EUTECH INSTRUMENTS ALPHA CON 1000 CONDUCTIVITY CONTROLLERTRANSMITTER (REVISION 3) Manuel d'instructions télécharger pdf (Page 14)

6 TDS CALIBRATION

IMPORTANT: When Calibration mode is entered, controller automatically goes into a

“HOLD” mode where the 4-20 mA output freezes and relays are de-activated (if it was in

an activated condition). Upon return to measurement mode, both 4-20mA output and

relay activities resume, depending on settings.

The αlpha TDS 200 controller includes 8 total dissolved solids measurement ranges.

One-point slope calibration is possible, in each range.

Choose fresh standard solutions, whose value is reasonably close to the measurement

value.

Before calibration, make sure electrode is clean. Use iso-propyl alcohol followed by

thorough rinsing in distilled water to clean electrode.

Important: To achieve a successful TDS calibration, two conditions must be satisfied:

1. Difference between measured value of standard solution, and actual value of

standard solution, must be within ± 40 %.

(e.g. if value of standard solution is 500 ppm, then allowable measured

values by controller must be within 700 ppm {+ 40%} and 300 ppm{- 40%});

and

2. the lowest possible value must be at least 10% of full scale

(e.g. if range of 0 to 1000 ppm is selected, min. measured value at

calibration, must be at least 100.0 ppm).

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EUTECH INSTRUMENTS ALPHA CON 1000 CONDUCTIVITY CONTROLLERTRANSMITTER (REVISION 3) Manuel d'instructions Page 14