Operation, Spot checking, Chapter 3 – Vaisala GMK220 User Manual

Page 8

User's Guide __________________________________________________________________________

6 __________________________________________________________________________ U421EN-1.1

CHAPTER 3

OPERATION

Spot checking

Spot checking is carried out when there is a need to check if the probe (GMP221
or GMP222) is operating correctly. The reference gas concentration must be
within the measuring range of the probe to be checked. Please read requirements
concerning the reference gases from Chapter2 Additional equipment before
starting the operation.

Perform the spot checking 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 (items 9 and
10, Figure 1).

5. The following (or similar) text appears in the terminal window on
the PC screen (program version number can be updated):