Rosemount™ 389/389VP
General Purpose pH/ORP Sensors
Reference Manual
00809-0100-3389, Rev AA
February 2019
Essential Instructions
Read this page before proceeding!
Emerson designs, manufactures, and tests its 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 Emerson 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 the product.
• If this Reference Manual is not the correct one, call 1-800-999-9307 to request the correct Reference Manual. Save this
Reference 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 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. 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, use an appropriate transmitter/safety barrier/sensor combination. The
installation system must be in accordance with the governing approval agency (FM, CSA, or BASEEFA/CENELEC) hazardous are
classification requirements. Consult your transmitter Reference Manual for details.
Proper installation, operation, and servicing of this sensor in a hazardous area installation are entirely the operator's
responsibility.
CAUTION
Sensor/process application compatibility
The wetted sensor materials may not be compatible with process composition and operating conditions.
Application compatibility is entirely the operator's responsibility.
CAUTION
Software modifications
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.
2
Reference Manual Contents
00809-0100-3389 February 2019
Contents
Chapter 1 Description and Specifications....................................................................................... 5
1.1 Features and applications................................................................................................................. 5
1.2 Specifications................................................................................................................................... 6
1.3 Certifications....................................................................................................................................7
1.4 Ordering information....................................................................................................................... 8
Chapter 2 Install...........................................................................................................................11
2.1 Unpacking and inspection.............................................................................................................. 11
2.2 Mounting....................................................................................................................................... 11
2.3 Electrical installation.......................................................................................................................15
Chapter 3 Calibration................................................................................................................... 27
3.1 Sensor preparation......................................................................................................................... 27
3.2 pH calibration.................................................................................................................................27
3.3 Rosemount™ 389/389VP ORP calibration....................................................................................... 28
Chapter 4 Maintenance................................................................................................................31
4.1 Clean electrode.............................................................................................................................. 31
4.2 Automatic temperature compensator............................................................................................32
4.3 ORP................................................................................................................................................ 33
Chapter 5 Troubleshooting.......................................................................................................... 35
Chapter 6 Return of Material........................................................................................................37
Appendix A EC Declaration of Conformity....................................................................................... 39
Appendix B China RoHS Table......................................................................................................... 43
Appendix C Intrinsically Safe Sensor Installation Drawing - FM........................................................ 45
Reference Manual 3
Contents Reference Manual
February 2019 00809-0100-3389
4 Rosemount 389/389VP
Reference Manual Description and Specifications
00809-0100-3389 February 2019
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.
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.
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Description and Specifications Reference Manual
February 2019 00809-0100-3389
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
Table 1-1: Percent linearity over pH range
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%
Table 1-2: Rosemount 389/389VP pH/ORP sensor specifications
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
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
Accessories)
Weight/shipping weight
1 lb / 2 lb (0.45 kg / 0.9 kg)
6 Rosemount 389/389VP
Reference Manual Description and Specifications
00809-0100-3389 February 2019
Figure 1-1: Pressure/temperature operating range for Rosemount 389/389VP
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)
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
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Description and Specifications Reference Manual
February 2019 00809-0100-3389
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)
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. 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).
Table 1-3: Rosemount 389 pH/ORP Sensor ordering information
Model Sensor type
389 pH/ORP Sensor
Preamplifier/cable
01 Integral pramplifier, 25 ft cable
02 No preamplifier, 15 ft cable
(1)
Combination electrode
10 pH -GPLR glass
11 pH-high pH glass
12 ORP
8 Rosemount 389/389VP
Reference Manual Description and Specifications
00809-0100-3389 February 2019
Table 1-3: Rosemount 389 pH/ORP Sensor ordering information (continued)
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.
Table 1-4: Rosemount 389VP pH/ORP Sensor ordering information
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
Typical model number: 389VP-10-55-70
(1) Only available with -10, -11, and -55 options.
(1)
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Description and Specifications Reference Manual
February 2019 00809-0100-3389
10 Rosemount 389/389VP
Reference Manual Install
00809-0100-3389 February 2019
2 Install
2.1 Unpacking and inspection
Procedure
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 label regarding
this matter is attached to the sensor with the cable and should not be removed.
Figure 2-1: Rosemount 389 Sensor Dimensional Drawing
A. pH/ORP electrode
B. TC
C. 1-in. MNPT
D. 1-in. wrench opening
E. 1-in. MNPT
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Install
February 2019 00809-0100-3389
Figure 2-2: Rosemount 389VP Sensor Dimensional Drawing
Reference Manual
A. VP (Variopol Connection)
B. 1-in. wrench opening
C. 1-in. MNPT x 2
D. T.C.
E. pH/ORP electrode
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° 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.
12 Rosemount 389/389VP
Reference Manual Install
00809-0100-3389 February 2019
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.
Procedure
1. To prevent rain water or condensation from running into the sensor, use a
weatherproof junction box (see Figure 2-3).
2. Using a standard 1-in. union, mount the sensor to a 1-in. SCH 80 CPVC or PVDF
standpipe.
3. Tapered pipe threads in plastic tend to loosen after installation. We therefore
recommend that you use PTFE tape on the threads and check the tightness of the
connection frequently to ensure that no loosening has occurred.
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Install
February 2019 00809-0100-3389
Figure 2-3: Submersion Installations
Reference Manual
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.
2.2.2
14 Rosemount 389/389VP
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 1¼-in. tee or the process. See Figure 2-4 for installation
configurations.
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