INFICON Sensistor ISH2000P Hydrogen Leak Detector, Panel Model - Manual (Page 16)

Hydrogen leak detector Sensistor ISH2000 - Operating Instructions
14 OP-Sensistor ISH2000-EN-201203
EN
Hint: It is good practice to detect a leak, locate it, and immediately remove the probe
to avoid saturation. The probe is not damaged by the exposure but it will recover more
slowly. After excessive exposure it will be less sensitive for a short period of time.
6.3 To Quantify Leaks
The Analysis Mode (or use the analysis figures in Combined Mode) is used for
measuring the size of a leak (or the concentration of a gas sample). To be able to do
this measurement and obtain correct values, the instrument must first be calibrated
using the calibration function.
In the Analysis Mode the detector determines the gas concentration from the
change, as the probe goes from being exposed to background to being exposed to a
certain gas concentration. The detector does not continuously monitor the gas
concentration but takes just one reading instead. Another suitable alternative name
for this mode could be Sampling Mode. It is important to keep this in mind when using
the detector in this mode.
In Analysis Mode the probe should be moved directly from a background situation to
the test point. The size of the leak in PPM, or any other selected units, is shown on the
display. The probe can and should be removed from the measuring point as the
measured value steadies and remains on the display. The period during which the
measured value is displayed can be adjusted in the Analysis Mode Settings menu.
The leak detector operates in the range 0.5 - 2000 ppm H
2
giving linearity between 0.5
and 500 ppm. To obtain greatest accuracy over this range, follow the calibration
recommendation. See “Calibrate the leak detector” on page 17.
CAUTION!
• Do not open detector! Service of this equipment may only be carried out by ser-
vice organisations authorised therefore by INFICON, Sweden.
• If the detector gets outer damage it must be controlled and repaired by service
organisation authorised by INFICON.
• Do not expose the probe to a hydrogen concentration higher than 0.1% when
the instrument is not put into operation, this might damage or destroy the probe
sensor.
• When the instrument is put into operation the sensor withstands temporary
exposure to hydrogen concentration up to 100%. Avoid long exposures to high
concentrations.