ATI
PQ45P pH System
Part 5
– Operation
21
O&M Manual
Rev-B (7/15)
4.82 Measure Menu [MEASURE]
The default menu for the system is the display-only menu MEASURE. This menu is a display-only
measurement menu, and has no changeable list items. When left alone, the instrument will
automatically return to this menu after approximately 30 minutes. While in the default menu, the
UP arrow allows the user to scroll through the secondary variables on the lower line of the
display. A brief description of the fields in the basic transmitter version is as follows:
TRANSMITTER MEAS SCREENS:
25.7°C
Temperature display. Can be displayed in °C or °F, depending on user selection. A small
“m” on the left side of the screen indicates the transmitter has
automatically jumped to a manual 25°C setting due to a failure with the
temperature signal input.
+132 mV
Raw sensor voltage. Useful for diagnosing problems.
2.5V
Transmitter output voltage.
Slope = 100%
Sensor output response vs. ideal calibration. This value updates after
each calibration. As the sensor ages, the slope reading will decay
indicating sensor aging. Useful for resolving sensor problems.
Offset = 0.0 mV
Sensor output current at a zero input. This value updates after a zero-
calibration has been performed. Useful for resolving sensor problems.
Q45P v2.07
Transmitter software version number.
Note: A display test (all segments ON) can be actuated by pressing and
holding the ENTER key while viewing the model/version number on
the lower line of the display.
The MEASURE screens are intended to be used as a very quick means of looking up critical
values during operation or troubleshooting.
4.83 Calibration Menu [CAL]
The calibration menu contains items for frequent calibration of user parameters. There are four
items in this list; Cal pH, Cal Temp, and Set Range.
Cal pH
This function will be displayed in the menu listing. This specific function
selects whether a 1 or 2 point method is to be used for the pH sensor
calibration. The selection value in this menu determines how many pH
points the user intends to calibrate. For on-line calibrations where the
sensor will not be removed and only adjusted, select a 1-point
calibration. For calibration in two different buffer solutions and for all
first-time calibrations, choose a 2-point calibration. See Part 5
Calibration for more details.
