O Calibrate The Sensor In A Conductivity Standard (In Process Cal) - Emerson Rosemount 1056 Instruction Manual

Instruction Manual
LIQ-MAN-1056
7.5.2 Entering The Cell Constant
New conductivity sensors rarely need calibration. The
cell constant printed on the label is sufficiently accurate
for most applications.
entered:
• When the unit is installed for the first time
• When the probe is replaced
• During troubleshooting
This procedure sets up the analyzer for the probe type
connected to the analyzer. Each type of probe has a
specific cell constant:
The display screen for entering a cell constant for the
sensor is shown. The default value is displayed in bold
type.
7.5.3 zeroing The Instrument
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.
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.
7.5.4 Calibrating The Sensor In A Conductivity
Standard (In Process Cal)
This procedure is used to check and correct the
conductivity reading of the Model 1056 to ensure that
the reading is accurate. 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. The probe must be
cleaned before performing this procedure. The temper-
ature reading must also be checked and standardized if
necessary, prior to performing this procedure.
The adjacent screen will appear after selecting In
Process Cal from the Conductivity Calibration screen:
The cell constant should be
S1: 1.234µS/cm
S2: 12.34pH
SN Cell Constant
3.00000 /cm
S1: 1.234µS/cm
S2: 12.34pH
SN Zero Cal
In Air
In Water
S1: 1.234µS/cm
S2: 12.34pH
SN Zero Cal
Sensor Zero Done
.
S1: 1.234µS/cm
S2: 12.34pH
SN Zero Cal
Sensor Zero Fail
Offset too high
Press EXIT
S1: 1.234µS/cm
S2: 12.34pH
SN InProcess Cal
Wait for stable
reading.
Section 7.0: Calibration
April 2017
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