OHAUS ST400 User manual
ST400 Portable pH Meter and
ST400M Portable Multi Parameter Meter
Instruction Manual
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
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 ..................................................................... 6
2.1 Package contents .............................................................................. 6
2.2 Meter charging .................................................................................. 8
2.3 Connect the electrodes ..................................................................... 8
3ST400 ST400M OPERATION ................................................ 9
3.1 Menu directory ................................................................................... 9
3.2 Setup ............................................................................................... 10
3.2.1 System setup ............................................................................ 10
3.2.2 pH Setting ................................................................................. 10
3.2.3 Conductivity Setting* ................................................................. 11
3.2.4 Sensor management ................................................................ 12
3.2.5 Data management .................................................................... 12
3.2.6 Factory reset............................................................................. 12
3.3 pH Calibration .................................................................................. 13
3.3.1 Buffer group .............................................................................. 13
3.3.2 Performing 1-point calibration .................................................. 14
3.3.3 Performing Multi-point calibration ............................................. 14
3.4 pH measurement ............................................................................. 14
3.4.1 pH measurement ...................................................................... 14
3.4.2 mV measurement ..................................................................... 15
3.4.3 Temperature measurement ...................................................... 15
3.5 Conductivity calibration* .................................................................. 15
3.5.1 Setting the standard buffer ....................................................... 15
3.5.2 Conductivity calibration ............................................................ 16
3.5.3 Conductivity measuring ............................................................ 16
3.5.4 TDS, Salinity and resistivity measuring .................................... 16
3.6 Two-parameter measurement* ....................................................... 17
3.7 Using the memory ........................................................................... 17
3.7.1 Storing a reading ...................................................................... 17
3.7.2 Review from memory ............................................................... 17
3.7.3 Clearing the memory ................................................................ 17
3.7.4 Export the stored data .............................................................. 17
4MAINTENANCE .................................................................. 18
4.1 Error message ................................................................................. 18
4.2 Meter maintenance.......................................................................... 18
4.3 Electrode maintenance ................................................................... 19
5TECHNICAL DATA ............................................................. 19
5.1 Specifications ................................................................................ 19
5.2 Compliance ..................................................................................... 23
6Appendix ............................................................................ 24
6.1 Table 1 BUFFER GROUP ............................................................... 24
6.2 Table 2 Examples of temperature coefficients (α-value) .............. 26
6.3 Table 3 Conductivity standards ....................................................... 27
ST400 & ST400M Portable Meter EN-1
1 INTRODUCTION
Thank you for choosing OHAUS.
Please read the manual completely before using the ST400 portable pH and ST400M portable pH
& conductivity meter to avoid incorrect operation.
ST400 series have an excellent performance and are designed with many useful features. Ohaus
also offers other accessories such as electrodes for different applications as well as buffer
solutions.
ST400 & ST400M have many unique designs: including IP67 waterproof and dustproof design,
rechargeable lithium battery; large LCD display, data storage, and indication of electrode status.
You will find more practical features of the ST400 & ST400M in use. Some of these features
include:
•pH and conductivity* measurements with 1000 sets of data storage;
•Dot matrix LCD display, showing a clear reading;
•Multiple sets of pH buffer groups and multiple conductivity standards*, adaptable to your
different needs;
•Work with Ohaus IP67 pH electrode and conductivity electrode*, truly waterproof and suitable for
harsh environments.
* Only applies to ST400M.
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
~
Alternating current
Direct current
EN-2 ST400 & ST400M Portable 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.
Verify that the AC adapter's input voltage range and the plug type are compatible with the
local AC mains power supply.
Make sure that the power cord does not pose a potential obstacle or tripping hazard.
Do not position the equipment such that it is difficult to reach the power connection.
Operate the equipment only under ambient conditions specified in these instructions.
Do not operate the equipment in hazardous or unstable environments.
Disconnect the equipment from the power supply when cleaning.
Use only approved accessories and peripherals.
When shipping or transporting this product, follow the applicable regulations for equipment
containing lithium-ion batteries.
Service should only be performed by authorized personnel.
Intended Use
Use the equipment exclusively for measuring the parameters described in these operating
instructions. Any other type of use and operation beyond the limits of technical specifications,
without written consent from OHAUS, is considered as not intended.
This instrument complies with current industry standards and the recognized safety regulations;
however, it can constitute a hazard in use.
If the instrument is not used according to these operating instructions, the intended protection
provided by the instrument may be impaired.
ST400 & ST400M Portable Meter EN-3
1.3 Display and controls
Connections
*Only applies to ST400M
pH Displays
1. User ID
2. Sample ID
3. Battery status icon
4. Endpoint mode
5. Electrode slope and offset
6. pH
7. ATC or MTC, temperature
8. mV
9. Calibrated pH points
10. Date and time
2
1
3
7
9
10
4
5
6
8
EN-4 ST400 & ST400M Portable Meter
Conductivity Displays*
1. User ID
2. Sample ID
3. Battery status icon
4. Endpoint mode
5. Cell constant (K) and temperature correction coefficient value
6. Reference temperature
7. Conductivity / TDS / Salinity / Resistivity
8.ATC , temperature
9. Calibrated conductivity point
10. Date and time
Two-parameter Displays*
*Only applies to ST400M
5
2
3
1
4
9
8
6
10
7
pH/mV
Conductivitiy/
TDS/
Salinity/
Resistivity
ST400 & ST400M Portable Meter EN-5
Controls
button
Press & release
Press & hold for 3
seconds
Exit and return to
measurement screen
Meter turn on/turn off
Start calibration
Start or stop measurement
- Store current reading to
memory
- Scroll up through the memory
- Switch pH and conductivity*
- confirm setting
Enter setup mode
- Increase value during setting
- Decrease value during
setting
- switch between Conductivity,
TDS, Salinity and Resistivity*
- switch between pH and mV
*Only applies to ST400M
EN-6 ST400 & ST400M Portable Meter
2 INSTALLATION
Carefully remove your meter and each of its components from the box.
2.1 Package contents
ST400 is available in three different package configurations:
ST400 /B is the basic package, doesn't contain electrodes;
In addition to ST400/B content, ST400/F package also include the electrode and buffer powder. .
In addition to ST400/F content, ST400 /G also includes a portable bag.
STARTER 400 /B
Units
Remarks
ST400
1
Rubber cover
1
Adapter 5V
1
Nylon, Belt
1
USB cable
1
STARTER 400 /F
Units
Remarks
ST400/B
1
IP67 ST320
1
3-in-1 plastic refillable pH
Electrode, 3 m cable
Buffer powder set
1
4.01；7.00； 10.01
STARTER 400 /G
Units
Remarks
ST400 /F
1
Portable bag
1
This manual suits for next models
7
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