| Family
Features & Specifications |
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• Weatherproof housing for use
in outdoor or condensing environments
• High-accuracy
• Replaceable RH 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 |
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| Memory: |
42,000 measurements |
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| Sampling Rate: |
1 second to 18 hours
Fixed rate or multiple logging intervals, with up to 8
user-defined logging intervals and durations. |
| Time accuracy: |
1 minute/month at
25°C (77°F) |
| Battery life: |
3 years (typical)
– user-replaceable 1/2 AA 3.6 Volt lithium battery |
| Weight: |
U23-001: 57 g (1.5 oz);
U23-002: 118 g (3.1 oz); U23-003: 138 g (3.7 oz); U23-004: 102 g
(2.7 oz) |
| Dimensions: |
Housing measures 10.2 x 3.8 cm
(4.0 x 1.5 in.) |
| CE |
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| Internal
Temperature |
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| Measurement range: |
-40 to 70°C (-40 to 158°F) |
| Accuracy: |
±0.2°C over 0 to 50°C (±0.36°F
over 32° to 122°F) |
| Resolution (12-bit): |
0.02°C at 25°C (0.04°F at 77°F) |
| Response time: |
40 minutes (to 90% in airflow
of 1 m/sec) |
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| External
Temperature |
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| Measurement range: |
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| U23-002: |
-40° to 70°C (-40° to 158°F) |
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| U23-003 &
-004: |
-40° to 100°C (-40° to 212°F);
sensor tip and cable immersion in fresh water up to 50° (122°F)
for one year |
| Accuracy: |
±0.2°C over 0 to 50°C (±0.36°F
over 32° to 122°F) |
| Cable Length: |
1.8 m (6 feet) |
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| Resolution (12-bit): |
0.02°C at 25°C (0.04°F at 77°F) |
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| Response time: |
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| U23-002: |
5 minutes (to
90% in airflow of 1 m/sec) |
| U23-003 &
-004: |
3 minutes (to 90% in airflow of
1 m/sec);
30 seconds (to 90% in water) |
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| Relative
Humidity |
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| Measurement range: |
0 to 100% RH |
| Accuracy: |
±2.5% from 10 to 90% |
| Resolution (12-bit): |
0.03% RH |
| Response time: |
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| U23-001: |
10 minute
typical (to 90% in airflow of 1 m/sec; RH change only) |
| U23-002: |
4 minutes typical (to 90% in
airflow of 1 m/sec; RH change only) |
