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pH-EC Flow Control 5000

Continuous monitoring of pH and EC

pH-EC Flow Control 5000 allows simultaneous, continuous monitoring of pH, conductivity (indication as EC and TDS) and temperature of solutions.

Based on the latest microprocessor technology, the instrument has completely been developed and manufactured by STEP Systems in Germany.

The automatic sensor and buffer recognition makes operating errors and misstatements almost impossible – safety of correct application has been perfected.

Inverse indication of measured values when exceeding or dropping below the individually set limits ensures timely intervention in case of failures. The risk of over-fertilization or under-supply of plants by incorrectly adjusted fertilizer mixing systems is minimized.

With an additional relay card (version with relay output), an external alert system like bells, signal lamps etc. can be connected to the integrated outputs and provides a continuous control of dosing systems.

By exceeding or dropping below the freely adjustable limits:
  • Version without relay output: inverse graphic indication
  • Version with relay output: inverse graphic indication and possibility of alert system and/or control function for dosage pumps.
The display shows values simultaneously:
  • pH
  • conductivity
  • TDS
  • temperature

Owing to suspension eye the unit can easily be wall-mounted and the optional tube-fitting kit enables an easy and fast installation and deinstallation of the probes (e.g. in case calibration or replacement).

Menu languages: German, English, Russian (optional).

Technical data:

  • Measuring range: рН 0 – 14; ЕС 0 – 200 mS/cm; TDS 0 – 106 000 ppm; t° -20…+80 °С
  • Resolution: 0.01 рН; ЕС 0.01 mS/cm; TDS 1 ppm; t° 0.1 °С
  • Accuracy: ± 0.02 рН; ± 0.5 °С; ЕС/TDS ±2% of measured value
  • Temp.- comp.: with integrated NTC temperature sensor
  • pН calibration: automatic, at рН 4, pH 7 or pH 10
  • EС calibration: automatic, at 0.084 /1,41 / 5.0 / 12.88 / 111.8 mS/cm
  • EC probe: EC plastic housing probe, 8-pin plug, 110 cm cable
  • рН probe: gel-filled pH electrode, BNC plug, 110 cm cable
  • Max. pressure: 5 bar
  • Alarm: visual inverse graphic indication. Version with relay output: visual and 2 x relay output, Ø 3.5 mm, max. 50 Vac / 1А
  • Alarm delay: 0-255 s after exceeding or dropping below the limits
  • Conversion factor EC-TDS: automatic
  • Power: 9 V with external power supply (continuous operation) or 9 V with block battery > 3,000 measurements (short time operation)
  • Dimensions: 83 х 180 х 55 mm
  • Weight: 300 g (basic unit)
  • Data logger function (optional): memory: ca. 2,620 measuring values / measuring rate: 1 min – 24 h

Delivery contents:

  • pH-EC Flow Control 5000 basic unit
  • pH flow-through electrode
  • buffer solutions pH 4 and pH 7 (each 100 ml)
  • EC flow-through electrode
  • calibration solutions 1.4 mS and 111.8 mS (each 50 ml)
  • 2 x tube-fitting kits
  • 9 V battery
  • power supply, cable length 160 cm
  • operation manual

Product number to order:

Item-No.: 52030A – pH-EC Flow Control 5000, set
Item-No.: 52030R – pH-EC Flow Control 5000 with relay output, set
Item no.: 10140 – Data logger function
Item no.: 90079 – Connection cable 8-pin to USB


Instruction manual as PDF file.