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FirstCheck+ 1000, 2000, 3000 & 5000
Instrument Menu
Custom calibration
When Custom Calibration is selected a Zero and Span can be set by the user. This allows the user to
calibrate the FirstCheck+ PID to an alternative gas (other than Isobutylene). Ion Science provide a
Calibration Kit accessory (Part number A-845213) which is recommended for use with FirstCheck+, however
other gases specific to your needs can also be used.
If performing a custom calibration using the Ion Science Calibration Kit accessory, you will need you use the
Cal Adaptor supplied with your FirstCheck+ in the Cal Kit sample box.
In order to carry out a custom calibration the appropriate parameters need to be set via the 1stPC software
and downloaded to the FirstCheck+ instrument. Please see the FirstCheck+ software calibration section (see
st
„1
PC Software‟) for details on how this can be achieved. Once these parameters have been set, a custom
calibration can be completed (please see recommended procedure below.)
Ion Science suggests custom calibrating when detection in ppb is required, or when high accuracy is needed
for a specific gas other than Isobutylene.
Custom Calibration Procedure
Please ensure you are familiar with this entire calibration procedure before attempting to calibrate this
FirstCheck+ instrument.
NOTE: The calibration of the FirstCheck+ 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 FirstCheck+
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, H
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 FirstCheck+ instrument.
2. Once the calibration setup has been downloaded to the instrument, select the
CUSTOM CALIBRATION icon in the Calibration menu. A tick 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 where the span of the remaining sensors is set, 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 filter 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.
Ion Science Ltd
Page 18 of 45
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Ion Science Ltd
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