Fir 1, 2, 3 & 5000
Ion Science Lt d
Ion Science L td
Page 20 of 53
Instrument Menu
_____
Custom Calibration Procedure
Please ensure you are familiar with this entire calibration procedure before attempting to calibrate this
Fir instrument.
NOTE: The calibration of the Fir instrument must be carried out in a clean air environment. Ensure
all parts of the calibration kit are available and ready for use.
1. Open the 1stPC software package and select 'INSTRUMENT/ MENU SETUP / CALIBRATION'. This screen
allows the user to setup various parameters relating to the custom calibration routine. The Fir
can be setup so each sensor can be calibrated individually using totally separate gas supplies or any
combination. By default ISL's calibration kit contains two SPAN gas cylinders. One contains Methane, H2S
and CO as these gases are not cross sensitive, the other contains Isobutylene. Next, set up the desired
settings on 1stPC and download them to the Fir instrument.
2. Once the calibration setup has been downloaded to the instrument, select the
CUSTOM CALIBRATION icon in the Calibration menu. A tick '
ü
' will appear to
confirm the selection.
NOTE: Pressing the ENTER key allows the user to select which part of the calibration routine is carried out.
Ion Science also suggest carrying out the calibration in the following sequence:-
a.
‘ZERO’ - Zero's the PID, H2S, CO and LEL sensors and sets the span of the LEL sensor.
b.
‘VOC’ - Sets the span level using VOC gas.
c.
‘Mix2’ - This is when you will set the span of the remaining sensors either individually or in
mixtures as defined by the 1stPC software calibration tab.
3. Select the flashing ZERO option and press the ENTER key.
4. Remove the caps from both ends of the carbon canister included in the Cal Kit and remove the probe
and filter from the instrument. Fit the carbon canister to the end of the instrument. NOTE: The carbon
canister simply pushes onto the end fitting, no turning is required. Do not force.
5. Press the ENTER key to start the 'ZERO' process. A counter will count down
showing how long the canister needs to remain connected.
6. At the end of the countdown a tick '
ü
' will appear, indicating that ZERO has been
accepted. Press ESCAPE.
7. Disconnect the carbon canister and replace the cap ends. The useful life of the carbon
canister will be shortened if the canister is open to atmosphere for prolonged periods.
