Campbell Scientific HMP155A HMP155A Temperature and Relative Humidity Probe - Page 16

HMP155ATemperature and Relative Humidity Probe current at 12 volts. 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 volts that can be used to control power. NOTE HMP155 sensors purchased directly from Vaisala with serial numbers < E4430001 require approximately 5 seconds warm up time. The CR9000, CR510, CR500, CR7, CR10, and 21X dataloggers do not have a built-in switched 12 V. Users with these dataloggers can power the sensor continuously or purchase the model SW12V to switch power. 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 Mast/Leg CM202 9 ft 11 ft CM106B 14 ft Atop a tripod or tower via a 2 ft crossarm CM110 CM115 CM120 UT10 UT20 14 ft 19 ft 24 ft 14 ft 24 ft UT30 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). Also compatible with Edlog dataloggers: CR500, CR510, CR10(X), CR23X, 21X, and CR7 Operating temperature range for humidity measurement: Storage temperature range: Electromagnetic compatibility: -80° to +60°C -112° to +140°F) -80° to +60°C -112° to +140°F) Complies with EMC standard EN61326-1, Electrical equipment for measurement 8