Auto range, Direct sensitivity adjustment, Audio threshold – INFICON Sensistor ISH2000 HySpeed Hydrogen Leak Detector User Manual

Page 25: Reject indicator, Audio ready pulse, 6 analysis mode, To analyse leaks, Reject level, Analysis mode, To analyse leaks reject level

Hydrogen leak detector Sensistor ISH2000 HySpeed

Operating Instructions

OP-Sensistor ISH2000 HySpeed-EN-201203

Note:

This does not affect the

Analysis Mode

Auto Range

Set this parameter to

for auto ranging of sensitivity in

Detection Mode

. Sensitivity

will decrease two steps if the signal reaches full scale. Sensitivity is restored to
selected

Sensitivity

(See “To locate leaks” on page 24) when signal returns to zero.

Direct Sensitivity Adjustment

Setting this parameter to

OFF

will remove the sensitivity adjustment from the

Detection Mode

display. Sensitivity can still be adjusted in the

Sensitivity Settings

after entering password (if set).

Note:

The sensitivity setting only affects the

Detection Mode

Audio Threshold

Makes it possible to lower the sound to a set level in Detection Mode. The level is in
% of full Detection bar.

Reject Indicator

Makes it possible to show (not shown) the indication Reject in Detection Mode.

Audio Ready Pulse

This sets the standby sound to a silent or or pulsating tone.

8.6 Analysis mode

Analysis Mode

the measured value is displayed in figures. The default unit is in PPM

but it is possible to choose other units, See “Default parameters” on page 40.

To analyse leaks

The Analysis 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 remains on the display.

The period during which the measured value is displayed can be adjusted in the
Display Settings menu.

Reject level

Threshold level for Reject decisions. When this level has passed Reject it will be
indicated by audio and LED signals Reject on APC-bus high.