Axis BTA 2100D Instrukcja Operatora Pobierz pdf (Strona 80)

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When it is properly adjusted, the dialog will say the rf response is within limits.

When you are finished, select the Done button.

To adjust the Cal gas pressure click “Adjust Cal Gas”. You obtain a screen from

which you can check and adjust the setting of the calibration compound needle

valve.

When adjusting the cal gas, the following happens automatically. The filament,

electron multiplier, and rf voltage are turned on; the calibration compound

solenoid operated valve is opened; and the scan range is set to display

calibration compound peaks from 45 to 135 m/z. Then, the program determines if

the calibration compound pressure in the vacuum manifold is too low, too high, or

satisfactory.

Under Control and Status dialog box, messages are displayed that indicate the

status of the calibration compound pressure in the vacuum manifold. The

messages are listed below.

Below the dialog box, a progress bar display that shows the status of the

pressure visually.

If the pressure is satisfactory, you will receive the following message:

The calibration gas pressure is OK. Allow time for the gas to flow and the

emission current to equilibrate.

In this case, click Done.

If the calibration compound pressure is too low, you receive the following

message:

Increase calibration gas pressure by adjusting the calibration needle valve.

Allow time for the gas to flow and the emission current to equilibrate.

In this case, turn the calibration compound needle valve 1/4 turn

counterclockwise. Wait for about 30 seconds for the instrument to equilibrate.

Then, note the message again.

If the pressure is too high, you will receive the following message:

Decrease calibration gas pressure by adjusting the calibration needle

valve. Allow time for the gas to flow and the emission current to

equilibrate.

In this case, turn the calibration compound needle valve 1/4 turn clockwise. Wait

for about 30 seconds for the instrument to equilibrate. Then, note the message

again.

If you are using Chemical Ionization you will need to select a CI reagent gas

and adjust its pressure. Select the reagent gas you are using by clicking on the

arrow below the word Adjust.

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