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Model LXT-230 Instruction Manual / 5
Fahrenheit. A toggle function in the Temperature Calibration Menu allows this selection to
be performed in the field.
1.7 PID Output (Optional)
An optional PID output is available and provides a 4-20 mA, three-mode control signal to a
transducer or a final control element. Proportional band is adjustable from 0.1 to 1,000%.
Reset and Rate are adjustable from 0.00 to 100 repeats per minute and 0.00 to 1,000
minutes, respectively.
1.8 Dual Input (Optional)
An optional second input can be provided for pH, ORP, Dissolved Oxygen or Specific Ion.
This input can be used as a second analysis or as specific compensation for the primary
input. Temperature compensation for the secondary input (channel 2) is provided through
the primary input (channel 1).
1.9 Dual Output (Optional)
The standard LXT-230 is provided with a single output; however, the dual output option
provides a second output in either a 4-20 mA regenerated or a 4-20 mA PID format.
Outputs can be defined in pH, ORP, Specific Ion, Dissolved Oxygen or Temperature. The
second output is fully isolated from the inputs and the primary output and is "floating" so it
can have either a positive or negative common.
1.10 Three Outputs (Optional)
Because temperature is an input on the primary channel, TAI has made it available as a
third 4-20 mA output. The third output for the LXT-230 can only be a temperature output.
1.11 Optional Software
To enhance the capability of the LXT-230, other software options are available.
Among the options are:
1.11.1 Security Access
Allows only authorized personnel entry to calibration modes.
1.11.2 Differential Output
Provides an output expressed as the difference between two inputs.
1.11.3 Ratio Output
Provides an output expressed as the ratio of two inputs. This is applicable to percent
rejection in some applications.
1.11.4 Averaged Outputs
1. Provides an output expressed as the average of two inputs.
2. Provides a field selectable time average (2 to 32 seconds).
1.12 Identification
The full model number, as found on the packing slip, is a list of alphanumeric characters
used to designate certain features of the transmitter. See section 10.0 (Table 1) for the list
of designators used for the LXT-230.