RETIRED ›
This product is no longer available and has been replaced by: EE181. Some accessories, replacement parts, or services may still be available.
HMP45C-LQ Temperature and Relative Humidity Probe
Services Available
Repair No
Calibration No
Free Support No

Overview

The HMP45C-LQ is a rugged, accurate temperature and relative humidity probe. The sensor measures relative humidity over the 0 to 100% RH range and temperature over the -40° to +60°C range.

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Benefits and Features

  • Well-suited for long-term, unattended applications
  • Accurate and rugged
  • Configured for use with the RAWS-P Fire Weather Station

Technical Description

For this version of the HMP45C, the cable terminates in a military style connector and has a user-specified lead length. The connector attaches to the RAWS-P enclosure, which mounts to a CM6/CM10 tripod, CM110-series tripod, or UT-series tower. The probe uses a HUMICAP capacitive polymer H chip to measure relative humidity over the 0 to 100% RH range. A PRT measures temperature over the -40° to +60°C range.

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Specifications

  • Supply Voltage: 12 Vdc nominal (typically powered by datalogger)
  • Current Consumption: ≤4 mA (active)

Relative Humidity

  • Sensor: Vaisala’s HUMICAP® H-chip
  • Measurement Range: 0.8% to 100% RH, non-condensing
  • Output Signal Range: 0.008 to 1 Vdc
  • Accuracy at 20°C:
    • Against Factory Reference: ±1% RH
    • Field-Calibrated Against References: ±2% (0% to 90% range);
      ±3% (90% to 100% range)
  • Temperature Dependence: ±0.05% RH/°C
  • Long-Term Stability: Typically, better than 1% RH per year
  • Response Time: 15 seconds with membrane filter (at 20°C, 90% response)
  • Settling Time: 500 milliseconds

Temperature

  • Temperature Sensor: 1000 ohm Platinum Resistance Thermometer
  • Measurement Range: -39.2° to +60°C
  • Output Signal Range: 0.008 to 1.0 V
  • Accuracy: see graph in HMP45C product brochure

Compatibility

The sensor cable terminates in a military style connector and a user-specified lead length. The connector attaches to the RAWS-P enclosure.

Mounting

The HMP45C-LQ should be housed in a 41003-5 10-plate naturally-aspirated solar radiation shield. This radiation shield mounts to a tripod or tower mast, crossarm, or user-supplied pole.

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