Vaisala HUMICAP MMT162 Uživatelská příručka stáhnout pdf (Strana 63)

Chapter 6 ___________________________________________________ Calibration and Adjustment

VAISALA ________________________________________________________________________ 61

Relative Humidity Adjustment on Serial Line

Required equipment:

- Computer with

- Windows operating system

- Terminal application

- Free USB port

- Driver for Vaisala USB cable installed

- USB serial interface cable (219690)

- One or two humidity references that fulfill the requirements listed in

section Adjustment Points on page 55.

For example, you can use the Vaisala HMK15 humidity calibrator for a

two-point humidity calibration and adjustment. Use the LiCl (11 %RH)

and NaCl (75 %RH) salt solutions. You also need the special cover set

for HMK15 (230914). For two-point calibrations using HMK15, use a

dedicated cover for each salt chamber to avoid long stabilization times

and possible contamination of the salt references.

1. If any cable is connected to port I of the MMT162, disconnect it.

2. Remove the filter from the MMT162 and insert the sensors into the

humidity reference. If you are starting a two-point calibration, start

with the dry end reference. If you are using the HMK15, start with

the LiCl salt bath (11 %RH).

3. Wait at least 30 minutes for the humidity to stabilize.

4. Connect the MMT162 to a PC, see section Serial Communication

on page 22. Then open a terminal program.

5. Enter the l command to view the currently active calibration

coefficients. For more information, see section Show User

Calibration Coefficients on page 42.

6. Enter the crh command and press Enter:

crh

7. Type c and press Enter to update the reading and verify that the

reading has stabilized:

RH : 11.9206 1. ref ? c

RH : 11.9206 1. ref ?

8. When the reading is stable, enter the reference humidity after the

question mark and press Enter:

RH : 11.9191 1. ref ? 11.3

Press any key when ready ...

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Vaisala HUMICAP MMT162 Uživatelská příručka Strana 63