HMP155A-L Temperature and Relative Humidity Probe
Accurate, Wide Temp Range
Higher-end sensor where higher accuracy is required
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications

Overview

The HMP155A, manufactured by Vaisala, monitors relative humidity (RH) for the range of 0 to 100% RH and temperature for the range of -80° to +60°C. It can provide reliable measurements for a wide range of applications, as part of a weather station system or as a single instrument. All Campbell Scientific dataloggers are compatible.

Read More

Benefits and Features

  • Well-suited for long-term, unattended applications
  • Accurate and rugged
  • Mounts to a tripod or tower mast, crossarm, or user-supplied pole
  • Compatible with all Campbell Scientific dataloggers

The "-L" on a product model indicates that the cable length is specified at the time of order.

Images

Detailed Description

The HMP155A uses a HUMICAP180R capacitive thin film polymer sensor to measure RH, and a PRT to measure temperature. 

To reduce the current drain, power can be supplied to the HMP155A only during measurement when the sensor is connected to the datalogger’s switched 12 V terminal. Dataloggers 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.

Specifications

Electromagnetic Compatibility Complies with EMC standard EN61326-1 Electromagnetic
Filter Description Sintered PTFE
Housing 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)
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

Sensor HUMICAP 180R
Measurement Range 0.8 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
-NOTE- Accuracy specifications include non-linearity, hysteresis, and repeatability.
Accuracy at 15° to 25°C
  • ±1% RH (0 to 90% RH)
  • ±1.7% RH (90 to 100% RH)
Accuracy at -60° to -40°C ±(1.4 + 0.032 × reading) % RH
Accuracy at -40° to -20°C ±(1.2 + 0.012 × reading) % RH
Accuracy at -20° to +40°C ±(1.0 + 0.008 × reading) % RH
Accuracy at 40° to 60°C ± (1.2 + 0.012 × reading) % RH

Air Temperature

Sensor Pt 100 RTD 1/3 class B IEC 751
Measurement Range -80° to +60°C
Accuracy with Voltage Output
  • ±(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.

Compatibility

Sensor Mounts

The 41005-5 14-plate Radiation Shield should be used when the HMP155A is exposed to sunlight. The 41005-5 can attach directly to a mast or tower leg or to a CM202, CM204, or CM206 crossarm.

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR6

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Frequently Asked Questions

Number of FAQs related to HMP155A-L: 7

Expand AllCollapse All

  1. The maximum cable length is 304 m (1000 ft).

  2. Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:

    • An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
    • An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.

    If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.

    If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.

    • –ET models terminate with the connector for an ET107 weather station.
    • –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
    • –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
    • –PW models terminate with the connector for a PWENC or pre-wired system.
  3. Not every sensor has different cable termination options. The options available for a particular sensor can be checked by looking in two places in the Ordering information area of the sensor product page:

    • Model number
    • Cable Termination Options list

    If a sensor is offered in an –ET, –ETM, –LC, –LQ, or –QD version, that option’s availability is reflected in the sensor model number. For example, the 034B is offered as the 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, and 034B-QD.

    All of the other cable termination options, if available, are listed on the Ordering information area of the sensor product page under “Cable Termination Options.” For example, the 034B-L Wind Set is offered with the –CWS, –PT, and –PW options, as shown in the Ordering information area of the 034B-L product page.

    Note: As newer products are added to our inventory, typically, we will list multiple cable termination options under a single sensor model rather than creating multiple model numbers. For example, the HC2S3-L has a –C cable termination option for connecting it to a CS110 instead of offering an HC2S3-LC model. 

  4. Note the difference between calibration and a field check. Calibration cannot be done in the field, as it requires an experienced technician and specialized equipment.

    Field checks of measurements can be done to determine if the data make sense with the real-world conditions. Follow these steps to field check a sensor:

    1. Find a second sensor of the same type as the installed sensor whose data is in question. The second sensor will be used as a benchmark sensor and should be known to be accurate or recently calibrated.
    2. At the site, take readings using both sensors under the same conditions. The best practice is to measure both sensors side-by-side at the same time. Note that the sensors will never have the exact same measurement.
    3. Depending on the sensor model, if the difference in the readings of the installed and benchmark sensors is greater than the sum of the accuracies for both sensors, either return the installed sensor to Campbell Scientific for calibration or replace the appropriate chip.
      • The 107, 108, 109, 110PV-L, and BlackGlobe-L temperature sensors can be calibrated.
      • The HC2S3-L and HMP155A-L temperature and relative humidity sensors can be calibrated.
      • The CS215-L has a replaceable chip for temperature and relative humidity. For more information, refer to the “Maintenance and Calibration” section of the CS215 instruction manual.
      • The HMP60-L has a replaceable chip for relative humidity only. For more information, refer to the “Maintenance” section of the HMP60 instruction manual.
  5. Many Campbell Scientific sensors are available with different cable termination options. These options include the following:

    • The –PT (–PT w/Tinned Wires) option is the default option and does not display on the product line as the other options do. The cable terminates in pigtails that connect directly to a datalogger.
    • In the –C (–C w/ET/CS110 Connector) option, the cable terminates in a connector that attaches to a CS110 Electric Field Meter or an ET-series weather station.
    • In the –CWS (–CWS w/CWS900 Connector) option, the cable terminates in a connector that attaches to a CWS900-series interface. Connection to a CWS900-series interface allows the sensor to be used in a wireless sensor network.
    • In the –PW (–PW w/Pre-Wire Connector) option, the cable terminates in a connector that attaches to a prewired enclosure.
    • In the –RQ (–RQ w/RAWS Connector) option, the cable terminates in a connector that attaches to a RAWS-P Permanent Remote Automated Weather Station.

    Note: The availability of cable termination options varies by sensor. For example, sensors may have none, two, or several options to choose from. If a desired option is not listed for a specific sensor, contact Campbell Scientific for assistance.

  6. Single-ended channels are typically used when it is desirable to use fewer channels and the cable length is shorter—less than 6.1 m (20 ft). Differential channels are preferable when the cable needs to be longer than 6.1 m (20 ft).