IEQ Chek
Operation Manual
22
1509-9001 Rev 1
Step 1-Point Span Procedure
1.
First, complete the zero calibration procedure 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.
3.
Enter the security code correctly and the LCD indicates
CAL
. Using the
DOWN ARROW scroll to
SPAN
and push the MENU button. The next
menu indicates installed gas sensors.
4.
The LCD indicates the list of installed sensors. Use the ARROW DOWN
button to scroll to the first sensor to be span adjusted and press the MENU
button again.
5.
The LCD moves to the
SPAN
menu and indicates
SPAN GAS VALUE
.
The cursor flashes over the first of four digits indicating the user must set
the correct span gas value. This value must match the gas concentration
on the cylinder of span gas for that specific sensor, then press the MENU
button. If the span gas concentration is 50 (for example), then the value
should read “050.0”.
6.
The LCD indicates
APPLY GAS NOW…
. A scroll bar at the bottom of the
LCD indicates the progress on a scale of 0 to 100% as the instrument
waits for sensor to stabilize to the span gas. Then the LCD indicates
SPANNING CO
. Once again the scroll bar at the bottom of the LCD
indicates the span progress on a scale of 0 to 100%. Upon completion, the
LCD indicates
SPAN HAS BEEN UPDATED
and goes back to the
CAL
menu.
7.
Repeat this procedure for all installed sensors as desired.
NOTE:
The O
2
sensor does not indicate the first span menu screen
APPLY GAS
NOW
. For this reason, ensure any oxygen span gas utilized is connected and flowing
to the sensor before entering the span menu. Alternatively, use the ambient
environment as a source of 20.9% volume O
2
but make sure you do not exhale in the
direction of the pump inlet fitting. The CO
2
you exhale will influence the value of the
oxygen reading. It is the only sensor that skips the first span calibration menu screen.
7. ADDING OR CHANGING PLUG-AND-PLAY SENSORS
The IEQ Chek
accommodates up to seven sensors. Two of those sensors are
temperature and relative humidity and these sensors are permanently installed in all
instruments. Five of the sensor locations accommodate gas sensors (see Figure 7-1
below). Three of the sensor locations visible along the back edge of the sensor cover
accommodate
only
electrochemical toxic gas and/or oxygen sensors. There are two
sensor locations located along the front edge of the sensor cover. Each of the two
front edge sensor locations can accommodate either an infrared CO
2
sensor, a PID
sensor, or a combustible (flammable) gas sensor. See photo reference (Figure 7-2)
on page 24.
