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3. GENERAL SPECIFICATION
Sensor
................................................................interior
Measurement range
- humidity ........................................................ 0 ÷ 100 %RH
- temperature................................................... -30 ÷ 80 °C
Measurement accuracy
- humidity
(AR236)...........................................±3 %RH (20 ÷ 80 %RH)
±3 ÷ 5 %RH (in the remaining measurement range)
- temperature
- AR236...............................................±0,5°C (20 ÷ 30°C)
±0,5 ÷ 1,8°C (in the remaining measurement range)
- AR232...............................................±0,5°C (-10 ÷ 80°C),
±0,5 ÷ 1,7°C (in the remaining measurement range)
Measurement resolution
.................................. 0,1 %RH i 0,1 °C
Hysteresis
(AR236)........................................... ±1% RH
Long-lasting stability
(AR236)......................... <0,5% RH/year
Response time
(63%)....................................... 10s (@ air flow > 1m/s)
Measurement and writing period
.................... programmable, 10s do 24h
Operating environment
................................... air and neutral gases
Communication interface
................................ USB (to communicate with computer), drivers
compatible with Windows 2000/ XP/Vista/7 OS
Storage (non-volatile)
- interior ......................................................... 4MB FLASH memory, file system FAT12, record up to
75,000 measurements (up to 80,000 for AR232)
- exterior ....................................................... SD/MMC card, recommended capacity ? 1 GB and FAT16
max. capacity 2GB
- supported file systems.....................FAT12, FAT16, FAT32
- card connector.................................push-out type
Real-time clock (RTC)
......................................quartz, date (yyyy:mm:dd), time (hh:mm:ss),
remembers about leap year
Optical indication
.............................................LED diodes: "READ/WRITE", "STATUS", 1 or 2 alerts
LCD display
(7 segments)................................ number of digits: 3, digits height 10 mm
Power
................................................................ lithium battery 3.6 V type AA (R6), 2450 mAh, (SAFT LS14500)
Working time on new battery
(1)
.....................up to 5 years (in ambient temperature 20 ÷ 30 °C)
Nominal operation environment
.....................-20 ÷ 70 °C, <100 %RH (without condensation)
Protection level
................................................IP20
Casing
...............................................................on-wall, material ABS UL94-V0, white
Casing dimensions
..........................................80 x 80 x 25 mm
Working position
..............................................any
Weight
............................................................... ~97g (with battery)
(1)
- working time depends on measurement period, whether SD/MMC card is used, working mode of LCD
display and working temperature:
- 5 years (measurement period > 10 min., data recorded in internal storage, copying data only via
USB, LCD in economic mode, 20÷30 °C), 20 months with LCD display constantly enabled
- 7 months (measurement period 10 s, internal memory, copying data only via USB, 25 °C)
- 1.5 years (measurement period > 10 min., data recorded on SD/MMC card, LCD display in economic
mode, 20÷30 °C)
- 4 months (measurement period 10 s, data recorded on SD/MMC card, 20÷30 °C)
- unused card left in card slot also wears out the batteries
- moving the contents of full internal storage (4 MB) to an SD/MMC card takes about 2 min. and uses
about 1÷2 mAh of the battery power (tests run on SanDisk and Kingston cards)
- LCD display running in constant mode and with refresh rate of the measured quantity > 1 min. uses
about 80 mAh/month (3.3% of battery power per month)
- when optional adapter is used, new battery working time may be extended up to about 8 years (20÷30°C)
