SN1120-A50 - ebm-papst, 50Pa pressure sensor

The ebm-papst SN1120-A050 is a differential pressure sensor with a 0–50Pa measurement range, designed for monitoring air pressure differences in HVAC and building services applications. It uses a high-quality mass flow module to convert pressure differential into a linear 0–10VDC analogue output signal, making it directly compatible with most HVAC controllers and BMS inputs without signal conditioning.

The sensor features reverse polarity protection, no offset, no zero-point drift, and is hysteresis-free throughout its operating range. Full factory calibration and temperature compensation from -20°C to +80°C is applied for air and N2. Supplied with two 0.5m air hoses fitted as standard.

Key Specifications

• Part number: SN1120-A050
• Pressure range: 0–50 Pa
• Output signal: 0–10 VDC (analogue)
• Supply voltage: 9.5–57 V (nominal)
• Max current: 10 mA
• Operating temperature: -20°C to +80°C
• Ingress protection: IP54
• Dimensions (W × L × H): 43.2 × 90.2 × 69.4 mm
• Weight: 86 g
• Cable length: 1 m (nominal)
• Media: Clean air and non-aggressive gases

How the Output Works

The 0–10VDC output is proportional to the pressure differential relative to the sensor's full range. At 50Pa (full scale on the A050), the output is 10V. A differential of 25Pa gives 5V. This linear relationship makes the SN1120-A050 straightforward to configure in any controller or datalogger with a standard analogue input.

Typical Applications

• Filter condition monitoring in air handling units (AHUs)
• Duct static pressure measurement and control
• Fan speed control and proof-of-flow detection
• Clean room and laboratory differential pressure monitoring
• VAV system pressure feedback

SN1120 Series & Other Pressure Ranges

The SN1120 is available in four analogue variants. All share the same physical format, supply voltage, and output signal:

• SN1120-A050: 0–50 Pa (Analogue)
• SN1120-A100: 0–100 Pa (Analogue)
• SN1120-A200: 0–200 Pa (Analogue)
• SN1120-A500: 0–500 Pa (Analogue)