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Infinite L-com SRWQ100-DO103-8901 User Manual

Dissolved oxygen sensor (water quality analysis)
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DISSOLVED OXYGEN SENSOR
(WATER QUALITY ANALYSIS)
User Manual for SRWQ100-DO103-8901
Thank you for choosing L-com product. To ensure safe, accurate performance and product
longevity, please take a moment to familiarize yourself with this manual before powering the
device. Please keep it handy for future reference. In case of any questions regarding the
installation or use of product, please call us at 800.341.5266.
Reach out to us at customerservice@l-com.com and visit our website at www.l-com.com
1
Signal Line

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Summary of Contents for Infinite L-com SRWQ100-DO103-8901

  • Page 1 DISSOLVED OXYGEN SENSOR (WATER QUALITY ANALYSIS) User Manual for SRWQ100-DO103-8901 Signal Line Thank you for choosing L-com product. To ensure safe, accurate performance and product longevity, please take a moment to familiarize yourself with this manual before powering the device. Please keep it handy for future reference. In case of any questions regarding the installation or use of product, please call us at 800.341.5266.

  • Page 2: Technical Indicators

    Technical Indicators Measuring Range 0.00 20.00 mg/L Resolution 0.01 mg/L Accuracy ±0.2% FS Temperature Range 60.0 ˚C Resolution 0.1 ˚C Accuracy ±0.2 ˚C Pressure Range 2 bar Medium Flow Rate 30 L/h Shell Material ABS, 316 L Output RS485, 4 20 mA Power Supply 30 VDC (Recommend 12V)
  • Page 3 Electrode Outlet Procedure to Add Electrolyte and Replace the Membrane Head  Kindly check the new membrane head is added with electrolyte before use.  It is recommended to replace the electrolyte every three months. Also, it is subjected to the specific use of the measured medium and electrode.

  • Page 4: Electrode Polarization

    Electrode Polarization Polarization Method: Put the electrode in the solution to be tested. Connect the power supply. Polarization starts as soon as the power is turned ON. Polarization Cases: The electrodes needs to be polarized in the following cases:  When the electrode is first used, polarize it for more than 6 hours.
  • Page 5 During Immersion Installation  During installation procedure, there will be frequent dirt on electrode, clean it regularly.  Measuring value is not stable.  Different insertion depths affects the measured value.  The position of the electrode must be above the sediment. Electrode Communication Default Communication Instructions: ...
  • Page 6 Read Floating Point Number Host Computer Transmission Format: Func- Register Start Qty. Of CRC16 Address tion Address Registers Code High High High Byte Byte Byte Byte Byte Byte Eg: Read 0x01 0x03 0x00 0x01 0x00 0x02 0xCB 0x95 Measured Value Eg: Read 0x01 0x03...
  • Page 7 Write Floating Point Number Host Computer Transmission Format: Func- Register Qty. Of Register Data in CRC16 tion Start Registers Hexadecimal Floating Code Address Byte Point Number High High High Byte Byte Byte Byte Byte Byte 0x01 0x10 0x00 0x12 0x00 0x02 0x04 0x2A 0x63 Write Value...
  • Page 8 Calibration Instructions The First Point: Zero Calibration:  The sensor is cleaned, dried and put in a O mg/L solution (i.e., anhydrous sodium sulfite solution)  Send command: 01 03 00 66 00 01 64 15  After the measured AD value is stable, read the AD value in the Ox66 register. ...
  • Page 9 Hosting Data Read/ Name Length Description Type Write Number Floating Storage location for measured Measurements 0x 00 01 Point value Default value 200%, Upper limit of Upper Limit Of Floating 0x 00 0A measured value (20mA Point Measurement corresponding value) Default value 0, Lower limit of Lower Limit Of Floating...
  • Page 10 Common Instruction Examples Function Send command Return command Remarks The 2C814091 Read 01 03 04 2C 81 40 change order is 01 03 00 01 00 02 95 CB measured 91 52 E7 40912C81 and its value floating point is 4.53 The 723741DB Read 01 03 04 72 37 41...

  • Page 11: Maintenance And Storage

    Function Send command Return command Remarks Pressure 01 10 00 2C 00 02 04 00 Write pressure 01 10 00 2C 00 02 compensation compensation 80 01 written to 1000 00 44 7A 43 01 mbar Read The CCCD3E4C order 01 03 04 CC CD 3E 01 03 00 22 00 02 64 01 is 3E4CCCD and its...

  • Page 12: Modbus Troubleshooting

    Troubleshooting  If the measurement is not accurate, its mostly because the condition of dissolved oxygen electrode has changed. So it is necessary to check whether the dissolved oxygen electrode is in good condition or not.  The dissolved oxygen electrode is not easy to damage, generally the membrane head may has dirt ,the electrolyte maybe polluted or lost etc., user needs to replace the membrane head or add / change electrolyte.

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