Emerson Rosemount 328A User manual

Rosemount™ 328A
pH Sensors
Reference Manual
00809-0100-3328
Rev. AA
February 2019

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Emerson designs, manufactures and tests its products to meet many national and international stan-
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.
• f 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.
• nform and educate your personnel in the proper installation, operation, and maintenance
of the product.
• nstall your equipment as specified in the nstallation nstructions 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 VO D 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.
Essential Instructions
Read this page before proceeding!
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.
CAUTI N
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.
Special Conditions for Safe Use
CAUTI N

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
Reference Manual Table of Contents
00809-0100-3328 February 2019
Table of Co te ts i

Table of Contents Reference Manual
February 2019 00809-0100-3328
ii Table of Co te ts

Section 1: Specifications
Specificatio s 1
Reference Manual Specifications
00809-0100-3328 February 2019
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
n 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 nsertion Mounting Adapter Kit
1.1 Specifications

2 Specificatio s
Specifications Reference Manual
February 2019 00809-0100-3328
1.2 Product Certifications
Please see online certificates for further details.
ECEx
Ex ia C T4 Ga (-20 °C ≤ Ta ≤ +60 °C)
Per standards EC60079-0 : 2011, EC 60079-11 : 2011
ATEX
1 G Ex ia C T4 Ga (-20˚C ≤ Ta ≤ +60 °C)
Per standards EN 60079-0: 2012+A11:2013, EN 60079-11:2012
FM
ntrinsically Safe for use in Class , , and , Division 1, Groups A, B, C, D, E, F, and G; Temperature
Class T6 Ta = -20 °C to +60 °C
ntrinsically Safe for use in Class , Zone 0, AEx ia C T6 Ta = -20 °C to +60 °C
Nonincendive for use in Class , Division 2, Groups A, B, C, and D; Temperature Class T6 Ta = -20 °C
to +60 °C
Suitable for use in Class and , Division 2, Groups E, F, and G; Temperature Class T6 Ta = -20 °C
to +60 °C Hazardous (Classified) Locations
S/ , , /1/ABCDEFG/T6 Ta = 60°C - 1400332; Entity; /0/AEx ia C/T6 Ta = 60°C - 1400332; Entity;
N / /2/ABCD/T6 Ta = 60°C; S/ , /2/EFG/T6 Ta = 60°C
Per standards 3600:1998, 3610:2010, 3611:2004, 3810:2005
CSA
ntrinsically Safe and Non- ncendive:
Class , Division 1, Groups ABCD; Class , Division 1, Groups EFG; Class ; Class , Division 2, Groups
ABCD; Ex ia C; 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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Section 2: Installation
Reference Manual Installation
00809-0100-3328 February 2019
2.1 Unpacking and Inspection
nspect the outside of the carton for any damage. f damage is detected, contact the carrier
immediately. nspect 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.
2.2 Storage
1. When not in process, immerse electrode’s measuring tip in tap water or 5% KCl Solution.
2. For extended storage fill protective boot with tap water or 5% KCl Solution and place over
electrode’s measuring tip. Store tip down.
Note: Electrode Grade 4 pH Buffer may be used in place of 5% KCl Solution.
2.3 Electrode Preparation
1. Remove electrode from shipping container.
2. Remove protective boot covering electrode’s measuring tip (pH glass membrane).
3. Wash away any salt film with clean water.
4. Shake internal solutions down to electrode’s measuring tip. Electrode is now ready for
sterilization and installation.
Sensor requires sterilization prior to use.
CAUTI N

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Installation Reference Manual
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2.4 Installation Procedure (With Holder Assembly)
Note: A preamplifier is required for all applications using a Rosemount transmitter.
1. Locate kit containing sensor O-rings, (1) O-ring, spacer and lube package.
Lube small O-rings and position, with spacer, on sensor as illustrated in Figure 2-1.
Note: Do not allow O-ring grease to come in contact with glass electrode bulb.
2. Lube (1) O-ring and install on CAP end of Holder.
3. Locate Bushing kit with wire seal and washer, (2) O-ring, and External retaining ring.
Lube (2) O-ring and form the wire seal end, work it into groove on Holder (See Figure 2-1).
4. nsert sensor, cable first, into holder from CAP end.
5. Slide the CAP over the sensor and screw tightly into place.
Note: To eliminate twisting the sensor cable, hold the CAP stationary and rotate holder. When
CAP is in place, back it off 1/2 turn and pull the electrode into place with cable. Retighten
the CAP.
6. Lube wire seal. nstall with washer according to Figure 2-1. Seal is split to facilitate
installation when sensor cable is equipped with spade lugs.
7. Slide the Bushing over cable and screw it into Holder as tightly as possible by hand.
8. Slip 1-1/4 in. Threaded Nut over cable to O-ring (2). Lock in place with External retaining
ring.
Note: Sensor does not include preamplifier.
Figure 2-1: Installation

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Reference Manual Installation
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Figure 2-2: Dimensional Drawing for Rosemount 328A and ptional Mounting Adapter Hard-
ware Kit (PN 22924-00)

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Reference Manual Wiring
00809-0100-3328 February 2019
3.1 Wiring for Rosemount 328A
For other wiring diagrams not shown below, please refer to the Liquid Transmitter Wiring Diagrams.
Section 3: Wiring
Figure 3-1: Rosemount 328A Sensor Wiring to Rosemount 1056/56 Transmitters

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Wiring Reference Manual
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Figure 3-2: Rosemount 328A Sensor Wiring to Rosemount 1057 Transmitter

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Reference Manual Wiring
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Figure 3-3: Rosemount 328A Sensor Wiring to Rosemount 1066 Transmitter
Figure 3-4: Rosemount 328A Sensor Wiring to Rosemount 5081 Transmitter

Wiring Reference Manual
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4.1 Maintenance
Performance of electrode will decrease with age and use. Sluggishness, offsets, noisiness, and
erratic reading may indicate that electrode needs cleaning and soaking.
1. To remove oil deposits, clean electrode measuring tip with mild, non-abrasive, detergent.
2. To remove scale deposits, soak electrode’s measuring tip for 20-30 minutes in 10%
hydrochloric acid.
3. Shake internal solution down to electrode’s measuring tip.
4. f electrode liquid junction appears to be clogged or dried out, soak junction portion in
80°C 5% KCl solution for one (1) hour. Leave electrode in solution while cooling.
Section 4: Maintenance
Mai te a ce 11
Reference Manual Maintenance
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WARNING
Handle sensor with care to avoid glass electrode breakage and exposure to sensor fill solution. KCl
sensor fill solution may cause skin and/or eye irritation. Flush with water for a minimum of 15 minutes
for eye exposure. Wash with soap and water for skin exposure.

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Maintenance Reference Manual
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EC Declaratio of Co formity 13
EC Declaration of Conformity
Note: Please see website for most recent Declaration.
Reference Manual EC Declaration of Conformity
00809-0100-3328 February 2019

14 EC Declaratio of Co formity
EC Declaration of Conformity Reference Manual
February 2019 00809-0100-3328