Name: Hach sc200
Brand: Hach
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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 to

interface with the controller and output a digital signal. Extension cables are required for

connection from the digital gateway to the digital controller. See Replacement Parts and

Accessories on page 41.

2.4 Operating Precaution

CAUTION

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

prevent injury.

Before placing the pH or ORP sensor into operation, remove the protective cap to expose

the process electrode and salt bridge. 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 salt bridge 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. See Specifications on page 5 for

temperature storage limits.

The process electrode at the tip of the pH sensor has a glass bulb, which can be broken.

Do not subject it 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.

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