Posted in | Pressure Sensors

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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