Campbell HMP 35A Manuál s instrukcemi stáhnout pdf (Strana 16)

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 Manuál s instrukcemi Strana 16