Rosemount™ 328A
pH Sensors
Reference Manual
0809-0100-3328
0
Rev. AA
February 2019
hasgkas
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
Reference Manual Installation
00809-0100-3328 February 2019
Section 2: Installation
2.1 Unpacking and Inspection
Inspect the outside of the carton for any damage. If damage is detected, contact the carrier
immediately. Inspect 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.
CAUTION
Sensor requires sterilization prior to use.
Installation 3
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. Insert 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. Install 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
4 Installation
Reference Manual Installation
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Figure 2-2: Dimensional Drawing for Rosemount 328A and Optional Mounting Adapter Hardware Kit (PN 22924-00)
Installation 5
Installation Reference Manual
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6 Installation
Reference Manual Wiring
00809-0100-3328 February 2019
Section 3: Wiring
3.1 Wiring for Rosemount 328A
For other wiring diagrams not shown below, please refer to the Liquid Transmitter Wiring Diagrams.
Figure 3-1: Rosemount 328A Sensor Wiring to Rosemount 1056/56 Transmitters
Wiring 7
Wiring Reference Manual
February 2019 00809-0100-3328
Figure 3-2: Rosemount 328A Sensor Wiring to Rosemount 1057 Transmitter
8 Wiring
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 9
Wiring Reference Manual
February 2019 00809-0100-3328
10 Wiring
Reference Manual Maintenance
00809-0100-3328 February 2019
Section 4: Maintenance
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. If 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.
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.
Maintenance 11
Maintenance Reference Manual
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12 Maintenance
Reference Manual EC Declaration of Conformity
00809-0100-3328 February 2019
EC Declaration of Conformity
ote: Please see websitefor most recent Declaration.
N
EC Declaration of Conformity 13
EC Declaration of Conformity Reference Manual
February 2019 00809-0100-3328
14 EC Declaration of Conformity
Reference Manual EC Declaration of Conformity
00809-0100-3328 February 2019
EC Declaration of Conformity 15
China RoHS Table Reference Manual
February 2019 00809-0100-3328
16 China RoHS Table
ANY FM APPROVED
ASSOCIATED APPARATUS
HAVING ENTITY PARAMETERS
NO
N-
H
AZARDOUS
(UNCLASSIFIED)
AREA
CLASS I, II, III, DIVISION 1, GROUPS A-G
T6 Ta = 60C
SENSOR
ENTITY PARAMETERS
Ui = 13.1U, Ii = 358mA
Pi = 698 m W
Ci = 0.967 F, Li = 0.1mH
1. NO REVISION TO THIS DRAW ING IS PERM ITTED W ITHO UT
FM APPROVAL.
2. U
m ax
> U
t
; I
m ax
> I
t
; (C
i
OF ALL LOO PS + C CABLE) < C
a
;
(L
i
OF ALL LOOPS + L CABLE) < L
a
, P
m ax
OR P
i
> P
0.
3. SINGLE M ULTI-CHANNEL
IS BARRIER OR APPARATUS M UST BE FM APPROVED,
4. SINGLE M ULTI-CHANNEL
IS BARRIER OR APPARATUS M ANUFACTURE’S
CONTROL DRAW INGS M UST BE FOLLOW ED W HEN INSTALLING THE SYSTEM .
IS BARRIER OR EQUIPM ENT M AY BE INSTALLED W ITHIN THE HAZARDOUS
(CLASSIFIED) LOCATIO N FOR W HICH IT IS APPROVED
.
5. INSTALLATIO N M UST BE IN ACCORDANCE W ITH ARTICL
E 500 OF THE NEC
(ANSI/NFPA 70) AND ANSI/ISA RP 12.6.
W ARNING: SUBSTITUTIO N O F COMPONENTS M AY IM PA
IR INTRINSIC SAFETY.
6. pH & AM PEROM ETRIC SENSORS W ITHO UT PREAM PS ARE SIM PLE APPARATUS.
ZON E
ZONE 0
7. CONTROL EQUIPM ENT CONNECTED TO THE ASSO CIATED APPARATUS M UST
NOT USE OR GENERATE M O RE THAN 250V.
RESISTANCE BETW EEN INTRINSICALLY SAFE GROUND AND EARTH GROUND
M UST BE LESS THAN OR EQUAL TO 1 OHM .
ANY
FM APPROVED TRANSMITTER FOR
DIVISION 1 W ITH INTRINSICALLY SAFE
OUTPUT PARAMETERS. THIS
FM
APPROVED DEVICE M UST BE INSTALLED
PER ITS INSTALLATION DRAW ING.
FM
APPROVED EQUIPM ENT (M AY BE
M ULTIPLE DEVICES, NUMBER IS LIM ITED
BY REQUIREMENTS TO M EET ALL OTHER
IS REQUIREMENTS FOR THE NETWORK)
W ITH EQUIVALENT HAZARDOUS AREA
APPROVALS.
H
AZARDOUS
(CLASSI
F
IED)
AREA
INTRISICALLY SAFE
9. pH/ORP SENSOR M O DELS THAT M AY CONTAIN THE PREAM PLIFIER:
3900/VP
3500/VP
3300HT/VP
3400HT/VP
396/VP
396R/VP
396P/VP
398R/VP
399/VP
389/VP
385/385+
10. W ARNING: TO PREVENT IGNITION OF FLAM M ABLE OR COM BUSTIBLE
ATMOSPHERES, DISCONNECT POW ER BEFORE SERVIC
ING.
11. THE ENTITY CONCEPT ALLOW S INTECONNECTION OF INTRINSICALLY SAFE
APPARATUS W ITH ASSO CIATED APPARATUS W HEN THE FOLLO W ING IS TRUE:
U
i
> U
o;
I
i
> I
o;
P
i
> P
o;
C
o
> C
i
+ C CABLE; L
o
> L
i
+ L CABLE.
12. COPY REVISIONS TO 1400332 TO pH/ORP SHIPPING M ANUALS.
13 Ci INCLUDES THE CAPACITANCE OF 500 FEET OF SENSOR CABLE.
13
DW G NO.
1400332
8.
Reference Manual FM Installation
00809-0100-3328 February 2019
Intrinsically Safe Sensor Installation Drawing - FM
FM Installation 17
00809-0100-3328
Rev. AA
February 2019
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been made to ensure their accuracy, they are not to be construed as warranties or guarantees,
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