ATI Q46D Dissolved Oxygen System Part 6 - Configuration
36
O&M Manual
Rev-N (4/21)
arrow keys to select the desired numerical value. Press ENTER to store
the new value.
*Set 4 mA #2 These functions set the second 4 mA and 20 mA current loop output
*Set 20 mA #2 points for the transmitter. The output may be set to track temperature
[temp/D.O.] (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.)
*Set 4 mA #3 OPTIONAL These functions set the optional third 4 mA and 20 mA
*Set 20 mA #3 current loop output points for the analyzer. The output may be set to
[temp/D.O.] track temperature (default) or D.O. The values stored for the 4mA 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 55 °C if it is set for
temperature. 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.
*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 delay setting for the
controller. The entry value is limited to a value between 0 and 999
seconds. Press ENTER to initiate user entry mode, and the value will
flash. Use arrow keys to modify value; range is 0 to 999 seconds. Press
ENTER to store the new value.
*A Phasing This function establishes the direction of the relay trip. When phase is
HI, the relay operates in a direct mode. Therefore, the relay energizes
and the LCD indicator illuminates when the oxygen value exceeds the
setpoint. When the phase is LO, the relay energizes and the LCD
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