reading (Apex Controls) |
| Dimensions (W × H × D) | ~3.25 × 2.95 × 1.93 in (Apex Controls) |
| Typical Applications | HVAC ducts, filter/air handler fan control, clean rooms, VAV systems, labs, environmental control (Siemens Smart Delivery) |
Applications & Use Cases
This sensor is ideal for:
Monitoring differential air pressure across filters in heating, ventilating, and air-conditioning (HVAC) systems.
Balancing air flow in VAV (Variable Air Volume) or fan-powered terminals.
Maintaining clean room or lab environmental conditions by supervising pressure stability.
Demand control ventilation and energy-saving control strategies.
Installation & Best Practices
- Mount the sensor with pressure connection nipples facing downward to prevent condensation buildup. Apex Controls
- Use push-on plastic tubing (¼-in) with secure fittings.
- Ensure stable supply voltage within specified range (13.5-33 VDC) for proper output.
- Use LCD for initial calibration, zero adjustment, and verifying operation.
- Location should avoid exposure to corrosive or aggressive gases (sensor is for “air and non-aggressive gases”). Siemens Smart Delivery+1
Why Buy From Apex Controls
We provide the genuine Siemens QBM3230U03UD unit with full spec sheet and support.
Fast shipping, dependable stock, and OEM guarantee.
Trusted supplier of sensors and building controls since 1990.
| Weight | 2 lbs |
|---|---|
| Dimensions | 4 × 3 × 2 in |
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