Vaisala GMP343 Manuel d'utilisateur télécharger pdf (Page 64)

User’s Guide ______________________________________________________________________

62 ___________________________________________________________________M210514EN-E

Calibration and Adjustment by the User

Calibration and adjustment are carried out by using the serial

communications and the calibration gas(es).

Additional equipment needed:

- power supply 11...36 VDC

- PC and PC connection cable (Vaisala order code 213379) with

optional USB adapter (Vaisala order code 219686)

- calibration gases and tubing

- calibration adapter is required for calibrating the diffusion model

(Vaisala order code GMP343ADAPTER)

- pressure regulator and flow meter

- barometer (for measuring ambient pressure)

Calibration (Checking)

The gas concentration of the reference gases must cover the measurement

range of the device.

Checking the Compensations

1. Connect GMP343 to a PC and open the terminal program. For more

information, see section Connecting GMP343 to PC on page 27.

2. Connect the 24 VDC supply power to GMP343.

3. Compensations must always be enabled during the calibration

procedure. Use the ? command to verify the status of the

compensations for ambient pressure, temperature, relative humidity,

and oxygen concentration:

?<cr>

4. If all compensations are not enabled, make note of the current settings

so that you can restore them after the calibration if desired. Then issue

the following commands to enable the compensations:

PC ON<cr>

TC ON<cr>

RHC ON<cr>

OC ON<cr>

5. You must also set the ambient pressure, relative humidity, and oxygen

concentration values of the calibration gas correctly. Typically the

relative humidity of the calibration gases is 0 % RH. Oxygen

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Vaisala GMP343 Manuel d'utilisateur Page 64