Emerson Rosemount 389 Manuale utente

Quick Start Guide

00825-0200-3389, Rev AA

May2023

Rosemount™ pH/ORP Sensors

Models 389, 389VP, 396, 396VP, 397,

398, 398VP, 398R, 398RVP

Contents

Essential instructions...................................................................................................................3

Installation.................................................................................................................................... 5

Wiring.......................................................................................................................................... 18

Calibration and maintenance................................................................................................... 25

Rosemount pH/ORP sensor(s) product certifications............................................................30

Quick Start Guide May2023

2 Rosemount pH/ORP Sensors

1 Essential instructions

Read this page before proceeding!

Emerson designs, manufactures, and tests its products to meet many

national and international standards. Because these instruments

are sophisticated technical products, you must properly install, use,

and maintain them to ensure they continue to operate within their

normal specifications. You must adhere to the following instructions

and integrate them into your safety program when installing, using,

and maintaining Emerson's Rosemount products.

WARNING

Failure to follow the proper instructions may cause any one of the

following situations to occur: loss of life, personal injury, property

damage, damage to this instrument, and warranty invalidation.

Read all instructions prior to installing, operating, and servicing

the product.

Follow all warnings, cautions, and instructions marked on and

supplied with the product.

If this Quick Start Guide is not the correct one, call 1-800-854-8257

or 949-757-8500 to request the correct Quick Start Guide. Save

this Quick Start Guide for future reference.

Inform and educate your personnel in the proper installation,

operation, and maintenance of the product.

Use only qualified personnel to install, operate, program, and

maintain the product.

Install equipment as specified in the installation instructions of

the appropriate Quick Start Guide and per applicable local and

national codes. Connect all products to the proper electrical and

pressure sources.

When replacement parts are required, ensure that qualified

people use replacement parts specified by Emerson.

Ensure that all equipment doors are closed and protective covers

are in place, except when maintenance is being performed by

qualified people, to prevent electrical shock and personal injury.

NOTICE

The information contained in this document is subject to change

without notice.

May2023 Quick Start Guide

Quick Start Guide 3

WARNING

Physical access

Unauthorized personnel may potentially cause significant damage to

and/or misconfiguration of end users’ equipment. This could be

intentional or unintentional and needs to be protected against.

Physical security is an important part of any security program and

fundamental to protecting your system. Restrict physical access by

unauthorized personnel to protect end users' assets. This is true for

all systems used within the facility.

CAUTION

Special conditions for safe use

All pH/ORP sensors have a plastic enclosure which must be cleaned

with a damp cloth to avoid the danger due to a buildup of

electrostatic discharge.

NOTICE

Sensor/process application compatibility

The wetted sensor material may not be compatible with process

composition and operating conditions.

Application compatibility is entirely the owner's responsibility.

Quick Start Guide May2023

4 Rosemount pH/ORP Sensors

2 Installation

2.1 Storing the sensor

•Emerson recommends storing pH/ORP sensors in their original

shipping containers until needed.

•Store sensors in a temperature-controlled environment.

•If the sensor must be stored after it has been removed from

its shipping container, store the sensor tip downward with the

protective cap in place and containing KCL solution (PN 9210342).

•For overnight storage, immerse the sensor in tap water or a 4 pH

buffer solution.

•pH glass electrodes slowly deteriorate in storage. There is no

specific expiration date. Follow the calibration procedures in

Calibration and maintenance to determine if the sensor calibrates

properly.

2.2 Prepare sensor

Procedure

1. Remove sensor from shipping container

2. Remove the protective cap covering the electrode bulb.

3. Rinse away salt film with clean water; then shake the electrode

so that the internal solution fills the bulb, removing any air

trapped there.

2.3 Installing sensors

2.3.1 Installation accessories

See the Liquid Analysis Sensor Mounting, Wiring, and Calibration

Product Data Sheet for a full list of accessories available from

Emerson to enable convenient and reliable sensor installation for

your application.

May2023 Quick Start Guide

Quick Start Guide 5

2.3.2 Sensor orientation

Install all Rosemount pH/ORP sensors within 80 degrees of vertical,

as shown in Figure 2-1. This ensures that the air bubble within the

sensor does not stay at the sensor tip and disrupt the measurement.

Figure 2-1: Sensor orientation

Install the sensor tip down within 80 degrees of vertical.

2.3.3 Install insertion style sensors

Emerson offers two primary mounting styles for pH/ORP sensors:

insertion and retractable.

Insertion style sensors have NPT pipe threads that you can connect

directly into the process or into a mounting adapter.

Figure 2-2: Example of a Rosemount insertion style sensor

A. Forward facing ¾-in. NPT are present on some Rosemount pH/ORP

sensor models.

B. Forward facing 1-in. NPT

C. Wrench flats

D. Rear facing 1-in. NPT

You can connect insertion style sensors to the process using the

forward facing NPT threads or you can use the rear facing NPT

threads for immersion mounting in a pond or basin.

Quick Start Guide May2023

6 Rosemount pH/ORP Sensors

For immersion mounting, connect the sensor to a pipe using the rear

facing threads to keep the cable connection on the back of the sensor

dry.

Procedure

1. When using the sensor's NPT threads to connect to your

process, wrap the sensor threads with six or seven turns of

PTFE tape to prevent leakage.

2. Hand tighten the sensor and then tighten one or two turns

with a wrench.

Do not over tighten.

2.3.4 Installing retractable style sensors

Emerson offers two primary mounting style designs for pH/ORP

sensors: insertion and retractable.

Retractable style sensors have 1-in. (25 mm) outer diameter metal

bodies that you must connect to the process using an Emerson

provided insertion adapter or a ball valve retraction mounting

assembly.

Figure 2-3: Example of Rosemount retractable style sensor

A. 1-in. (25 mm) outer diameter retractable sensor body

Retractable sensors are available in several different lengths.

Retractable sensors with a length of less than 15 in. (381 mm) require

the use of an insertion adapter (PN 23166-00, PN 23166-01, or PN

9510066).

You can install retractable sensors with lengths greater than 15 in.

(381 mm) with an insertion adapter or with a Rosemount ball valve

assembly (PN 23240-00 or PN 23765-00). Ball valve assemblies allow

the sensor to be isolated from the process, so that you can remove

the sensor for cleaning, service, or replacement while the process

remains on-line.

May2023 Quick Start Guide

Quick Start Guide 7

Install retractable sensor with an insertion adapter

Figure 2-4: Insertion adapter (PN 23166-00 or PN 23166-01) with

Rosemount retractable sensor

A. 1-in. NPT

B. Ferrule fitting process connector assembly: PN 23166-00 or PN

23166-01

C. Sensor body

Procedure

1. Slide the fitting onto the sensor from the back of the sensor.

Install the threads facing forward for insertion installations.

Install the threads facing backward for connection to a

submersion pipe.

2. Connect the NPT threads on the adapter to the process piping

or submersion pipe.

3. Adjust the position of the fitting on the sensor to achieve the

desired sensor insertion length.

4. While holding the sensor in position, tighten the hex nut of the

male connector to firmly secure the sensor in place.

NOTICE

Over-tightening the hex nut may damage the ferrule.

When you tighten the hex nut, the PTFE ferrule inside the

compression fitting clamps the sensor tube.

Quick Start Guide May2023

8 Rosemount pH/ORP Sensors

Install retractable sensor with ball valve assembly PN

23240-00

Figure 2-5: PN 23240-00 ball valve assembly and PN 23166-00 or

PN 23166-01 adapter with Rosemount retractable sensor

Dimension in drawing shows millimeters above and inches below.

A. Dimension (see Table 2-1)

B. Dimension (see Table 2-1)

C. Process connector (PN 23166-00 or PN 23166-01). Not included

with ball valve kit.

D. 1.5-in. (38.1 mm) by 1-in. (25.4 mm) reducer (PN 9310104)

E. Ball valve (PN 934065)

F. Ball valve kit (PN 23240-00)

G. 1.5-in. (38.1 mm) close nipple (PN 931012)

Table 2-1: Insertion lengths for retraction assembly PN 23240-00

Sensor tube length A B (maximum)

21 in. (533 mm) 23.1 in. (587 mm) 12.9 in. (328 mm)

36 in. (914 mm) 37.58 in. (955 mm) 27.4 in. (696 mm)

May2023 Quick Start Guide

Quick Start Guide 9

Figure 2-6: Exploded view ball valve assembly (PN 23240-00) used

with process connector (PN 23166-00 or PN 23166-01)

A. Kit, 1-in. (25.4 mm) ferrule fitting (PN 23166-00)

B. 1.5-in. (38.1 mm) by 1-in. (25.4 mm) reducer (PN 9310104)

C. 1.5-in. (38.1 mm) close nipple, 316 stainless steel (PN 9310103)

D. 1.5-in. (38.1 mm) ball valve, 316 stainless steel (PN 9340065)

E. Sensor

Procedure

1. Securely connect the ball valve assembly (ball valve, nipple,

and reducer) to the process.

2. Make sure the ball valve is closed and the system pressure is

at or below the maximum rated retraction pressure for the

sensor length you are using before proceeding.

WARNING

Before removing the sensor, be absolutely certain that the

process pressure is reduced to 0 psig (0 barg) and the

process temperature is lowered to a safe level.

Do not insert or retract retractable sensors when process

pressure is above the specified retraction pressure limit for

the length of sensor being used.

For 21-in. (533 mm) length sensors the maximum allowed

retraction pressure is 64 psig (5.4 barg).

For 36-in. (914 mm) length sensors the maximum allowed

retraction pressure is 35 psig (3.4 barg).

3. Slide the ferrule fitting (PN 23166-00 or 23166-01) onto the

sensor from the back of the sensor.

4. With the ferrule fitting on the sensor's body, insert the sensor

into the ball valve until it gently touches the closed valve.

Quick Start Guide May2023

10 Rosemount pH/ORP Sensors

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