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LDE Low Pressure Sensor for High Immunity to Dust and Humidity

LDE Low Pressure Sensor for High Immunity to Dust and Humidity

The LDE differential low pressure sensors are designed with thermal flow measurement of gas through a micro-flow channel integrated within the sensor chip. The advanced LDE technology features outstanding sensitivity especially for ultra-low pressures. The very low gas flow through the sensor ensures high immunity to humidity, dust contamination, and long tubing compared to other flow-based pressure sensors. Small SMT and DIP housings allow for space-saving PCB-mounting.

Typical applications of the LDE differential low pressure sensors include HVAC, medical devices, and instrumentation.

Technical specifications

   
Pressure ranges Differential/Gage: 0...25 to 0...500 Pa
Differential (Pressure/Vacuum): 0...±25 to 0...±500 Pa
Output signal SPI, 0.3...2.7 V, 0.5...4.5 V
Pressure connection tube fitting (Ø 2 mm)
Size without nipples and pins (approx.) 13 x 18 x 8 mm

 

Features

  • Pressure sensor based on thermal micro-flow measurement
  • Pressure ranges from 25 to 500 Pa (0.1 to 2 in H2O)
  • High flow impedance
    • high immunity to dust and humidity
    • very low flow-through leakage
    • no loss in sensitivity using long tubing
  • Calibrated and temperature compensated
  • On-chip temperature sensor
  • Unique offset auto-zeroing feature ensuring superb long-term stability
  • Offset accuracy better than 0.2 % FS
  • RoHS and REACH compliant
  • Analog output and digital SPI interface
  • Total accuracy better than 0.5 % FS typical
  • Quality Management System according to EN ISO 13485 and EN ISO 9001

Media Compatibility

Air and other non-corrosive gases

Specifications

Maximum ratings

.
Supply voltage VS
    LDE...3...
    LDE...6...

2.70 ... 3.60 VDC
4.75 ... 5.25 VDC
Output current 1 mA
Lead specifications
    Average preheating temperature gradient
    Soak time
    Time above 217 °C
    Time above 230 °C
    Time above 250 °C
    Peak temperature
    Cooling temperature gradient

2.5 K/s
ca. 3 min
50 s
40 s
15 s
260 °C
-3.5 K/s
Temperature ranges
    Compensated
    Operating
    Storage

0 ... +70 °C
-20 ... +80 °C
-40 ... +80 °C
Humidity limits (non-condensing) 97 %RH
Vibration1 20 g
Mechanical shock2 500 g

 

Electrical Connection3

Specification notes:
1. Sweep 20 to 2000 Hz, 8 min, 4 cycles per axis, MIL-STD-883, Method 2007.
2. 5 shocks, 3 axes, MIL-STD-883E, Method 2002.4.
3. The maximum voltage applied to pin 1 and pins 6 through 10 should not exceed VS+0.3 V.

Video: LDE/LME/LMI ultra-low pressure sensors for medical and HVAC applications

Video: LDE/LME/LMI ultra-low differential pressure sensors offer high sensitivity

Video: LDE/LME/LMI ultra-low differential pressure sensors offer high immunity to dust and humidity

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