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4.2.3 D.O. Sensor Activation
The D.O. probe is shipped dry. To prepare the sensor for use:
• Remove the black & red plastic cap. This cap is used for shipping purposes
only and can be thrown away.
• Insert the supplied O-ring in to the membrane cap.
• Rinse the membrane with some electrolyte solution. Refill with clean electrolyte.
Gently tap the membrane cap to dislodge air bubbles. To avoid damaging the
membrane, do not touch it with your fingers or directly tap the membrane.
• With the sensor facing down screw the membrane cap counterclockwise to the
end of the threads. Some electrolyte will overflow.
• Rinse outside of sensor with deionized water.
• Invert sensor and inspect. There should be no bubbles or debris between the
membrane and sensor body.
4.2.4 EC Sensor Preparation
The EC sensor does not need to be soaked or hydrated before use. Use the small
brush included in the probe maintenance kit to clean and loosen any debris
before using.
4.3 SENSOR INSTALLATION
The HI 7698194 can support three different
sensors: Connector 1: pH, pH/ORP
Connector 2: D.O.
Connector 3: EC.
To make installation easier, the sensors have color-
coded caps and the sockets are identified with
colored triangles, corresponding to the colors of
the sensors (pH - red; EC - blue; DO - white).
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The HI 7698195 support two different sensors:
Connector 1: pH, pH/ORP
Connector 2: EC
The HI 7698196 support two different sensors:
Connector 1: pH, pH/ORP
Connector 2: DO
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