ATI
PQ45P pH System
Part 5
– Operation
23
O&M Manual
Rev-B (7/15)
Select TC
This function allows the user to select either a Pt1000 or Pt100 platinum
RTD temperature element. The Pt1000 element is the standard element
in all high performance Q25 sensors; it is the recommended temperature
sensing element for all measurements. The Pt100 selection is for use
with the standard combination-style sensor. Press ENTER to initiate
user entry mode, and the entire value will flash. Use the UP arrow key to
modify the desired value. Press ENTER to store the new value.
Sensor Type
This function sets the sensor input type. This selection is critical for
control of the internal diagnostics and compensation factors. Press
ENTER to initiate user entry mode, and the entire value will flash. Use
the UP arrow key to modify the desired value. Selections are
1
for Q25P
glass sensor,
2
for the standard combination electrode,
3
for Q25P
antimony electrode, and
4
for pure water sensor using special
compensation table. Press ENTER to store the new value.
Auto Buffer
This is a multiple variable function that allows the user to choose which
pH buffer sets that will be utilized in the 2-point calibration mode. The
PQ45P contains 3 sets of built-in buffer tables with compensation values
ranging from 0 to 95 °C. During 2-point calibration, the instrument will
automatically identify which buffer is being used and compensate for the
value based on the built-in tables. This allows very quick, highly
accurate calibrations by the user. The order in which the buffers are
used during calibration is unimportant, since the system automatically
chooses the correct buffer.
The default setting for this feature is
OFF
, which disables the auto-
recognition function. Press ENTER to change this setting. The buffer
table set options are: 1: [4/7/10], 2: [4/7/9.18], and 3: [4.65/6.79/9.23].
See Figure 4-4 for buffer tables. Once the buffer set is selected, press
ENTER and the message
Accepted!
will be displayed on the lower line.
Out#2 Mode
This function sets analog output #2 for either temperature (default) or pH.
Press ENTER to initiate user entry mode, and the entire value will flash.
Use the UP arrow key to modify the desired value; selections include 1-
C/F for temperature or 2-pH for pH. Press ENTER to store the new
value.
Temp Units
This function sets the display units for temperature measurement. Press
ENTER to initiate user entry mode, and the entire value will flash. Use
the UP arrow key to modify the desired display value. The choices are
°F and °C. Press ENTER to store the new value.
