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:
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. The cell constant should be
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.
S1: 1.234µS/cm 25.0ºC
S2: 12.34pH 25.0ºC
S
N
Cell Constant
3
.00000 /cm
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:
S1: 1.234µS/cm 25.0ºC
S2: 12.34pH 25.0ºC
S
N
Zero Cal
In Air
In Water
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.
S1: 1.234µS/cm 25.0ºC
S2: 12.34pH 25.0ºC
S
N
Zero Cal
Sensor Zero Fail
Offset too high
Press EXIT
S1: 1.234µS/cm 25.0ºC
S2: 12.34pH 25.0ºC
S
N
Zero Cal
Sensor Zero Done
S1: 1.234µS/cm 25.0ºC
S2: 12.34pH 25.0ºC
S
N
InProcess Cal
Wait for stable
reading.
Instruction Manual
LIQ-MAN-1056
Section 7.0: Calibration
April 2017
Summary of Contents for Rosemount 1056
Page 4: ...Quick Start Guide Figure A Quick Start Guide ...
Page 5: ...Quick Reference Guide Figure B Model 1056 Menu Tree ...
Page 28: ...20 Instruction Manual LIQ MAN 1056 Section 2 0 Installation April 2017 ...
Page 50: ...42 Instruction Manual LIQ MAN 1056 Section 6 0 Programming the Measurements April 2017 ...
Page 84: ...76 Instruction Manual LIQ MAN 1056 Section 6 0 Programming the Measurements April 2017 ...
Page 122: ...114 Instruction Manual LIQ MAN 1056 Section 7 0 Calibration April 2017 ...
Page 124: ...116 Instruction Manual LIQ MAN 1056 Section 8 0 Return of Material April 2017 ...