ATI
Q45P pH System
Part 4
– Configuration
28
O&M Manual
Rev-B (7/15)
Set 2.5V #2
These functions set the output range for each of the two
instrument outputs. The value stored for the 0V point may
be higher or lower than the value stored for the 2.5V point.
The entry values are limited to values within 0.00 and 14.00
pH and 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.
Output #1 will always be in units of pH, as it is fixed to track
pH. Output #2 will be in either units of pH or C/F, depending
on whether pH or temperature is set for Out#2 in the
CONFIG menu.
4.12 Diagnostics Menu [DIAG]
The diagnostics menu contains all of the user settings that are specific to the
system diagnostic functions, as well as functions that aid in troubleshooting
application problems.
Set Hold
The Set Hold function locks the voltage output values on the
present process value. This function can be used prior to
calibration, or when removing the sensor from the process,
to hold the output in a known state. Once HOLD is released,
the outputs return to their normal state of following the
process input.
The transfer out of HOLD is bumpless on the both analog
outputs - that is, the transfer occurs in a smooth manner
rather than as an abrupt change. An icon on the display
indicates the HOLD state, and the HOLD state is retained
even if power is cycled. Press ENTER to initiate user entry
mode, and entire value will flash. Use the UP arrow key to
modify the desired value, selections are
ON
for engaging the
HOLD function, and
OFF
to disengage the function. Press
ENTER to store the new value.
Fault List
The Fault List screen is a read-only screen that allows the
user to display the cause of the highest priority failure.
The screen indicates the number of faults present in the
system and a message detailing the highest priority fault
present. Note that some faults can result in multiple
