Rosemount Analytical 328A Specifications

Rosemount™ 328A

Steam Sterilizable pH sensor

Product Data Sheet

June 2017

LIQ-PDS-328A

A robust pH sensor that meets steam sterilization requirements

The Rosemount 328A pH sensors are specifically built for service in applications that require repeated steam sterilization up to 130 °C.
Sensors are suitable for use in many food, beverage, and pharmaceutical applications.

Rosemount 328A Steam Sterilizable pH sensor

Overview

June 2017

Rugged Sensor Design

 Mechanical and thermal shock resistant special pH sensitive

glass membrane for extended sensor life in high temperature
sterilizations.

 Non-flowing junction minimizes maintenance requirements

and eliminates the need for expensive pressurization
hardware.

 Extend sensor life with poisoning ion resistant double

junction reference cell.

 Ceramic body and high temperature cable permits autoclave

sterilization up to 130 °C.

Versatile Installation Options

 Designed to fit industry standard insertion hardware.

 12 mm electrode diameter allows direct replacement of most

manufacturers' steam sterilizable pH sensors.

Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

Product Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Dimensional and Installation Drawings . . . . . . . . . . . . . . 6

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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June 2017

Rosemount 328A Steam Sterilizable pH sensor

Ordering Information

The Rosemount 328A pH sensor comes with 15 ft. of integral cable and features a
ceramic sensor body, double junction reference, and gelled reference electrolyte.
Sensors require standard insertion mounting hardware for installation (PN 22924-00;
sold separately).

Table 1. Rosemount 328A pH Sensor ordering information

Model Sensor type

328A pH Sensor

Cable Termination

07 Spade Lug Connector

08 None (Undressed)

Typical Model Number: 328A-07

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Rosemount 328A Steam Sterilizable pH sensor

Specifications

Table 2. Rosemount 328A pH 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

June 2017

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

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

4

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June 2017

Rosemount 328A Steam Sterilizable pH sensor

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

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Rosemount 328A Steam Sterilizable pH sensor

Dimensional and Installation Drawings

Figure 1. Dimensional drawing of Rosemount 328A and optional mounting adapter hardware kit

(PN 22924-00)

June 2017

6

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June 2017

Rosemount 328A Steam Sterilizable pH sensor

Accessories

Table 3. Rosemount 328A pH Sensor accessories information

Part number Description

22924-00 Sensor Mounting Assembly, 25 mm Insertion

9210012 pH 4.01 Buffer Solution, 16 oz

9210013 pH 6.86 Buffer Solution, 16 oz

9210014 pH 9.18 Buffer Solution, 16 oz

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Rosemount 328A Steam Sterilizable pH sensor

LIQ-PDS-328A

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Product Data Sheet

June 2017

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Emerson Automation Solutions GmbH

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