Vaisala GMK220 User Manual download pdf (Page 7)

Chapter 2______________________________________________________________Product description

VAISALA _____________________________________________________________________________5

Additional equipment

The following additional equipment is needed for checking and

calibration operations:

• Traceable reference gas/es as follows:

spot checking: one gas with CO

concentration within the

measuring range of the probe. Accuracy shall be 1% (or better).

two-point calibration: two gases with CO

concentrations

representing the low and high end of the probe's measuring range.

See the requirements below.

• Pressure regulator (giving about 1 bar pressure)

• PC and a terminal software (e.g. Windows

Hyper Terminal)

• Power supply, 24 VDC/1A

In addition, values on the ambient temperature (with accuracy of ± 0,5

ºC) and barometric pressure (with accuracy of ± 1 hPa) are needed as

input data during the checking or calibration procedure.

Requirements for the calibration gases

Low end

calibration gas

gas with a purity of N50 (or better).

Traceable to appropriate standards (for

example NIST).

High end

calibration gas

Mixture of CO

and N

gases

concentration shall be 95...105 % of the

measuring range of the probe. Accuracy shall

be 1 % (or better). Traceable to appropriate

standards (for example NIST).

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Vaisala GMK220 User Manual Page 7