ACR Electronics SmartReader Plus Manual de usuario descargar pdf (Pagina 79)

SmartReader Data Logger

calibrating an EH-020A probe, ensure it is properly connected to the logger and the

external RH and temperature channels are enabled.

2. Start the test chamber at 5% RH and place your logger (SmartReader 2 or 4) or EH-020A

probe into the test chamber. Wait 20 minutes.

3. Adjust the chamber to 20% RH and wait for 20 minutes. The wait is necessary to ensure

the chamber has adequate time to settle at the desired level.

4. Adjust the chamber to 80% RH and wait an additional 20 minutes.

5. Remove your logger or RH module from the test chamber and backup the recorded

information onto your computer. If you are working with more than one logger, use the

serial number as the file name to help match the data with the logger when you make

calibration adjustments.

6. Call up the logger file on your computer using TrendReader. The profile you see should

reflect the test you have just performed.

7. Zoom in on the section that relates to the 20% RH level in the test chamber. Use the

mouse to find the byte value recorded during the latter part of the test (refer to step 3).

Record this as the "bL" reading.

8. Zoom in on the section that relates to the 80% RH level in the test chamber. Again, use

the mouse to find the byte value recorded at the end of the test (refer to step 4). Record

this value as the "bH" reading.

9. Switch to the Setup window in TrendReader software.

10. Use the following equation to calculate the "Low" calibration adjustment value:

Low = (63 x bL - 170 x bH) / 428

11. For the "High" calibration adjustment value use the following equation:

High = 40 x (-107 / (bH - bL) - 1)

12. Now enter the same values by revising the logger file and view the corrected graphs.

13. If the results are satisfactory, save the calibration changes to the logger (remember to set

the RH channel's equation number back to 71).

Saturated Salt Test

Using saturated salt solutions is the most accurate field technique for RH calibration.

To check your humidity data logger with saturated salt solutions, gather the following

equipment and materials:

· Wide mouth canning jars, 1000ml with metal lids

· #9 stoppers (Fisher #14-130N)

· Powder Funnel (Fisher #10-346-5B)

· Long Stem Funnel (Fisher #10-325D)

· Cardboard or wooden box

· Styrofoam chips (or other insulating material)

· Reagent grade salts:

1. LiCl (anhydrous), 75gm (Fisher #L-121)

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ACR Electronics SmartReader Plus Manual de usuario Pagina 79