HMP45C-L
HMP45C-L
End of lifeConfigurableTemperature and Relative Humidity Probe
Pricing
Pricing temporarily unavailable.
- Model:
- HMP45C-L
- Item Number:
- HMP45C-L
- Warranty:
- 1 year
- Lead time:
- 21 days
- Compliance:
- requires 41003-5A radiation shield
Overview
The HMP45C is a rugged, accurate temperature and relative humidity probe. It measures relative humidity over the range of 0 to 100% RH and temperature over the range of -40° to +60°C. This probe is suitable for long-term, unattended monitoring, and is compatible with all Campbell Scientific data loggers.
Key Advantages
Ideal for long-term, unattended applications
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 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.
Benefits
- Well-suited for long-term, unattended applications
- Accurate and rugged
- Mounts to a tripod or tower mast, crossarm, or user-supplied pole
- 13367 Sensor Head available to facilitate recalibration
- Compatible with most Campbell Scientific data loggers
Specifications
- Supply Voltage
- 12 Vdc nominal
(typically powered by data logger)
- Current Drain
- ≤ 4 mA
(active)
- Cable Diameter
- 0.8 cm
(0.3 in.)
- Sensor Diameter
- 2.5 cm
(1 in.)
- Sensor Length
- 25.4 cm
(10 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)
- Accuracy at 20°C (field-calibrated against references)
- ±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 at -40°C
- ±0.5°C
- Accuracy at -20°C
- ±0.4°C
- Accuracy at 0°C
- ±0.3°C
- Accuracy at 20°C
- ±0.2°C
- Accuracy at 40°C
- ±0.3°C
- Accuracy at 60°C
- ±0.4°C