IEQ Chek
Operation Manual
20
1509-9001 Rev 1
6.3. Calibration Process: Zero
Press the MENU button on the instrument to enter the main menu. Using the ARROW
DOWN button scroll down to
CALIBRATE
and press the MENU button. The LCD will
indicate
(CODE) ENTER SECURITY CODE
. The calibration function is security code
protected to prevent unauthorized personnel or personnel that have not been trained,
from performing this important function.
Enter the security code correctly. The LCD indicates
CAL
and the next menu
selections
PREVIOUS
,
SPAN
, and
ZERO
.
NOTE:
If an incorrect code is input, the LCD indicates
INVALID SECURITY CODE
ENTERED
and the user is taken back to the basic menu.
Step Zero Procedure
1.
Use the ARROW DOWN button to scroll down to the ZERO function and
press the MENU button to select it. The LCD then indicates
PREVIOUS
and
ALL
, and lists all installed sensors.
2.
Use the ARROW DOWN button to scroll to the desired sensor then push
the MENU button to select. The LCD then indicates
ZERO
and
APPLY
GAS NOW
.
3.
Attach the cylinder flow regulator to the cylinder of 100% nitrogen.
4.
Open the valve fully.
5.
Attach the brass fitting to the inlet fitting of the IEQ Chek
.
6.
Verify that a bar appears along the bottom of the LCD indicating the
progress. At 100% it indicates
ZEROING SENSOR
and another bar
indicates the progress. Upon completion, the LCD indicates
ZERO HAS
BEEN UPDATED
and the LCD returns to the CAL menu.
7.
Repeat this procedure for all installed sensors.
NOTE:
If the user neglects to flow 100% nitrogen over CO
2
and O
2
sensors or zero air
over all other sensors, the instrument indicates an error. Catalytic sensors require
clean air (contains oxygen) to achieve zero.
6.4. Calibration Process: 3-Point Span
IEQ Chek
provides a 3-point span calibration for infrared CO
2
sensors
ONLY
, to
provide maximum accuracy. For ALL other sensors, follow the single point calibration
procedure indicated in Section 6.5 (refer to page 21).
Step 3-Point Span Procedure
1.
First, complete the zero calibration as indicated on page 20.
2.
Press the MENU button on the instrument to enter the main menu. Using
the ARROW DOWN button scroll down to
CALIBRATE
and press the
MENU button. The LCD will indicate
(CODE) ENTER SECURITY CODE
.
The calibration function is security code protected to prevent unauthorized
personnel or personnel that have not been trained, from performing this
important function. The default security code is 1234.
