OHAUS STARTER 300D User manual

STARTER 300D
Portable DO Meter
Instruction Manual
Manual de instrucciones
Del medidor de OD portátil
STARTER 300D
STARTER 300D
Appareil de mesure portable de
l'oxygène dissous (OD)
Manuel d’instructions
STARTER 300D
Medidor Portátil de OD
Manual de Instruções

TABLE OF CONTENTS
1INTRODUCTION ...................................................................1
1.1 Definition of Signal Warnings and Symbols ...................................... 1
1.2 Safety Precautions ............................................................................ 2
1.3 Display and controls.......................................................................... 3
2INSTALLATION.....................................................................5
2.1 Package contents.............................................................................. 5
2.2 Installing the batteries ....................................................................... 5
2.3 Installing the electrode clip................................................................ 6
2.4 Installing the IP54 cover caps ........................................................... 6
2.5 Integrated stand for table top use ..................................................... 6
3SETUP...................................................................................7
3.1 Setting barometric pressure .............................................................. 7
3.1.1 Setting the barometric pressure unit ............................................. 7
3.1.2 Setting the barometric pressure value .......................................... 7
3.2 Setting salinity value ......................................................................... 7
3.3 Setting MTC value............................................................................. 8
3.3.1 Setting the temperature unit.......................................................... 8
3.3.2 Setting the MTC temperature value .............................................. 8
3.4 Setting the meter always working mode ........................................... 8
4STARTER 300D OPERATION ..............................................9
4.1 Calibration ......................................................................................... 9
4.1.1 Zero-oxygen solution..................................................................... 9
4.1.2 Performing 1-point calibration ....................................................... 9
4.1.3 Performing 2-point calibration ..................................................... 10
4.2 Sample measurement ......................................................................11
4.3 Temperature measurement ..............................................................11
4.4 Using the memory ............................................................................11
4.4.1 Storing a reading ..........................................................................11
4.4.2 Recalling from memory ............................................................... 12
4.4.3 Clearing the memory................................................................... 12
5MAINTENANCE ..................................................................13
5.1 Error message................................................................................. 13
5.2 Meter maintenance.......................................................................... 13
5.3 Electrode maintenance ................................................................... 13
5.4 Self-diagnosis.................................................................................. 14
5.5 Recover factory settings.................................................................. 14
6TECHNICAL DATA .............................................................15
6.1 Specifications ................................................................................ 15
6.2 Compliance ..................................................................................... 16

STARTER 300D Portable DO Meter EN-1
1 INTRODUCTION
Thank you for choosing OHAUS. Please read the manual completely before using the
STARTER 300D portable DO (Dissolved Oxygen) meter to avoid incorrect operation.
The STARTER 300D has an excellent performance/price ratio and is designed with many useful
features. Other accessories are also available from OHAUS.
Starter 300D offers many practical features such as:
·Ergonomic, multifunctional design for ambidextrous measurements or bench top use
·Salinity and barometric pressure compensation
·IP54 protection against dust and water
·Ohaus’ renowned user friendly software
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
injuries or death if not avoided.
CAUTION For a hazardous situation with low risk, resulting in damage to the
device or the property or in loss of data, or injuries if not avoided.
Attention For important information about the product.
Note For useful information about the product
Warning Symbols
General hazard
Explosion hazard
Corrosive hazard
Î
Alternating current
Ì
Direct current

EN-2 STARTER 300D Portable DO 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.
·Use the equipment only in dry locations.
·Dry off any liquid spills immediately. The instrument is not watertight.
·When using chemicals and solvents, comply with the instructions of the chemical producer
and the general lab safety rules.
·Use only approved accessories and peripherals.
·Operate the equipment only under ambient conditions specified in these instructions.
·Do not operate the equipment in hazardous or unstable environments.
·Service should only be performed by authorized personnel.

STARTER 300D Portable DO Meter EN-3
1.3 Display and controls
Displays
1
Electrode condition
Slope: 80-125%
Electrode
condition is
very good
Slope: 60-80%
Electrode
condition is not so good,
needs attention or cleaning
2
displays when manual endpoint, need to press button-Read to
lock the reading,
means auto endpoint mode, meter judges the endpoint(reading is stable)
and locks
the reading automatically.
3
Measurement icon - measurement or calibration is running
4
Calibration icon - calibration in progress
5
Setup icon - instrument is in the setup mode
6
Power always on icon
- Meter will not automatically turn off after 10 minutes
no
operation (see 4.4)
7
Battery status icon - fully charged, half-charged or fully discharged
8
ppm
, mg/L or % for
DO reading or calibration; mbar, hPa or mmHg for pressure entry; ppt
for salinity entry
9
Calibration point ; Memory number ; Error index
10
11
Auto
Temperature Compensation (ATC); Manual Temperature Compensation (MTC)
Temperature during measurement or Offset in calibration process
2
3
4
1
5
6
8
11
9
10
7

EN-4 STARTER 300D Portable DO Meter
Controls
Button
Press & release
Press & hold
for 3 seconds
-
Start or endpoint me
asurement
(manual endpoint mode)
-
Confirm setting, confirm
entered
value for setting
-
switch between
auto endpoint
and manual endpoint mode
,
-
Start calibration
- Review the latest calibration
data
-
Meter turn on
-
Back to measurement screen
-
Meter turn off
- Store current reading to memory
-
Increase value during setting
-
Scroll up through the memory
-
Recall stored data
-
Switch between ppm, mg/L
and
%measuring modes
-
Decrease value during setting
- Scroll down through the memory
-
Enter setup
- Start self-diagnosis

STARTER 300D Portable DO Meter EN-5
2 INSTALLATION
Carefully unpack the box.
2.1 Package contents
The ST300D-B (Basic) package has the following items:
In addition to ST300D-B package content, the ST300D package also includes:
Accessories:
Model
Description
P/N
STDO11
Galvanic DO electrode
30031639
STTEMP30
Temperature Electrode
83033970
DO Zero Oxygen Chemical
30059257
Wrist strap for portable meters
83032963
Clip Electrode for portable meters
83032964
Portable Bag for portable meters
30031635
2.2 Installing the batteries
§Remove the battery cover screw using a coin or screwdriver and remove the battery cover
§Insert the batteries in the battery compartment as shown
§Replace the battery cover and tighten the battery cover screw
ST300D-B
Units
STARTER 300D meter
1
AAA battery
4
Electrode Clip
1
IP54 cover caps
1 set
Wrist Strap
1
STDO11 (DO electrode with 1.0m cable)
1
STTEMP30 (temperature sensor)
1

EN-6 STARTER 300D Portable DO Meter
2.3 Installing the electrode clip
The electrode clip is an electrode holder that can be placed next to the display on either side of
the housing.
§Attach the clip by inserting the tabs into the recess.
§Slide the clip forward to lock in position. Slide the shaft of the sensor into the clip from above.
2.4 Installing the IP54 cover caps
Use the small plastic tool as shown:
2.5 Integrated stand for table top use
Starter 300D has an integrated table stand as shown, which can be pushed out to use the meter on
a lab bench or desk. To close the stand, push the middle edge of the stand toward the meter.

STARTER 300D Portable DO Meter EN-7
3 SETUP
3.1 Setting barometric pressure
For calibration and measurements, the actual barometric pressure is very important, since it
influences the dissolved oxygen value. Be sure to enter the CORRECT barometric pressure
before measurement and calibration.
3.1.1 Setting the barometric pressure unit
The meter can display the following units: mbar (milibar), hPa (hectopascal) and mmHg
(millimeter mercury).
§Power the meter on by pressing
§Press and hold button- for 3 seconds until setup icon appears on the display. The
current unit of barometric pressure displays.
§Press button- or button- to choose the unit you want.
§Press button- to confirm your selection or to return to the measurement screen.
3.1.2 Setting the barometric pressure value
After the setting of barometric pressure unit, the value of barometric pressure displays.
§Press button- or button- to adjust the value.
§Press button- to confirm your selection or press button- to return to the
measurement screen.
3.2 Setting salinity value
Since salinity has an influence on the dissolved oxygen value, it is important to enter the correct
salinity value. The meter can compensate salinity for measurements in solutions with salinity from
0 to 50 ppt. The default value for salinity is 0.0 ppt, which can be changed by the following
procedure:
After the setting of barometric pressure value, the salinity value is displayed.
§Press button- or button- to adjust the salinity value.
§Press button- to confirm the value or press button- to return to the measurement
screen.
Normally seawater salinity is 35ppt, which means 35g of salt per 1000g seawater.

EN-8 STARTER 300D Portable DO Meter
3.3 Setting MTC value
Please note: If a separate or built-in temperature electrode is used, the meter will enter Automatic
Temperature Compensation (ATC) mode. If the meter does not detect a temperature electrode, it
automatically switches to the Manual Temperature Compensation mode and MTC appears. MTC
temperature value should be set. (see 3.3.2)
3.3.1 Setting the temperature unit
After confirming the salinity value, the temperature unit appears on the display.
§Press button-
or button- to switch between °C and °F.
§Press button- to confirm the temperature unit you select or press to go back to
the measurement screen.
Note: °C = 5/9 (°F -32)
3.3.2 Setting the MTC temperature value
After confirming the temperature unit, the MTC temperature value appears on the display. .
§Press button- or button- to adjust the temperature value.
§Press button- to confirm the setting or press button- to return to measurement
screen.
The default setting is 25 °C (77°F).
3.4 Setting the 'Meter Always Working' mode
After confirming the compensation temperature value, the meter enters the meter always working
mode setting
§Press button- or button- to select “ON” or “OFF”.
§Press button- to confirm
Default setting is Meter always working mode is turned off. (select “OFF”), which means the meter
will turn off the power without any press operation after 10 minutes. So you can save the battery
life.
When the icon displays (select “ON”), it means the meter is always working and will NOT
automatically shut itself off after 10 minutes of no press operation.

STARTER 300D Portable DO Meter EN-9
4 STARTER 300D OPERATION
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 Zero-oxygen solution
The STARTER 300D allows you to perform 1-point or 2-point calibrations; normally a 1-point
calibration is enough. The 2-point calibration which is rarely performed must be run in a zero-
oxygen solution.
Preparing a zero-oxygen solution: put approximately 20ml of pure or deionized water into the
bottle of DO Zero Oxygen Chemical (30059257, there are about 5g powder in it), stir for at least 5
minutes. The solution is now prepared.
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 to ensure the meter is in Auto End point
Mode.
Auto or Manual End point Mode:
oPress and hold to change the End Point Mode.
oWhen in Manual Mode, to manually reach a pH measurement or calibration value,
you need to press button- when reading is stable and displays : then the
sample reading or calibration value freezes, blinks 3 times and freezes on
the display.
oWhen 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 blinks 3 times then disappears; blinks 3 times and freezes on
the display.
Before performing calibration, you must enter the correct barometric pressure in the meter (see
3.1). Please keep in mind the variation of barometric pressure depending on location, altitude,

EN-10 STARTER 300D Portable DO Meter
etc... An incorrect barometric pressure may negatively impact the calibration procedure and thus
affect the accuracy of your measurement.
Normally the DO electrode will only need to perform a 1 point calibration in the air (or Oxygen-
saturated water). Before calibration you need to rinse the DO electrode with pure water and
carefully wipe the water off with a tissue.
oPlace the electrode in the air.
oPress button-
The calibration icon and the measurement icon appear
on the display. is blinking during calibration.
oThe meter reaches endpoints according to the Endpoint Mode, 100% will display.
oOnce you have completed your 1-point calibration, you have 3 options:
oPress button- to finish 1-point calibration, slope and offset are shown on the
display then return to measurement screen.
oPress button- to reject calibration and return to measurement screen.
oPress button- to complete a 2-point calibration (after preparing the zero
oxygen solution).
4.1.3 Performing 2-point calibration
§Perform the 1-point calibration as described above in "Performing 1-point calibration".
§Place the electrode in the zero oxygen solution and press button-
The measurement icon appears on the display. The icon is blinking during the calibration
measurement. The meter reaches the endpoint according to the preselected endpoint mode (Auto
endpoint mode will arrive endpoint automatically while manual endpoint requires pressing button-
).
You now have 2 options:
vPress button- to finish the 2-point calibration, slope and offset are shown on the display
then return to measurement screen.
vPress button- to reject calibration and return to measurement screen.
Pressing and holding button- will display the last calibrate data when in measurement
screen.

STARTER 300D Portable DO Meter EN-11
4.2 Sample measurement
Dissolved oxygen readings can display unit of ppm, mg/L or %. You have the option of choosing
the unit according your application by pressing button-
when on the measurement screen.
When measuring the sample, please note:
oThe sample must be stirred
oBe sure the minimum water flow rate is 5 cm/second across the electrode membrane.
Then
§Place the DO electrode in the sample.
§Press to start the measurement.
The measurement icon appears on the display. The measurement icon is blinking during
measurement. When the meter reaches its endpoint, the measurement result displays on the
screen.
4.3 Temperature measurement
For better accuracy, we recommend the use of the temperature probe. If a temperature probe is
used, ATC and the sample temperature are displayed.
If the meter does not detect a temperature probe, it automatically switches to the manual
temperature compensation mode and MTC appears. MTC temperature should be set. (See 3.3)
Note: The meter will only accept NTC 30 kΩ temperature sensor.
4.4 Using the memory
4.4.1 Storing a reading
The STARTER 300D can store up to 30 results. Press button- when the measurement reaches
its final reading. M01 indicates that one result has been stored.
If you press button- when M30 is displayed, FUL indicates the memory is full. To store further
data you will have to clear the memory (see 4.4.3).

EN-12 STARTER 300D Portable DO Meter
4.4.2 Recalling from memory
·Press and hold button-
for 3 seconds to recall the stored values from memory
when the current measurement reaches endpoint.
·Press button- or button- to scroll through the stored results. R01 to R30
indicates which result is being displayed. Press button- to go back to the
measurement screen.
4.4.3 Clearing the memory
Continue pressing button- or button- to scroll through the stored results until MRCL
appears. Then press button- , CLr blinks. Press button- again to confirm the deletion or
press button- to return to the measurement mode without deleting all the data in the
memory.

STARTER 300D Portable DO Meter EN-13
5 MAINTENANCE
5.1 Error message
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
Make sure that the electrode setting cap has been
removed and
the electrode is properly con
nected
and placed in the sample solution.
Error 3
Measured
buffer
temperature
out of range (<0°C or >50 °C)
Keep the
standard buffer
temperature within the
range for calibration or measurement.
Error 4
Cal 2 out of range
Make sure the buffer is correct and fresh;
Clean or replace the DO electrode.
Error 5
Cal 1 out of range
Make sure the buffer is correct and fresh;
Clean or replace the DO electrode.
Error 9
The current data
set has
already been stored once
A measurement can only be stored once. Perform
a new measurement to store a new data set.
Any more problems, you can contact Ohaus sales rep.
5.2 Meter maintenance
Never unscrew the two halves of the housing!
The STARTER 300D does not require any maintenance other than replacement of depleted
batteries. To clean, use a damp cloth.
The housing is made of acrylonitrile butadiene styrene (ABS). This material is susceptible to
damage by some organic solvents, such as toluene, xylene and methyl ethyl ketone (MEK). Any
spillage should be immediately wiped off.
5.3 Electrode maintenance
The DO sensor measures the oxygen based on galvanic principle. The DO electrode produces a
mV-output proportional to the oxygen concentration present in the sample. Oxygen diffuses
through the membrane and is being consumed at the cathode, producing an electrical current.
oAlthough the amount of oxygen consumed is low, a new sample should still flow
past the membrane to prevent false readings.
oFor maximum lifetime and maximum accuracy, the sensor should be handled with
the proper care.
oBefore and after use, rinse the sensor with clean pure water and wipe it with a soft
tissue.

EN-14 STARTER 300D Portable DO Meter
When storing the sensor for a longer period, make sure it is placed in the wetting cap supplied in
the standard delivery. Also, deposits on the membrane should be removed with a tissue, because
they hamper the diffusion of oxygen through the membrane.
Note: The filling solution in the electrode cap is 10% NaCl (Sodium Chloride). Cleaning and filling
solutions should be handled with the same care as that given to toxic or corrosive substances.
5.4 Self-diagnosis
§Press and hold
& simultaneously until the meter display 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 bblinks, five icons are displayed.
§Press the five keys one by one 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 two 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 “RST”and blinks, press to reset factory settings (MTC, slope and
offset, etc.).
§Press to switch off the meter.

STARTER 300D Portable DO Meter EN-15
6 TECHNICAL DATA
6.1 Specifications
Ambient conditions
·Altitude: Up to 2000 m
·Specified Temperature range: 5°C to 40°C
·Humidity: maximum relative humidity 80 % for temperatures up to 30°C decreasing linearly to
50% relative humidity at 40°C
·Installation category: N/A
·Pollution degree: N/A
·Operability is assured at ambient temperatures between 5°C to 40°C
Model: ST300D
Measurement Range
%
0.0 to 199.9%; 200 to 400%
mg/L
0.00 to 19.99; 20.0 to 45.0 mg/L
ppm
0.00 to 19.99; 20.0 to 45.0 ppm
Temp.
0 to 50 °C
Measurement Resolution
%
0.1%; 1%
mg/L
0.1 mg/L; 1mg/L
ppm
0.01 ppm; 0.1 ppm
Temp.
0.1 °C
Barometric range
mmHg
375 to 825 mmHg
mbar
500 to 1100 mbar
hPa
500 to 1100 hPa
Barometric resolution
mmHg
1 mmHg
mbar
1 mbar
hPa
1 hPa
Accuracy
± 1% ; ± 0.3 °C
Temp compensation
ATC&MTC
Salinity compensation
0.0 to 50.0 ppt
Calibration
2 points
Memory
30 sets, last calibration data
Power
4 x AAA(LR03) batteries, 250 hrs
Size/Weight
90 W x 150 D x 35 H mm
Weight
0.16kg
Display
liquid crystal
IP rating
IP54
T input
Cinch, NTC 30 kΩ
Materials
ABS

EN-16 STARTER 300D Portable DO Meter
Compliance
This product conforms to the EMC Directive 2004/108/EC and the Low Voltage
Directive 2006/95/EC. The Declaration of Conformity is available online at
europe.ohaus.com/europe/en/home/support/compliance.aspx.
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. Disposal instructions in Europe are available
online at europe.ohaus.com/europe/en/home/support/weee.aspx. 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.