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HMP155ATemperature and Relative Humidity Probe

The HMP155A can be powered continuously or the power may be switched to

conserve battery life. The HMP155A consumes less than 3 milliamps current

at 12 Vdc. Approximately 2 seconds is required for the sensor to warm up

after power is switched on. At measurement rates slower than once per 5

seconds, the overall power consumption (datalogger and sensors) may be

reduced by switching power to the HMP155A. Most current Campbell

Scientific dataloggers have a built-in switched 12 Vdc that can be used to

control power. The CR9000 and many Edlog dataloggers do not have a built-in

switched and require the SW12 to switch power (see at

www.campbellsci.com/old-manuals or contact a Campbell Scientific

application engineer for more information).

HMP155 sensors purchased directly from Vaisala with serial

numbers < E4430001 require approximately 5 seconds warm up

time.

The -L option on the model HMP155A Temperature and Relative Humidity

probe (HMP155A-L) indicates that the cable length is user specified. TABLE

5-1 gives the recommended lead length. Add 2 ft to the cable length if the

enclosure is mounted to the leg base of a CM106B, CM110, CM115, or

CM120 tripod.

TABLE 5-1. Recommended Lead Lengths

2 m Height Atop a tripod or tower via a 2 ft crossarm

Mast/Leg CM202 CM106B CM110 CM115 CM120 UT10 UT20 UT30

9 ft 11 ft 14 ft 14 ft 19 ft 24 ft 14 ft 24 ft 37 ft

The probe’s cable can terminate in:

• Pigtails that connect directly to a Campbell Scientific datalogger

(option –PT).

• Connector that attaches to a prewired enclosure (option –PW). Refer

to www.campbellsci.com/prewired-enclosures for more information.

6. Specifications

Features:

• Well-suited for long-term, unattended applications

• Accurate and rugged

• Compatible with Campbell Scientific CRBasic dataloggers:

CR200(X) series, CR800 series, CR1000, CR3000, CR5000, and

CR9000(X).

Operating temperature range

for humidity measurement: –80 to 60 °C (–112 to 140 °F)

Storage temperature range: –80° to 60 °C (–112 to 140 °F)

NOTE

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Campbell HMP 35A Bedienerhandbuch Seite 16