HMP45C-L

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Ideal for long-term, unattended applications

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This product is no longer available and has been replaced by: HC2S3-L. Some accessories, replacement parts, or services may still be available.

Technical Description

The HMP45C probe uses a HUMICAP capacitive polymer H chip to measure relative humidity and a PRT to measure temperature. Yearly HMP45C recalibrations are recommended.

To reduce the current drain, power can be supplied to the HMP45C 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.

HMP45C-L Specifications

Supply Voltage: 12 Vdc nominal (typically powered by datalogger)
Current Drain: ≤4 mA (active)
Sensor Diameter: 2.5 cm (1 in.)
Sensor Length: 25.4 cm (10 in.)
Cable Diameter: 0.8 cm (0.3 in.)
Weight: 0.27 kg (0.6 lb)

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
Accuracy at 20°C (field-calibrated against references):
±2% (0% to 90% RH);
±3% (90% to 100% RH)
Temperature Dependence: ±0.05% RH/°C
Long-Term Stability: Typically, better than 1% RH per year
Response Time: 15 s with membrane filter (at 20°C, 90% response)
Settling Time: 500 ms

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:
±0.5°C (-40°C),
±0.4°C (-20°C),
±0.3°C (0°C),
±0.2°C (20°C),
±0.3°C (40°C),
±0.4°C (60°C)