Vaisala GMK220 User Manual download pdf (Page 11)

Chapter 3_____________________________________________________________________ Operation

VAISALA _____________________________________________________________________________9

Two-point calibration

The reference gases used for the two-point calibration shall represent the low

and high end of the probe's measuring range. Please, read recommendations

concerning the reference gases in Chapter 2 Additional equipment before

starting the operation.

Perform the two-point calibration according to the following

instructions:

1. Connect the cable (item 2, Figure 1) to the probe to be tested.

2. Insert the probe into the chamber (item 5, Figure 1) so that the

perforated filter cover is completely inside the chamber.

3. Connect the PC to the calibrator with the serial cable (item 8,

Figure 1). Check the connection set-up, the serial line settings for data

transfer shall be

• 9600 baud

• parity: 8/None

• 1 stop bits

4. Connect the 24 VDC supply power to the connectors located on

the right-hand side of the plate (items 9 and 10, Figure 1).

5. The following (or similar) text appears in the terminal window on

the PC screen (number of the program version can be updated):

GMT220A - Version: STD 4.08

6. Let the calibrator settle for 10 minutes.

7. Connect the low-end gas and adjust the flow rate of 0.6 l/min with

a screwdriver (item 4, Figure 1). Flush the chamber with the gas for 5

minutes.

8. Give the password by typing

PASSWORD 5120<CR>

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Vaisala GMK220 User Manual Page 11