Emerson Rosemount 389 User manual

Instruction Manual
LIQ-MAN-389, Rev G
July 2017
Rosemount™ 389/389VP
General Purpose pH/ORP Sensors

Essential instructions
Read this page before proceeding!
Emerson designs, manufactures, and tests its Rosemount 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. 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 instrument, and warranty
invalidation.
•Read all instructions prior to installing, operating, and servicing this product. If this instruction manual is not the correct
manual, call 1-855-724-2638, and we will provide the requested manual. Save this manual for future reference.
•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 manual and per applicable local and
national codes. Connect all products to the proper electrical and pressure sources.
•Install your equipment as specified in the Installation section 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 Rosemount.
Unauthorized parts and procedures can affect the product's performance and place the safe operation of your process at
risk. Look alike 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 people, to prevent electrical shock and personal injury.
WARNING!
HAZARDOUS AREA INSTALLATION
Installations near flammable liquids or in hazardous area locations must be carefully evaluated by qualified on site safety personnel.
To secure and maintain intrinsically safe installation, an approprieate transmitter/safety barrier/sensor combination must be used.
The installation system must be in accordance with the governing approval agency (FM, CSA, or BASEEFA/CENELEC) hazardous are
classification requirements. Consult your analyzer/transmitter instruction manual for details.
Proper installation, operation, and servicing of this sensor in a hazardous area installation are entirely your responsibility.
WARNING!
SENSOR/PROCESS APPLICATION COMPATIBILITY
The wetted sensor materials may not be compatible with process composition and operating conditions. Application compatibility is
entirely your responsibility.
CAUTION!
If a 275, 375, or 475 Universal HART Communicator is used with these transmitters, the software within the 275, 375, or 475 may
require modification. If a software modification is required, please contact your local Rosemount Service group or National Response
Center at 1-800-654-7768.
About this Document
This manual contains instructions for installation and operation of the Rosemount
389/389VP General Purpose pH/ORP Sensors. The following list provides notes concerning
all revisions of this document.
Rev. level Date Notes
A 2/2001 This is the intial release of the product manual. The manual has been reformatted to reflect
the Emerson documentation style and updated to reflect any changes in the product offer-
ing.

Rev. level Date Notes
B 2/2002 Added 1055 wiring diagrams.
C 10/2005 Changed PN 933022 to PN 9320057 on the drawing 400389VP12, page 5 and Table 5-2,
page 17.
D 12/2008 Updated to add VP.
E 03/2012 Updated pages 23 and 26.
F 1/2013 Incorporated SMART Sensor technology.
G 4/2017 Updated wiring diagrams. Reformatted to reflect new Emerson branding guidelines.

Contents
Chapter 1 Description and specifications ..........................................................................................1
1.1 Features and applications ...............................................................................................................1
1.2 Specifications .................................................................................................................................2
1.3 Certifications ..................................................................................................................................3
1.4 Ordering Information ..................................................................................................................... 4
Chapter 2 Installation .......................................................................................................................7
2.1 Unpacking and Inspection .............................................................................................................. 7
2.2 Mounting ....................................................................................................................................... 7
2.2.1 Submersion mounting .....................................................................................................9
2.2.2 Flow Through and Insertion Mounting ........................................................................... 11
2.3 Electrical Installation .................................................................................................................... 11
Chapter 3 Calibration and maintenance .........................................................................................23
3.1 Sensor Preparation .......................................................................................................................23
3.2 Rosemount 389/389VP pH Calibration .........................................................................................23
3.2.1 Recommended Two Point Buffer Calibration Procedure ................................................ 23
3.2.2 Recommended pH Sensor Standardization ....................................................................24
3.3 Rosemount 389/389VP ORP Calibration .......................................................................................24
3.3.1 Calibration .....................................................................................................................24
Chapter 4 Maintenance .................................................................................................................. 27
4.1 Electrode Cleaning ....................................................................................................................... 27
4.2 Automatic Temperature Compensator ........................................................................................ 27
4.3 ORP ..............................................................................................................................................28
4.3.1 Platinum Electrode Check ..............................................................................................28
4.3.2 Cleaning Platinum Electrode ..........................................................................................29
Chapter 5 Troubleshooting ............................................................................................................ 31
Chapter 6 Return of Material .......................................................................................................... 33
Chapter 7 EC Declaration of Conformity ......................................................................................... 35
Chapter 8 Intrinsically Safe Sensor Installation Drawing - FM .......................................................... 37
Contents
Instruction Manual i

Contents
ii 389/389VP

1 Description and specifications
1.1 Features and applications
Rosemount 389VP triple-junction sensors are offered with SMART capabilities. SMART
options are enabled when used with Rosemount 1056, 1057, 1066, and 56 transmitters.
The pH-loop capabilities include auto-recognition of the SMART sensor, automatic upload
of calibration data and associated time stamp, and historical recording of pH diagnostics
(slope, offset, reference impedance, and glass impedance). This trending data allows
technicians to predict frequency of maintenance and estimate sensor life for a particular
process condition. Additional SMART features include factory calibration, resetting SMART
sensor calibration data with user menus without power cycling, and manufacturing
information.
The reference junction aids in the sensor's resistance to poisoning ions and helps prolong
sensor life. Rosemount 389/389VP sensors have a triple junction reference, which protects
the reference element from poisoning ions - such as ammonia, chlorine, cyanides, and
sulfides - in the process. Both models are made with anouter ceramic junction constructed
in an annualr design around the pH/ORP sensitive membrane.
The AccuGLASS™ pH glass formulations exceed industry standards. The AccuGlass pH glass
is a result of many years of glass research resulting in a formulation which has been found
to increase the life of the sensor. Unlike other pH glasses presently on the market, this
glass resists cracking, especially at higher temperatures, and reduces sodium ion errors
commonly found in high pH applications. Overall, the AccuGlass formulation enhances the
sensor performance to measure pH more accurately and have a longer sensor life than
ever before.
A choice of pH glass electrodes is available to best meet various application needs. Two
types are available: general purpose and high pH glass. The AccuGlass hemi bulb is the
standard glass offered on both types and can be used for most applications.
The Rosemount 389VP is configured with a Variopol (VP8) sensor-to-cable connector
which eliminates re-wiring and cable twisting when replacing sensors. The Variopol VP8
multiple pin connector option uses a mating VP cable. Once the cable is installed and wired
to the transmitter, sensors are easily replaced without replacing the cable and without
rewiring the transmitter. Also, the cable can be disconnected from the sensor before
removal from the process which eliminates cable twisting. VP8 cable assemblies work with
both VP8 and VP6 sensor connectors.
The Rosemount 389/389VP has a molded Tefzel body with Viton O-rings, making each
sensor very robust and chemically resistant. Complete encapsulation eliminates leakage or
high humidity problems traditionally found in other pH/ORP designs. The seimplified
construction, designed with user convenience in mind, does not require electrolyte (KCl)
replenishment or any high maintenance troubleshooting procedures.
Description and specifications
Instruction Manual 1

Rosemount 389/389VP sensors are combintation sensors (pH, reference, and temperature
within sensor body) and measure pH or ORP (oxidation/reduction potential) of aqueous
solutions in pipelines, open tanks, or ponds. rosemount 389/389VP sensors are suitable for
virtually all applications and are compatible with Rosemount and other manufacturers'
instruments.
Installation is easily achieved through the wide variety of mounting configurations. These
sensors feature a 1 inch (MNPT) front and rear facing connections for insertion,
submersion, or flow-through pH and ORP applications.
1.2 Specifications
Percent linearity over pH rangeTable 1-1:
pH range GPLR glass (-10) High pH glass (-11)
0 to 2 pH 94% 94%
2 to 12 pH 99% 97%
12 to 13 pH 97% 98%
13 to 14 pH 92% 98%
Rosemount 389/389VP pH/ORP sensor specificationsTable 1-2:
Measurement range
pH 0 to 14
ORP -1500 to +1500 mV
Temperature range
32 to 185 °F (0 to 85 °C)
Automatic temperature compensation : 32 to 185 °F (0 to 85 °C)
Maximum pressure
100 psig (790 kPa[abs]) at 150 °F (65 °C) - see Figure 1-1
Materials of construction
Sensor body Tefzel
pH electrode Glass
ORP electrode Platinum
Junction Ceramic
O-ring Viton
Process connections
Front facing 1 in. MNPT
Rear facing 1 in. MNPT
Description and specifications
2389/389VP

Rosemount 389/389VP pH/ORP sensor specifications (continued)Table 1-2:
Cable
389 Integral preamplifier - 25 ft (7.8 m); no preamplifier - 15 ft
(4.6 m)
389VP Use 24281-XX, 2.5 ft (0.8 m) to 100 ft (31 m) (see Accesso-
ries)
Weight/shipping weight
1 lb / 2 lb (0.45 kg / 0.9 kg)
Pressure/temperature operating range for Rosemount 389/389VPFigure 1-1:
1.3 Certifications
IECEx
Sensors without preamp (pH and ORP) -Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +60 ºC)
Sensors with SMART preamp (pH only) - Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +60 ºC)
Sensors with standard preamp (ORP only) - Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +80 ºC) or Ex IIC T5
Ga (-20 ºC ≤ Ta ≤ +40 ºC)
Per standards IEC60079-0: 2011, IEC 60079-11: 2011
ATEX
Sensors without preamp (pH and ORP)- II 1 G Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +60 ºC)
Description and specifications
Instruction Manual 3

Sensors with SMART preamp (pH only) - II 1 G Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +60 ºC)
Sensors with standard preamp (ORP only) - II 1 G Ex ia IIC T4 Ga (-20 ºC ≤ Ta ≤ +80 ºC) or II 1
G Ex ia IIC T5 Ga (-20 ºC ≤ Ta ≤ +40 ºC)
Per standards EN 60079-0:2012 + A11:2013, EN 60079-11:2012
FM
See online FM Certificate of Compliance for applicable sensor options:
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 Ta =
-20 °C to + 60 °C Hazardous (Classified) Locations
IS/I, II, III/1/ABCDEFG/T6 Ta = 60 °C - 140332; Entity: I/0/AEX ia IIC/T6 Ta =60 °C - 1400332;
Entity; NI/I/2/ABCD/T6 Ta = 60 °C; S/I, III/2/EFG/T6 Ta = 60 °C; Entity Parameters
Per standards 3600: 1998; 3610: 2010, 3611:2004, 3810:2005
CSA
See online CSA Certificate of Compliance for applicable sensor options:
Intrinsically Safe: Class I, Division 1, Groups ABCD; Class II, Division 1, Groups EFG; Class III,
Class I, Division II, Groups ABCD; Ambient temperature rating -20 °C to + 60 °C; Ex ia IIC; T6
Intrinsically Safe and Non-Incendive: Class I, Division 1, Groups ABCD; Class II, Division 1,
Groups EFG; Class III; Class 1, Division 2, Groups ABCD; Ex ia IIC; T6; Ambient temperature
rating -20 °C to + 60 °C: (Simple Apparatus)
Per standards C22.2 No. 144 -M1987, C22.2 No 157 - M1992, CAN/CSA E60079:0:07,
CAN/CSA E60079:11:02, UL 50, UL 508, UL 913, UL 60079-0:2005, UL 60079-11: 2002
1.4 Ordering Information
The Rosemount 389 and 389VP General Purpose pH/ORP Sensors are housed in a molded
Tefzel body with 1 in. MNPT forward and rear facing threads suitable for insertion,
submersion, or flow through installation. The sensors can be configured with a general
purpose pH, high pH, or platinum ORP electrode. Rosemount 389VP sensors are offered
with SMART preamplifiers for pH measurements and standard integral preamplifiers for
ORP measurements. These sensors may be configured without a preamplifier, but must be
used with a remote preamplifier (j-box or transmitter). Automatic temperature
compensation is standard. Sensors are available with either an integral cable connection
(389) or Variopol (VP6) connector (389VP). Variopol cables sold separately (see Table 5-2).
Description and specifications
4389/389VP

Rosemount 389 pH/ORP Sensor ordering informationTable 1-3:
Model Sensor type
389 pH/ORP Sensor
Preamplifier/cable
01 Integral pramplifier, 25 ft cable(1)
02 No preamplifier, 15 ft cable
Combination electrode
10 pH -GPLR glass
11 pH-high pH glass
12 ORP
Transmitter/TC compatibility
50 1181, 1050, 1060 (code -01 or -02)
54 1054A/B, 81, 2081, (code -01 or -02); for 54, 56, 1055, 1056, 1057, 1066, 5081, 6081, and XMT
(code -02 only)
55 54, 56, 1055, 1056, 1057, 5081, 6081, and XMT (code -01 only)
Optional
- No selection
62 Cable without BNC for models: 54, 56, 1055, 1056, 1057, 1066, 5081, 6081, and XMT (codes -02 and
-54 only)
Typical model number: 389-02-10-54-62
(1) Preamplifier is SMART if selected with pH electrode and option 55 only. Preamplifier is standard for ORP electrodes and for options 50
and 54.
Description and specifications
Instruction Manual 5

Rosemount 389VP pH/ORP Sensor ordering informationTable 1-4:
Model Sensor type
389VP pH/ORP sensor
Combination electrode
10 pH - GPLR glass
11 pH - high pH glass
12 ORP
Transmitter/TC compatiblity
50 1181, 1050, 1060 (code -01 or -02)
54 1054A/B, 81, 2081 (code -01 or -02); for 54, 56, 1055, 1056, 1057, 1066, 5081, 6081, and XMT
(code -02 only)
55 54, 56, 1055, 1056, 1057, 5081, 6081, and XMT (code -01 only)
Preamplifier option
- No preamplifier
70 SMART preamplifier(1)
Typical model number: 389VP-10-55-70
(1) Only available with -10, -11, and -55 options.
Description and specifications
6389/389VP

2 Installation
2.1 Unpacking and Inspection
1. Inspect the outside of the carton for any damage.
2. If damage is detected, contact the carrier immediately.
3. Inspect the hardware.
4. Make sure all the items in the packing list are present and in good condition.
5. Notify the factory if any part is missing.
2.2 Mounting
The sensor has been designed to be located in industrial process environments.
Temperature and pressure limitations must not be exceeded at any time. A Caution label
regarding this matter is attached to the sensor with the cable. Please do not remove this
label..
Rosemount 389 Sensor dimensional drawingFigure 2-1:
Installation
Instruction Manual 7

Rosemount 389VP Sensor dimensional drawingFigure 2-2:
Installation
8389/389VP

WARNING!
IRRITANT
Internal electrolyte fill may cause skin or eye irritation.
Mounting guidelines
1. Shake down the sensor to remove any air bubbles that may be present inside the tip
of the pH glass.
2. Do not install the sensor horizontally. The sensor must be 10 º off the horizontal to
ensure accuracy.
3. Do not install the sensor upside down.
4. With the standard recessed electrode, air bubbles may become trapped in the
sensor end. This problem is most commonly encountered in areas of low flow or
during calibration. Shake the probe while it is immersed in solution to remove
bubbles.
In most cases, the sensor can simply be installed as shipped, and you can obtain readings
with an accuracy of ±0.2 pH. To obtain greater accuracy or to verify proper operation, the
sensor must be calibrated as a loop with its compatible analyzer or transmitter.
2.2.1 Submersion mounting
Rosemount 389 and 389VP sensors have a 1 in. MNPT process connection at the back of
the sensor.
1. Using a standard 1 in. union, mount the sensor to a 1 in. SCH 80 CPVC or PVDF
standpipe.
2. Tapered pipe threads in plastic tend to loosen after installation. We therefore
recommend that you use Teflon tape on the threads and check the tightness of the
connection frequently to ensure that no loosening has occurred.
3. To prevent rain water or condensation from running into the sensor, use a
weatherproof junction box (see Figure 2-3).
Installation
Instruction Manual 9

Submersion installationsFigure 2-3:
4. Run the sensor cable through a protective conduit for isolation from electrical
interference or physical abuse from the process.
5. Install the sensor within 80 ° of vertical, with the electrode facing down.
Do not run the sensor's cable with power or control wiring.
Installation
10 389/389VP

2.2.2 Flow Through and Insertion Mounting
Rosemount 389 and 389VP sensors also have a 1 in. MNPT process at the front of the
sensor for mounting into a 1-1/4 in. tee or the process. See Figure for installation
configurations.
Flow Through and Insertion InstallationsFigure 2-4:
Note
Valves and fittings by others. Mount the sensor at least 10 ° from horizontal.
Note
Do not use large pipe wrenches to tighten the sensor into a flange or other type of mounting.
2.3 Electrical Installation
Figure 2-5 through Figure 2-19 provide the guidelines for wiring Rosemount 389/389VP
sensors to various Rosemount transmitters.
1. If the cable needs to be extended, use a high quality four conductor shielded
instrument cable available from Rosemount.
Note
If the cable is too long, loop up the excess cable. If the cable has to be shortened, splice and
terminate each conductor neatly and make sure that the overall (outermost) drain wire is not
shorted out with either of the two inner drain wires (shields).
2. Signal cable should be run in a dedicated conduit (preferably an earth grounded
metallic conduit) and should be kept away from AC power lines. For your
convenience, a spade lug kit is furnished (in a plastic bag wrapped around the cable).
Installation
Instruction Manual 11

Model 389 with Insertion Mounting Adapter P/N 23242-02Figure 2-5:
VP 8 Cable, Rosemount 389VP Sensor EndFigure 2-6:
Installation
12 389/389VP

VP8 Cable, Instrument EndFigure 2-7:
NOTICE
For additional wiring information on this product, including sensor combinations not shown
here, please refer to the Liquid Transmitter Wiring Diagrams.
Installation
Instruction Manual 13

Rosemount 389-01-xx-55 Wiring to Rosemount 1056, 1057, and 56
Transmitters
Figure 2-8:
Installation
14 389/389VP