Rosemount Manual: Hx338 pH Sensor Retractable Mounting Assembly Abridged | Rosemount Manuals & Guides

Retractable Mounting Assembly

Instruction Sheet

PN 51A-RETR/rev.A
February 2004

SPECIFICATIONS

Wetted Parts: Stainless Steel (type AISI-ASTM 316 Ti; B.S.

320 S17) and Viton

1

Maximum Temperature: 130°C (266°F)
Maximum Pressure: 43 psig (400 kPa, 4 bar)

1

Viton is a registered trademark of E.I. du Pont de Nemours & Co.

NOTE

The Retractable Mounting Assembly should not be auto­claved until the cable protection cap and cap nut have been
removed.

INSTALLATION

Mounting the Sensor Into the Retractable Mounting
Assembly: The Retractable Mounting Assembly is

designed for use with Model Hx338-02, Model Hx438-02, or
any sensor with a 12-mm diameter shaft, 210 mm to 225 mm
length, and a PG 13.5 process thread.

To install the sensor into the Retractable Mounting Assembly:

1. Turn the threaded cap nut clockwise until the cable pro­tection cap can be removed.

2. Carefully screw the sensor into the Retractable Mounting
Assembly. Do not touch the sensor tip.

3. Tighten the PG 13.5 sensor thread into the assembly.

To install the cable:

1. Lead the sensor cable through the hinged opening of the
cable cap.

2. Connect the cable to the sensor.

3. Mount the cable cap back onto the mounting assembly.

4. Close the cable cap and check the central positioning of
the cable.

5. Turn the threaded cap nut counter-clockwise to attach the
cable cap.

NOTE: The cable protection cap (PN’s 9160479, 9160478,
and 9160477) must be modified for use with the VP 6.0
cable. The aperture must be enlarged to 7 mm diameter to
accommodate this cable.

Parts Locator for the Retractable Mounting Assembly

CAUTION

Contact with salt solutions and concentrated acids
may cause wetted materials to corrode.

WARNING

Be absolutely certain that the process
pressure is reduced to 0 psig and the
process temperature is lowered to a
safe level before removing or replacing
the mounting assembly or sensor.

MOUNTING THE MOUNTING ASSEMBLY INTO THE
PROCESS: The Retractable Mounting Assembly

mounts into the G 1-1/4 in. weld-in socket (PN 9160483
or similar). Make sure the weld-in socket is clean.
Tighten the stainless steel process connection nut onto
the weld-in socket.

INSERTING THE SENSOR INTO THE PROCESS: To
place the sensor into the process, press the red button
and move the extension of the Mounting Assembly until
you hear it click. Check to make sure that the assem­bly is locked. If the assembly cannot be retracted with­out pressing the red button, then the unit is locked
properly into the process. The Retractable Mounting
Assembly will remain locked until the red button releas­es the assembly for retraction.

NOTE

Do not install the Retractable Mounting
Assembly without the cable cap installed.

NOTE

The Retractable Mounting Assembly is
equipped with a safety mechanism. When a
sensor is not mounted in the assembly , the unit
cannot be moved into the measuring position.

CLEANING AND MAINTENANCE

CLEANING AND CALIBRATING THE SENSOR IN A
CONTINUOUS PROCESS

1. Press the red button and pull the Retractable
Mounting Assembly out of the process until a click
is heard. This will indicate that the safety lock has
been engaged.

2. Attach a tube for water, cleaning agent, or a cali­bration buffer to flow through the electrode chamber
via the cleaning ports. Make sure the rinsing tubes
are not under pressure before inserting the elec­trode back into the process.

NOTE

The maximum pressure of the fluid flowing
through the cleaning ports is 72 psig (600 kPa,
6 bar).

CLEANING WHEN DISMANTLED
Cleaning: The Retractable Mounting Assembly can be

cleaned with general-purpose cleaning fluids. Never
use scouring agents that contain hard particles.

Replacing the o-rings on the immersion tube: The
Retraction Service Kit (PN 9160486) should be used
when replacing the o-rings. There are 3 o-rings that
can be replaced when the unit is out of the process:

1. Mount the electrode in the assembly and place unit
into the measuring position.

2. Remove the cable protection cap

3. Unscrew both of the screws (use the hexagonal key
provided in the service kit) on either side of the
attention symbol ( ).

4. Grip the immersion tube and pull out until the third
o-ring is visible.

5. Replace the 3 o-rings on the immersion tube.

6. Make sure that the stainless steel nut and the new
o-rings are not damaged.

7. Push back the immersion tube as far as possible
until the stop and tighten up both screws with the
hexagonal key provided.

Replacing the outer o-rings: The large o-ring is used
for a watertight seal between the unit and the weld-in
socket. The smaller o-ring is used on the inner part of
the immersion tube (for the sensor). Both of these o­rings need occasional replacement.

Safety Rods: Check the functioning of the safety rod
by trying to insert or retract the Mounting Assembly
when a sensor is not mounted in the assembly. If a
sensor is not mounted, the safety rod should block the
movement. If the unit inserts without a sensor mount­ed in the unit, replace the unit.

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© Rosemount Analytical Inc. 2004