Extended diagnostic functions
68 - EN FEX300, FEX500 CI/FEX300/FEX500-EN
8.1.3 Electrode coating detection
This function provides the opportunity to detect coatings on the measuring electrodes by using
an adjustable maximum limit value.
When the set 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:
• When using plastic tubes, install a grounding plate at the front and back of the device.
8.1.4 Conductivity monitoring
The conductivity of the fluid is monitored by using an adjustable minimum / maximum limit
value.
When the value falls below or exceeds the set limit value, 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
1)
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:
• When using plastic tubes, install a grounding plate at the front and back of the device.
• There must not be any deposits on the measuring electrodes.
1) The specified nominal diameter range is valid for ProcessMaster, only. The nominal diameter range valid for
HygienicMaster is DN 10 … 100 (3/8 “ ... 4 “).
8.1.5 Electrode impedance monitoring
The impedance between the electrode and ground is monitored by using a minimum / maximum
limit value. This enables the transmitter to detect an electrode fine short or leakage.
When the value falls below or exceeds the set limit value, 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
1)
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:
• When using plastic tubes, install a grounding plate at the front and back of the device.
• There must not be any deposits on the measuring electrodes.
• The measuring tube must always be completely full, and the fluid must feature only minor
conductivity variations.
To Next Page
Loading...
Need help?
General
