SI Analytics handylab pH LF 12 Operating Manual
ba75370e01 12/2002
Operating manual
ba75370e
handylab pH/LF 12
AR
O
RCL
STO
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
M
pH/Conductivity measuring instrument
Accuracy when
going to press
The use of advanced technology and the high quality standard of our
instruments are the result of continuous development. This may result
in differences between this operating manual and your instrument.
Also, we cannot guarantee that there are absolutely no errors in this
manual. Therefore, we are sure you will understand that we cannot
accept any legal claims resulting from the data, figures or descriptions.
Warranty We guarantee the instrument described for 3 years from the date of
purchase.
The instrument warranty covers manufacturing faults that are discovered within the warranty period. The warranty does not cover components that are replaced during maintenance work, e.g. batteries.
The warranty claim extends to restoring the instrument to readiness for
use but not, however, to any further claim for damages. Improper
handling or unauthorized opening of the instrument invalidates any
warranty claim.
Copyright
© Mainz, Schott-Geräte GmbH, 2002
Reproduction in whole - or even in part - is prohibited without the
express written permission of Schott-Geräte GmbH, Mainz.
Printed in Germany.
handylab pH/LF 12 Contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 General features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Jack field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Operating structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 14
3 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Switching on the measuring instrument . . . . . . . . . . . . . 17
4.2 pH value / ORP voltage . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 Measuring the pH value . . . . . . . . . . . . . . . . . . 20
4.2.3 Measuring the ORP voltage . . . . . . . . . . . . . . . 22
4.3 pH calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4 Conductivity/Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4.1 General information . . . . . . . . . . . . . . . . . . . . . . 35
4.4.2 Measuring the conductivity . . . . . . . . . . . . . . . . 37
4.4.3 Measuring the salinity . . . . . . . . . . . . . . . . . . . . 37
4.4.4 AutoRead AR (drift control) . . . . . . . . . . . . . . . . 38
4.4.5 Determining the cell constant (Calibration in the
control standard) . . . . . . . . . . . . . . . . . . . . . . . . 39
4.4.6 Setting the temperature compensation . . . . . . . 42
4.5 Calibration intervals (Int 3, Int 5) . . . . . . . . . . . . . . . . . . 46
4.6 Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6.1 Saving manually . . . . . . . . . . . . . . . . . . . . . . . . 47
4.6.2 Switching on AutoStore (Int 1) . . . . . . . . . . . . . 49
4.6.3 Outputting the data storage . . . . . . . . . . . . . . . . 51
4.6.4 Clearing the memory . . . . . . . . . . . . . . . . . . . . . 56
4.7 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.7.1 Data transmission interval (Int 2) . . . . . . . . . . . 57
4.7.2 PC/external printer (RS232 interface) . . . . . . . . 58
4.7.3 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.8 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Contents handylab pH/LF 12
4
4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5 Maintenance, cleaning, disposal . . . . . . . . . . . . . . . . . 67
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.1 pH system messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.2 Conductivity system messages . . . . . . . . . . . . . . . . . . . 71
6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
handylab pH/LF 12 Overview
5
1Overview
1.1 General features
This compact precision handheld meter enables you to carry out pH /
ORP measurements and conductivity measurements rapidly and reliably.
The handheld meter provides the maximum degree of operating comfort, reliability and measuring certainty for all applications.
The proven MultiCal
®
calibration procedures or the proven procedure
for adjusting or setting the cell constant and the special AutoRead function support you in your work with the handheld meter.
1 Keypad
2 Sample display
3 Jack field
AR
O
RCL
STO
C
A
L
AR
S
/
cm
Tref25
nLF
0
5
2
3
0
5
°
C
TP
M
1
2
3
Overview handylab pH/LF 12
6
1.2 Keypad
Key functions
M
CAL
STO
RUN/ENTER
AR
RCL
Select the measured variable <M>:
– pH value / ORP voltage
– Conductivity / salinity
Save a measured value
<STO>
Switch measuring instrument on/off
<ON/OFF>
Calibrate the currently set measured variable
<CAL>
Display/transmit measured values
<RCL>
Activate/deactivate the AutoRead function
<AR>
Select the measuring mode, increase values,
scroll <
>
Select the measuring mode, decrease values,
scroll <
>
Confirm entries, start AutoRead
<RUN/ENTER>
M
STO
CAL
RCL
AR
RUN/ENTER
handylab pH/LF 12 Overview
7
1.3 Display
1.4 Jack field
1 Conductivity measuring cell
2 pH electrode
3 pH temperature probe
4 Plug-in power supply (optional)
5 Serial interface RS 232
Sal
S
mg/l
M
cm
%
mbar
O
°
F
TDS
Time
Baud
Day.Month No.
Ident
Year
8
8.
8
8
8
8
°
C
LoBat
1
UpH
RCL
Auto
Store
ARng
AR
S/
m
AutoCal DIN
AutoCalTEC
cm
Lin
Tref25
Tref20
nLF
Cal
mV/pH
Sal
1/
cm
/
K
%
TP
Status display
Meas. value display
Function and
temperature display
Probe symbol
5
123
4
Overview handylab pH/LF 12
8
1.5 Operating structure
The following overview diagram shows which keys you have to press
to select between the different measuring modes:
Note
When connecting a conductivity measuring cell with temperature
probe, the measuring instrument recognizes the probe and automatically switches to the last selected conductivity measuring mode. As
soon as the probe is disconnected, the instrument switches to the pH
or ORP measuring mode.
handylab pH/LF 12 Overview
9
1.6 Technical data
Dimensions
and weight
Mechanical
structure
Electrical
safety
Test certificates
Ambient
conditions
pH/ORP measuring
ranges
Precision of
pH/ORP
(± 1 digit)
pH correction function
Length [mm] 172
Width [mm] 80
Height [mm] 37
Weight [kg] approx. 0.3
Type of protection IP 66
Protective class III
GS, cETLus, CE
Storage - 25 °C ... + 65 °C
Operation -10 °C ... + 55 °C
Relative atmospheric
humidity
annual average < 90 %
Measuring range Resolution
pH - 2.00 ... + 19.99 0.01
U [mV] - 1999 ... + 1999 1
T [°C] - 5.0 ... + 105.0 0.1
pH (after calibration) ± 0.01
U [mV] ± 1
T [°C] ± 0.1
Temperature input
Manually [°C] - 20 ... + 130
Overview handylab pH/LF 12
10
Measuring ranges of
conductivity
Precision of
conductivity (± 1 digit)
Cell constant,
calibrating
Reference
temperature of
conductivity
Measuring range Resolution
[µS/cm] 0 ... 1999 1
[mS/cm] 0.00 ... 19.99
0.0 ... 199.9
0 ... 500
0.01
0.1
1
SAL 0.0 ... 70.0 accord-
ing to the IOT table
0.1
T [°C]
− 5.0 ... + 105.0 0.1
Nonlinear compensation :
Precision Sample temperature
± 0.5 % 0 °C ... 35 °C
according to EN 27 888;
± 0.5 % 35 °C ... 50 °C
extended nLF function
Linear compensation
Accuracy Sample temperature
± 0.5 % 10 °C ... 75 °C
(The accuracy percentage always refers to
the measured value.)
SAL Range 0.0 ... 42.0
Accuracy Sample temperature
± 0.1 5 °C ... 25 °C
± 0.2 25 °C ... 30 °C
T [°C] ± 0.1
C [cm-1] 0.450 ... 0.500
Tref Can be set to 20 °C or 25 °C
handylab pH/LF 12 Overview
11
Serial
interface
Automatic switchover if a PC or printer is connected.
Power
supply
Type RS232, data output
Baud rate Selectable 1200, 2400, 4800, 9600 baud
Data bits 8
Stop bit 2
Parity None
Handshake RTS/CTS + Xon/Xoff
Cable length Max. 15 m
Batteries 4 x 1.5 V alkali-manganese batteries, Type
AA
Operational life approx. 3000 operating hours
Mains The following applies to all plug-in power
supplies:
Connection max. overvoltage category II
Plug-in power supply with Euro plug:
FRIWO FW1199, 11.7864
Friwo Part. No. 1762613
Input: 230 V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
Plug-in power supply with US plug:
FRIWO FW1199, 11.7880
Friwo Part. No. 1794043
Input: 120 V ~ / 60 Hz / 6 VA
Output: 12 V = / 150 mA
Plug-in power supply with UK plug:
FRIWO FW1199, 11.7872
Friwo Part No. 1816491
Input: 230V ~ / 50 Hz / 5.6 VA
Output: 12 V = / 130 mA / 1.56 VA
Overview handylab pH/LF 12
12
Applicable
guidelines and norms
EMC EEC guideline 89/336/EEC
EN 61326-1:1997
EN 61000-3-2:1995 + pr A14:2000
EN 61000-3-3:1995
FCC Class A
Instrument safety EG guideline 73/23/EEC
EN 61010-1 A2:1995
Climatic class VDI/VDE 3540
Type of protection EN 60529:1991
handylab pH/LF 12 Safety
13
2 Safety
This operating manual contains basic instructions that you must follow
during the commissioning, operation and maintenance of the measuring instrument. Consequently, all responsible personnel must read this
operating manual before working with the measuring system. The operating manual must always be available within the vicinity of the measuring system.
Target group The measuring instrument was developed for work in the field and in
the laboratory.
We assume that, as a result of their professional training and experience, the operators will know the necessary safety precautions to take
when handling chemicals.
Safety instructions The individual chapters of this operating manual use the following safe-
ty labels to indicate various types of danger:
Warning
indicates instructions that must be followed precisely in order to avoid
the possibility of slight injuries or damage to the instrument or the environment.
Further notes
Note
indicates notes that draw your attention to special features.
Note
indicates cross-references to other documents, e.g. operating manuals.
2.1 Authorized use
The authorized use of the measuring instrument consists exclusively of
the pH and ORP measurement or the measurement of the conductivity
and salinity in the field and laboratory.
The technical specifications as given in section 1.6 T
ECHNICAL DATA
must be observed. Only the operation and running of the measuring
instrument according to the instructions given in this operating manual
is authorized.
Any other use is considered to be unauthorized.
Safety handylab pH/LF 12
14
2.2 General safety instructions
This instrument is built and inspected according to the relevant guidelines and norms for electronic measuring instruments (see
section 1.6 T
ECHNICAL DATA).
It left the factory in a safe and secure technical condition.
Function and operating
safety
The smooth functioning and operational safety of the measuring instrument can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are
followed during operation.
The smooth functioning and operational safety of the measuring instrument can only be guaranteed under the environmental conditions that
are specified in chapter 6 W
HAT TO DO IF....
If the instrument was transported from a cold environment to a warm
environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the
instrument reaches room temperature before putting the instrument
back into operation.
Safe operation If safe operation is no longer possible, the instrument must be taken out
of service and secured against inadvertent operation!
Safe operation is no longer possible if the measuring instrument:
l has been damaged in transport
l has been stored under adverse conditions for a lengthy period of
time
l is visibly damaged
l no longer operates as described in this manual.
If you are in any doubt, please contact the supplier of the instrument.
Obligations of the pur-
chaser
The purchaser of the measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:
l EEC directives for protective labor legislation
l National protective labor legislation
l Safety regulations
l Safety datasheets of the chemical manufacturers.
handylab pH/LF 12 Commissioning
15
3 Commissioning
3.1 Scope of delivery
l handylab pH/LF 12 handheld meter
l Operating manual and short operating manual
l 4 batteries, 1.5 V Mignon type AA (in the instrument)
3.2 Initial commissioning
Perform the following activities:
l Set the date and time
l Connect the plug-in power supply (optional)
Setting the date and
time
1 Press the <M> key and hold it down.
2 Press the <ON/OFF> key.
The display test appears briefly on the display.
3 Press the <RUN/ENTER> key repeatedly until the date ap-
pears on the display.
4 Set the date of the current day with <
> <>.
5 Confirm with <RUN/ENTER>.
The date (month) flashes in the display.
6 Set the current month with <
> <>.
7 Confirm with <RUN/ENTER>.
The year appears on the display.
8 Set the current year with <
> <>.
9 Confirm with <RUN/ENTER>.
The hours flash on the display.
10 Set the current time with <
> <>.
11 Confirm with <RUN/ENTER>.
The minutes flash on the display.
12 Set the current time with <
> <>.
13 Confirm with <RUN/ENTER>.
The instrument switches to a measuring mode.
Commissioning handylab pH/LF 12
16
Connecting the original
plug-in power supply
unit
You can either operate the measuring instrument with batteries or with
the plug-in power supply. The plug-in power supply supplies the measuring instrument with low voltage (12 VDC). This saves the batteries.
Warning
The line voltage at the operating site must lie within the input voltage
range of the original plug-in power supply (see section 1.6 T
ECHNICAL
DATA).
Warning
Use original plug-in power supplies only (see
section 1.6 T
ECHNICAL DATA).
1 Plug the jack (1) into the socket (2) of the measuring instru-
ment.
2 Connect the original SCHOTT plug-in power supply (3) to an
easily accessible mains socket.
2
1
3
handylab pH/LF 12 Operation
17
4 Operation
4.1 Switching on the measuring instrument
Measuring mode when
switching on
Note
The measuring instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the
measuring instrument off if no key has been pressed for an hour.
The energy saving feature is not active
l if the power is supplied by the plug-in power supply,
l if the AutoStore function is active,
l if the communication cable and a PC with a running communication
program are connected,
l if the printer cable is connected (for external printers).
1 Press the <ON/OFF> key.
The display test appears briefly on the display.
After this, the measuring instrument automatically switches to
the measuring mode.
Connected sensor Measuring mode
No sensor or pH/ORP electrode pH or ORP measurement (de-
pending on the last setting)
Conductivity measuring cell Last selected measuring mode
2 sensors Last selected measuring mode
Operation handylab pH/LF 12
18
4.2 pH value / ORP voltage
4.2.1 General information
Preparatory activities Perform the following preparatory activities when you want to measure:
Note
Incorrect calibration of pH electrodes leads to incorrect measured values. Calibrate regularly before measuring. You can only connect electrodes of the NTC30 type or without temperature probe.
Warning
When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232
interface is not galvanically isolated.
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
2 Adjust the temperature of the buffer solutions or test solutions,
or measure the current temperature, if you measure without a
temperature probe.
3 Calibrate or check the measuring instrument with the elec-
trode.
4Using <
> <>, toggle between the pH or mV measuring
modes.
handylab pH/LF 12 Operation
19
Temperature measure-
ment in pH measure-
ments
You can perform pH measurements with or without a temperature
probe as well as with the temperature probe of a conductivity measuring cell. The measuring instrument recognizes which sensors are connected and automatically switches to the correct mode for the
temperature measurement.
The following cases are distinguishable.
* If you do not wish that, you can:
– either disconnect the 2nd sensor and use the manual temperature
input or
– use an electrode with a temperature probe.
If a temperature probe is connected, it is indicated on the display by TP.
Note
When calibrating without a temperature probe (no TP display indicator
displayed), enter the current temperature of the respective buffer solution manually using the <
> <> keys while keeping the
<RUN/ENTER> key depressed.
Temperature probe Display Mode
pH Cond
yes - TP Automatic with
pH temperature probe
yes yes TP
- - Manual
-yesTP
flashes
The temperature value of the
2nd sensor (Cond) in the
same test sample is used for
the pH measurement*
Operation handylab pH/LF 12
20
4.2.2 Measuring the pH value
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the measurement signal. The stability has a considerable impact on the reproducibility of the measured values.
For identical measurement conditions, the following criteria apply:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3 Press the <> <> keys until pH appears in the status display.
The pH value appears on the display.
4 When measuring without a connected temperature probe:
Options:
l Determine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, enter this temperature value with <
> <>.
l TP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Cond) and immerse it in the
same test sample. TP flashes, the temperature is automatically measured using the second probe.
Tref20
Lin
Cal
8
1
S
SalOU
%
mg/l
mV/pH
1/
cm
Sal
AutoCal DIN
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
TDS
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
9
9
6
°
C
TP
pH
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <M> and <> <> .
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
handylab pH/LF 12 Operation
21
Note
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
This measured value is transmitted to the interface.
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
5 To terminate the AutoRead function: Press the <AR> key.
Operation handylab pH/LF 12
22
4.2.3 Measuring the ORP voltage
In conjunction with an ORP electrode, e.g. BlueLine 31Rx, the measuring instrument can measure the ORP voltage (mV) of a solution.
Note
ORP electrodes are not calibrated. However, you can check ORP electrodes using a test solution.
1 Perform the preparatory activities according to section 4.2.1.
2 Submerse the ORP electrode in the sample.
3 Press the <> <> keys until the U status display appears.
The ORP voltage (mV) of the test sample appears on the display.
4 Wait for a stable measured value.
/pH
Tref20
Cal
8
TDS
S
8
1
pH
SalO
%
mg/l
1/
cm
Sal
AutoCal DIN
Lin
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
2
3
°
C
TP
U
mV
handylab pH/LF 12 Operation
23
4.3 pH calibration
Why calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope
of the pH electrode. As a result, an inexact measured value is displayed. Calibration determines the current values of the asymmetry
and slope of the electrode and stores them in the measuring instrument. Thus, you should calibrate at regular intervals.
When to calibrate?
l After connecting another electrode
l When the sensor symbol flashes
– (after the calibration interval has expired)
– after a voltage interruption, e. g. after changing the batteries
You can select one of 3 calibration procedures:
AutoCal TEC is specially matched to the SCHOTT technical buffer solutions as a fully
automatic two-point calibration. The buffer solutions are automatical-
ly recognized by the measuring instrument. Depending on the instrument setting (see section 4.8 C
ONFIGURATION), the instrument displays
the relevant buffer nominal value or the current electrode voltage in
mV. The calibration can be terminated after the first buffer solution.
This corresponds to a single-point calibration. When doing so, the in-
strument uses the Nernst slope (-59,2 mV/pH at 25 °C) and determines
the asymmetry of the electrode.
AutoCal DIN is specially adapted to the permanently programmed buffer solutions in
accordance with DIN 19266 as a fully automatic two-point calibration.
The operating sequence of the AutoCal DIN calibration corresponds to
that of the AutoCal TEC calibration. The calibration can only be terminated after the first buffer solution (single point calibration).
ConCal This function is a conventional two-point calibration using two buffer
solutions (pH 7.0 ± 0.5 and any other buffer solution) or a single-point
calibration using any buffer solution, which is used as a high-speed
method.
AutoRead When calibrating with AutoCal TEC and AutoCal DIN, the AutoRead
function is automatically activated.
The current AutoRead measurement can be terminated at any time
(accepting the current value) by pressing <RUN/ENTER>.
Displaying the calibra-
tion data
You can view the data of the last calibration on the display. The proceeding is described on page 53.
Printing the calibration
record
The calibration protocol contains the calibration data of the current calibration. You can transmit the calibration protocol to a printer via the serial interface (see page 55).
Operation handylab pH/LF 12
24
Note
You can automatically print a calibration protocol after the calibration.
To do so, connect a printer to the interface according to section 4.7.2
before calibrating. After a valid calibration, the record is printed.
Sample printout:
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the calibration. The asymmetry and slope are evaluated separately.
The worst evaluation appears on the display.
CALIBRATION PROTOCOL
02.03.01 14:19
Device No.: 12345678
Calibration pH
Cal time: 01.03.01 / 15:20
Cal interval: 7d
AutoCal TEC Tauto
Buffer 1 2.00
Buffer 2 4.01
Buffer 3 7.00 *
Buffer 4 10.01
C1 184.1 mV 25.0°C
C2 3.0 mV 25.0°C
S1 -59.4 mV/pH
ASY1 - 4 mV
Display Asymmetry
[mV]
Slope
[mV/pH]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
Clean the electrode according to the
electrode operating manual
-30 ... +30 -62 ... -61
or
-56 ... -50
E3
Eliminate the error according to chapter 6 W
HAT TO DO IF...
< -30 or
> 30
< -62 or
> -50
Loading...