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Liquisys COM223/COM253 Dissolved Oxygen Commissioning Guide​
Latest company news about Liquisys COM223/COM253 Dissolved Oxygen Commissioning Guide​
I. Commissioning Procedure
(1) Key Functions
  • CAL Key: Activates calibration mode and displays the calibration menu.
  • + Key: Increases numerical values.
  • - Key: Decreases numerical values.
  • E Key: Confirms selections.
  • REL1/REL2 Keys:
    • REL1: Manual operation of Relay 1.
    • REL2: Toggles Relay 2 between manual/auto modes.
(2) Probe Inspection & Calibration
  1. Install the probe with a membrane cap filled with electrolyte.
  2. Expose the probe to air (avoid direct sunlight). Ensure ambient temperature is 20 -25°C.
  3. Connect the probe to the transmitter and press CAL. Enter password 22.
  4. Select "Air Calibration" and press E to confirm.
  5. The displayed value will start at 600 and gradually decrease to 0. If no error codes appear, calibration is complete.
Valid Calibration Parameters
  • Altitude: Display must stabilize between 6.00 -11.20 mg/L or 85 -157% SAT.
  • Salinity: Display must stabilize between 9.20 -9.30 mg/L or 102% SAT.
(3) Range Setup
Step A: Unit Configuration
  1. From the main menu, press E -> enter Code 0 -> press + until 22 -> press E.
  2. Navigate to Setup1 -> E -> Unit -> use +/- to select mg/L -> press E.
Step B: Output Configuration
  1. From the main menu, press E -> enter Code 0 -> press + until 22 -> press E.
  2. Press - twice -> navigate to Output -> press E twice -> select 4 -20mA.
  3. Set the 4mA corresponding value (e.g., minimum DO level) -> press E.
  4. Set the 20mA corresponding value (e.g., maximum DO level) -> press E.
II. Installation & Maintenance Guidelines
  1. Weekly Maintenance:
    • Gently rinse the DO probe with clean water.
    • Replace the membrane cap immediately if damaged.
    • Replace contaminated electrolyte promptly.
    • Avoid applying tension to the probe cable.
  2. Application Warnings:
    • Municipal Wastewater: Safe for standard use.
    • Industrial Wastewater: Verify water composition. Harmful substances (e.g., H₂S, ammonia, benzene, phenol) can degrade the membrane.
    • Hazardous Chemicals: Frequent membrane replacement is required in environments with aggressive agents.
Pub Time : 2025-08-13 16:17:10 >> News list
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