INFICON Sensistor ISH2000 Hydrogen Leak Detector - Manual (Page 19)

Hydrogen leak detector Sensistor ISH2000 - Operating Manual
OM-Sensistor ISH2000-EN-201304 19
EN
7 Calibrate the leak detector
7.1 Introduction
The leak detector is the instrument and the probe together.
This section of the operating manual consists of step by step examples on how to
calibrate the detector in the most common cases. For more about the calibration
routine, see the reference section.
The instrument must be calibrated by using the integrated calibration function to
make sure it displays the correct values in Measuring Mode. After calibration, the
instrument will show the correct measured values on the display in
Measuring Mode
and in Combined Mode . The calibration parameters will be stored in the probe.
7.2 Calibration Leak or Calibration Gas
There is a possibility to calibrate the detector by using Calibration Gas or a
Calibration Leak.
A Calibration Gas contains a well-defined concentration of Hydrogen gas mixed
with air. A Certificate will normally follow the gas bottles. Calibration Gas can be
ordered from local gas suppliers.
A Calibration Leak is a well–defined gas leak. The Calibration Leak should be fed by
the same gas used in the detection test and with a gas pressure defined in the
Calibration Leak certificate. Calibration Leak can be ordered from the detector
provider.
Choose a calibration leak or calibration gas size, as follows:
• Same or higher than the Reject Level (but maximum 10 times higher)
• In one of the following ranges:
5 to 400 ppm H
2
1x10 -5
to 4x10
-3
cc/s (mbarl/s) defined for air
3 to 120 g/yr defined for R134a
Please contact the provider of the detector for help to select optimal calibration
reference for your application.
7.3 Unit Conversion
When using flow units (other than “ppm” and “custom”), the instrument
automatically converts between the calibration unit and the measurement unit. The
conversion is saved in the Correlation value and is updated when Calibration Unit or
Measuring Unit is changed. Leak Gas and Displayed Gas will not change Correlation
Value, but will have effect on the measured figures.
If “ppm” or custom unit is chosen (Measuring or Calibration Unit), the Correlation
Value must be set by operator. To set Correlation Value go to menu General
Settings.
Correlation Value can be modified even otherwise.