27
Cross Calibration:
This option should be selected when all the gas monitors to be bump tested
or calibrated by an I-Test are not all configured with the same flammable gas
sensor or if the target gas is not available for monitors containing C
5
H
12
, C
3
H
8
,
C
4
H
10
sensors.
For example if the fleet contains a mixture of monitors with CH
4
and C
3
H
8
sensors both requiring test by I-Test, then the cross calibration option should
be selected when configuring the cylinder.
This will allow both the CH
4
and C
3
H
8
gas monitors to undergo the desired
bump or calibration test in the same I-Test unit.
i
If the cross calibration option is selected, cylinders must be configured with CH4 as the
flammable gas. The concentration of CH4 must be 1.2% volume for ATEX/IECEx monitors
and 1.5% volume for UL monitors.
For a list of cylinders available from Crowcon please refer to
.
The gas cylinder for cross calibration must have a tolerance no greater than 5%.
If the Cross Calibration option is selected this will also allow gas monitors to be
bump tested with non target gas in the same manner as described above for
calibration.
Note: T4 must only be calibrated with a cylinder containing CH4, the
cross calibration option is not applicable for T4 and will not operate in a T4
configured I-Test.
Gases:
Click on a gas in the Gases list and then make a selection from the Gas drop
down list, and enter the standard gas value in the Standard Value field.
Dependant upon cylinder type selected the gas options are CH
4
, C
5
H
12
, C
3
H
8
,
C
4
H
10
, CO, H
2
S, CO
2
& O
2
Appendix A: Allowable Cylinder Profiles
Dependant upon the suitability option chosen, I-Test Manager will restrict the
gas value entered to ensure the gas value is appropriate for the Suitability
selected.
When defining the standard value of the flammable gas selected, the gas value
must be entered in units of %volume. The saved value will be converted to
%LEL for internal use in I-Test.
Note: T4 must only be bump tested and calibrated with a cylinder containing
CH
4
. A T4 configured I-Test will not perform the configured test if any other
cylinder is connected to I-Test.
X
When the alterations have been made, click Update Gas. This will update the entry in the Gases list.
X
Repeat this process for each gas to be defined in the cylinder profile.
Contents
Exit
Unpacking
Set-up
Operating I-Test
I-Test
Manager
Configuring
I-Test
Warranty
Overview
Contacts
Appendices
Troubleshooting
Specification