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DOTX-45 Dissolved Oxygen System Part 6 – Configuration

DOTX-45 39 -

and therefore, it is best in most cases to leave it at the

default value. Increasing this value will make the controller

more responsive.

AC POWERED UNITS ONLY

*Set 4 mA #2

*Set 20 mA #2

[temp/D.O.] These functions set the second 4 mA and 20 mA current

loop output points for the transmitter. The output may be set

to track temperature (default), PPM oxygen, or % Saturation.

The values stored for the 4 mA point may be higher or lower

than the value stored for the 20 mA point.

The entry value is limited to a value between 0 and 50 °C if it

is set for temperature, within the range specified in “Set

Range” if the output is set to track oxygen. The 4 mA and

the 20 mA point must be at least 20 units away from each

other. Press ENTER to initiate user entry mode, and the

value will flash. Use arrow keys to modify value. Press

ENTER to store the new value.

NOTE: If the temperature units are changed between °C and

°F (see Temp Units in this section), the default settings for

this output will be stored (present data is not converted.)

ALARM CONFIGURATIONS APPLY TO AC POWERED UNITS ONLY

*A Setpoint This function establishes the oxygen trip point for relay A.

The entry value is limited to a value within the range

specified in “Set Range”. Use the LEFT arrow key to select

the first digit to be modified. Then use the UP and LEFT

arrow keys to select the desired numerical value. Press

ENTER to store the new value.

*A Hysteresis This function establishes the hysteresis, or “deadband”, for

Relay A. Hysteresis is most often used to control relay

chattering; however, it may also be used in control schemes

to separate the ON/OFF trip points of the relay. Press

ENTER to initiate user entry mode, and the value will flash.

Use the arrow keys to modify value. Press ENTER to store

the new value.

*A Delay This function places an additional amount of time delay on

the trip point for relay A. This delay is in addition to the main

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