Appendix
A
32
Instrument Temperature Range:
Operating range: ...................... 5 to 45
°
C (41 to 113
°
F)
Storage range: ......................... -20 to 60
°
C (-4 to 140
°
F)
Time Constant:
Range:...................................... Adjustable from 2 to 60 seconds
Data Logging:
Data points: .............................. 63,000 (14 days of logging
simultaneous CO
2
, Temperature,
and Humidity at 1-minute intervals).
Logging interval:....................... User adjustable from 1 second to
1 hour
Power Requirements:
Batteries: .................................. Four AA-size Alkaline or NiCd
or
AC adapter: .............................. 6 VDC nominal, 300 ma, [Q-T
RAK
mates with 5.5 mm OD x 2.1 mm ID
plug, center pin po)]
Approx. battery Life: ................. 13.5 hours (Alkaline), 4.75 hours
(NiCd)
Physical:
External dimensions:................ 107 mm x 183 mm x 38 mm
(4.2 in x 7.2 in x 1.5 in)
Probe length: ............................ Model 8551: 17.8 cm (7.0 in)
Model 8550: 14.7 cm (5.8 in)
Probe diameter:........................ 1.9 cm (0.75
in)
Weight: ..................................... 0.59 kg (1.3 pounds) (with batteries)
Display:..................................... 4-digit LCD, 15 mm (0.6 in) digit
height
Maintenance Schedule:
Factory calibration:................... Annually
User calibration: ....................... As needed
Serial Interface:
Type: ....................................... RS-232
BAUD rate: .............................. 1200
Data bits: .................................. 8
Stop bits: .................................. 1
Handshaking: ........................... None
Data format:.............................. ASCII
