OptiCal User’s Manual
14
97079 Issue 9.2, March 2016
OPERATION
3.5
Typical Response Times for Various Step Changes
Typical response times for various step changes are shown in Table 1 below. T100
represents the total time taken to reach stability at the new set-point.
T63 and T95 values represent the time taken to reach 63% and 95% respectively of
the step change in relative humidity and/or temperature. (Start temperature = 23°C /
Start RH = 50%)
Temperature
°C
RH %
T63
T95
T100
Step 1
15
20
≤
12
≤
23
≤
26
Step 2
15
50
≤
2
≤
3
≤
5
Step 3
15
80
≤
3
≤
7
≤
9
Step 4
25
20
≤
3
≤
5
≤
14
Step 5
25
80
≤
3
≤
8
≤
10
•
The time taken depends on the quality of the desiccant and the overall temperature of the OptiCal calibration chamber
Time in minutes
Table 1
Typical Response Times for Step Changes
The OptiCal can also be used with relative humidity generation only or with temperature
generation only.
For example: If the calibration on the instruments is done and new instruments need
to be inserted, both switches can be set to
OFF
. This will cause the pump to switch off
in order to save energy.
If only temperature calibration is needed, humidity generation can be switched off.
NOTE: In this instance, the pumps will also stop.
The minimum chamber temperature that can be reached is about 10°C (18°F) below
ambient temperature. The maximum chamber temperature is limited to about +52°C
(+125°F).
