Emerson Rosemount 1066, Instruction Manual

Page: 83 / 134

Instruction Manual Section 9: Calibration
LIQ-MAN-1066 April 2017
Calibration 73
The adjacent screen will appear if In Process Cal is successful. The screen
will return to the conductivity Cal Menu.
The adjacent screen may appear if In Process Cal is unsuccessful. The
screen will return to the conductivity Cal Menu.
Calibrating the Sensor To A Laboratory Instrument
(meter cal)
This procedure is used to check and correct the conductivity reading of the 1066 using a
laboratory conductivity instrument. This is done by submerging the conductivity probe in a bath
and measuring the conductivity of a grab sample of the same bath water with a separate
laboratory instrument. The 1066 reading is then adjusted to match the conductivity reading of the
lab instrument.
The adjacent screen will appear after selecting Meter Cal from the
Conductivity Calibration screen:
After pressing ENTER, the display shows the live value measured by the
sensor
If the meter cal is successful the screen will return to the conductivity Cal
Menu.
The adjacent screen will appear if Meter Cal is unsuccessful. The screen will
return to the conductivity Cal Menu.
Cal Factor
Upon initial installation and power up, if 4-electrode was selected for the
sensor type in the Quick Start menus, the user enters a Cell Constant and
a “Cal Factor” using the instrument keypad. The cell constant is needed to
convert measured conductance to conductivity as displayed on the
transmitter screen. The “Cal Factor” entry is needed increase the accuracy of the live conductivity
readings, especially at low conductivity readings below 20uS/cm. Both the Cell Constant and the
“Cal Factor” are printed on the tag attached to the 4-electrode sensor/cable.
9.4.4
9.4.5
1.234 µS/cm 25.0 ºC
S
N
InProcess Cal
Calibration
Error
Press EXIT
1.234 µS/cm 25.0 ºC
S
N
InProcess Cal
Updated cell
constant:
1.00135/cm
1.234 µS/cm 25.0 ºC
S
N
Meter Cal
Use precision
resistors only
1.234 µS/cm 25.0 ºC
S
N
Meter Cal
Calibration
Error
Press EXIT
1.234 µS/cm 25.0 ºC
S
N
Enter Value
xx.xx kΩ
1.234 µS/cm 25.0 ºC
S
N
Cal Factor
0
.95000 /cm