NORMAL OPERATION
Part. No. 2400M2501_6 Touchpoint Pro
120 Technical Handbook
14.5 Sensor Over Range Operation
TPPR can display a warning if an input signal exceeds the configured gas range. Two signals are provided:
Full Scale Exceeded
Over Range Warning
The Full Scale Exceeded warning is displayed, if enabled, when the gas reading exceeds the programmed range. The
warning is cleared automatically when the signal returns below 100% of the selected range.
The Over Range Warning is programmable. If enabled, the warning is displayed when the gas reading exceeds the
programmed level (default is 110% of the programmed range).
The Over Range Warning has a higher priority than the Full Scale Exceeded warning. If the Over Range Warning is
asserted, the Full Scale Exceeded warning is cleared.
14.5.1 Gas Readings
The maximum gas readings experienced may be seen by viewing the Trend graph.
14.6 Catalytic Sensor Over Range Operation
The reading from a catalytic sensor can return to a false low if the gas level exceeds the sensor operating range. The
latched Over Range Warning indicates that an exceptionally high gas level has been detected and further investigation is
required.
The Over Range Warning requires an extra Reset operation to clear. The first Reset clears the over range warning, the
second reset clears any other conditions, provided that gas readings have returned to suitably low levels.
The Over Range Warning is available on mV channels (default: enabled) and on mA channels (default: disabled) for use
with catalytic sensors connected via a mA transmitter.
14.7 Full Scale Exceeded and Over Range Warning Operation
The following two examples show the detailed operation of the Full Scale Exceeded and Over Range Warning warnings.
Note: For clarity alarms (AL1, AL2, AL3) and other conditions are not shown.
Pre-conditions:
Full Scale Exceeded is enabled and set to 100% of the pre-set gas range
Over Range Warning is enabled and set to 120% of the pre-set gas range (Latched)
The Over Range Warning parameter must be configured to 100 %FSD to ensure compliance with EN60079-29-1.
This signal must be configured to Latching to ensure compliance with EN60079-29-1.
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