Extended diagnostic functions
OI/FEX300/FEX500-EN FEX300, FEX500 129
8 Extended diagnostic functions
8.1 General
Important (Notice)
• The extended diagnostic functions are available for ProcessMaster 500 and
HygienicMaster 500, only.
• The "TFE Detector" function is not
available for HygienicMaster 500.
• When using the extended diagnostic functions the external flowmeter sensor must not be
provided with a preamplifier.
8.1.1 Detection of partial filling
Optionally, a measuring electrode (TFE electrode) is available for detecting a partially filled
flowmeter sensor. The alarm for partial filling is output via the programmable digital output.
Conditions for using the function:
• Nominal diameter from DN 50 (2“)
• Max. signal cable length for version with external transmitter 200 m (656 ft).
• Conductivity of the fluid: 20 μS/cm ... 20,000 μS/cm
• The function is only available for ProcessMaster 300 / 500 without explosion protection or
with explosion protection for Zone 2 / Div 2.
Additional installation conditions:
• The flowmeter sensor must be installed horizontally with the terminal box pointing upward.
8.1.2 Detection of gas bubbles
1)
Gas bubbles in the fluid are detected by using an adjustable maximum limit value. When this
limit value is exceeded, an alarm is tripped via the programmable digital output, depending on
the configuration.
Conditions for using the function:
• This function is available in the nominal diameter range
2)
of DN 10 … 300 (3/8 “ ... 12 “).
• The signal cable length of the external transmitter must not exceed a maximum value of
50 m (164 ft) .
• For this function, the conductivity of the fluid must be in the range
20 μS/cm ... 20,000 μS/cm.
Additional installation conditions:
• The flowmeter sensor can be installed either horizontally or vertically. Vertical installation is
preferred.
1) At present, the function is only available for devices without explosion protection or with explosion protection for
Zone 2 / Div. 2. For devices in Zone 1 / Div. 1 this function is under preparation (the function is already implemented
in the software, but cannot be used for devices in Zone 1 / Div. 1).
2) The specified nominal diameter range is valid for ProcessMaster, only. The nominal diameter range valid for
HygienicMaster is DN 10 … 100 (3/8 “ ... 4 “).
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