Vaisala HUMICAP HMP41 Spécifications télécharger pdf (Page 5)

Model 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 -L option on the model HMP45C Temperature and Relative Humidity

probe (HMP45C-L) indicates that the cable length is user specified. This

manual refers to the sensor as the HMP45C.

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 SW12V to switch power.

Prior to April 2004, the HMP45C included a power switching

circuit in the cable. The in-cable switching circuit was

discontinued because in most cases it is no longer necessary and

it made the cable difficult to route through the entry port on

environmental enclosures.

NOTE

Lead length for the HMP45C is specified when the sensor is ordered. Table

1-1 gives the recommended lead lengths.

TABLE 1-1. Recommended Lead Lengths

2 m Height Atop a tripod or tower via a 2 ft crossarm such as the CM202

Mast/Leg CM202 CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30

9' 11' 11' 14' 14' 19' 24' 14' 24' 37'

Note: Add two feet to the cable length if you are mounting the enclosure on the leg base of a light-weight tripod.

The HMP45C ships with:

(1) Adjustment Screwdriver from mfg

(1) Calibration Sheet

(1) Resource CD

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