Figure 7: connection of calibration gas cylinder – ENMET MEDAIR 2200 User Manual

Page 29

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ENMET Corporation

Figure 7: Connection of Calibration Gas Cylinder

5.4.3

A Low Cal/ZeroCal Adjust

A Low Cal function should be performed only when the

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sensor are exposed to clean uncontaminated

air. Use a cylinder of 20.9% oxygen to provide a clean air reference if necessary. Attach the cylinder to the
calibration adapter, attach the adapter to the instrument and allow gas to flow over the sensor for up to 4 minutes.

Enter the maintenance menu by repeatedly pressing

OPTION

switch, until the maintenance menu is displayed. See

Figure 6,

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Maintenance Menu flow chart.

The first menu available is the Low Cal/ZeroCal.

Press the

SELECT

switch 4 times to perform a Low Cal.

If the Low Cal/ZeroCal is successful, The display will change to Hi Cal/SpanGas.
If you wish to Hi Cal/SpanGas the sensor apply calibration gas. Proceed to gas calibration Section 5.3.1B
If you wish to Exit the maintenance menu, Press and

hold

OPTION

switch until the Maintenance Menu is displayed

then release. Then press

OPTION

switch until “Exit maint menu” appears and then press

SELECT

switch to return the

instrument to the Operational Display

If the Low Cal/ZeroCal is Not successful, sensor is outside of safe parameters to Low Cal, a “SLP/Off Set err”
will be indicated. Repeat Section 5.3.1 Low Cal/ZeroCal Adjust making sure to use a cylinder of 20.9% Oxygen.

5.4.3

B High Cal/SpanGas Adjust

A High Cal/Span Gas should only be preformed after a successful Low Cal/ZeroCal has been completed.

Press the

SELECT

switch, that moves the cursor one digit to the right when the last digit is accepted the display

will move to "

HiCal xx

" gas calibration.

= the level of gas to be used for calibration. The mV reading is

shown in the upper right hand corner of the display.

Apply calibration gas to sensor. See Figure 7. After about 1 minute and mV reading has stabilized.

Press the

SELECT

switch, that moves the cursor one digit to the right, when the last digit is accepted and the

calibration is successful the display will momentarily show Cal OK then slope and off set readings, before
returning to the Calibration Menu.

If High Cal is not successful, sensor is outside of safe parameters to High Cal, a Cal Slop Err will be indicated.
Verify calibration gas is correct and that the gauge on the regulator shows pressure in the cylinder.

Repeat above steps for each channel to be calibrated.
To continue on too next section Press the

OPTION

switch.

Press

OPTION

switch until “Exit maint menu” appears and then press

SELECT

switch to return the instrument to the

Operational Display

Cylinder of Gas

Cylinder Valve
and Regulator

Calibration/Sample
Port