HC2-LDP-EX Low Dew Point Probe

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The low dew point probe comes with the latest AirChip4000 technology. Calculates a measurement from the average of 8,000 single points within a 2 second interval and, together with the HYGROMER® LDP-1 dew point sensor, delivers measurements of the highest quality.

Field of Application

The low dew point probe can be used in compressed air systems, refrigeration dryers and adsorption dryers. ROTRONIC offers the probe with EX certificate for environments with ATEX requirements.


  • Suitable measurement chambers with a defined air flow rate and a quick connector for optimum dew point measurement are available in POM and stainless steel. The base unit can be used for customization.
  • Highly accurate dew point and temperature measurement
  • Withstands pressures up to 100 bar
  • HYGROMER® LDP-1 sensor element
  • Excellent repeatability
  • Trace moisture monitoring at low limits
  • With the latest AirChip4000 measurement technology
  • Compatible with HF5 / HF8 / PF4 transmitters and HP22 / HP23 handhelds
Probe type Digital dew point & temperature
Dimensions 145 x 140 mm (probe head)
Hexagonal nut: 3 x 140 mm
Weight 260 g
Measuring range -70…85 °C Td / -40...85 °C
Dew point accuracy at 23°C ±2 K Td (-50…20 °C Td)
±3.5 K Td (-60…-50 °C Td)
Temperature accuracy @ 23°C ±0.2 K
Dew point sensor HYGROMER® LDP-1
Long-term sensor stability dew point sensor <1 °C Td/year
Response time dew point sensor Ƭ63: @ -50 °C Td Typically <10 min, with filter
Response time temperature sensor Ƭ63: @ -50 °C Td Typically <15 min, with filter
Pressure resistance 16 bar
100 bar (with LDP-MCS measurement chamber)
Power supply / Power consumption 3.3…5 VDC / 1.5 mA
Temperature sensor Pt1000, Class B 1/3
Filter cartridge Sintered stainless steel, 50 μm
Measurement interval 2 seconds
Communication interfaces UART
Housing Stainless steel 1.4301
IP protection rating IP65
FDA/GAMP compatibility Yes
CE / EMC conform 2004/108/EC
Maintenance Annual calibration (recommended)
Storage and transport conditions -40…85 °C, non-condensing

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