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HMP45C Temperature and Relative

Humidity Probe

1. General Description

The HMP45C Temperature and Relative Humidity probe contains a Platinum

Resistance Temperature detector (PRT) and a Vaisala HUMICAP

180

capacitive relative humidity sensor.

The HMP45C can be powered continuously or the power may be switched to

conserve battery life. The HMP45C consumes less than 4 milliamperes current

at 12 volts. Approximately 0.15 seconds is required for the sensor to warm up

after power is switched on. At measurement rates slower than once per second,

the overall power consumption (datalogger and sensors) may be reduced by

switching power to the HMP45C. Most current Campbell Scientific dataloggers

have a built-in switched 12 volts that can be used to control power.

The CR9000, CR510, CR500, CR7, CR10 and 21X dataloggers do not have a

built-in switched 12 volts. Users with these dataloggers can power the sensor

continuously or purchase the model PSW12 to switch power.

2. Specifications

Operating Temperature: -40°C to +60°C

Storage Temperature: -40°C to +80°C

Probe Length: 25.4 cm (10 in.)

Probe Body Diameter: 2.5 cm (1 in.)

Filter: 0.2 μm Teflon membrane

Filter Diameter: 1.9 cm (0.75 in.)

Power Consumption: <4 mA @ 12 V

Supply Voltage: 7 to 35 VDC

Settling Time: 0.15 seconds

The HMP45C ships with:

(1) Adjustment Screwdriver from mfg

(1) Calibration Sheet

(1) Instruction Manual

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Campbell HMP45C Guia do Utilizador Página 9