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Reference Manual
00809-0100-3385
Section 1: Description and Specifications
•
Retractable sensor can be easily removed and replaced under pressure without process
shutdown.
•
Chemically rugged Tefzel body with titanium tube provides maximum resistance and is
completely sealed to eliminate sensor leakage.
•
Long-life, tripple junction reference electrode provides longer service life in applications
where poisoning ions are present.
•
Integral preamplifier provides noise free long distance transmission of the high impedance
pH signal.
1.1
Features and Applications
The Rosemount 385 pH/ORP Sensor is designed to meet a wide variety of industrial applications.
It has been specially designed for applications where the process cannot be shut down and a sepa
rate sample stream is difficult or impossible to provide. The Model 385's body is constructed of
standard Titanium tube and Tefzel allowing the sensor to be used in especially harsh applications
such as bleach lines in paper mills.
The Rosemount 385 pH/ORP Sensor is designed for use with a standard 1-1/2 in. ball valve. This
makes it ideal for replacing or updating any manufacturer's existing retractable pH/ORP sensor
without process shut-down. Initial installations can even be accomplished without process shut-
down by hot tapping a 1-1/2 in. ball valve at the desired point of measurement.
Sensor removal is accomplished by retracting the sensor until it reaches the built-in retraction stop
collar (no cables or chains are required for retraction). The ball valve may then be closed, and the
sensor removed. The entire process is accomplished with almost no loss of process fluid and without
depressurizing the line. Once the sensor is removed from the ball valve it can easily be buffer
checked or its disposable sensor tube replaced.
The Rosemount 385 pH sensor comes standard with a triple junction gel filled reference cell. The
peripheral ceramic liquid junction around the base of the glass electrode assures maximum working
life even in solutions containing ammonia, chlorine and other poisoning ions.
The plug-in style solid state preamplifier is housed in a junction box as an integral part of the sensor.
Description and Specifications
Description and Specifications
February 2019
1
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