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Model LXT-230 Instruction Manual / 9
The top line displays the buffer, or calibration point, at which the last calibration was
performed. For pH transmitters, the bottom line displays the electrode slope, or efficiency,
in millivolts per pH (mV/pH). ORP transmitters express efficiency in absolute millivolts per
millivolt (mVa/mV). When in the calibrate mode, the bottom line displays the real-time, or
active, millivolt slope value.
3.2.6 Output Calibration Menu
Current output ranges are adjusted in this menu. The top line defines the 4 mA point, while
the bottom line defines the 20 mA point. Between these points, the output current is linear
with respect to the sensor input. By reversing the signs, the European convention or the
Thermodynamic (American) convention can be defined.
3.2.7 Temperature Calibration Menu
This Menu has two calibrate functions. It is used to adjust or trim the temperature
compensation for variations in the sensing element. This menu can also provide a manual
temperature input for the process. The top line displays the temperature offset value. The
bottom line displays the adjusted temperature value.
Second, the menu is used to change the units of display to either Celsius or Fahrenheit. The
change is performed as a toggle function and changes the displayed units on all screens or
menus where temperature is displayed to the desired unit of measurement.
_4 mA .00
20 mA 14.00
_4 mA -1000.0 mV
20 mA 1000.0 mV
Trim °C .0
Unit 24.3°C