OHAUS ST3100-F, ST3100-B User manual

STARTER 3100
Bench pH Meter
Instruction Manual

Manual de instrucciones
del pHmetro de mesa
STARTER 3100

STARTER 3100
PH-mètre de laboratoire

Manuel d’instructions

STARTER 3100
Medidor de pH de Bancada
Manual de Instruções

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TABLE OF CONTENTS

1 INTRODUCTION ................................................................... 1

1.1 Definition of Signal Warnings and Symbols ...................................... 1

1.2 Safety Precautions ............................................................................ 2

1.3 Display and controls .......................................................................... 3

2 INSTALLATION ..................................................................... 5

2.1 Package contents .............................................................................. 5

2.2 Installing the stand-alone electrode holder ....................................... 6

2.3 Installing the power adapter .............................................................. 6

2.4 Connect the pH electrodes ................................................................ 7

2.5 Meter stand for adjusting view angle ................................................. 7

2.6 Attached quick guide ......................................................................... 7

3 SETUP ................................................................................... 8

3.1 Set temperature unit and MTC value ................................................ 8

3.2 Selecting a predefined buffer group .................................................. 8

4 STARTER 3100 OPERATION ............................................... 9

4.1 Calibration ......................................................................................... 9

4.1.1 Buffer group ................................................................................... 9

4.1.2 Performing 1-point calibration ..................................................... 10

4.1.3 Performing 2-point calibration ...................................................... 11

4.2 Sample measurement ..................................................................... 12

4.2.1 pH measurement ......................................................................... 12

4.2.2 mV measurement ........................................................................ 12

4.3 Temperature measurement ............................................................. 12

4.4 Using the memory ........................................................................... 12

4.4.1 Storing a reading ......................................................................... 12

4.4.2 Recalling from memory ............................................................... 12

4.4.3 Clearing the memory ................................................................... 13

4.5 Printing ............................................................................................ 13

5 MAINTENANCE .................................................................. 15

5.1 Error message ................................................................................. 15

5.2 Meter maintenance.......................................................................... 15

5.3 Electrode maintenance ................................................................... 16

5.4 Self-diagnosis .................................................................................. 16

5.5 Recover factory settings .................................................................. 16

6 TECHNICAL DATA .............................................................. 17

6.1 Specifications .................................................................................. 17

6.2 Compliance ..................................................................................... 18

7 BUFFER GROUP ................................................................ 19

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STARTER 3100 Bench pH Meter EN-1

General hazard

Explosion hazard

Corrosive hazard



Alternating current



Direc

1 INTRODUCTION

Thank you for choosing OHAUS.

Please read the manual completely before using the STARTER 3100 bench pH meter to ensure
proper setup, operation and maintenance.

STARTER 3100 has an excellent performance/price ratio and is designed with many useful features
including a stand-alone electrode holder and a beeper for error alert. Other accessories such as
pH electrodes and buffer solutions are also available.

STARTER 3100 offers many practical features and functions such as:

x Large backlit LCD with Quick Guide attached under the meter to assist with user operation
x Stand-alone electrode holder for maximum flexibility
x Electrode condition icon automatically showing you the health of your pH electrode
x RS232 port and memory to store up to 99 measurements

1.1 Definition of Signal Warnings and Symbols

Safety notes are marked with signal words and warning symbols. These show safety issues and
warnings. Ignoring the safety notes may lead to personal injury, damage to the instrument,
malfunctions and false results.

Signal Words
WARNING For a hazardous situation with medium risk, possibly resulting in

CAUTION For a hazardous situation with low risk, resulting in damage to the

Attention For important information about the product.
Note For useful information about the product
Warning Symbols

t current

injuries or death if not avoided.

device or the property or in loss of data, or injuries if not avoided.

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EN-2 STARTER 3100 Bench pH Meter

1.2 Safety Precautions

CAUTION: Read all safety warnings before installing, making connections, or servicing this

equipment. Failure to comply with these warnings could result in personal injury and/or property
damage. Retain all instructions for future reference.

x Verify that the input voltage range printed on the data label and the plug type matches the

local AC power to be used.

x Make sure that the power cord does not pose a potential obstacle or tripping hazard.
x Use the equipment only in dry locations.
x Dry off any liquid spills immediately. The instrument is not watertight.
x When using chemicals and solvents, comply with the instructions of the chemical producer

and the general lab safety rules.

x Use only approved accessories and peripherals.
x Operate the equipment only under ambient conditions specified in these instructions.
x Disconnect the equipment from the power supply when cleaning.
x Do not operate the equipment in hazardous or unstable environments.
x Service should only be performed by authorized personnel.

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STARTER 3100 Bench pH Meter EN-3

1

Electrode condition

and offset: ± (0
Electrode

good

or offset: ± (
Electrode
acceptable

or offset: ± (
Electrode

not

good or needs cleaning

2

Endpoint stability icon

; Auto endpoint icon

3

Measurement icon - ; means measurement or calibration is running when blinks

4

Calibration icon - ; means calibration in progress when display

5

Setup icon

group

etc.

6

pH/mV reading or slope in calibration process

7

Calibration point / Buffer group /Memory number / Error index

8

Auto temperature compensation - ATC ; Manual temperature compensation - MTC

9

Temperature during measurement or offset (mV) in calibration process

2 3 4 1 5

8

9

1

2 3 4

5

6

1.3 Display and controls

Displays

Slope: more than 95%

-15) mV

condition is

- ; instrument is in the setup mode, can set temperature(MTC), buffer

Slope: 90-95%

15-35) mV

condition is

Slope: less than 90%

35-60) mV

condition is

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EN-4 STARTER 3100 Bench pH Meter

Button

Press & release

Press & hold

- Start or finish measurement

- Confirm setting, store entered

- Turn auto endpoint on / off

- Start calibration

- Recall the latest calibration

- Meter turn on

-

to measurement

- Meter turn off

- Store current reading to memory

-

-

- Recall stored data

-

- Switch between pH and mV

-

- Scroll down through the memory

- Enter setup mode

-

Turn on/turn off the backlight
of the LCD

Controls

for 3 seconds

value

Exit and return
screen

Increase value during setting
Scroll up through the memory

Decrease value during setting

Start self-diagnosis

,

data : slope and offset

Print current memory data

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STARTER 3100 Bench pH Meter EN-5

Model

Description

P/N

ST310

3-in-1 plastic refillable pH Electrode

83033965

ST210

2-in-1 plastic refillable pH Electrode

83033966

ST320

3-in-1 plastic gel pH Electrode(no need to fill)

83033967

ST230

2-in 1 glass muddy sample pH Electrode

83033968

STORP1

Gel plastic ORP electrode

30038555

STORP2

Refillable glass ORP electrode

30038553

STTEMP30

Temperature Electrode

83033970

ST

U

1

Stand-alone electrode holder

1 set

In use cover

1

12V Power supply

1 set

pH Buffer Powder Set (4.01, 7.00, 10.01)

1 set

ST310 3-in-1 refillable pH electrode

1

pH Buffer Powder Set (4.01, 7.00, 10.01)

1 set

ST320 3-in-1 gel pH electrode

1

2 INSTALLATION

Carefully unpack the box.

2.1 Package contents

The model ST3100-B (basic package) has the following items:

3100-B

STARTER 3100

In addition to ST3100-B content, the ST3100-F package also includes the following:

In addition to ST3100-B content, the ST3100-H package also includes the following:

Each pH buffer powder should be dissolved in 250ml pure water or deionized water in a
volumetric flask.

Additional electrodes available include the following:

nits

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EN-6 STARTER 3100 Bench pH Meter

Buffer powder set (4.01; 7.00; 10.00)

83033971

Buffer pH1.68 250ml

30100424

Buffer pH4.01 250ml

30100425

Buffer pH7.00 250ml

30100427

Buffer pH10.01 250ml

30100429

Buffer pH12.45 250ml

30100430

Electrode holder stand alone (3100/3100C)

30058733

In use cover

30058734

Buffers and Accessories:

2.2 Installing the stand-alone electrode holder

Install the electrode arm on the base,

After adjusting the tension knob to some extent, you can move the upper arm up and down.
When the pH electrode is installed on the arm, the storage bottle of pH electrode fits into the
base hole.

2.3 Installing the power adapter

Insert the right adapter clip into the power adapter slot. The Ohaus balance power supply is also
12V which could also be used for the pH meter.

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STARTER 3100 Bench pH Meter EN-7

2.4 Connect the pH electrodes

There are 3 sockets for electrode. “pH” socket (BNC); “TEMP.” Socket (Cinch) and “REF” Socket
(2mm banana).



For ST310 electrode connect to the BNC and Cinch socket. For 2-in-1 pH electrode (e.g. S T210)
you only need to connect the BNC.

REF socket is for separate reference electrode. (e.g.STREF1)

2.5 Meter stand for adjusting view angle



One unique design of the STARTER 3100 is the meter stand, which can be used to adjust the view
angle of the display in case of working on high table.

2.6 Attached quick guide

Another unique design of the STARTER 3100 is the attached quick guide, the quick guide is
attached into the bottom housing of the meter.

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EN-8 STARTER 3100 Bench pH Meter

b1

1.68

4.01

7.00

10.01

3 SETUP

3.1 Set temperature unit and MTC value

Please note:
If a temperature electrode is used, Automatic Temperature Compensation (ATC) and the sample
temperature are displayed on the screen. You may then choose to skip MTC setup (below).

If the meter does not detect a temperature electrode or one is not used, the meter automatically
switches to Manual Temperature Compensation (MTC) mode and MTC appears on the screen.

MTC can be set as follows:

 Power the meter on by pressing

 Press and hold

temperature unit blinks (°C or °F).

 Press

 Press

Then

 Continue with MTC temperature setting by using

compensation accordingly

 Press

 Press

The default MTC temperature value setting is 25°C (77°F).
Note: °C = 5/9 (°F - 32)

or to switch between °C and °F.

until the setup icon appears on the display and the current

to confirm your selection.

to confirm the setting

to return to the measurement screen.

.

or to adjust temperature

3.2 Selecting a predefined buffer group

After confirming the MTC compensation temperature value, make the buffer group selection. Use

or to select a buffer group among 3 buffer groups (4.1.1). Press to

confirm the setting or press

The default buffer group is b1.

to leave to return to the measurement screen.

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STARTER 3100 Bench pH Meter EN-9

b1

1.68

4.01

7.00

10.01b22.00

4.01

7.00

9.21

11.00

b3

1.68

4.00

6.86

9.18

12.46

4 STARTER 3100 OPERATION

Standard procedure of pH measurement is as follows:

a) pH electrode preparation
b) buffer preparation and pH electrode calibration
c) sample preparation
d) pH measurement
e) Record measurement results or print

f) Rinse the pH electrode and properly store
pH electrode preparation: pH electrode should be rinsed with pure water befor e and after using.
Check if the electrode is physically damaged. (Be careful with the glass bulb)
The pH electrode should be stored in the storage bottle; the solution in the bottle is 3M KCl
solution. After placing the pH electrode into the sample or buffer solution, user should stir several
seconds then wait 30 to 60 seconds for the signal to stabilize, and then press the button to
operate (Calibration or measurement).

WARNING Do not operate the equipment in hazardous environments. The
equipment is not explosion protected.

WARNING When using chemicals and solvents, comply with the instructions of the
chemical producer and the general lab safety rules.

4.1 Calibration

4.1.1 Buffer group

STARTER 3100 can perform 1-, 2- or 3- point calibrations.
There are 3 buffer groups in the meter, you can select the buffer group you prefer (see 4.3),
default buffer is b1 US standards; the buffer value will be automatically recognized during
calibration. The 3 predefined buffer groups are (at 25°C):

STARTER 3100 automatically corrects for the temperature dependence of the buffer pH values
given in the following table - buffer group b1.
This means, if the buffer solutions’ temperature is 15°C, the calibration value you will get should
be pH1.67 (buffer 1.68), pH4.00 (buffer 4.01), pH7.04(buffer 7.00) and pH10.12 (buffer 10.01).

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EN-10 STARTER 3100 Bench pH Meter

5 °C

1.67

4.01

7.09

10.25

10 °C

1.67

4.00

7.06

10.18

15 °C

1.67

4.00

7.04

10.12

20 °C

1.68

4.00

7.02

10.06

25 °C

1.68

4.01

7.00

10.01

30 °C

1.68

4.01

6.99

9.97

35 °C

1.69

4.02

6.98

9.93

40 °C

1.69

4.03

6.97

9.89

45 °C

1.70

4.05

6.97

9.86

50 °C

1.71

4.06

6.96

9.83

Calibration: pH electrodes need to be calibrated with pH standard buffer solution before a proper
pH measurement can be made. Calibration is to display the right pH value when meter receive
the mV value signal from the pH electrode.

Slope: the linear coefficient between mV and pH according to theoretical value (e.g. -

59.16mV/pH @ 25 °C which means 100% slope);
Offset: the mV value when pH value is 7.00. (Theoretical value is 0 mV);

4.1.2 Performing 1-point calibration

When performing calibration, Ohaus recommends using Auto End Point Mode. After powering
the meter on, be sure the top of the screen shows

Mode.

Auto or Manual End point Mode:

to ensure the meter is in Auto End point

o Press and hold to change the End Point Mode.
o When in Manual Mode, to manually reach a pH measurement or calibration value,

you need to press button­then the sample reading or calibration value freezes,
freezes on the display.

o When in Auto End Point Mode, the meter determines when the reading is stable

then displays and locks the reading or calibration value automatically, the reading
freezes and
on the display.

Note: With the 1-point calibration only the offset is adjusted. If the sensor was previously
calibrated with multi-point calibration the previously stored slope will remain. Otherwise theoretical
100% slope (-59.16 mV / pH) will be used.

blinks 3 times then disappears; blinks 3 times and freezes

when reading is stable and displays :

blinks 3 times and

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STARTER 3100 Bench pH Meter EN-11

When STARTER 3100 is in pH measurement mode (see 4.2); place the pH electrode in a
calibration buffer, stir 5 seconds, wait for 30 seconds, then:

 Press

and appear on the top of the screen, is blinking during calibration.

 The meter reaches endpoint automatically according to the preselected auto-endpoint

mode, the calibration point pH value (e.g. 7.00) with the temperature display on the screen.

The 1-point calibration is finished; There are now 3 options (OHAUS recommends conducting at
least a 2 point calibration);

1. Press

2. Press
shown on the display for 3 seconds then return to the measurement screen.

3. Press

“Cal 1” displays on the bottom left of the screen and “Cal ” is blinking.

to do the 2-point calibration.

to store the 1-point calibration and exit, the offset and the slope are

to reject the calibration, return to the measurement screen.

4.1.3 Performing 2-point calibration

 Perform 1-point calibration as described above.
 Rinse the pH electrode with pure water and wipe off with tissue.

 Place the electrode in the next calibration buffer, stir and wait, then press

displays on the bottom left of the screen and “
and appear, is blinking during calibration.

 The mete r reaches endpoint according to the endpoint mode, the calibration point pH value

(e.g. 4.01) with the temperature display on the screen.

Cal ” is blinking. On the top o f the screen

, “Cal 2”

The 2-point calibration is finished. There are 3 options:

1. Press

2. Press
shown on the display for 3 seconds then return to the measurement screen.

3. Press

Note: To perform a 3 point calibration, follow the instructions for performing a 2 point calibration
using a third buffer.

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to do the 3-point calibration.

to store the 2-point calibration and exit, the offset and slope are

to reject the calibration, return to the measurement screen.

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EN-12 STARTER 3100 Bench pH Meter

4.2 Sample measurement

4.2.1 pH measurement

 Place the pH electrode in the sample. Stir for 5 seconds; wait for 30 seconds.

 Press

measurement.

 When meter reaches endpoint, the pH value with the temperature display on the screen.

to start the pH measurement, appears on the display. is blinking during

4.2.2 mV measurement

 Press to switch between pH measurement mode and mV measurement mode.
 Follow the same procedure as for pH measurement to perform mV measurement.

4.3 Temperature measurement

For better accuracy, we recommend to use either a built-in or a separate temperature electrode.

 If a temperature electrode is used, ATC and the sample temperature are displayed.
 If the meter does not detect a temperature electrode, it automatically switches to the manual

temperature compensation mode and MTC appears. MTC temperature should be set.

Note: STARTER 3100 accepts NTC 30 kΩ temperature sensor. ATC (Auto Temperature

Compensation) or MTC (Manual Temperature Compensation), the Temperature Compensation
only corrects for the change in the output of the electrode, not for the change in the actual solution.
This means the meter corrects the signal(mV) from the electrode to get a more accurate pH value
according to the real temperature.

4.4 Using the memory

4.4.1 Storing a reading

The STARTER 3100 can store up to 99 endpoint results.

 Press button

has been stored.

If you press
further data you will have to clear the memory. (See 4.4.3)

when the measurement reaches endpoint. M01 indicates that one result

when M99 is displayed, FUL displays to indicate the memory is full. To store

4.4.2 Recalling from memory

 Press and hold to recall the stored values from memory when the current

measurement reaches endpoint.

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STARTER 3100 Bench pH Meter EN-13

 Press button or to scroll through the stored results. R01 to R99 indicates which

result is being displayed.

 Press

to exit.

4.4.3 Clearing the memory

 Pressing or to scroll through the stored results until “MRCL” appears.

 Press

There are now 2 options:

 Press

 Press

, CLr blinks;

to confirm the deletion of all the stored data.

to return to the measurement mode without deleting the memory.

4.5 Printing

If the printer is connected to the STARTER 3100(e.g. SF-F40A, green light means connection
success; printer baud rate 9600bps; 8 data bit; none parity bit; 1 stop bit), a print-out is
automatically generated after each end pointed measurement or calibration.
The format for the print-out following a pH measurement is:
End Point, Value, Temp., ATC/MTC
Auto EP, 4.01pH, 25.0 °C, MTC

The details for the second line are:
Auto EP, 4.01pH, 25.0 °C , MTC
| | | |---- Manual Temperature Compensation
| | |---------------- Temperature value and unit ºC
| |------------------------- pH value
|---------------------------------------- Auto End Point

The format for the print-out following a mV measurement is:
End Point, Value, Temp., ATC/MTC
Manual EP, 182mV, 23.2 °C, ATC

The print-out in case of an error message is:
End Point, Value, Temp., ATC/MTC
Error3

The print-out for a 2-point calibration is:
Buffer1: 4.01pH
mV1: 178mV
Temp.1: 25.0 °C
Buffer2: 7.00pH
mV2: 3mV
Temp.2: 25.0 °C

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EN-14 STARTER 3100 Bench pH Meter

Slope: 99%
Offset: 5mV
ATC/MTC: MTC

The print-out for a 3-point calibration is:
Buffer1: 4.01pH
mV1: 178mV
Temp.1: 25.0 °C
Buffer2: 7.00pH
mV2: 0mV
Temp.2: 25.0 °C
Buffer3: 9.21pH
mV3: -130mV
Temp.3: 25.0 °C
Slope: 100%
Offset: 0mV
ATC/MTC: ATC

Printing from memory: When scrolling through the memory you can print the ent ry that is currently

viewed by pressing and holding (3 seconds) the
Recall 01:
End Point, Value, Temp., ATC/MTC
Manual EP, 4.01pH, 35.6 °C, ATC

. The printout format is as follows:

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STARTER 3100 Bench pH Meter EN-15

Error 0

Memory access error

Reset to factory settings

Error 1

Self-diagnosis failed

Repeat the self-diagnosis procedure and make
sure that you finish pressing all five keys within
two minutes.

Error 2

Measured values out of range

Check if the electrode is properly connected and
placed in the sample solution.

Error 3

Measured buffer temperature
out of range (

C)

Keep the pH buffer temperature within the range
for calibration

Error 4

Offset out of range
offset > 60mV or <

Make sure the pH buffer is correct and fresh;
Clean or replace the pH electrode.

Error 5

Slope out of range

Make sure the buffer is correct and fresh; Clean
or replace the

Error 6

Meter cannot recognize the
buffer

Make sure the buffer is correct and fresh; check if
the buffer has not been used more than once.

Error 9

The current data set has
already been stored once

An endpoint reading can only be stored once.
Perform a new measurement to store.

Error 10

The sample temperature out
of range

Check the sample temperature, the temperature
sensor.

5 MAINTENANCE

5.1 Error message

<5 or >40 °

- 60 mV

If an error happens, the meter will also beep 3 times to alert.
For further technical support please contact Ohaus. (US please contact 1-800-672-7722).

pH electrode.

5.2 Meter maintenance

Never unscrew the two halves of the housing!
The STARTER 3100 series instruments do not require any maintenance other than occasional wipe
with a damp cloth and the replacement of depleted batteries.
The housing is made of acrylonitrile butadiene styrene (ABS). This material is attacked by some
organic solvents, such as toluene, xylene and methyl ethyl ketone (MEK). Any spillage should be
immediately wiped off.

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EN-16 STARTER 3100 Bench pH Meter

b

5.3 Electrode maintenance

Make sure the electrode is filled with electrolyte solution. Always store the electrode according to
the electrode instruction manuals and do not allow it to dry out.

If the electrode response becomes sluggish or the slope is not acceptable, try the following:

o Soak the electrode in 0.1M HCl for at least 8 hours.
o For fat or oil contaminant, degrease the membrane with cotton wool soaked in either

acetone or a soap solution.

After electrode treatment, a new calibration should be performed. If the electrode slope is still not
acceptable, the electrode might need to be replaced.

5.4 Self-diagnosis

 When the meter is on, press and hold and simultaneously until the

meter displays the full screen. Each icon blinks one after the other.
This way you may check whether all icons are correctly shown. The next step is to check that the
keys are functioning correctly. This requires user interaction.

When b

blinks, five icons are displayed.

 Press the five keys in any order. Each time you press a key an icon disappears from the

screen, continue to press the other keys until all the icons have disappeared.

When the self-diagnosis has been completed successfully, PAS appears. If self-diagnosis fails,
error message Err 1 appears.

Note: You have to finish pressing all five keys within 2 minutes, otherwise Err 1 appears and you
will have to repeat the procedure.

5.5 Recover factory settings

 When the meter is off, press and hold & & together for 3

seconds, the screen displays

 Press

then restart the meter.

 Or press

to reset factory settings (MTC, slope and offset, etc.), displa y

to quit the setting, display then turn off the meter.

and blinks, this means “Reset”. There are 2 options:

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STARTER 3100 Bench pH Meter EN-17

Model

Measuring range

-2.00…16.00 pH

–

-5

Resolution

0.01 pH
1 mV

0.1

Error limits

± 0.01 pH
± 1 mV
± 0.5

Calibration

3 points
3 predefined buffer groups

Memory

99 measurements
The last calibration data

Power supply

AC Adapter Input: 100-240V ~ X.XA50/60 Hz
AC Adapter Output: 12V

X.XA

Size/weight

220 W x 175 D x 78 H mm / 0.75 kg
Display

Liquid crystal with backlight

Input

BNC, impedance > 10e+12 Ω
Cinch, NTC 30 kΩ

Reference input

2mm banana socket

Temperature-compensation

ATC & MTC

Housing

ABS

6 TECHNICAL DATA

6.1 Specifications

Ambient conditions

x Indoor use only
x Altitude: Up to 2000 m
x Specified Temperature range: 5 °C to 40 °C
x Humidity: maximum relative humidity 80 % for temperatures up to 30 °C decreasing linearly to

50% relative humidity at 40 °C

x Mains supply voltage fluctuations: up to ±10% of the nominal voltage
x Installation category II
x Pollution degree: 2
x Operability is assured at ambient temperatures between 5 °C to 40 °C

ST3100

1999…1999 mV

°C…110°C

°C

°C



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EN-18 STARTER 3100 Bench pH Meter

6.2 Compliance

This product conforms to the EMC Directive 2004/108/EC and the Low Voltage
Directive 2006/95/EC.

In conformance with the European Directive 2002/96/EC on Waste Electrical
and Electronic Equipment (WEEE) this device may not be disposed of in
domestic waste. This also applies to countries outside the EU, per their specific
requirements. Please dispose of this product in accordance with local
regulations at the collecting point specified for electrical and electronic
equipment. If you have any questions, please contact the responsible authority
or the distributor from which you purchased this device. Should this device be
passed on to other parties (for private or professional use), the content of this
regulation must also be related. Thank you for your contribution to
environmental protection.

FCC Note: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.

ISO 9001 Registration

In 1994, OHAUS Corporation, USA, was awarded a certificate of registration to ISO 9001 by
Bureau Veritus Quality International (BVQI), confirming that the OHAUS quality
management system is compliant with the ISO 9001 standards requirements. On June 21,
2012, OHAUS Corporation, USA, was re-registered to the ISO 9001:2008 standard.

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STARTER 3100 Bench pH Meter EN-19

7 BUFFER GROUP

STARTER 3100 automatically correct for the temperature dependence of the buffer group pH value
given in the following tables (b2, b3), you can find b1. (see 3.1.1)

Buffer group b2 Europe standard
Temp °C pH2.00 pH4.01 pH7.00 pH9.21 pH11.00
5 2.02 4.01 7.09 9.45 11.72
10 2.01 4.00 7.06 9.38 11.54
15 2.00 4.00 7.04 9.32 11.36
20 2.00 4.00 7.02 9.26 11.18

25 2.00 4.01 7.00 9.21 11.00

30 1.99 4.01 6.99 9.16 10.82
35 1.99 4.02 6.98 9.11 10.64
40 1.98 4.03 6.97 9.06 10.46
45 1.98 4.04 6.97 9.03 10.28
50 1.98 4.06 6.97 8.99 10.10

Buffer group b3 JJG119
Temp °C pH1.68 pH4.00 pH6.86 pH9.18 pH12.46
5 1.67 4.00 6.95 9.39 13.21
10 1.67 4.00 6.92 9.33 13.01
15 1.67 4.00 6.90 9.28 12.82
20 1.68 4.00 6.88 9.23 12.64

25 1.68 4.00 6.86 9.18 12.46

30 1.68 4.01 6.85 9.14 12.29
35 1.69 4.02 6.84 9.11 12.13
40 1.69 4.03 6.84 9.07 11.98
45 1.70 4.04 6.83 9.04 11.83
50 1.71 4.06 6.83 9.02 11.70

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EN-20 STARTER 3100 Bench pH Meter

Ohaus products are warranted against defects in materials and workmanship from the date of

LIMITED WARRANTY

delivery through the duration of the warranty period. During the warranty period Ohaus will repair,
or, at its option, replace any component(s) th at proves to be defective at no charge, provided that
the product is returned, freight prepaid, to Ohaus.
This warranty does not apply if the product has been damaged b y accident or misuse, exposed to
radioactive or corrosive materials, has foreign material penetrating to the inside of the product, or
as a result of service or modification by other than Ohaus. In lieu of a properly returned warranty
registration card, the warranty period shall begin on the date of shi pment to the authorized dealer.
No other express or implied warranty is given by Ohaus Corporation. Ohaus Corporation shall not
be liable for any consequential damages.

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