Psychrometric Chart - IBM TS2900 Manual

2
Recommended
Allowable
3
16°C - 32°C 16°C - 25°C
(60°F - 90°F) (60°F - 77°F)
Notes:
1. Product equipment is removed from the original shipping container and installed but not in use - for example, during repair, maintenance, or upgrade.
2. Derate maximum dry-bulb temperature 1°C/300 m above 900 m (1.8°F/1,000 feet above 3,000 feet).
3. Derate maximum recommended dry-bulb temperature 1°C/300 m above 1,800 m (1.8°F/1,000 feet above 6,000 feet).
4. Applies to the LTO drive generations 1 through 8.
5. Applies to the LTO drive generation 9.

Psychrometric chart

Figure 1. Psychrometric chart showing recommended and allowable operating environments for the tape library
10 15
Notes:
The chart is shown in SI (metric) units and a barometric pressure of 101.325 kPa (sea level).
The recommended operating environment specifies a long-term operating environment that can result in the greatest reliability and energy efficiency.
The allowable operating environment represents where the equipment was tested to verify functionality.
Gas and particulate exposure
Contamination
Gaseous
Severity level G1 as per ANSI/ISA 71.04-1985
contamination
(Å/month, ≈ 0.0039 µg/cm² - hour weight gain)
hour weight gain)
side at one-quarter and three-quarter frame height off the floor or where the air velocity is much higher.
Particulate Data centers must meet the cleanliness level of ISO 14644-1 class 8. For data centers without airside economizer, the ISO 14644-1 class 8
contamination cleanliness might be met by the choice of the following filtration:
The room air might be continuously filtered with MERV 8 filters.
Air entering a data center might be filtered with MERV 11 or preferably MERV 13 filters.
For data centers with airside economizers, the choice of filters to achieve ISO class 8 cleanliness depends on the specific conditions present at that
data center. The deliquescent relative humidity of the particulate contamination should be more than 60% RH.3
5
whiskers .
Product operation (equipment is powered on)
Max rate of Allowable
change
5°C/hour 20 - 80% RH
(9°F/hour)
Psychrometric Chart
Recommended
20 25
Dry Bulb Temperature (°C)
Table 5. Gas and particulate exposure
1
, which states that the reactivity rate of copper coupons shall be fewer than 300 Angstroms per month
2
. In addition, the reactivity rate of silver coupons shall be less than 300 Å/month (≈ 0.0035 µg/cm² -
3
. The reactive monitoring of gaseous corrosivity should be conducted approximately 5 cm (2 in.) in front of the rack on the air inlet
Recommended Max rate of
change
20 - 50% RH 5% RH/hour 26°C (79°F)
with no
condensation
0.040
0.030
0.020
Allowable
0.010
0.000
30 35
Requirement
22°C (72°F) 3050 m 5°C - 4
(10,000 feet) (40°F t
4
.Data centers must be free of zinc
TS2900 Tape Autoloader 11