Emerson Rosemount 328A Reference Manual

Rosemount™ 328A

pH Sensors

Reference Manual

0809-0100-3328

0

Rev. AA

February 2019

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Essential Instructions

Read this page before proceeding!

merson designs, manufactures and tests its products to meet many national and international stan-

E
dards. Because these sensors are sophisticated technical products, you MUST properly install, use,
and maintain them to ensure they continue to operate within their normal specifications. The
following instructions MUST be adhered to and integrated into your safety program when installing,
using, and maintaining Rosemount products. 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
sensor; and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing the product.

• If you do not understand any of the instructions, contact your Emerson representative for

clarification.

• Follow all warnings, cautions, and instructions marked on and supplied with the product.

• Inform and educate your personnel in the proper installation, operation, and maintenance

of the product.

• Install your equipment as specified in the Installation Instructions of the appropriate

Reference Manual and per applicable local and national codes. Connect all products to
the proper electrical and pressure sources.

• To ensure proper performance, use qualified personnel to install, operate, update,

program, and maintain the product.

• When replacement parts are required, ensure that qualified people use replacement parts

specified by Emerson. Unauthorized parts and procedures can affect the product's
performance, place the safe operation of your process at risk, and VOID YOUR WARRANTY.
`Third-party substitutions may result in fire, electrical hazards, or improper operation.

• Ensure that all equipment doors are closed and protective covers are in place, except when

maintenance is being performed by qualified persons, to prevent electrical shock and
personal injury.

The information contained in this document is subject to change without notice.

CAUTION

Sensor/Process Application Compatibility

The wetted sensor materials may not be compatible with process composition and operating
conditions. Application compatibility is entirely the responsibility of the user.

CAUTION

Special Conditions for Safe Use

1. All pH sensors have a plastic enclosure which must only be cleaned with a damp cloth to avoid the danger
due to a build up of an electrostatic charge.

2. All pH sensor models are intended to be in contact with the process fluid and may not meet the 500V
r.m.s. a.c. test to earth.

This must be taken into consideration at installation.

Reference Manual Table of Contents

00809-0100-3328 February 2019

Contents

Section 1: Specifications

1.1 Specifications ......................................................................................................1

1.2 Product Certifications..........................................................................................2

Section 2: Installation

2.1 Unpacking and Inspection ...................................................................................3

2.2 Storage................................................................................................................3

2.3 Electrode Preparation ..........................................................................................3

2.4 Installation Procedure (With Holder Assembly)....................................................4

Section 3: Wiring

3.1 Wiring for Rosemount 328A.................................................................................7

Section 4: Maintenance

4.1 Maintenance......................................................................................................11

EC Declaration of Conformity ...............................................................................13

Intrinsically Safe Sensor Installation Drawing - FM.....................................15

Table of Contents i

Table of Contents Reference Manual

February 2019 00809-0100-3328

ii Table of Contents

Reference Manual Specifications

00809-0100-3328 February 2019

Section 1: Specifications

1.1 Specifications

Table 1-1: Rosemount 328A sensor specifications

Process Connections

Standard 12 mm insertion hardware (see Dimensional Drawing)

Sensitivity

± 0.02pH

Temperature/Pressure Rating

446 kPa abs at 130°C (50 psig at 266°F)

584 kPa abs at 80°C (70 psig at 176°F)

791 kPa abs at 40°C (100 psig at 104°F)

Cable

2-conductor, low-noise coax, 15 ft (4.5 m)

Weight/Shipping Weight

100 gms/180 gms (.2 lb/1.0 lb)

Performance

In typical applications, the sensor will perform continuously for 50 steam sterilization cycles.

pH Range

0-13 pH _

1.67-4.01 pH 96% linearity

4.01-12.0 99% linearity

12.0-13.0 pH 97% linearity

Repeatability

± 0.05 pH

Automatic Temperature Compensation

Temperature compensation is generally not required since most applications operate very near pH 7 (isopotential point).
When temperature compensation is required a separate RTD can be used with compatible instruments.

Wetted Materials

Ceramic, silicone and glass

Recommended Accessories

PN 22924-00 25mm Insertion Mounting Adapter Kit

Specifications 1

Specifications Reference Manual

February 2019 00809-0100-3328

1.2 Product Certifications

Please see online certificates for further details.
IECEx

Ex ia IIC T4 Ga (-20 °C ≤ Ta ≤ +60 °C)

Per standards IEC60079-0 : 2011, IEC 60079-11 : 2011

ATEX

II 1 G Ex ia IIC T4 Ga (-20˚C ≤ Ta ≤ +60 °C)

Per standards EN 60079-0: 2012+A11:2013, EN 60079-11:2012

FM

Intrinsically Safe for use in Class I, II, and III, Division 1, Groups A, B, C, D, E, F, and G; Temperature
Class T6 Ta = -20 °C to +60 °C

Intrinsically Safe for use in Class I, Zone 0, AEx ia IIC T6 Ta = -20 °C to +60 °C

Nonincendive for use in Class I, Division 2, Groups A, B, C, and D; Temperature Class T6 Ta = -20 °C
to +60 °C

Suitable for use in Class II and III, Division 2, Groups E, F, and G; Temperature Class T6 Ta = -20 °C
to +60 °C Hazardous (Classified) Locations

IS/I,II,III/1/ABCDEFG/T6 Ta = 60°C - 1400332; Entity; I/0/AEx ia IIC/T6 Ta = 60°C - 1400332; Entity;
NI/I/2/ABCD/T6 Ta = 60°C; S/II,III/2/EFG/T6 Ta = 60°C

Per standards 3600:1998, 3610:2010, 3611:2004, 3810:2005

CSA

Intrinsically Safe and Non-Incendive:

Class I, Division 1, Groups ABCD; Class II, Division 1, Groups EFG; Class III; Class I, Division 2, Groups
ABCD; Ex ia IIC; T6; Ambient temperature rating -20°C to +60°C: (Simple Apparatus)

Per standards C22.2 No. 142 – M1987, C22.2 No 157 – M1992, CAN/CSA E60079-0:07,
CAN/CSA E60079-11:02, UL 50:11th Ed., UL 508:17th Ed., UL 913: 7th Ed., UL 60079-0: 2005,
UL 60079-11: 2002

2 Specifications