Entering The Cell Constant; Zeroing The Instrument; Calibrating The Sensor In A Conductivity Standard (In Process Cal) - Emerson Rosemount 1066 Instruction Manual

Section 9: Calibration
April 2017
The following sub-sections show the initial display screen that appears for
each calibration routine.
calibration at the end of
routine to complete calibration.
The adjacent screen appears after selecting Conductivity calibration:

Entering the Cell Constant

9.4.1
New conductivity sensors rarely need calibration. The cell constant
printed on the label is sufficiently accurate for most applications. The cell
constant should be entered:
• When the unit is installed for the first time
• When the probe is replaced
The display screen for entering a cell Constant for the sensor is shown. The default value is
displayed in bold type.

Zeroing the Instrument

9.4.2
This procedure is used to compensate for small offsets to the conductivity
signal that are present even when there is no conductivity to be
measured. This procedure is affected by the length of extension cable and
should always be repeated if any changes in extension cable or sensor
have been made. Electrically connect the conductivity probe as it will
actually be used and place the measuring portion of the probe in air. Be
sure the probe is dry.
The adjacent screen will appear after selecting Zero Cal from the
Conductivity Calibration screen:
The adjacent screen will appear if zero Cal is successful. The screen will
return to the conductivity Cal Menu.
The adjacent screen may appear if zero Cal is unsuccessful.
9.4.3 Calibrating the Sensor in a Conductivity Standard
(in process cal)
This procedure is used to calibrate the sensor and transmitter against a solution of known
conductivity. This is done by submerging the probe in the sample of known conductivity, then
adjusting the displayed value, if necessary, to correspond to the conductivity value of the sample. Turn
temperature correction off and use the conductivity of the standard. Use a calibrated thermometer to
measure temperature. The probe must be cleaned before performing this procedure.
The adjacent screen will appear after selecting In Process Cal from the
Conductivity Calibration screen:
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.
72
Use the flow diagram for Conductivity
Section 7 and the live screen prompts for each
Instruction Manual
LIQ-MAN-1066
1.234 µS/cm 25.0 ºC
SN Calibration
Zero Cal
In Process Cal
Meter Cal
Cell K: 1.00000/cm
1.234 µS/cm 25.0 ºC
SN Cell Constant
1.00000 /cm
1.234 µS/cm 25.0 ºC
SN Zero Cal
In Air
In Water
1.234 µS/cm 25.0 ºC
SN Zero Cal
Sensor Zero Done
1.234 µS/cm 25.0 ºC
SN Zero Cal
Sensor Zero Fail
Offset too high
Press EXIT
1.234 µS/cm 25.0 ºC
SN InProcess Cal
Wait for stable
reading.
Calibration