HOBO U23 Pro v2 Temperature/Relative Humidity Data Logger
Specification
Temperature Sensor
| Operation Range |
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 & U23-004 external sensors: -40 to 100°C (-40 to 212°F); tip & cable immersion in fresh water up to 50°C (122°F) for 1 year |
| Accuracy |
U23-001A & U23-002A: ±0.25°C (-40 to 0°C); ±0.2°C (0 to 70°C)
U23-003 & U23-004: ±0.21°C (0 to 50°C); see Plot A |
| Resolution |
U23-001A & U23-002A: 0.04°C (0.072°F)
U23-003 & U23-004: 0.02°C at 25°C (0.04°F at 77°F); see Plot A |
| Response Time (90%) |
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
|
| Drift |
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
|
Relative Humidity Sensor (U23-001A & U23-002A)
| Operation Range |
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%
|
| Accuracy |
±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 |
| Resolution |
0.05% |
| Response Time (90%) |
U23-001A: 40 minutes (air 1 m/sec, with protective cap)
U23-002A: 15 seconds (air 1 m/sec) |
| Drift |
<1% per year (typical) |
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 3.6V lithium, user-replaceable (HP-B) |
| Battery Life |
3 years with 1 minute or greater logging interval |
| Memory |
64 KB (±21,000 temperature & RH measurements) |
| Materials |
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
|
| Cables |
U23-001A: No cables
U23-002A: One 184 cm (6 ft) PVC cable; sensor diameter 1 cm (0.38 in.)
U23-003: Two 184 cm (6 ft) PVC cables; sensor diameter 0.5 cm (0.20 in.)
U23-004: One 184 cm (6 ft) PVC cable; sensor diameter 0.5 cm (0.20 in.)
|
| Environmental Rating |
Electronics housing: NEMA 6P equivalent (brief submergence)
RH models: 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 |
| 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 |
U23-001A: 57 g (1.5 oz); U23-002A: 118 g (3.1 oz); U23-003: 138 g (3.7 oz); U23-004: 102 g (2.7 oz) |
| Dimensions |
Housing measures 10.2 × 3.8 cm
4.0 Ã 1.5 in.
|
| NIST Certificate |
Temperature certificate available for additional charge |