HMP155A

Air Temperature and Relative Humidity Sensor
HMP155A

HMP155A

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Air Temperature and Relative Humidity Sensor

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Model:
HMP155A
Item Number:
45187
Warranty:
1 year

Overview

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.

Key Advantages

Accurate, Wide Temp Range
Higher-end sensor where higher accuracy is required

Technical Description

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.

Product Notes

requires solar radiation shield for air temp

Benefits

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

Specifications

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.

Common Accessories

(4)

Ships With

(4)

Similar Products

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Compatibility

Sensor Mounts

When exposed to sunlight, the HMP155A must be housed in a 41005-5 or RAD14 14-plate naturally aspirated radiation shield. The 41005-5 and RAD14 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3 cm (1.0 to 2.1 in.) outer diameter. The RAD14 uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion, It also has lower self-heating in bright sunlight combined with higher temperatures (> 24°C [~75°F])
and low wind speeds (< 2 m s-1 [~4.5 mph]), giving a better measurement.

Compatible Products

(3)

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