Emerson Rosemount 3900VP, Rosemount 3900 Quick Start Guide

00825-0100-3900, Rev AA

Rosemount™ 3900/3900VP

General Purpose pH/ORP Sensors

Quick Start Guide

November 2020

Quick Start Guide November 2020

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. You
must adhere to the following instructions and integrate them into your safety program when
installing, using, and maintaining Emerson's 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 the product.

• If this Quick Start Guide is not the correct one, call 1-800-854-8257 or 949-757-8500 to request

the correct Quick Start Guide. Save this Quick Start Guide for future reference.

• 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 Quick Start Guide

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 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.

Note

The information contained in this document is subject to change without notice.

WARNING

Hazardous area installation

Installations near flammable liquids or in hazardous areas must be carefully evaluated by on site
safety personnel.

To secure and maintain intrinsically safe installation, an appropriate 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 area classification
requirements. Consult your transmitter Reference Manual for details.

Proper installation, operation, and servicing of this sensor in a hazardous area are entirely the
operator's responsibility.

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November 2020 Quick Start Guide

WARNING

Pressure and temperature

Before removing the sensor, be absolutely certain that the process pressure is reduced to 0 psig
and the process temperature is lowered to a safe level.

Do not insert or retract retractable sensors when process pressures are in excess of 64 psig (542
kPa) for option 21 or 35 psig (343 kPa) for option 25.

WARNING

Corrosive substance

The solution used during calibration is an acid; handle it with care.
Follow the directions of the acid manufacturer.
Wear the proper protective equipment.
Do not let the solution come into contact with skin or clothing.
If contact with skin is made, immediately rinse with clean water.

WARNING

Physical access

Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end
users’ equipment. This could be intentional or unintentional and needs to be protected against.

Physical security is an important part of any security program and fundamental to protecting your
system. Restrict physical access by unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.

CAUTION

Special conditions for safe use

All pH/ORP sensors have a plastic enclosure which must be cleaned with a damp cloth to avoid the
danger due to a buildup of electrostatic discharge.

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.

Contents

Install........................................................................................................................................... 5

Calibrate and maintain............................................................................................................... 22

Accessories................................................................................................................................ 25

Quick Start Guide 3

Quick Start Guide November 2020

Specifications.............................................................................................................................26

Rosemount pH/ORP sensor(s) product certifications..................................................................28

Declaration of Conformity..........................................................................................................35

China RoHS table........................................................................................................................37

Intrinsically safe sensor installation drawing - FM........................................................................38

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November 2020 Quick Start Guide

1 Install

1.1 Storage

1. Emerson recommends storing electrodes in their original shipping
containers until needed.

2. Do not store at temperatures below 14 °F (-10 °C).

3. Store electrodes with a protective cap containing KCl solution
(PN 9210342).

4. For overnight storage, immerse the sensor in tap water or 4 pH
buffer solution.

5. pH glass electrodes slowly deteriorate in storage. There is no specific
expiration date. Follow the calibration procedures in Calibrate and

maintain to determine that the sensor calibrates properly.

1.2 Prepare electrode

Procedure

1. Remove electrode from shipping container.

2. Remove the protective boot covering the electrode bulb.

3. Rinse away salt film with clean water; then shake the electrode so
that the internal solution fills the bulb, thus removing any air trapped
there.

1.3

Quick Start Guide 5

Install sensor

Procedure

1. Wrap the sensor threads with six or seven turns of PTFE tape to
prevent leakage.

Do not over tighten the sensor into its receptacle.

2. Hand tighten the sensor and then tighten one or two turns with a
wrench.

Quick Start Guide November 2020

Figure 1-1: Sensor Orientation

Install sensor within 80 ° of vertical.

Figure 1-2: Rosemount 3900/3900VP Sensor Dimensions

A. Temperature comp solution ground
B. Reference junction
C. pH electrode

D. ¾-in. male national pipe thread (MNPT)

E. 1-in. MNPT
F. Wrench flats 1.30 in. across

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November 2020 Quick Start Guide

Figure 1-3: Mount

A. 1½-in. x 1 in. reducing bushing
B. 1½-in. pipe tee PN 2002011

Straight flow shown

Note

Install sensor at least ten degrees above the horizon.

Table 1-1: Horizontal Pipe Tee (PN 2002011) Pressure/Temperature
Ratings

psig (kPa) °F (°C)

150 (1136) 150 (65)

128 (984) 160 (71)

102 (805) 170 (77)

80 (653) 180 (82)

57 (494) 200 (93)

48 (432) 210 (99)

Quick Start Guide 7

Quick Start Guide November 2020

Figure 1-4: Low Flow Cell PN 24091-00/24091-02

Inlet and outlet connections are stainless steel and take ¼-in. OD tubing.
Flow cell is polycarbonate with ¼-in. female national pipe thread (FNPT)
fittings.

Wetted materials

Body and nut: polyester/polycarbonate
Fittings: 316 stainless steel
Seals: silicone

Flow cell ratings

Temperature: 32 to 158 °F (0 to 70 °C)
Max. pressure: 90 pisg (721 kPa)

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November 2020 Quick Start Guide

Flow rate: 2 to 5 gph (7.6 to 18.9 LPH)

Sensor threaded
connection

24091-00: 1-in. national pipe thread (NPT) adapter
24091-02: ¾-in. NPT adapter

Quick Start Guide 9

Quick Start Guide November 2020

Figure 1-5: Jet Spray Cleaner

A. Cleaning solution by others
B. Solenoid valve or manual valve (supplied by others)
C. Corrosion resistant tubing (supplied by others)

D. Polypropylene ¼-in. compression fitting

E. ¼-in. 316 stainless steel

F. ¼-in. polypropylene
G. Stainless set screw for adjustable spray nozzle height
H. 2-in. NPT threads

I. Sensor
J. 1-in. PVC coupling for submersible applications (supplied by others)

K. 1-in. PVC or stainless conduit (supplied by others)

L. Cable

M. Timer supplied by others or use timer feature in Rosemount instrument

Note

Sensor must be installed at least 10 degrees above the horizon.

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November 2020 Quick Start Guide

The jet spray cleaner eliminates routine, manual sensor maintenance by
cleaning the sensor with water or compressed air. Use a solenoid valve to
control flow through the cleaner.

Note

You can alos use the jet spray cleaner with the handrail mounting assembly
(PN 11275-01, not shown) or mount it through the conduit as shown in

Figure 1-6.

Figure 1-6: Jet Spray Cleaner with pH Sensor

Quick Start Guide 11

Quick Start Guide November 2020

Figure 1-7: Low Flow Panel: PN SQP10077-LQD

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