Hach 6120118 user manual The Digital Gateway, Operating Precaution, General Information

General Information

Figure 3 Insertion Style Sensor with Domed Electrode

22.2 mm (0.875 inches)

149.9 mm (5.9 inches)

Figure 4 Sanitary-style Sensor

22.2 mm (0.875 inches) 49.1 mm (1.96 inches)

22 mm (0.87 inches)

88.9 mm (3.5 inches)

187.3 mm (7.37 inches)

2.3 The Digital Gateway

The digital gateway was developed to provide a means to use existing analog sensors with the new digital controllers. The gateway contains all the necessary software and hardware to interface with the controller and output a digital signal.

2.4 Operating Precaution

Before placing the pH or ORP sensor into operation, remove the protective cap to expose the process electrode and reference junction. Save the protective cap for future use.

For short-term storage (when sensor is out of the process for more than one hour), fill the protective cap with pH 4 buffer or DI water and place the cap back on the sensor. Keeping the process electrode and reference junction moist will avoid slow response when the sensor is placed back in operation.

For extended storage, repeat the short-term storage procedure every 2 to 4 weeks, depending on the surrounding environmental conditions.

CAUTION

If the pH process electrode breaks, handle the sensor very carefully to prevent injury.

The process electrode at the pH sensor tip has a glass bulb, which can break. Do not subject this electrode to abrupt impact or other mechanical abuse.

The gold or platinum process electrode at the ORP sensor tip has a glass shank (hidden by the salt bridge) which can break. Do not subject this electrode to impact or other mechanical abuse.

9