Hach sensION+ MM374 User manual

DOC022.97.90253
sensION™+ MM374
12/2013, Edition 4
User Manual
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English...................................................................................................................................................................................................3
Français..............................................................................................................................................................................................23
Español...............................................................................................................................................................................................44
Português..........................................................................................................................................................................................65
中文.......................................................................................................................................................................................................85
日本語................................................................................................................................................................................................103
한글.....................................................................................................................................................................................................123
ไทย........................................................................................................................................................................................................143
2

Table of contents
Specifications on page 3 Advanced operation on page 12
General information on page 4 Data logger on page 13
Installation on page 5 Maintenance on page 15
User interface and navigation
on page 8
Troubleshooting on page 17
Startup on page 9 Replacement parts and accessories
on page 18
Standard operation on page 9 Standard solutions on page 19
Specifications
Specifications are subject to change without notice.
Specification Details
Dimensions 35 x 20 x 11 cm (13.78 x 7.87 x 4.33 in.)
Weight 1100 g (2.43 lb)
Meter enclosure IP42
Power requirements
(external)
100–240 V, 0.4 A, 47-63 Hz
Meter protection class Class II
Pollution degree 2
Installation category Category II
Altitude requirements Standard 2000 m (6562 ft) ASL (Above Sea Level)
Storage temperature –15 to +65 °C (5 to +149 °F)
Operating temperature 0 to 40 °C (41 to 104 °F)
Operating humidity < 80% (non-condensing)
Specification Details
Resolution pH: 0.1/0.01/0.001, ORP: 0.1/1 mV, ISE:
programmable, temperature: 0.1 ºC (0.18 ºF), EC:
variable, resistivity: variable, NaCl: variable, TDS:
variable
Measuring error (±
1 digit)
pH: ≤ 0.005, ORP: ≤ 0.2 mV, temperature: ≤ 0.2 ºC (≤
0.36 ºF), EC: ≤ 0.5%, resistivity: ≤ 0.5 %, NaCl: ≤
0.5 %, TDS: ≤ 0.5%
Reproducibility (±
1 digit)
pH: ± 0.001, ORP: ± 0.1 mV, temperature: ± 0.1 ºC (±
0.18 ºF), EC: ± 0.1%, resistivity: ± 0.1%, NaCl ± 0.1%,
TDS ± 0.1%
Data storage 330 results and last 9 calibrations
Connections 2 Combined or indicator probe: BNC connector (Imp.
>1012Ω); 2 Reference electrodes: banana connector;
A.T.C. type Pt 1000: banana or telephonic; 2 magnetic
stirrers: RCA connector
Conductivity probe with built-in Pt1000 sensor (or NTC
10 kΩ probe): telephonic connector
RS232C for printer or PC: telephonic connector;
external PC keyboard: mini DIN connector
Temperature correction Channel 1 pH: Pt 1000 temperature probe (A.T.C.),
NTC 10 kΩ probe, manual, Channel 2 temperature,
isopotential pH programmable, standard value 7.00,
CE: Pt 1000 temperature probe (A.T.C.), linear
function, TC=0.00 to 9.99%/Temperature, TRef: 20°C
(68 °F) or 25°C (77 °F), non-linear function for natural
waters (UNE EN 2788) Channel 2 pH: Pt
1000 temperature probe (A.T.C.), manual, NTC 10KΩ
probe, isopotential pH programmable, standard value
7.00
Measurement display
lock
Continuous measurement, by stability, by time
Display Liquid crystal, backlit, 128 x 64 dots
Keyboard PET with protective treatment
Certification CE
English 3

General information
Revised editions are found on the manufacturer’s website.
Safety information
NOTICE
The manufacturer is not responsible for any damages due to misapplication or
misuse of this product including, without limitation, direct, incidental and
consequential damages, and disclaims such damages to the full extent permitted
under applicable law. The user is solely responsible to identify critical application
risks and install appropriate mechanisms to protect processes during a possible
equipment malfunction.
Please read this entire manual before unpacking, setting up or operating
this equipment. Pay attention to all danger and caution statements.
Failure to do so could result in serious injury to the operator or damage
to the equipment.
Make sure that the protection provided by this equipment is not impaired.
Do not use or install this equipment in any manner other than that
specified in this manual.
Use of hazard information
DANGER
Indicates a potentially or imminently hazardous situation which, if not avoided, will
result in death or serious injury.
W A R N I N G
Indicates a potentially or imminently hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate
injury.
NOTICE
Indicates a situation which, if not avoided, may cause damage to the instrument.
Information that requires special emphasis.
Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or
damage to the instrument could occur if not observed. A symbol on the
instrument is referenced in the manual with a precautionary statement.
This symbol, if noted on the instrument, references the instruction
manual for operation and/or safety information.
Electrical equipment marked with this symbol may not be disposed of
in European domestic or public disposal systems. Return old or end-
of-life equipment to the manufacturer for disposal at no charge to the
user.
Product overview
The sensION™+ meters are used with probes to measure various
parameters in water.
The sensION™+ MM374 meter has two measurement channels to
measure pH, ORP (mV), conductivity or ISE (concentration) with a
selective probe. Channel 1 measures one or two parameter individual or
simultaneously and up to two probes can be connected. Channel
2 measures pH, ORP (mV) or ISE. Measurement data can be stored and
transferred to a printer or PC.
Product components
Refer to Figure 1 to make sure that all components have been received.
If any items are missing or damaged, contact the manufacturer or a
sales representative immediately.
4 English

Figure 1 Meter components
1 Electrolyte for the probe 6 Power supply
2 Buffer solutions (pH 4.01 and pH
7.00)
7 Probe holder
3 Calibration beakers (with magnetic
bar inside)
8 Rod
4 Standard solution (1413 µS/cm) 9 Probes (included with kits only)
5 Calibration beaker (with magnetic
bar inside)
10 Meter
Installation
Assemble the probe holder
Follow the numbered steps to assemble the probe holder and to connect
the magnetic stirrer.
English 5

1 2
3 4
6 English

Connect to AC power
DANGER
Electrocution hazard. If this equipment is used outdoors or in
potentially wet locations, a Ground Fault Circuit Interrupt (GFCI/GFI)
device must be used to connect the equipment to its main power
source.
The meter can be powered by AC power with the universal power
adapter.
1. Select the correct adapter plug for the power outlet from the adapter
kit.
2. Connect the universal power adapter to the meter (Figure 2).
3. Connect the universal power adapter to an AC receptacle (Figure 3).
4. Turn the meter on.
Figure 2 Connector panel
1 Magnetic stirrer 1 connector,
Channel 1
7 PC keyboard, mini DIN connector
2 Reference electrode (separated
electrodes) connector, Channel 1
8 Conductivity probe connector,
Channel 2
3 Reference electrode (separated
electrodes) connector, Channel 2
9 Temperature probe connector,
Channel 2
4 Separated temperature probe
connector, Channel 2
10 Combined pH electrode (or
indicator) connector, Channel 2
5 RS-232 for printer or PC connector 11 Combined pH electrode (or
indicator) connector, Channel 1
6 Power supply 12 Magnetic stirrer 2 connector,
Channel 1
English 7

Figure 3 AC power connection
Note: Position the equipment so it is not difficult to disconnect power to the
equipment.
User interface and navigation
User interface
Keypad description
1 RETURN key: cancel or exit the
current menu screen to the
previous menu screen
5 DOWN key: scroll to other options,
change a value
2 MEASUREMENT key: confirm the
selected option
6 ON/OFF: turn on or turn off the
meter
3 UP key: scroll to other options,
change a value
7 LEFT key: change between
Channel 1 and Channel 2, enter
numbers and letters
4 RIGHT key: change between
Channel 1 and Channel 2, enter
numbers and letters
Display description
The meter display shows the concentration, units, temperature,
calibration status, operator ID, sample ID, date and time.
8 English

Figure 4 Single screen display
1 Sample ID 5 Measurement channel
2 Measurement unit and value
(conductivity or ISE)
6 Sample temperature (ºC or ºF)
3 Measurement unit and value (pH,
ORP/mV)
7 Visual measurement timer
4 Measurement mode or time and
date
Navigation
Use the to return to the previous menu. Use the measure key to
take a sample measurement or to confirm options. Use the arrow keys
to scroll to other options or to change a value. To change the
parameters use the arrow keys and . Refer to each task for specific
instructions.
Startup
Turn the meter on and off
NOTICE
Make sure that the probe is connected to the meter before the meter is turned on.
Push to turn on or turn off the meter. If the meter does not turn on,
make sure that the AC power supply is properly connected to an
electrical outlet.
Change the language
The display language is selected when the meter is powered on for the
first time.
1. Use the or to select a language from a list.
2. Confirm with . The measurement screen shows DATA OUTPUT.
3. Select Deactivated if no printer or PC is connected and confirm.
Refer to Select the data output on page 12 for more information
about Data Output.
Standard operation
Calibration
DANGER
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Calibration settings
The calibration settings contain Calibration type, Calibration frequency
and Display options.
1. From the main menu use the or to select CALIBRATION.
Confirm.
2. Use the to enter the calibration menu.
3. Use the or to select the following options:
Option Description
Stability C.: Criterion by stability—select Fast, Standard or Strict.
English 9

Option Description
Calibration
type
pH: Calibration type—select Technical buffers,
DIN19266 Buffers, User Buffers, To a X value, data
introduction or Theoretical calibration.EC: Calibration type
—select Molar Standards, Demal Standards, NaCl
Standards, Calibration to a X value, data introduction or
Theoretical calibration. Refer to Calibration types for more
information.
Cal. frequency Calibration reminder—can be set between 0–7 days
(default daily). The display shows the remaining time to
the new calibration. Refer to Set the calibration reminder
on page 11 for more information.
Display mV Display mV—select YES or NO to show mV.
Calibration types
Different calibration types can be selected.
1. From the main menu use the or to select CALIBRATION.
Confirm.
2. Use the to enter the calibration menu.
3. Use the or to select Calibration type.
Option Description
Technical buffers pH 2.00, 4.01, 7.00, 9.21 and 10.01 at 25 °C
(77 °F)
DIN19266 Buffers pH 1.679, 4.006, 6.865, 7.000, 9.180, 10.012 and
12.454
User Buffers Selected when the technical or DIN19266 buffers
are not used. Refer to Technical buffer solutions
(DIN 19267) on page 19 for pH values of
specific buffer sets at varying temperatures.
Calibration to a X value To adjust manually any scale value of the
measured pH or conductivity.
Data introduction Manual probe constant introduction.
Option Description
Theoretical calibration pH: The probe calibration data is replaced at
25 °C (77 °F). EC: The probe calibration data is
replaced with C=1.000 cm -1
Molar Standards 147 µS/cm, 1413 µS/cm, 12.88 mS/cm and
111.8 mS/cm at 25 °C (77 °F)
Demal Standards 1049 µS/cm, 12.85 mS/cm and 111.31 mS/cm at
25 °C (77 °F)
NaCl Standards 1014.9 µS/cm 25 °C (77 °F)
Calibration procedure
This procedure is for general use with liquid calibration solutions. Refer
to the documents that are included with each probe for additional
information.
Note: Solutions should be stirred during calibration. For more information about the
stirring settings, refer to Change the stirring settings on page 13.
Note: If Channel 1 is used as a double channel (pH and EC) the temperature will
be measured by the conductivity cell with integrated ATC. The conductivity cell
must be immersed in the pH buffer solution as well during the pH calibration.The
manual temperature modification is not possible.
1. Pour the buffers or calibration solutions into the labeled calibration
beakers.
2. From the main menu use the or and and to select the
CALIBRATION parameter. Confirm.
3. If required select the Operator ID (1 to 10) and confirm.
4. Rinse the probe with deionized water and put the probe into the first
calibration beaker. Be sure that there are no air bubbles in the
membrane.
5. Push to Start calibration.
6. Push to measure the first calibration solution.
The next calibration solution is shown.
7. Rinse the probe with deionized water and put the probe into the
second calibration beaker. Be sure that there are no air bubbles in
the membrane.
10 English

8. Push to measure the second calibration solution.
The next calibration solution is shown.
9. Rinse the probe with deionized water and put the probe into the third
calibration beaker. Be sure that there are no air bubbles in the
membrane.
10. Push to measure the third calibration solution.
When the calibration is good, the display briefly shows Calibration
OK and then returns to the main menu.
Note: When a printer is connected the print menu opens and the result can be
printed.
View the calibration data
Data from the most recent calibration can be shown.
1. From the main menu use the or to select DATA LOGGER.
Confirm.
2. Select Display data.
3. Select Calibration data and confirm with . The last calibration data
is shown.
• pH-the slope and offset values are shown alternating with the
deviation (in %) and calibration temperature.
• ORP-the measured mV value and calibration temperature are
shown.
• Conductivity-the cell constant and calibration temperature for each
standard are shown.
Set the calibration reminder
pH: The calibration reminder can be set between 0 to 23 hours or
1-7 days (default 1 day). EC: The calibration reminder can be set
between 0 to 99 days (default 15 days). The display shows the
remaining time to the new calibration.
Note: When 0 days is selected, the calibration reminder is turned off.
1. From the main menu use the or to select CALIBRATION.
Confirm.
2. Use the to enter the calibration menu.
3. Use the or to select Cal. frequency and confirm.
4. Use the and to advance to the next step and use the or to
change a value. Confirm.
Push to start the calibration.
Sample measurements
Each probe has specific preparation steps and procedures for taking
sample measurements.
1. From the main menu use the or and and to select
MEASURE. Confirm.
2. Use the to change the following settings. Confirm every entry.
Option Description
Resolution Select the resolution: 1, 0.1, 0.01 (default) or 0.001
Measure Stability—select By stability Criterion: Fast (variation <
0.02 pH in 6 s), Standard (variation < 0.01 pH in 6 s) or Strict
(variation < 0.002 pH in 6 s). In continuous—enter the time
interval for the In continuous Acquis. interval (data storage or
printing data). By time—enter the time interval for data storage
or printing data.
Display mV Display mV—select YES or NO to show mV.
Limits Limits—select YES or NO. YES: Enter the upper and lower
limits. An acoustic warning appears when the measurement is
out of limit. The report output shows an A next to the
measured value when the measurement was out of limit.
Isopotential Isopotential—change the Isopotential pH value in Data
introduction. Select Calculate to calibrate the probe again.
TC TC—select Linear or Natural waters. Linear: enter a value in
%/°C (default 2.00%/Temperature). Natural waters: Non-linear
for natural waters, according to EN27888
Tref Reference temperature—select between 20 or 25 °C or Other
temperature.
3. Push to start the measurement.
Note: If the measurement is not stabilizing after 120 seconds, the meter turns
automatically into the continuous measurement mode.
English 11

Advanced operation
Change the measurement units
The measurement units can be changed individually for each channel.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Measurement units and confirm.
3. Select Channel 1 and confirm.
4. Select Parameter 1 and then Parameter 2 and select one of the
following options:
Option Description
Parameter 1 mV, pH, ISE or Disabled
Parameter 2 EC, NaCl, TDS, Ω or Disabled
5. Select Channel 2 and confirm with . Select mV, pH or ISE and
confirm.
Use a sample ID
The sample ID tag is used to associate readings with a particular sample
location. If assigned, stored data will include this ID.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Sample ID and confirm.
3. Use the or to select
Option Description
Automatic A consecutive number will be automatically assigned to every
sample.
Manual A keyboard or a barcode scanner is required to enter the
sample ID name before taking a measurement (maximum
15 characters).
Select the data output
Data can be stored or transferred to a printer or to a PC.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Data Output and confirm.
3. Use the or to select
Option Description
Deactivated Select Deactivated if no printer or PC is connected.
For Printer Select Dot matrix printer or Thermal printer.
For Computer Select Terminal, LabCom or LabCom Easy. The LabCom
Software controls several modules, pH and conductivity
meters, automatic burettes, Samplers and so on from a
computer. The LabCom Easy software gets measurements
and calibration data from the meters
Change the date and time
The date and time can be changed from the Date / Time menu.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Date / Time and confirm.
3. Use the and to advance to the next step and use the or to
change a value. Confirm.
The current date and time will be shown on the display.
Adjust the display contrast
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Display contrast and confirm.
3. Use the and to adjust the contrast of the display and confirm.
Adjust the temperature
The temperature measurement can be adjusted at 25 °C (77 °F) and/or
85 °C (185 °F) to increase accuracy.
12 English

1. Put the probe and a reference thermometer in a container of water at
approximately 25 °C and allow the temperature to stabilize.
2. Compare the temperature read by the meter with that of the
reference thermometer. The difference is the adjustment value for
the meter.
Example: reference thermometer: 24.5 °C; meter: 24.3 °C.
Adjustment value: 0.2 °C.
3. Enter the adjustment value for the 25 °C reading:
a. From the main menu use the or to select SYSTEM. Confirm.
b. Use the or to select Readjust temp. and confirm.
c. Select Channel 1 or Channel 2 and confirm. The temperature for
channel 1 is measured by the conductivity cell and channel 2 is
measured by the pH probe. If no Conductivity cell is connected,
the temperature value must be entered manually or the
temperature measured in channel 2 can be applied to the meter.
d. Use the or to select 25 °C and confirm.
e. Use the arrow keys to enter the adjustment value for 25 °C.
Confirm.
4. Put the probe and a reference thermometer in a container of water at
approximately 85 °C and allow the temperature to stabilize.
5. Compare the temperature from the meter with that of the reference
thermometer. The difference is the adjustment value for the meter.
a. Use the or to select 85 °C and confirm.
b. Use the arrow keys to enter the adjustment value for 85 °C.
Confirm.
c. Select Save changes and confirm.
Change the stirring settings
The magnetic stirrer can be turned on and the stirring speed can be
changed in the Stirring menu.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Stirring and confirm.
3. To turn on/off the stirrer push .
4. When the stirrer is turned on, use the or to change the stirring
speed in %.
Note: Use the or to change the stirring speed during calibration and
during a measurement.
Turn the stirrer on or off
The stirrer 1 works with Channel 1 and 2 (Stirrer 1). A second stirrer can
be connected to channel 2 (Stirrer 2). For the stirrer 2 activation refer to
the following steps.
1. From the main menu use the or to select SYSTEM. Confirm
with .
2. Use the or to select Stirrer N.2 and confirm with .
3. Use the or to select YES to turn the stirrer 2 on.
Note: Select NO to turn the stirrer 2 off.
Change the temperature units
The temperature units can be changed to Celsius or Fahrenheit.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Temperature units and confirm.
3. Use the or to select between Celsius or Fahrenheit and confirm.
Data logger
Display data
The Display data log contains Measurement data, Electrode report and
Calibration data. The stored data can be sent to a printer or to a PC.
When the data log becomes full (400 data points), the oldest data point
is deleted when a new data point is added.
English 13

1. From the main menu use the or to select DATA LOGGER and
confirm.
2. Use the or to select Display data and confirm.
3. Use the or to select
Option Description
Measurement data Measurement data—stores automatically each time a
sample is measured
Electrode report Electrode report—stores automatically the electrode
history and measurement conditions
Calibration data Calibration data—stores automatically the current
calibration
Delete data
The entire measurement data or electrode report log can be deleted to
remove data that has already been sent to a printer or PC.
1. From the main menu use the or to select DATA LOGGER and
confirm.
2. Use the or to select Erase and confirm.
3. Use the or to select Measurement data or Electrode report and
confirm. Confirm again to delete the data.
The entire log is deleted at once.
Send data to a printer or to a computer
NOTICE
The data output (printer or PC) needs to be selected first, so that the Print menu
is available (refer to Select the data output on page 12).
Note: Refer to Report output on page 14 to select the report output type.
1. From the main menu use the or to select DATA LOGGER and
confirm.
2. Use the or to select Print and confirm. Select one of the
following options and confirm with to print the data: Measurement
data, Electrode data, Calibration data, Calibration report or
Instrument condit.
Report output
NOTICE
The data output (printer or PC) needs to be selected first, so that the Type of
report menu is available (refer to Select the data output on page 12).
Different report output types can be selected when a printer or a PC is
connected.
1. From the main menu use the or to select SYSTEM. Confirm.
2. Use the or to select Type of report and confirm.
3. When a printer or a computer and Terminal is connected, use the
or to select
Option Description
Reduced Select Several or One sample as an output format
14 English

Option Description
Standard Select Several or One sample as an output format. Select
several: Users: The user name appears on the printed report
(17 characters). Header:The company name can be added as a
header (40 characters) and appears on the print report. Identify
sensor:The sensor model and the sensor serial number can be
added and appears on the print report.
GLP Select Several or One sample as an output format. Select
several: Users: The user name appears on the printed report
(17 characters). Header:The company name can be added as a
header (40 characters) and appears on the print report. Identify
sensor:The sensor model and the sensor serial number can be
added and appears on the print report.
4. When a computer is connected and LabCom Easy (refer to Select
the data output on page 12 for more information) is selected, use the
or to select
Option Description
Users The user name appears on the printed report
(17 characters).
Identify sensor The sensor model and the sensor serial number can be
added and appears on the print report.
Maintenance
W A R N I N G
Multiple hazards. Do not disassemble the instrument for maintenance or service.
If the internal components must be cleaned or repaired, contact the
manufacturer.
CAUTION
Personal injury hazard. Only qualified personnel should conduct the tasks
described in this section of the manual.
Clean the instrument
NOTICE
Never use cleaning agents such as turpentine, acetone or similar products to
clean the instrument including the display and accessories.
Clean the exterior of the instrument with a moist cloth and a mild soap
solution.
Clean the probe
Clean the probe as needed. Refer to Troubleshooting on page 17 for
more information about cleaning. Refer to the probe documentation for
information about the probe maintenance.
Replace the magnetic stirrer
If the magnetic stirrer does not start, follow the numbered steps to
replace the magnetic stirrer.
English 15

1 2
16 English

Troubleshooting
Refer to the following table for common problem messages or
symptoms, possible causes and corrective actions.
Table 1 Calibration warnings and errors
Error/Warning Solution
Calibration out of
range
Measured value out of range.
Calibrate again. Connect a new probe.
Unknown buffer Calibrate again.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure that
there are no air bubbles in the membrane. Shake the
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Examine the buffer solution: Make sure that the buffer
used matches the buffer specified in configuration; make
sure of the temperature specification in configuration; use
a new buffer solution.
Same buffer /
standard. Re-
calibrate
Unstable
measurement
Time > 100 s (pH,
EC and DO
calibrations)
Time > 240 s (ISE
calibrations)
Calibrate again.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure that
there are no air bubbles in the membrane. Shake the
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Make sure that the membrane and the diaphragm are
properly immersed in the sample.
Temperature
difference > 3.0 ºC
Adjust the calibration solutions to the same temperature.
Examine the temperature sensor.
Temperature out of
range
Examine the temperature sensor.
Connect a new probe.
Table 1 Calibration warnings and errors (continued)
Error/Warning Solution
Outside allowable
range
Offset or Slope outside the range.
Examine the buffer solution: Make sure that the buffer
used matches the buffer specified in configuration; make
sure of the temperature specification in configuration; use
a new buffer solution.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure that
there are no air bubbles in the membrane. Shake the
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Signal too low / high
(DO calibrations)
DO probe error.
Examine the probe. Connect a different probe to make
sure that if problem is with probe or meter.
Use a new standard solution.
Cell constant over
limits (EC
calibrations)
Insert the probe into the appropriate standard and re-
read.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure that
there are no air bubbles in the membrane. Shake the
probe like a thermometer; connect a different probe to
find if the problem is with the probe or the meter.
Cell constant
deviation error (EC
calibrations)
Not calibrated There are no calibration data stored in the instrument.
Perform calibration.
English 17

Table 2 Measurement warnings and errors
Error/Warning Solution
- - - - - Measured value is out of range.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure
that there are no air bubbles in the membrane. Shake
the probe like a thermometer; connect a different probe
to find if the problem is with the probe or the meter.
Unstable measurement
(pH, EC and DO
measurements)
Time > 120 s
Make sure that the membrane and the diaphragm are
properly immersed in the sample.
Examine the temperature.
Examine the probe: Clean the probe (refer to Clean the
probe on page 15 for more information); make sure
that there are no air bubbles in the membrane. Shake
the probe like a thermometer; connect a different probe
to make sure that if problem is with probe or meter.
10.389 mg/L >>>>>
00012 00:13
ISE measurement: The measured value is superior to
the highest standard used in calibration. Measure
again.
0.886 mg/L <<<<<<
00018 00:11
ISE measurement: The measured value is inferior to
the lowest standard used in calibration. Measure
again.
Replacement parts and accessories
Note: Product and Article numbers may vary for some selling regions. Contact the
appropriate distributor or refer to the company website for contact information.
Replacement parts
Description Item no.
sensION+ PH3 Lab pH-meter with accessories, without
probe LPV2000.97.0002
sensION+ PH31 Lab pH-meter, GLP, with accessories,
without probe LPV2100.97.0002
sensION+ MM340 Lab pH & Ion-meter, GLP, 2 channels,
with accessories, without probe LPV2200.97.0002
Replacement parts (continued)
Description Item no.
sensION+ EC7 Lab conductivity meter, with accessories,
without probe LPV3010.97.0002
sensION+ EC71 Lab conductivity meter, GLP, with
accessories, without probe LPV3110.97.0002
sensION+ MM374, 2 channel Lab meter, GLP,
accessories, without probes LPV4110.97.0002
sensION+ MM378, 2 channel Lab meter, GLP,
accessories, without probes LPV4130.97.0002
Consumables
Description Item no.
pH buffer solution 4.01, 125 mL LZW9460.99
pH buffer solution 7.00, 125 mL LZW9461.97
pH buffer solution 10.01, 125 mL LZW9470.99
pH buffer solution 4.01, 250 mL LZW9463.99
pH buffer solution 7.00, 250 mL LZW9464.97
pH buffer solution 10.01, 250 mL LZW9471.99
pH buffer solution 4.01, 1000 mL LZW9466.99
pH buffer solution 7.00, 1000 mL LZW9467.97
pH buffer solution 10.01, 1000 mL LZW9472.99
Electrolytic solution (KCl 3M), 125 mL LZW9510.99
Electrolytic solution (KCl 3M), 250 mL LZW9500.99
Electrolytic solution (KCl 3M), 50 mL LZW9509.99
Conductivity standard solution 147 µS/cm, 125 mL LZW9701.99
Conductivity standard solution 1413 µS/cm, 125 mL LZW9711.99
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Consumables (continued)
Description Item no.
Conductivity standard 12.88 mS/cm, 125 mL LZW9721.99
Conductivity standard 147 µS/cm, 250 mL LZW9700.99
Conductivity standard 1413 µS/cm, 250 mL LZW9710.99
Conductivity standard 12.88 mS/cm, 250 mL LZW9720.99
Electrolytic solution 0.1 M, 125 mL LZW9901.99
Enzyme solution 2964349
Pepsin Cleaning Solution 2964349
Electrode cleaning solution 2965249
0.1 N HCl solution 1481253
Ethanol, 95% (Grease, oils, fats) 2378900
Accessories
Description Item no.
Thermal printer, USB, for sensION+ benchtop instruments LZW8203.97
Thermal paper for printer LZW8203, bag with 4 rolls LZM078
Power supply for sensION+ benchtop instruments,
230-115 VAC LZW9008.99
LabCom Easy PC SW, for sensION+ GLP, CD, cable,
USB adapter LZW8997.99
LabCom PC SW, for sensION+ GLP, CD, cable, USB
adapter LZW8999.99
Magnetic stirrer with sensor holder, for sensION+
multimeters LZW9319.99
3x50 mL printed beakers for pH calibration LZW9110.97
3x50 mL printed beaker for conductivity calibration LZW9111.99
Accessories (continued)
Description Item no.
Three-sensor holder, for sensION+ benchtop instruments LZW9321.99
Radiometer probe holder for sensION+ benchtop
instruments LZW9325.99
Pyrex glass chamber, continuous flow measurements LZW9118.99
PP protector, electrode storage LZW9161.99
Teflon coated stirring bar, 20 x 6 mm LZW9339.99
Standard solutions
Technical buffer solutions (DIN 19267)
Refer to Table 3 pH and ORP (mV) values of specific buffer sets at
varying temperatures.
Table 3 pH, ORP (mV) and temperature values
Temperature pH mV
°C °F
0 32 2.01 4.01 7.12 9.52 10.30 —
10 50 2.01 4.00 7.06 9.38 10.17 245
20 68 2.00 4.00 7.02 9.26 10.06 228
25 77 2.00 4.01 7.00 9.21 10.01 220
30 86 2.00 4.01 6.99 9.16 9.96 212
40 104 2.00 4.03 6.97 9.06 9.88 195
50 122 2.00 4.06 6.97 8.99 9.82 178
60 140 2.00 4.10 6.98 8.93 9.76 160
70 158 2.01 4.16 7.00 8.88 — —
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Table 3 pH, ORP (mV) and temperature values (continued)
Temperature pH mV
°C °F
80 176 2.01 4.22 7.04 8.83 — —
90 194 2.01 4.30 7.09 8.79 — —
Buffer solutions (DIN 19266)
Refer to Table 4 for pH values of specific buffer sets at varying
temperatures.
Table 4 pH and temperature values
Temperature pH
°C °F
5 32 1.668 4.004 6.951 7.087 9.395 10.245 13.207
10 50 1.670 4.000 6.923 7.059 9.332 10.179 13.003
20 68 1.675 4.001 6.881 7.016 9.225 10.062 12.627
25 77 1.679 4.006 6.865 7.000 9.180 10.012 12.454
30 86 1.683 4.012 6.853 6.987 9.139 9.966 12.289
40 104 1.694 4.031 6.838 6.970 9.068 9.889 11.984
50 122 1.707 4.057 6.833 6.964 9.011 9.828 11.705
60 140 1.723 4.085 6.836 6.968 8.962 — 11.449
70 158 1.743 4.126 6.845 6.982 8.921 — —
80 176 1.766 4.164 6.859 7.004 8.885 — —
90 194 1.792 4.205 6.877 7.034 8.850 — —
Conductivity standard solutions
Refer to Table 5 for conductivity values of standard solutions at varying
temperatures.
Table 5 Conductivity and temperature values
Temperature Conductivity (EC)
°C °F µS/cm µS/cm mS/cm mS/cm
15.0 59 119 1147 10.48 92.5
16.0 60.8 122 1173 10.72 94.4
17.0 62.6 125 1199 10.95 96.3
18.0 64.4 127 1225 11.19 98.2
19.0 66.2 130 1251 11.43 100.1
20.0 68 133 1278 11.67 102.1
21.0 69.8 136 1305 11.91 104.0
22.0 71.6 139 1332 12.15 105.4
23.0 73.4 142 1359 12.39 107.9
24.0 75.2 145 1386 12.64 109.8
25.0 77 147 1413 12.88 111.8
26.0 78.8 150 1440 13.13 113.8
27.0 80.6 153 1467 13.37 115.7
28.0 82.4 156 1494 13.62 —
29.0 84.2 159 1522 13.87 —
30.0 86 162 1549 14.12 —
31.0 87.8 165 1581 14.37 —
32.0 89.6 168 1609 14.62 —
33.0 91.4 171 1638 14.88 —
34.0 93.2 174 1667 15.13 —
35.0 95 177 1696 15.39 —
20 English