ATI
Q45C2 2E Conductivity System
Part 4 – Configuration
O & M Manual
Revision K (01/07)
- 34 -
Set Range
This function allows the User to set the displayed range of
the instrument. This selected range is also the display for all
other settings, such as relay setpoints, 4-20 mA output, etc.
Since the operating range of the Q45C2 is determined by the
cell constant of the sensor used, the following ranges are
available based on the selected setting in
Cell Const
in the
Calibration Menu [CAL]:
AC POWERED UNITS ONLY
*Set 4 mA #2
*Set 20 mA #2
[temp/conductivity] 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), or conductivity. 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 110°C if
it is set for temperature, within the range specified in “Set
Range” if the output is set to track conductivity. 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.)
NOTE:
If the battery board option is installed, the menu will
be shown as
Set 0 V #2
– since the battery board has two 0-
2.5 VDC voltage output signals instead of current outputs.
ALARM CONFIGURATIONS APPLY TO AC POWERED UNITS ONLY
*A
Setpoint
This function establishes the chlorine 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
