Delta OHM HD2301.0R, Manual

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10. To return to measurement mode, use the and arrows until the message "nonE" appears
in the central display and press
UNIT
.
11. Remove the probe from the 75%RH container and close it immediately using its cap.
Calibrating the points at 33%RH and 11%RH
Repeat the points from 3) to 9) using the saturated salts at 33%RH and 11%RH
When completed, unscrew the ring with the cap, and screw the protection grid back on the
sensors. The calibration is now complete.
Important notes:
1)
Do not let hands touch the RH sensor
2)
The sensor base is in alumina so it could easily break
3)
During the entire calibration cycle keep the temperature as constant as possible; plastic
materials are poor thermal conductors, therefore some time is needed for them to reach a
thermal equilibrium
4)
In case no satisfactory results are obtained, check that:
•
the sensor is not faulty, corroded or dirty
•
the measuring chamber is perfectly closed during calibration
•
the saturated solutions are not exhausted. A saturated solution at 11%RH or 33%RH is
exhausted when there is no more salt inside between the two walls but only a thick liquid: in
this case the chamber cannot reach its saturation anymore. For the saturated solutions at
75%RH, check that the salt is not dry (crystallized): in order to reach the saturation, it needs
to be wet.
5)
Storage of the saturated solutions: the saturated solutions must be stored in a dark environment
at a constant temperature of about 20°C with the container well closed inside a dry room.
Temp. Lithium Magnesium Sodium
°C Chloride Chloride Chloride
0 11.23 ± 0.54 33.66 ± 0.33 75.51 ± 0.34
5 11.26 ± 0.47 33.60 ± 0.28 75.65 ± 0.27
10 11.29 ± 0.41 33.47 ± 0.24 75.67 ± 0.22
15 11.30 ± 0.35 33.30 ± 0.21 75.61 ± 0.18
20 11.31 ± 0.31 33.07 ± 0.18 75.47 ± 0.14
25 11.30 ± 0.27 32.78 ± 0.16 75.29 ± 0.12
30 11.28 ± 0.24 32.44 ± 0.14 75.09 ± 0.11
35 11.25 ± 0.22 32.05 ± 0.13 74.87 ± 0.12
40 11.21 ± 0.21 31.60 ± 0.13 74.68 ± 0.13
45 11.16 ± 0.21 31.10 ± 0.13 74.52 ± 0.16
50 11.10 ± 0.22 30.54 ± 0.14 74.43 ± 0.19
55 11.03 ± 0.23 29.93 ± 0.16 74.41 ± 0.24
60 10.95 ± 0.26 29.26 ± 0.18 74.50 ± 0.30
65 10.86 ± 0.29 28.54 ± 0.21 74.71 ± 0.37
70 10.75 ± 0.33 27.77 ± 0.25 75.06 ± 0.45
75 10.64 ± 0.38 26.94 ± 0.29 75.58 ± 0.55
80 10.51 ± 0.44 26.05 ± 0.34 76.29 ± 0.65
85 10.38 ± 0.51 25.11 ± 0.39
90 10.23 ± 0.59 24.12 ± 0.46
95 10.07 ± 0.67 23.07 ± 0.52
100 9.90 ± 0.77 21.97 ± 0.60