ATI
Q46H/65 Residual Chlorine Dioxide System
Part 6
– Configuration
43
O&M Manual
Rev-J (11/18)
Set 4 mA #1
These functions set the main 4 and 20 mA current loop #1 output points
Set 20 mA #1
for the analyzer when output 1 is in normal, non-PID, mode of operation.
[Iout1= ClO
2
]
The value stored for the 4 mA point may be higher or lower than the
value stored for the 20 mA point. The entry values are limited to values
within the range specified in “Set Range”, and the 4 mA and the 20 mA
point must be separated by at least 1% of this 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.
Set 4 mA #2
These functions set the second 4 mA and 20 mA current loop #2 output
Set 20 mA #2
points for the analyzer. The output may be set to track temperature
[temp/chlor/pH]
(default), pH, or ClO
2
. 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 55 °C if it is set for
temperature, within the range specified in “Set Range” if the output is set
to track ClO
2
, and must be within 0-14 pH if set to track pH. 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/ ClO
2
/pH]
track temperature (default), pH, or ClO
2
. 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 55 °C if it is set for
temperature, within the range specified in “Set Range” if the output is set
to track ClO
2
, and must be within 0-14 pH if set to track pH. 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.)
A Setpoint
This function establishes the ClO
2
trip point for relay A. The entry value
is limited to a value within the range specified in “SetRange”. 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.
