Hobo Pro v2 Manual

HOBO® Pro v2 (U23-00x) Manual
HOBO Pro v2 U23-004 shown
1.800.561.8187
The HOBO Pro v2 logger's environmentally rugged case is designed for years of reliable use
in outdoor applications. It has enough memory to record over 42,000 12-bit measurements.
The logger uses an optical USB communications interface (via a compatible shuttle or base
station) for launching and reading out the logger. The optical interface allows the logger to
be offloaded without compromising the electronics. The USB compatibility allows for easy
setup and fast downloads.
Specifications
Temperature Sensor
Operation Range
Accuracy
Resolution
Response Time
(Typical to 90%)
Drift
Relative Humidity Sensor (U23-001A, U23-002A only)
Operation Range
Accuracy
Resolution
Response Time
(Typical to 90%)
Drift
Logger
Operation Range
Real-time Clock
Battery
Battery Life (Typical Use)
Memory (Non-Volatile)
Materials
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U23-001A internal sensor: -40 to 70°C (-40 to 158°F)
U23-002A external temperature sensor: -40 to 70°C (-40 to 158°F)
U23-003 and U23-004 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
U23-001A and U23-002A: ±0.25°C from -40 to 0°C (±0.45 from -40
to 32°F), ±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F)
U23-003 and U23-004: ±0.21°C from 0° to 50°C (±0.38°F from 32°
to 122°F); see Plot A
U23-001A and U23-002A: 0.04°C (0.072°F)
U23-003 and U23-004: 0.02°C at 25°C (0.04°F at 77°F); see Plot A
U23-001A internal sensor: 10 minutes in air moving 1 m/sec
U23-002A external temperature sensor: 3 minutes, 45 seconds in
air moving 1 m/sec
U23-003 and U23-004 external sensors: 3 minutes in air moving
1 m/sec; 30 seconds in stirred water
U23-001A and U23-002A: <0.01°C (0.018°F) per year
U23-003 and U23-004: <0.1°C (0.18°F) per year
0 to 100% RH, -40° to 70°C (-40° to 158°F)
Exposure to conditions below -20°C (-4°F) or above 95% RH may
temporarily increase the maximum RH sensor error by an
additional 1%
±2.5% from 10% to 90% RH typical to a maximum of ±3.5%
including hysteresis at 25°C (77°F); below 10% and above 90% ±5%
typical
0.05%
U23-001A: 40 minutes in air moving 1 m/sec with protective cap
U23-002A: 15 seconds in air moving 1 m/sec
<1% per year typical
-40° to 70°C (-40° to 158°F)
±1 minute per month 0° to 50°C (32° to 122°F)
1/2 AA, 3.6 Volt lithium, user-replaceable (HP-B)
3 years with 1 minute or greater logging interval
64K bytes memory (approx. 21,000 temperature and RH
measurements)
All models: ASA styrene polymer housing and mounting clamp;
polypropylene protective cap; Buna-N o-ring(s); U23-001A,
U23-002A only: ASA styrene polymer RH sensor cap; modified
hydrophobic polyethersulfone membrane
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