Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 187)

<16. COMMISSIONING OF SENCOM pH/ORP>
16-4
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
Make sure that “Enable” is selected before disconnecting the sensor. Until the removal, a bar
(----) is displayed for the measurement value, and the error message “SENCOM sensor is not
connected” appears on the display.
Upon connecting the sensor again, it automatically starts measurement and the Safe sensor
disconnection turns to “Disable.”
NOTE
Disconnect the SENCOM sensor after setting the Safe sensor disconnection to “Enable”.
Otherwise, the sensor may be damaged.
16.2 Measurement setup
This section describes how to set up various parameters relating to measurements.
Measurements are performed based on the measurement parameter setup.
For measurement setup, part of the menu structure of settable items changes depending on the
“Sensor type” selected in “16.1 Sensor setup.”
16.2.1 Measurement
If pH or ORP is selected in “Sensor type,” a measurement type does not need to be selected and
it is not displayed.
If “pH + ORP” is selected in “Sensor type,” five measurement types can be selected for the
“Measurement” item at the top of the Measurement setup screen. Select a suitable measurement
type for the application.
Moreover, associated items are added to parameters in “Error configuration,” “Display setup,”
etc.; check the setting condition of each item.
16.2.2 Temperature settings
When SENCOM sensors are connected, temperature elements for compensation are
automatically set.
Celsius (°C) or Fahrenheit (°F) temperature units are available. If the unit is changed, the
following values are also recalculated automatically to the new unit:
• Manual temp.
• Reference temp.
• Temp. coefficient
• Temp. ranges in the matrix
16.2.3 Temperature compensation
ORP measurement involves no temperature input. No setting is required on the temperature
compensation. Process temperature compensation is effective if “T.C. ORP mV/°C” in “Temp.
Coef.” is set.