HMP155A-L Temperature & Relative Humidity Probe
HMP155A-L Temperature & Relative Humidity Probe
HMP155A-L Temperature & Relative Humidity Probe HMP155A-L Temperature & Relative Humidity Probe
HMP155A-L Temperature & Relative Humidity Probe
Campbell Scientific
Environment , Weather Station & Sensors

To reduce the current drain, power can be supplied to the HMP155A only during measurement when the sensor is connected to the data logger’s switched 12 V terminal. Data loggers that do not have a switched 12 V terminal, such as the CR510 or CR7, can use the SW12V switched 12 V device to switch power to the sensor only during measurement.

Benefits and Features

  • Well-suited for long-term, unattended applications
  • Accurate and rugged
  • Mounts to a mast, cross-arm, or user-supplied pole
  • Compatible with most Campbell Scientific data loggers

The HMP155A provides reliable relative humidity (RH) and temperature measurements for a wide range of applications. It uses a HUMICAP®180R capacitive thin film polymer sensor to measure RH over the 0 to 100% RH range. A PRT measures temperature over the -80° to +60°C range. This rugged, accurate temperature/RH probe is manufactured by Vaisala.

  • An air temperature and relative humidity (RH) sensor that provides reliable measurements for a wide range of applications.
  • Can be used as part of a weather station system or as a single instrument.
  • Replaces the HMP45C, which is still available but will be retired in late 2010.
  • Uses the 41005-5 radiation shield, which is different from the one used by the HMP45C.
Electromagnetic Compatibility Complies with EMC standard EN61326-1 Electromagnetic
Filter Description Sintered PTFE
Housing Body Material PC
Housing Classification IP66
Voltage Output 0 to 1 Vdc
Average Current Consumption ≤ 3 mA (analog output mode)
Operating Voltage 7 to 28 Vdc
Settling Time 2 s (at power up)
Field-Replaceable Chip or Recalibrate Recalibrate
Tip Diameter 1.2 cm (0.5 in.)
Length 27.9 cm (11 in.)
Head Height 4 cm (1.6 in.)
Body Height 2.4 cm (0.9 in.)
Body Width 2.0 cm (0.8 in.)

Relative Humidity
Sensing Element HUMICAP 180R
Measurement Range 0 to 100% RH (non-condensing)
Response Time
  • The response time for the RH specification is for the HUMICAP 180R at 20°C in still air with sintered PTFE filter and a 0 to 75% RH step change.
  • 20 s (63% step change)
  • 60 s (90% step change)
Factory Calibration Uncertainty
  • The factory calibration uncertainty is defined as ±2 standard deviation limits. Uncertainty is at +20°C. Small variations are possible; see also the calibration certificate.
  • ±0.6% RH 0 to 40% RH
  • ±1.0% RH 40 to 97% RH
Accuracy
  • -NOTE- Accuracy specifications include non-linearity, hysteresis, and repeatability.
  • ±1% RH (at 15° to 25°C, 0 to 90% RH)
  • ±1.7% RH (at 15° to 25°C, 90 to 100% RH)
  • ±(1.4 + 0.032 × reading) % RH (at -60° to -40°C)
  • ±(1.2 + 0.012 × reading) % RH (at -40° to -20°C)
  • ±(1.0 + 0.008 × reading) % RH (at -20° to +40°C)
  • ± (1.2 + 0.012 × reading) % RH (at 40° to 60°C)

Air Temperature
Sensing Element PT 100 RTD 1/3 class B IEC 751
Measurement Range -80° to +60°C
Accuracy
  • ±(0.226 - 0.0028 x temperature)°C (-80° to +20°C)
  • ±(0.055 + 0.0057 x temperature)°C (+20° to +60°C)
Entire Temperature Range Refer to graph in probe manual.
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