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Model LXT-230 Instruction Manual / 11
To file the input, with the microprocessor, exit the calibrate mode by pressing either menu
selection key. The upper half of the split screen menu displays absolute reference potential
(±2 millivolts) directly from the electrode via the diagnostic signal co conditioner located in
the sensor. This half of the menu is “read only” and cannot be accessed.
It is this half of the menu where you will observe the state of the electrode’s performance in
terms of process relates aging.
The mV LIMIT value, as set in by the user or TAI at time of shipment, may require
adjustment from process to process due to major chemical changes that would introduce
new electrolyte contaminants thereby impacting the rate of reference contamination in the
electrode.
After the desired mV values are set into the DIAGNOSTIC CALIBRATION SCREEN, further
electrode “INSITU” diagnostic information can be obtained by scrolling to the main process
menu where VISUAL electrode diagnostic information is displayed as a cursor/growing black
vertical bar. As process intrusion threatens the electrode’s internal balance, the bar
correspondingly grows in height (it will
eventually flash as a final pre-pHault alert).
The user can toggle between the main process screen and the dedicated diagnostic screen
where specific, real time DIAGNOSTIC engineering data can be obtained. There is also an
option (at time of purchase) to add a 4-20mA output card for the transmission of this
“INSITU” diagnostic engineering data.