This product is no longer available and has been replaced by: EE181.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


The HMP45C-LC 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.

Lesen Sie mehr

Funktionen und Vorteile

  • Gut geeignet für lange, wartungsfreie Messungen
  • Akkurat und robust
  • Konfiguriert zur Verwendung mit der MetData1-Wetterstation oder dem CS110 Elektrisches Feldmeter


Technische Beschreibung

This version of the HMP45C has a connector instead of pigtails for connecting the sensor to a MetData1 Weather Station or CS110 Electric Field Meter. The probe uses a HUMICAP capacitive polymer H chip to measure relative humidity, and a PRT to measure temperature. Relative humidity range is 0 to 100% RH, and temperature range is -40° to +60°C. A solar radiation shield is required if the probe will be exposed to sunlight.


  • 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 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

Kompatibel mit

The connector can be attached to the CS110 Electric Field Meter or MetData1 Weather Station. The CS110 has a CR1000 and the MetData1 has an on-board CR10X.


The HMP45C-LC 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.