ATI
PQ45P pH System
Part 5
– Operation
22
O&M Manual
Rev-B (7/15)
Cal Temp
The temperature calibration function allows the user to adjust the offset
of the temperature response by a small factor of ±5°C. The temperature
input is factory calibrated to very high accuracy. However, long cable
lengths and junction boxes may degrade the accuracy of the temperature
measurement in some extreme situations. Therefore, this feature is
provided as an adjustment. See Part 5
– Calibration for more details.
4.84 Configuration Menu [CONFIG]
The Configuration Menu contains all of the general user settings:
Entry Lock
This function allows the user to lock out unauthorized tampering with
instrument settings. All settings may be viewed while the instrument is
locked, but they cannot be modified. The Entry Lock feature is a toggle-
type setting; that is, entering the correct code will lock the transmitter and
entering the correct code again will unlock it. The code is preset at a
fixed value. Press ENTER to initiate user entry mode and the first digit
will flash. Use arrow keys to modify value.
See end of manual for the
Q45H lock/unlock code.
Press ENTER to toggle lock setting once code
is correct. Incorrect codes do not change state of lock condition.
Set Delay
The delay function sets the amount of damping on the instrument. This
function allows the user to apply a first order time delay function to the
pH measurements being made. Both the display and the output value
are affected by the degree of damping. Functions such as calibration are
not affected by this parameter. The calibration routines contain their own
filtering and stability monitoring functions to minimize the calibration
timing. Press ENTER to initiate user entry mode, and the value will
flash. Use the arrow keys to modify value; range is 0.1 to 9.9 minutes.
Press ENTER to store the new value.
Contrast
This function sets the contrast level for the display. The custom display
is designed with a wide temperature range, Super-Twist Nematic (STN)
fluid.
The STN display provides the highest possible contrast and widest
viewing angle under all conditions. Contrast control of this type of
display is generally not necessary, so contrast control is provided as a
means for possible adjustment due to aging at extreme ranges. In
addition, the display has an automatic temperature compensation
network. Press ENTER to initiate user entry mode, and the value will
flash. Use arrow keys to modify the value; range is 0 to 8 (0 being
lightest). Press ENTER to update and store the new value.
Main
This function allows the user to change the measurement in the primary
Display
display area. The user may select between pH,
sensor temperature, or
output mV. Using this function, the user may choose to put temperature
in the main display area and pH on the secondary, lower line of the
display. Press ENTER to initiate user entry mode, and the entire value
will flash. Use the UP arrow key to modify the desired display value.
Press ENTER to store the new value.
