Related Manuals for OHAUS ST400
Summary of Contents for OHAUS ST400
- Page 1 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com ST400 Portable pH Meter and ST400M Portable Multi Parameter Meter Instruction Manual...
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Page 3: Table Of Contents
Safety Precautions ................2 Display and controls ................3 INSTALLATION ..............6 Package contents ................6 Meter charging .................. 8 Connect the electrodes ..............8 ST400 ST400M OPERATION ..........9 Menu directory ................... 9 Setup ....................10 3.2.1 System setup ................10 3.2.2 pH Setting ................. - Page 4 Compliance ..................23 Appendix ................24 Table 1 BUFFER GROUP ............... 24 Table 2 Examples of temperature coefficients (α-value) ....26 Table 3 Conductivity standards ............27...
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Page 5: Introduction
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: •... -
Page 6: Safety Precautions
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;... -
Page 7: Display And Controls
ST400 & ST400M Portable Meter EN-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. - Page 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.
- Page 9 ST400 & ST400M Portable Meter EN-5 Controls button Press & release Press & hold for 3 seconds Exit and return to Meter turn on/turn off measurement screen Start calibration Start or stop measurement - Store current reading to memory - Scroll up through the memory...
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Page 10: Installation
Units Remarks ST400 Rubber cover Adapter 5V Nylon, Belt USB cable In addition to ST400/B content, ST400/F package also include the electrode and buffer powder. . STARTER 400 /F Units Remarks ST400/B 3-in-1 plastic refillable pH IP67 ST320 Electrode, 3 m cable 4.01；7.00；... - Page 11 Portable bag Each pH buffer powder should be dissolved in 250ml pure water or deionized water in a volumetric flask. You can also order the bottled buffer solution from Ohaus. Additional electrodes, solutions, accessories and spare parts are available. Please contact...
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Page 12: Meter Charging
ST400 & ST400M Portable Meter Meter charging The ST400 and ST400M are rechargeable portable meters. The real-time power supply status will be displayed on the upper right corner of the screen. The red light on the upper left corner of the screen will be flashing to indicate low power, which reminds user to charge the meter. -
Page 13: St400 St400M Operation
ST400 & ST400M Portable Meter EN-9 ST400 ST400M OPERATION Long press button for 2 seconds to turn on the meter. After turning on the meter, the default mode is pH mode, press ▲ button and ▼ button to switch between pH and mV, press button to switch to conductivity mode, press ▲... -
Page 14: Setup
EN-10 ST400 & ST400M Portable Meter Setup 3.2.1 System setup In the measurement mode, long press button (more than 3 seconds) to enter the setup mode. Press ▲ button and ▼ button to select the system settings, press button to enter the system settings. -
Page 15: Conductivity Setting
ST400 & ST400M Portable Meter EN-11 Temperature (MTC mode); if MTC mode is used, all buffers and sample solutions should be kept at the same setting temperature as far as possible. In order to ensure accurate measurement of the pH value, the pH electrode should be regularly calibrated. -
Page 16: Sensor Management
EN-12 ST400 & ST400M Portable Meter Temperature unit, Celsius or Fahrenheit；Note: ° C = 5/9 (° F - 32) Alpha-Coefficient: For different samples, the conductivity value varies with temperature. Generally, the default value of Alpha-Coefficient for ordinary water sample is 2%/° C . If you set the temperature correction coefficient value as 0 %/°C, that means NO Temperature Compensation... -
Page 17: Ph Calibration
ST400 & ST400M Portable Meter EN-13 Reset all: Reset settings and delete all the calibration and measurement data. Please restart the instrument after confirmation. pH Calibration 3.3.1 Buffer group Meters can perform 1-5 point calibrations. The purpose of the calibration is to convert the corresponding electrical signal (mV value) of the pH electrode to a pH value. -
Page 18: Performing 1-Point Calibration
The corresponding calibration buffer is displayed and stored. The 1-point calibration is finished. There are now 2 options (OHAUS recommends conducting at least a 2-point calibration); When performing calibration, Ohaus recommends using Auto End Point Mode. -
Page 19: Mv Measurement
ST400 & ST400M Portable Meter EN-15 Press to start the pH measurement, “measuring” appears on the display. Auto or manual endpoint mode can be used, the pH value with the temperature will display on the screen with an asterisk on the left. -
Page 20: Conductivity Calibration
EN-16 ST400 & ST400M Portable Meter to select between five conductivity buffers. press button to confirm setting. Then press button to return to the measuring mode or continue to set other parameters. The predefined standard buffers of the meter are 10 μS/cm, 84 μS/cm, 500 μS/cm, 1413 μS/cm and 12.88 mS/cm, and the actual conductivity of different temperature is built-in in the meter program. -
Page 21: Two-Parameter Measurement
The meter can connect the computer through the Micro-USB cable and export the storage result directly. Do not measure when connecting to the computer! The steps are as follows: Connection meter and computer Confirm that the software (Scalemate) has been installed on the computer. Go to Ohaus website, Support→Software and Drivers. -
Page 22: Maintenance
Meter maintenance Do not disassemble the meter! The ST400 series instruments do not require any maintenance other than replacement of depleted batteries. To clean, use a damp cloth. Attention: Do not use solvents or harsh chemicals to clean the instrument. -
Page 23: Electrode Maintenance
ST400 & ST400M Portable Meter EN-19 Electrode maintenance For pH electrode: Make sure that the electrode is always stored in the storage solution in a protective bottle. Do not dry it out. Avoid storage in distilled water. The storage solution is 3M KCl solution. Please pay attention to whether the reference solution is leaked or crystallized. - Page 24 EN-20 ST400 & ST400M Portable Meter ST400 pH： Digital measuring range -2.00～16.00 pH -1999～1999 mV -5 °C～110 °C Resolution 0.01 pH 1 mV 0.1 °C Error limits ± 0.01 pH ± 1 mV ± 0.5 °C Buffer groups Calibration 1-5 point...
- Page 25 ST400 & ST400M Portable Meter EN-21 ST400M pH： -2.00～16.00 pH Measuring range -1999～1999 mV -5 °C～110 °C Resolution 0.01 pH 1 mV 0.1 °C Error limits ± 0.01 pH ± 1 mV ± 0.5 °C Buffer groups Calibration 1-5 point...
- Page 26 EN-22 ST400 & ST400M Portable Meter ST400M Conductivity： Measuring range 0.00 μS/cm～199.9 mS/cm 0.1 mg/l～199.9 g/l (TDS) 0.00 ～ 99.99 psu (salinity) 0.00 ～ 20 MΩ.cm (resistivity） -5 ° C ～110 °C Resolution Auto range 0.1 °C Error limits ± 0.5 % F.S.
- Page 27 2006/66/EC (Batteries). Please dispose of this product in accordance with local regulations at the collecting point specified for electrical and electronic equipment. For disposal instructions in Europe, refer to www.ohaus.com/weee. 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.
- Page 28 EN-24 ST400 & ST400M Portable Meter Appendix Table 1 BUFFER GROUP ST400M automatically corrects for the temperature dependence of the buffer group pH value given in the following tables. Buffer group 1 US standard Temp° C pH1.68 pH4.01 pH7.00 pH10.00 1.67...
- Page 29 ST400 & ST400M Portable Meter EN-25 Temp °C 1.680 4.003 6.864 9.182 12460 1.669 3.999 6.949 9.391 13.210 1.671 3.996 6.921 9.330 13.011 1.673 3.996 6.898 9.276 12.820 1.676 3.998 6.879 9.226 12.637 1.680 4.003 6.864 9.182 12.460 1.684 4.010 6.852 9.142 12.292 1.688 4.019 6.844 9.105 12.130...
- Page 30 EN-26 ST400 & ST400M Portable Meter Table 2 Examples of temperature coefficients (α-value) Substance at 25 °C Concentration [%] Temperature coefficient α [%/°C] 1.56 1.88 CH3COOH 1.69 NaCl 2.14 H2SO4 1.28 7.20 α-coefficients of conductivity standards for a calculation to a reference temperature of 25°C...
- Page 31 Ohaus. In lieu of a properly returned warranty registration card, the warranty period shall begin on the date of shipment to the authorized dealer.
- Page 32 Ohaus Corporation *30393250* PN 30393250 C © Ohaus Corporation 2018, all rights reserved 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com...