U23-004 HOBO Data Logger (2 channels) Temp. Int./Ext.

The HOBO Pro v2 Data Logger Temperature/External Temperature data logger is a weatherproof data logger with an external soil/water temperature sensor on a 6-foot cable useful for situations where just one temperature probe is required. An internal temperature sensor is also included.

Features:

• Weatherproof housing for use in outdoor or condensing environments
• High accuracy
• Replaceable Relative Humidity sensor provides fast response and superior recovery from condensing conditions
• Small-diameter external sensor versions for measurements in tight spaces
• Optic USB interface for fast and reliable download

Temperature Sensor
Operation range:
Internal sensors: -40° to 70°C (-40° to 158°F)
External sensors: -40° to 100°C (-40° to 212°F), with tip and cable immersion in fresh water up to 50°C (122°F) for one year
Accuracy: 0.2°C over 0° to 50°C (0.36°F over 32° to 122°F); see Plot A
Resolution: 0.02°C at 25°C (0.04°F at 77°F); see Plot A
Response time: (typical to 90%)
Internal sensors: 40 minutes in air moving 1 m/sec
External sensors: 3 minutes in air moving 1 m/sec; 30 seconds in stirred water
Stability (drift): < 0.1°C (0.18°F) per year

Logger
Operation range: -40° to 70°C (-40° to 158°F)
Real-time clock: ± 1 minute per month 0° to 50°C (32° to 122°F)
Battery: 1/2 AA, 3.6 Volt lithium, user-replaceable (part # HP-B)
Battery life (typical use): 3 years with 1 minute or greater logging interval
Memory (non-volatile): 64K bytes memory (approx. 21,000 temperature and RH measurements)
Materials: ASA styrene polymer housing and mounting clamp; polypropylene protective cap; Buna-N o-ring(s)
Cables: One 184 cm (6 ft.) PVC cable; sensor diameter 0.5 cm (0.20 in.)
Environmental rating: Electronics housing is NEMA 6P equivalent (tolerant of brief submergence)
Units with RH sensors are NEMA 4 equivalent (splash-resistant)
Launch modes: Immediate start; delayed start
Logging interval: Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours (refer to HOBOware software manual)
Offload modes: Offload while logging; stop and offload
Battery indication: Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
Weight: 102 g (2.7 oz)
Dimensions: Housing measures 10.2 × 3.8 cm (4.0 × 1.5 in.)

NIST certificate Temperature certificate available for additional charge