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Dissolved Oxygen Controller Introduction
Teledyne Analytical Instruments 15
• PID Output: An optional PID output is available and provides a
4-20 mA, three-mode control signal. 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. The PID output can be assigned and configured to
any of the available outputs.
• Multiple Output: The standard LXT-220 DO Controller is
provided with a single output. With the multiple output option,
up to four additional outputs can be added. These outputs can be
defined in the field as the process variable (DO, pH, ORP,
resistivity, conductivity), temperature, or PID. The additional
outputs are fully isolated from the inputs and the primary output
and are "floating" so they can have either a positive or negative
common.
Note: These isolated outputs are floating and require an external
24 VDC power source to operate. TI/AI can supply an
internal 24 VDC power supply to power these outputs.
Contact the factory for additional information.
• Alarm Relays: Up to six alarm or control relays are available for
the primary channel, or divided between the two channels on
dual output transmitters. Relay outputs can be field configured as
high or low alarms. Hysteresis (dead band) is defined by setting
the "ON" and "OFF" relay values. The relays can be configured
to any of the input parameters.
• HART Output: This option provides both digital and analog
outputs that is useful for monitoring and controlling process
variables in a multiple output instrument.
• Optional Software
Differential Output: Provides an output expressed as the
difference between two inputs.
Ratio Output: Provides an output expressed as the ratio of two
inputs. This is applicable to percent rejection in some
applications.
Averaged Output: Provides an output expressed as the average
of two inputs.