Onset HOBO Data Logger Recording Events, Pulses and Temperature
The Pendant Event/Temp Data Logger is a rugged,
weatherproof event logger with a 10-bit temperature sensor. It
is ideal for use with tipping-bucket rain gauges, and can record
tens of thousands of measurements and events. The logger features a 2-wire interface cable for measuring mechanical and electrical contact closures, user-replaceable battery and a 1.5 meter drop specification.
Two-wire interface suitable for measuring mechanical and electrical
contact closures
Maximum Input Frequency
1 Hz (1 pulse per second)
Lockout Time
500 ms
Lockout eliminates false readings from tipping-bucket bounce
Minimum Pulse Width
1 ms (Hardware DeBounce)
Input/Output Impedance
100 kΩ
Edge Detection
Falling edge, contact closure, or Schmitt-trigger Buffer
Preferred Switch Type
Normally open. For maximum battery life, the event input should be
used with its preferred switch type. The
logger will work with normally closed switches, but battery
life will be compromised.
Open Circuit Input Voltage
Battery Voltage; Nominally 3.0 Volts
Maximum Input Voltage
Battery Voltage + 0.3 Volts
User Connection
24 AWG, 2 leads: White (+), Black (-)
Temperature Sensor
Measurement Range
-20°C to 70°C (-4°F to 158°F)
Accuracy
±0.47°C at 25°C (±0.85°F at 77°F)
A solar radiation shield is required for accurate temperature
measurements in sunlight
Resolution
0.10°C at 25°C (0.18°F at 77°F)
Drift
Less than 0.1°C/year (0.2°F/year)
Response Time
Airflow (2 m/s): 10 minutes, typical to 90%
Time Accuracy
± 1 minute per month at 25°C (77°F)
Operating Range
-20°C to 70°C (-4°F to 158°F)
Drop Specification
1.5 m (5 ft) onto concrete
Battery
User Replaceable CR-2032 3V Lithium Battery
Battery Life
1 Year with Typical Use
Data Storage Capacity
Logger has 64,000 bytes of nonvolatile data storage. Data
storage requirements per event are a function of enabled
channels
and logging interval. When events are three to 12 days apart,
32
bits are required to record a single event (16,000 events).
When
events are less than 16 seconds apart, only 22 bits are required
to
record a single event (23,000 events). In most cases, 25,000
to
30,000 data points (including events, temperature, and/or
battery
measurements) can be logged. For most rain bucket applications,
battery life, not memory capacity, will be the factor that
limits deployment duration.
Standards Compliance
CE, NEMA 6, IP67
Weight
50 g (1.7 oz.)
Dimensions
71mm x 33mm x 23mm (2.8" x 1.3" x 0.9"); 1.8 m (6 ft) cable
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