Vaisala CARBOCAP GMT220 SERIES Guia do Utilizador descarregar pdf (Página 14)

USER'S GUIDE_______________________________________________________________________

12 ___________________________________________________________________ M010022EN-C

Calibration

Comparison with the calibrated probe

It is recommended to check the calibration of the GMT220 every

second year. A simple field calibration checking can be performed by

using a calibrated reference probe. During the checking procedure,

please avoid exhaling towards the probe as this alters the CO

concentration.

1. Check the current transmitter reading.

2. Replace the probe with the reference.

3. Let the transmitter stabilize for a few minutes. The measured CO

concentration near by the transmitter may have increased due to

breathing.

4. Compare the readings measured with the original and the

reference probe.

The difference between the readings should be less than 5 % of the

full scale reading of the GMT220. If there is need for an adjustment of

the probe, please contact Vaisala SSD Service or Vaisala's

representative (see page 14).

On-site checking and adjusting by using a

reference gas and GM70 hand-held meter

A probe to be checked can be flushed in a reference gas by using a

field check adapter (optional part, 26150GM). The procedure requires

pressurized gas bottle giving a flow rate of 0.4...1.0 l/min through the

adapter chamber. If an adjustment is needed, it can be carried out by a

user with a Vaisala's hand-held carbon dioxide meter GM70. Probes

can be sent also to Vaisala SSD Service Centers (see page 14) to be

calibrated.

Calibrator GMK220

The Vaisala GMK220 calibrator is intended for spot checking and

two-point calibration of the GMT220-series probes. The calibration

parameters are stored to the nonvolatile memory of the probes.

Contact Vaisala's representative to get more information about the

GMK220.

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Vaisala CARBOCAP GMT220 SERIES Guia do Utilizador Página 14