Emerson Rosemount 385, Reference Manual, Page: 11 / 34

Installation 5
Section 2: Installation
Reference Manual Installation
00809-0100-3385 February 2019
2.1 Unpacking and Inspection
Inspect the outside of the carton for any damage. If damage is detected, contact the carrier
immediately. Inspect the instrument and hardware. Make sure all items in the packing list are
present and in good condition. Notify the factory if any part is missing.
The Rosemount 385 is shipped in two parts. The measuring electrode and sensor housing with
junction box and the preamplifier (or 15 ft coaxial cable for use with a remote preamplifier).
The 1-1/2 in. ball valve, 1 x 1-1/2 in. reducing coupling and 1-1/2 in. close nipple are available as an
option (P/N 23240-00 in 316 stainless steel or P/N 23240-01 in carbon steel).
2.2 Mechanical Installation
The Rosemount 385 Sensor may be installed through a 1-1/2 in. weldalet or in a pipe tee or “Y”,
as shown in Figure 2-1, when used with a ball valve. Insert the end of the sensor to a depth suffi
cient to ensure that the glass bulb is continuously wetted by the process fluid. The Model 385
can also be inserted directly into process without a ball valve using its 1 in. MNPT process fitting
(Figure 2-2). Allow sufficient room for the safe maintenance of the sensor. per sonnel should
have room for stable footing during retrac tion and re-inser tion of the sensor. The sensor must
be mounted within 80 degrees of vertical with the tip pointed downward, thus keeping air
bubbles out of the pH sensitive glass bulb. Bubbles settled in the glass bulb disrupt the electrical
continuity between the pH sensitive glass and the silver/silver chloride measuring element.
2.2.1 Installing the Sensor
1. If the sensor is inserted directly into the process without a ball valve, go to Step 2. Carefully
remove the rubber boot which protects the glass electrode and keeps the liquid junction
wet. Make sure the lubricated O-ring is in place in the groove inside the male connector
body (A). With the male connector on the sensor, screw the male connector body (A) into
the process ball valve. Insert the sensor into the ball valve assembly until it gently contacts
the closed valve. (The molded electrode guard will protect the glass bulb from breakage.)
2. Thread the male connector body tightly into the ball valve assembly or process
connection. DO NOT tighten the hex nut on the male connector body; this would crimp the
ferrule on the sensor tube prematurely.
3. Pull back hard on the sensor assembly, as if trying to remove the sensor, to be certain that
the sensor cannot come free from the valve assembly and the male connector. The built-
in retraction stop collar at the end of the sensor will butt against the shoulder of the male
connector.
WARNING
Glass electrode must be wetted at all times (in storage and in line) to maximize sensor life.
Save the original packing cartons and materials as most carriers require proof of damage due to mishandling,
etc. Also, if it is necessary to return the instrument to the factory, you must pack the instrument in the same
manner as it was received. Refer to Section 6.0 for instructions.
NOTICE