<16. COMMISSIONING OF SENCOM pH/ORP>
16-4
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
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,” ve 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 conguration,” “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. coefcient
• 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.
n Temperature compensation
This compensation of pH value is performed on the Nernst equation.
Two methods can be used: Automatic and Manual. Select Automatic when a temperature
element is used, or select Manual when a manually set temperature is used.
NOTE
When Manual is selected on the Temperature compensation, a process temperature should
be set in the “Manual temp.” A temperature shown on the Main display is this manually set
temperature.
n Reference temperature
Set a reference temperature to which the measured pH value must be compensated. Normally
25°C is used, so this temperature is chosen as the default value.
To Next Page
Loading...
Need help?
General
