INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 17)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
OP-Sensistor ISH2000-EN-201203 15
EN
7 Calibrate the leak detector
7.1 Introduction
The leak detector is the instrument and the probe together.
This section of the user manual consists of step by step examples about 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 Analysis Mode. After calibration the
instrument will show the correct measured values on the display in
Analysis Mode .
The calibration parameters will be stored into the probe.
7.2 Calibration reference
There is a possibility to calibrate the detector by Reference Gas or Reference Leak.
A Reference Gas contains a well-defined concentration of Hydrogen gas in ppm
mixed by air or some inert gas. A Certificate will normal follow the gas bottles.
Reference Gas can be ordered from local gas suppliers.
A Reference Leak is a well –defined gas leak, and should be feed by same gas as
using in the detection test and with a gas pressure that is defined in the Reference
Leak certificate. Reference Leak can be ordered from the detector provider.
Choose a calibration reference size, as follows recommendations:
• Same or higher than the Reject Level (but maximum 10 times higher)
• in one of the following ranges:
5 to 400 ppm H2
1x10-5 to 4x10-3 cc/s (mbarl/s) defined for air
3 to 120 g/a defined for R134a
Please contact the provider of the detector for help to select optimal calibration
reference for your application.
7.3 Calibration procedure
Before calibration, the Reference Value in the Calibration Menu must be set. See “With
reference gas” and “With reference leak” below.
When calibrating, expose the probe to the background air then do the following
steps:
1. First Menu then Calibration/Calibrate/Enter.
2. Push the
Start button or push the probe button.
3. Expose the probe for the reference gas/leak
The probe does not have to be exposed to the to the calibration gas during the
whole
Calibration Time (the time set in the Calibration menu while the bar is moving).
The instrument only measures the change as the probe goes from the background
air to calibration gas.
While the calibration time bar is moving, the probe should be exposed to the
calibration gas or referenece leak. Then the display shows
Detecting Gas and gives
sound signals. Save or repeat the calibration routine until you can save the