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below, further settings can be made, between which you can switch by pressing the <ENTER> key.
The setting options for the respective sub-item can be changed in the line below.
The following settings can be edited:
7.3.1.a Lower Limit
Gives the user the possibility to set the lower limit of the alarm in the unit of measurement used (e.g.
Vol % or ppm). When the limit value is exceeded, the alarm is triggered. The selection of the limit
value is independent of the measuring range used. With <RIGHT> the digits of the setting value can
be selected and edited with <ENTER>.
7.3.1.b Upper Limit
Gives the user the possibility to set the upper limit of the alarm in the measuring unit used (e.g. Vol %
or ppm). If the value falls below the limit value, the alarm is triggered. The selection of the limit value
is independent of the measuring range used. With <RIGHT> the digits of the setting value can be
selected and edited with <ENTER>.
If you only need one of the limit values, you can simply set the other limit value to a
sufficiently distant value so that triggering at the limit value not required in your process
is no longer possible. Please note that displayed measured values can also become
negative under certain circumstances. This is the case for a gas concentration determined
by means of thermal conductivity if you feed a gas into the device which has a lower
thermal conductivity than the carrier gas for which the device is set up (e.g. if you feed
CO2 into a device which is set up for H2 in N2).
7.3.1.c Hysteresis
In order to avoid frequently changing switch-on and switch-off processes of relays at an alarm limit
value, a hysteresis value can be set. The setting is made in the measuring unit used (e.g. Vol % or
ppm). In the FTC320 the hysteresis is implemented in such a way that an increasing measured value
at [Upper Limit] + [Hysteresis] leads to triggering of the alarm at the upper limit and only switches off
again when the measured variable has fallen to a value lower than [Upper Limit] - [Hysteresis].
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf
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