34 Installation Guide
Hydrogen settings
Accessing the Hydrogen settings dialog box requires the administrator password.
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Figure 18 Hydrogen settings dialog box
Level
The sensor is delivered with preset default values for warning and alarm levels. However, it is possible
to modify these default values. The default alarm and warning values are described in detail in
“Configuring alarm levels” on page 40.
Rate Of Change over 24h
The rate of change (RoC) is evaluated over a period of 24 hours to determine whether a warning is
issued or not. Default values are preconfigured but can be modified to suit specific applications (see
“Rate-of-Change (RoC) trigger level” on page 40 for more information).
Application configuration
The Application configuration section allows you to apply a correction to the sensor’s basic values.
The Slope applies a multiplier to the basic value (i.e., changing the default slope value from 1.0 to 1.1
multiplies a basic measurement of 100 ppm to 110 ppm).
The Bias adds to or subtracts from the basic value (i.e., changing the default bias value from 0.0 to -5.0
modifies the basic measurement from 100 ppm to 95 ppm).
Using the bias is a convenient way to reconcile minor differences between the sensor reading and the
off-line DGA lab results.
NOTICE
The slope and bias should be changed with care; it is not recommended to change
these values on a regular basis as it will distort results.
The alarm value setting can be modified to determine whether an alarm is issued or not.
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