Rosemount 381+ pH Sensor Manuals & Guides

Download

381+ Rebuildable pH Sensor

Instruction Manual

LIQ_MAN_381+

January 2013

81+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

This page left blank intentionally

Essential Instructions

Read this page before proceeding

Emerson Process Management designs, manufactures and tests its products to meet many national and international standards. Because these sensors are sophisticated technical products, you MUST properly install, use, and maintain them to ensure they continue to operate within their normal spec-

fications. The following instructions MUST be adhered to and integrated into your safety program

i when installing, using, and maintaining Rosemount Analytical 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 Process Management 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 Instruction 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 Process Management. 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 persons, to prevent electrical shock and personal injury.

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

DANGER: HAZARDOUS AREA INSTALLATION

Installations near flammable liquids or in hazardous area locations must be carefully evaluated by qualified on site safety personnel. This sensor is not Intrinsically Safe or Explosion Proof.

To secure and maintain an intrinsically safe installation, the certified safety barrier, transmitter, and sensor combination must be used. The installation system must comply with the governing approval agency (FM, CSA or BASEEFA/CENELEC) hazardous area classification requirements. Consult your analyzer/transmitter instruction manual for details.

Proper installation, operation and servicing of this sensor in a Hazardous Area Installation is entirely the responsibility of the user.

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.

Essential Instructions I

bout This Document 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

About this document

This manual contains instructions for installation and operation of the 381+ High Performance pH/ORP Sensor. The following list provides notes concerning all revisions of this document.

Rev. Level Date Notes

0 5/01 This is the initial 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 offering.

A 6/02 Updated multiple drawings throughout.

B 7/02 Added 1055 wiring drawing and updated kPa references.

C 9/02 Revised drawing captions on page 9.

D 9/04 Add Xmt wiring drawings and delete Ultrasonic cleaner.

E 11/07 Added M certs on back page.

G 3/12 Update addresses - mail and web

H 1/2013 Update document format per new guidelines. Update of product

information.

II Table of Contents

81+ pH Sensor Instruction Manual Table of Contents

LIQ_MAN_381+ January 2013

Contents

Section 1: Description and Specifications

1.1 Features and Applications ............................................................................................1

1.2 Specifications ...............................................................................................................2

1.3 Ordering Information ...................................................................................................2

Section 2: Installation

2.1 Installation....................................................................................................................5

2.2 Submerssion Installation..............................................................................................5

2.3 Insertion Installation.....................................................................................................6

2.4 Flow-Through Installation.............................................................................................6

2.5 Flow Powered Cleaner Installation................................................................................9

2.6 Wiring...........................................................................................................................9

Section 3: Start-Up and Operation

3.1 Start-Up .....................................................................................................................19

3.2 pH Calibration ............................................................................................................19

3.3 ORP Standardization ..................................................................................................19

Section 4: Maintenance

4.1 General.......................................................................................................................21

4.2 Sensor Removal..........................................................................................................21

4.3 Monthly Maintenance ................................................................................................21

4.4 Annual Maintenance...................................................................................................22

4.5 Electrode Checking and Standardi zation....................................................................22

Section 5: Troubleshooting

5.1 Sensor Troubleshooting .............................................................................................23

5.2 T. C. Element Evaluation .............................................................................................24

Section 6: Return of Materials

6.1 General.......................................................................................................................25

6.2 Warranty Repair .........................................................................................................25

6.3 Non-Warranty Repair .................................................................................................25

Table of Contents III

able of Contents 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

81+ pH Sensor Instruction Manual Section 1: Description and Specifications

LIQ_MAN_381+ January 2013

Section 1: Description and Specifications

1.1 Features and Applications

The Rosemount Analytical 381+ Sensor measures the pH or the Oxidation Reduction Potential (ORP) of aqueous solutions in pipelines, open tanks or ponds. The sensor is used in most indus trial applications including water and waste treatment plants.

The 381+pH Sensor features continuous on-line advanced diagnostics that allow the user to identify sensor failures such as coated reference junction or broken glass. Sensor diagnostics result in time and money savings by reducing the guesswork in sensor maintenance and replacement requirements. On-line sensor diagnostics are made possible by calculation of the temperature corrected glass electrode impedance and by characterizing failure modes.

The sensor is housed in a molded PES body and has two O-ring seals with breach lock threads which secure the PES cover. This provides a waterproof union for long operating life and easy removal for routine maintenance.

The modular body design eliminates the need for internal mounting brackets, terminal brackets and screws. All components are screw-type or plug-in-place, allowing for fast simple service.

The integral preamplifier conditions the high impedance glass elec trode signal at the sensor. The Rosemount Analytical method of preampli fication has become the industry standard for reliable pH measurement. In submersion applications at temperatures greater than 80°C, the preamplifier must be located in a remote junction box or in the instrument.

A double junction, gel-filled reference cell, a standard feature of the 381+, improves sensor life when unknown reference cell contaminants, such as sulfides, may exist. The gel solution maintains its viscosity at high temperatures, and resists the effect of pumping and dilution, resulting in an extended service life. A choice of wood or ceramic liquid junction allows the user to optimize performance by emphasizing reference lifetime (wood) or chemical resistance (ceramic).

In flow applications where crystalline or viscous coatings, such as calcium carbonate or petroleum oils, may coat the electrode surfaces and impede the sensor’s performance, the flowpowered cleaning option may be used. A specially designed flow chamber directs the process fluid in a circular path carrying four Teflon balls which clean the electrode surface, physically preventing accumulation of coating materials. Flow-powered cleaning is suitable for all hazardous area applications.

The 381+ comes with Pt100 temperature compensation and is compatible with the 54e, 56, 1055, 1056 and 1057 Analyzers, and 81, 1066, 3081, 4081, 5081-P, 6081, and Xmt-P pH/ORP Transmitters.

Description and Specifications 1

ection 1: Description and Specifications 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

1.2 Specifications

Materials of Construction:

Body, Cover and Flow Cell: Polyethersulfone (PES) O-Rings: Viton Measuring Electrode: Glass (and platinum or gold for ORP) Liquid Junction: Kynar/wood (Code 20) or Kynar/ceramic (Code 21) Solution Ground: 316 Stainless steel

Sensor Process Connections:

Submersion: 3/4 in. MNPT Insertion: 2 in. MNPT

Flow Through Cell: 3/4 in. MNPT inlet and outlet

Measuring Ranges:

ORP; -1500 to +1500 mV pH; AccuGlass 0-14

Minimum Conductivity: 75 mS/cm

Temperature Compensation: Automatic, 0 to 100°C (32 to 212°F)

Maximum Pressure/Temperature Rating:

790 kPa (abs) at 100°C (100 psig at 212°F)

Cable: 10 conductor, shielded cable

Weight/Shipping Weight: 1.0 kg/1.7 kg (2.2 lb/3.7lb)

1.3 Ordering Information

The 381+ pH/ORP Sensor is housed in a PES body suitable for insertion, submersion or flow through installation. The sensor includes an integral preamplifier, measuring electrode, double junction gel filled reference cell, automatic temperature compensation, and a choice of two cable lengths, 15 ft. or 50 ft. (4.5 or 15.2 m). The 381+ sensor provides on line advanced diagnostic capabilities and is compatible with the 54e pH/ORP and 56, 1055, 1056, and 1057 Analyzers and 81, 3081, 4081, 5081, and Xmt pH/ORP Two-Wire Transmitters, as well as 6081 Wireless Transmitters.

2 Description and Specifications

381+ pH Sensor Instruction Manual Section 1: Description and Specifications

LIQ_MAN_381+ January 2013

381+ INSERTION, SUBMERSION, FLOW THROUGH SENSOR

Level 0 FUNCTION

+ pH or ORP assembly for 54, 54e, 56, 1055, 1056, 1057, 1066, 81, 3081, 4081, 5081-P, Xmt-P and 6081

Level 1 TEMPERATURE COMPENSATOR

1 Automatic TC, 100 ohm RTD

Level 2 CABLE

40 15 ft (4.5 m) cable for integral sensor preamp (use option 55) 41 43 50 ft (15.2 m) cable for integral sensor preamp (use option 55)

Level 3 MEASURING ELECTRODE

10 General purpose pH, GPHT (0-14) 11

12 Ruggedized pH Electrode. For abrasive solutions 13 Platinum ORP Electrode 14 Gold ORP Electrode 15 HF pH Electrode. For HF concentrations less than 300 ppm

15 ft (4.5 m) coax cable w/BNC connector for remote sensor preamp and integral analyzer preamp (use option 52)

High pH Electrode, requires Code 21. For sodium concentrations greater than 1pH or continuous measurement above 11 pH

Level 4 LIQUID JUNCTION

20 Wood/Kynar Liquid Junction 21 Ceramic/Kynar Liquid Junction

Level 5 PREAMPLIFIER

52 Preamp NOT REQUIRED (use option 41) 55 Preamp for 54/e, 56, 81, 1055, 1056, 1057, 1066, 3081, 4081, 5081-P, 6081 and Xmt-P

Level 6 INSTALLATION

- No Selection 02 Submersion 03 Flow Through 04 Flow Through with Flow Powered Cleaner

Level 7 SPECIAL

- No Selection

99 Special (consult factory)

Description and Specifications 3

ection 1: Description and Specifications 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

ACCESSORIES

PART # DESCRIPTION

23550-00 23555-00 23557-00 Preamplifier for junction box, (54/e,

9210012 Buffer Solution, pH 4.01, 16 oz. 9210013 Buffer Solution, pH 6.86, 16 oz. 9210014 Buffer Solution, pH 9.18, 16 oz.

Junction Box, with extension board for point-to-point wiring Remote junction box with preamp (for 54/e, 56, 81, 3081, 4081, 1056, 1057. 1066, 5081-P, 6081, and Xmt-P compatible)

56, 81, 1056, 1057. 1066,

3081, 4081, 5081-P, 6081, and Xmt-P compatible)

SPARE PARTS

PART # DESCRIPTION

2000734 Liquid Junction, KYNAR/wood

2000735 Liquid Junction, KYNAR/Ceramic 22694-00 Electrode, pH, GP 22694-01 Electrode, High pH 22694-02 Electrode,pH, Rugged 22694-03 Electrode, pH, HF Resistant 22697-00 Electrode, Combination pH 22697-01 Electrode, HIgh pH, Combination 22723-00 Flow Powered Cleaner Balls (quantity 9) 22731-00 ORP Electrode, Platinum 22751-00 O-ring Kit (quantity 5) with O-ring PN 9550141 22751-01 O-ring Kit (quanity 5) with O-ring PN 9550128 22811-01 Flow Powered Cleaner - Retrofit Kit, code -00, -02 22892-00 Flow powered cleaner retrofit kit (for use with Option -03 sensors) 23018-00 Reference element (formerly 22688-00) 23551-00 Sensor Body, complete, Pt-100 23552-00 Sensor Cover with 15’ Cable 23552-01 Sensor Cover with 15’ Coax Cable 23552-02 Sensor Cover with 50’ Cable 32602-00 Flow Cell, PES 32605-00 Electrode, Shroud, Protective 32606-00 Flow Cell Coupling Nut, PES 32793-00 Flow Powered Cleaner, Ring 32794-00 Flow Powered Cleaner Chamber

9210342 Reference Cell Recharge, KCl gel, 250 ml

9550146 Viton O-Ring for Shroud

9550147 Viton O-Ring for Flow Cell 23561-00 Plug-in Preamplifier

4 Description and Specifications

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

Section 2: Installation

2.1 Installation

Prepare the sensor for instal la tion as follows (see Figure 2-1):

1. Remove the cover from the body by grasping the body and rotating the cover 1/4-turn counter clockwise.

2. When the cover breaks loose from the body, pull the cover straight out.

3. Lubricate the seals of the glass electrode with O-ring lubricant and install the glass electrode in the body. Tighten the electrode nut by hand. DO NOT use tools.

CAUTION

Do not get lubricant on tip of glass or metal electrode. It will disrupt the electrical circuit path.

4. Make sure the double junction electrode is threaded tightly.

5. Plug the preamplifier (or remote connector) onto the T.C. solution ground and microjunction reference electrode pins.

6. Connect the BNC connector from the glass elec trode to the preamplifier (or remote connector).

7. Install the body O-rings. Make sure they are clean, and not twisted. Make sure the covers mating surface faces are clean.

8. Lubricate the body O-rings with O-ring lubricant.

9. Plug the cable connector to the preamplifier, making sure the cable is toward the center of the body.

10. Install the cover on the body so that the threads will engage.

11. Rotate the cover until the triangle on the body aligns with (or falls within) the adjacent mark on the cover.

12. While holding the sensor in an upright position (see Figure 2-1), remove the 1/4-inch shipping plug from the electrode tip end of the sensor.

13. Install the liquid junction in place of the 1/4-inch plug, using TEFLON tape on the liquid junction threads.

CAUTION

DO NOT use pipe joint compound or pipe dope on the threads of the liquid junction. The electrical circuit will be disrupted if the liquid junction is contaminated.

2.2 Submersion Installation (code 02)

To install the sensor in process proceed as follows (see Figure 2-2):

1. Wrap TEFLON tape on 3/4-inch MNPT threads of cover and on standpipe threads.

CAUTION

Do not use a pipe wrench on the plastic parts. Severe damage could result.

Installation 5

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

2. Attach a 3/4-inch coupling to the sensor.

3. Attach electrode shroud to 2 inch MNPT.

4. Feed cable through the rigid standpipe.

5. Attach the rigid standpipe to the coupling.

CAUTION

Rigid standpipe should be water-tight.

6. Tighten all fittings and secure the standpipe to minimize sensor movement. Use flexible conduit at the top of the rigid standpipe to permit removal of the sensor for periodic maintenance.

7. Refer to Section 2.6 and wire the sensor to the transmitter as described.

2.3 Insertion Installation (code 00)

To install the sensor in the side of a tank, in a pipeline, or in a pipe “tee”, proceed as follows (see Figure 2-3):

CAUTION

Sensor must be installed within 80° of the vertical plane.

1. Use TEFLON tape on pipe joint, and install sensor as shown in Figure 2-3.

CAUTION

Do not use a pipe wrench on the plastic sensor parts. Severe damage could result.

2. Tighten all fittings and sensor.

3. Refer to Section 2.6 for wiring instructions.

4. If desired, the cable may be installed in a conduit. Flexible conduit MUST be used at the sensor for a short distance to permit removal for periodic maintenance. Use the 3/4-inch MNPT threads on the cover to attach the conduit to the sensor.

2.4 Flow Through Installation (code 03)

To install the sensor in the flow cell proceed as follows (see Figure 2-4):

1. Attach the flow cell’s 2-inch MNPT threads to the sample or process line. (Note flow direction on side of flow cell.)

2. Holding the sensor with the electrode pointing up, seat the upper O-ring (PN 9550146) flush with the sensor body above the 2-inch MNPT. Lubricate with O-ring lubricant.

3. With the coupling nut thread in place, thread the electrode shroud onto the sensor body (see Figure 2-4), insuring that the O-ring is properly seated and does not become pinched or twisted.

NOTE

The coupling nut must be inserted between the lower body assembly of the sensor and electrode shroud (see Figure 2-4).

6 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

FIGURE 2-1. Sensor Component Locator Diagram

Installation 7

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-2. Submersion Installation Diagram

FIGURE 2-3. Insertion Installation Diagram

DWG. NO. REV.

40038160 B

FIGURE 2-4. Flow Through Installation Diagram (Code 03 or 04)

DWG. NO. REV.

40038159 B

8 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

4. Next, place the lower O-ring (PN 9550147) in the flow cell and lubricate with O-ring lubri-

ant (PN 2001928).

5. Place sensor, coupling nut and electrode shroud in the flow cell. Insure that the O-ring is seated properly.

6. Rotate sensor until the key on electrode shroud drops into either the “open-flow” or “guarded” flow position. In "guarded" flow position, solid particles in the flow stream are diverted from electrode.

7. Tighten the coupling nut and the flow cell fittings.

NOTE

Electrode shroud and coupling nut should be hand tightened only. Do not use a wrench. When tightening process or sample line connectors to the flow cell do not use a pipe wrench on the flow cell. Severe damage may result.

2.4.1 Installation Procedures For Low Flow Conditions

It is extremely important that the measuring electrode and liquid junction of any pH/ORP sensor remain in contact with the process fluid at all times.

Under low flow conditions or where flow fluctuations are common, sensor contact with the process fluid may be interrupted unless piping procedures are followed to prevent it.

A customer supplied valve should be installed to eliminate head pressure when the sensor is being removed from the process. This valve may also serve as a grab sample take-off point.

The installation drawing (Figure 2-5) shows the recommended piping procedures for the 381+ pH/ORP sensor in low flow conditions.

2.5 Flow Powered Cleaner Installation (Code 04)

To install the sensor in a flow cell with flow powered cleaner, proceed as follows (see Figure 2-6);

1. Attach the flow cell’s 3/4-inch MNPT to sample or process line. Note flow direction shown on the side of the flow cell.

2. Insert the ring as shown in Figure 2-6. It should snap in place.

3. Place the chamber into the flow cell. Notch must be aligned for the chamber to go in place. Place the TEFLON balls (PN 22723-00 – 4 each) in the chamber.

4. Follow Steps 2 through 7 in Section 2.4 for sensor installation into flow assembly (see Figure 2-4).

2.6 Wiring

Connect the sensor wire to the trans mitter terminals as shown in Figures 2-7 through 2-22.

NOTE

For maximum EMI/RFI protection when wiring from the sensor to the junction box, the outer braid of the sensor should be connected to the outer braided shield of the extension cable. The outer braid of the extension cable to the instrument must be terminated at earth ground or by using an appropriate metal cable gland fitting that provides a secure connection to the instrument case.

Installation 9

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-5. Installation details – low flow conditions (Code 03 or 04)

FIGURE 2-6. Flow powered cleaner component locator (Code 04)

DWG. NO. REV.

40038107 C

DWG. NO. REV.

40038108 C

10 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

FIGURE 2-7. Wiring 381+ to 54, 54e, 81, 3081, 4081, 5081-P

WG. NO. REV.

40396P07 F

FIGURE 2-8. Wiring 381+ -55 through Junction Box with Extension Board (PN 23550-00) to 54, 54e, 81, 3081, 4081, 5081-P

NOTE: Junction Box Specs in Fig.2-8.

DWG. NO. REV.

40396P08 B

Installation 11

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-9. Wiring 381+ -52 through Junction Box with Preamp (PN 23557-00) to 54, 54e, 81, 3081, 4081

nd 5081-P

DWG. NO. REV.

40396P09 B

12 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

IGURE 2-10. Wiring to Solu Cube Junction Box (PN 23054-03)

DWG. NO. REV.

40381+10 A

FIGURE 2-11. Wiring 381+-31-40/43-55 Sensor to 1055-10-22-32 Analyzer

DWG. NO. REV.

40105540 D

Installation 13

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-12. Wiring 381+-52 Sensor to 1055-22-32 Analyzer

FIGURE 2-13. Wiring 381+-55 Sensor to 1055-22-32 Analyzer through Remote Junction Box PN 23555-00

14 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

FIGURE 2-14. Wiring 381+-41-52 Sensor to Xmt-P Transmitter

FIGURE 2-15. Wiring 381+-55 Sensor to Xmt-P Transmitter

Installation 15

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-16. Wiring 381+ -41-52 Sensor to the 56, 1056, and 1057 Analyzers

FIGURE 2-17. Wiring 381+ -55 Sensor to the 56, 1056, and 1057 Analyzers

16 Installation

81+ pH Sensor Instruction Manual Section 2: Installation

LIQ_MAN_381+ January 2013

FIGURE 2-18. Wiring 381+ -41-52 Sensor to the 6081 Wireless Transmitter

FIGURE 2-19. Wiring 381+ -55 Sensor to the 6081 Wireless Transmitter

Installation 17

ection 2: Installation 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

FIGURE 2-20. Wiring 381+ -41-52 Sensor to the 1066 Transmitter

FIGURE 2-21. Wiring 381+ -55 Sensor to the 1066 Transmitter

18 Installation

81+ pH Sensor Instruction Manual

LIQ_MAN_381+ January 2013

ection 3: Startup

Section 3: Start-Up

3.1 Start-Up

Greater measurement accuracy may be obtained by calibrating the 381+ sensor and instrument as a loop. Please refer to the applicable analyzer/transmitter instruction manual for calibration procedures.

3.2 pH Calibration

3.2.1 Buffer Solution Method

The 381+ pH sensor and analyzer/transmitter may be calibrated by immersing the sensor's measuring tip into two pH buffer solutions of different pH values (two point calibration). This is the preferred method because the analyzer can calculate the slope (efficiency) of the pH sensor.

NOTE

Thin film coatings on the glass electrode may cause a slight shift in calibration. Since some coating will be encountered under normal operating conditions, permit the electrode to condition itself, and perform the procedure described in Section 3.2.2, grab sample method.

3.2.2 Grab Sample Method

This method does not require the sensor to be removed from the process. The grab sample method is recommended immediately after and in between scheduled two point calibration procedures.

1. Take a sample of the process as close to the sensor as possible.

2. Check the sample with a calibrated portable or laboratory analyzer. This analyzer should be automatically or manually temperature compensated to the temperature of the sample being measured.

3. Refer to the analyzer/transmitter instruction manual for process standardization after buffer calibration.

3.3 ORP Standardization

An ORP loop is best calibrated using an ORP standard solution method.

3.3.1 Quinhydrone Solution

CAUTION

The solution used during the following check is an acid and should be handled with care. Follow the directions of the acid manufacturer. Wear the proper equip ment. Do not let the solution come in contact with skin or clothing. If contact with skin is made, immediately rinse with clean water.

Startup 19

ection 3: Startup

January 2013 LIQ_MAN_381+

81+ pH Sensor Instruction Manual

TABLE 3-1. ORP of Saturated Quinhydrone Solutions (in Millivolts)

pH 4 pH 7

Temp. °C 20 25 30 20 25 30 Millivolt Potential 268 264 260 94 87 80

508-80Z).

(PN

e so

dro

ed qu

rd so

P st

sed O

A c

fer

7 pH

4 pH

her

e c

dro

g a

ade by

be m

have

he so

red

Qu a

e 3-1.

l e a

dro

d t

he O

here

e i

he res

P v

re n

be requ

few

e so

ght

20 m

a ew

ld be w

g po

ed qu

e o

ld be m

dro

ade e

e so

h t

e t

e s

he v

g per

ver

e o

sed

re u

3.3.2

Ferric-Ferrous Ammonium Sulfate Solution

ue fo

ivo

s m

n i

nta

h wil

n whic

red i

508 fo

2 gra

s of

e so

n a

s of

er d 56.

glass c

our

s of

agent

wat

2 m

e up to

ience.

grade fer

agen grade fer

s of

000 m

476 ±

P of

ner.

ed wat

Rosem

herwi

ncent

20 m

rous a

V at

ount

se y

s prefer

ed sul

rat

s so

25 C

Ana ou c

sul

lyt

n prep

fat

red, b

fur

n (fer

e [F

e to

sul

fer

re t

fat

tap wat

-fer

era

s t

he so

e [F

d suf

nce i

e(S

rous

s O

i f

n m

icien

re stabl

h m

s a

fer

n of

s so

when sto

ne ye

ely o

approxi sta wi

ber

num

re p

rd as s

ow.

bel

ula

he fo

h t

CAUTION

The solution used during the following check is an acid and should be handled with care. Follow the directions of the acid manu facturer. Wear the proper equip ment. Do not let the solution come in contact with skin or clothing. If contact with skin is made, immediately rinse with clean water.

lve 39.

sso

n, d

re so

prep

2 gra

d 48.

20] a

• 6H

)

12H ac wat

a value aris ele can be

n approxi

0] i

ceptabl

s is to b

when mea

ctrod

e).

sul

s are

ieve

ely 700 m

ly ad

reful

d c

owly a

n vo

he to

g t

duce a

pro

e) wil

fat

due to the rather large liquid reference junction potentials which can

cte

exp

this strongly acidic and concentrated solution. However, if the measuring

suring

clean and in good operating condition, consistent repeatable calibrations

ept

k d.

) •

•

NOTE

Most industrial applications have a number of ORP reactions occurring in sequence or simultaneously. There can be several components that are oxidized or reduced by the reagents that are used. Theoretically, the ORP potential is absolute because it is the result of the oxidation-reduction equilibrium. However, the actual measured potential is dependent on many factors, including the condition of the surface of the ORP platinum electrode. Therefore, the sensor should be allowed 1-2 hours to become “conditioned” to the stream to be measured when first setting up or after being cleaned.

20 Startup

81+ pH Sensor Instruction Manual

LIQ_MAN_381+ January 2013

ection 4: Maintenance

Section 4: Maintenance

4.1 General

The 381+ sensor requires periodic cleaning and calibration. Since this sensor is rebuildable, components may be replaced as required.

4.2 Sensor Removal

WARNING

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!

Remove the sensor from the process for cleaning, calibration or component replacement.

4.3 Monthly Maintenance

4.3.1 pH Electrode Cleaning

If the electrode is coated or dirty, it may be cleaned as follows:

1. Remove the sensor from process as instructed in Section 4.2.

2. Wipe the glass bulb with a soft, clean, lint free cloth or tissue. If this does not remove the dirt or coating, proceed to step 3. If the sensor appears to be clean, go to step 5.

3. Wash the glass bulb in a strong detergent solution and thoroughly rinse with tap water. If the bulb still appears to have a coating, proceed to step 4.

CAUTION

The solution used in the following step is an acid and should be handled with care. Follow the directions of the acid manufacturer. Wear the proper protective equipment. Do not let the solution come in contact with skin or clothing. If contact with the skin is made, immediately rinse with clean water.

4. If step 3 does not clean the electrode tip, remove the glass electrode from the sensor body. Following the caution above, wash the glass electrode bulb in dilute 5% hydrochloric acid solution and then rinse it thoroughly in tap water. Replace the glass electrode if it cannot be cleaned. Install the clean or new glass electrode into the 381+ sensor body and proceed to step 5.

5. Buffer calibrate the sensor (Refer to Section 3.0). If the sensor appears to respond sluggishly to pH change, soaking it overnight in a weak acid solution (5% hydrochloric acid) may improve its response. Be sure to follow the CAUTION above and to rinse the sensor’s tip thoroughly with tap water. If the sensor will not calibrate, it must be replaced.

4.3.2 Cleaning Platinum Electrode

The electrode can be restored to normal operation by simply cleaning the platinum electrode with baking soda. Polish it by rubbing it with a damp paper towel and baking soda until a bright, shiny appearance is attained.

Maintenance 21

ection 4: Maintenance

January 2013 PN LIQ_MAN_381+

81+ pH Sensor Instruction Manual

4.4 Annual Maintenance

1. Remove the sensor from the process.

2. While holding the sensor in an upright position, remove and discard the liquid junction.

3. Drain the solution from the sensor body and rinse the inside of the body with clean, warm water.

4. Remove the cover from the body by grasping the body and rotating the cover – turn in the counter-clockwise direction.

5. When the cover breaks loose from the body, pull straight out on the cover and disconnect the cable connector from the preamplifier.

6. Disconnect the electrode BNC connector from the preamplifier or remote connector and then unplug the preamplifier or remote connector from the sensor body.

7. Remove and discard the microjunction reference electrode.

8. Remove and discard the O-rings on the body.

9. Install a new microjunction reference electrode in the body.

10. Make sure the upper and lower body O-ring sealing surfaces are clean, and lubricate the new O-rings with O-ring lubricant. Install the O-rings making sure they are not twisted.

11. Install the preamplifier or remote connector on the sensor body and make sure all connections are secure and that both O-rings are in place.

12. Install the cover on the sensor body so the threads will engage.

13. Rotate the cover until the triangle on the sensor body aligns with (or falls within) the adjacent mark on the cover.

CAUTION

DO NOT use a pipe wrench on the body or cover. Severe damage could result.

14. While holding the sensor in an upside down position, fill the reference chamber in the body (through the liquid junction opening) with gel solution (PN 9210342). Care must be taken to remove as much air as possible from the reference cell.

CAUTION

DO NOT use pipe joint compound or pipe dope on the threads of the liquid junction. The electrical circuit will be disrupted if the liquid junction is contaminated

15. Wrap TEFLON tape on a new liquid junction and install the liquid junction in the body.

16. Calibrate the sensor per Section 3.0. Install the sensor as described in Section 2.0.

NOTE

Flow-through sensor (Codes 03 & 04). Upper and lower flow cell O-rings should be replaced at this time. Lubricate new O-rings with O-ring lubricant and reinstall sensor as described in Section 2.4 and Section 2.5.

4.5 Electrode Checking and Standardi zation

Refer to Section 3.2 or Section 3.3 for pH or ORP electrode checking, start-up and standardization.

22 Maintenance

81+ pH Sensor Instruction Manual

LIQ_MAN_381+ January 2013

ection 4: Troubleshooting

Section 5: Troubleshooting

5.1 Sensor Troubleshooting

In the event of a malfunction, refer to Table 5-1 below. This table lists the 54, 54e, 56, 81, 1056, 1057, 3081, 4081, 5081, 6081, and Xmt diagnostic messages, description of the problem and remedy for the 381+ pH/ORP sensor. Refer to instrument’s instruction manual for screen displays.

TABLE 5-1. Troubleshooting

DIAGNOSTIC MESSAGE DESCRIPTION OF PROBLEM REMEDY

“Calibration Warning” 1. Aged glass 1. Perform buffer calibration

2. Sensor not immersed 2. Be sure electrode measuring tip is in process

“Cracked glass failure” Broken or cracked glass Replace Sensor

“High reference impede” 1. Liquid junction coated 1. Clean sensor; replace if necessary

2. Reference Cell gel depleted 2. Replace sensor

3. Sensor not immersed 3. Be sure electrode measuring tip is in process

“Input voltage high” pH input shorted or sensor Check wiring. Replace sensor if “Input voltage low” miswired necessary

“Old glass warning” 1. Glass electrode worn out 1. Replace sensor

2. Sensor not immersed 2. Be sure electrode measuring tip is in process

“Reference offset err” Reference electrode poisoned Replace sensor (offline only)

“Ref voltage high” Reference shorted or sensor Check wiring. Replace sensor if “Ref voltage low” miswired necessary

“Sensor line open” 1.

“Sensor miswired” 1.

Open wire between sensor and analyzer

2. Interconnecting cable greater than 2. Relocate analyzer

1000 ft.

Open wire between sensor and analyzer

2. Bad preamplifier 2. Replace preamplifier

1. Check sensor wiring

1. Check wiring

“Temp error high” 1. Open or shorted RTD 1. Replace sensor “Temp error low” 2. Temperature out of range 2. Check process temperature

Troubleshooting 23

ection 5: Troubleshooting 381+ pH Sensor Instruction Manual

January 2013 PN LIQ_MAN_381+

5.2 T. C. Element Evaluation

Table 5-2, below, is a ready reference of RTD resistance values at various temperatures. These values may be used for test and evaluation of the sensor.

TABLE 5-1. Element Resistance

Temp °C Resistance (±1%)

0 100.00 ohms 10 103.90 ohms 20 107.79 ohms 25 109.73 ohms

30 111.67 ohms 40 115.54 ohms 50 119.40 ohms 60 123.24 ohms

70 127.07 ohms 80 130.89 ohms 90 134.70 ohms

100 138.50 ohms

To check the 100 ohm T.C. element, proceed as follows:

1. Using an ohmmeter, check the resistance at the body or between the red and white wires of the sensor cable with the transmitter disconnected.

2. The resistance shall agree with the resistance shown in Table 5-2.

3. The T.C. element resistance for other temperatures may be calculated as follows: Each degree difference equals 0.385 ohm.

NOTE

0hmic values are read across the RTD element and are based on the manufacturers stated value of ±1%. Allow enough time for the RTD element to stabilize to the surrounding temperature.

24 Troubleshooting

81+ pH Sensor Instruction Manual Section 6: Return of Material

PN LIQ_MAN_381+ January 2013

Section 6: Return of Material

6.1 General

To expedite the repair and return of instruments, proper communication between the customer and the factory is important. A return material authorization number is required. Call 1-800-6547768 or (949) 757-8500. The “Return of Materials Request” form is provided for you to copy and use in case the situation arises. The accuracy and completeness of this form will affect the processing time of your materials.

6.2 Warranty Repair

The following is the procedure for returning products still under warranty.

1. Contact the factory for authorization.

2. Complete a copy of the “Return of Materials Request” form as completely and accurately as possible.

3. To verify warranty, supply the factory sales order number or the original purchase order number. In the case of individual parts or sub-assemblies, the serial number on the unit must be supplied.

4. Carefully package the materials and enclose your “Letter of Transmittal” and the completed copy of the “Return of Materials Request” form. If possible, pack the materials in the same manner as it was received.

IMPORTANT

Please see second section of “Return of Materials Request Form”. Compliance to the OSHA requirements is mandatory for the safety of all personnel. MSDS forms and a certification that the instruments have been disinfected or detoxified are required.

5. Send the package prepaid to:

Rosemount Analytical Inc. 2400 Barranca Parkway Irvine, CA 92606 Attn: Factory Repair Mark the package: Returned for Repair RMA No. __________

6.3 Non-Warranty Repair

1. Contact the factory for authorization.

2. Fill out a copy of the “Return of Materials Request” form as completely and accurately as possible.

3. Include a purchase order number and make sure to include the name and telephone number of the right individual to be contacted should additional information be needed.

4. Do Steps 4 and 5 of Section 6.2.

NOTE

Model No. __________

Consult the factory for additional infor mation regarding service or repair.

Return of Material 25

ection 6: Return of Material 381+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

RETURN OF MATERIALS REQUEST

RETURNED BY: BILL TO:

•IMPORTANT! This form must be completed to ensure expedient factory service.

_____________________________ _____________________________ ____________________________

NOTICE TO SENDER: CUSTOMER/USER MUST SUBMIT MATERIAL SAFETY SHEET (MSDS) or complete stream composition, and/or letter certifying the materials have been disinfected and/or detoxified when returning any product, sample or material that have been exposed to or used in an environment or process that contains a hazardous material any of the above that is submitted to rosemount analytical without the msds will be returned to sender c.o.d. fo9r the safety and health of our employees. we thank you in advance for compliance to this subject.

SENSOR OR CIRCUIT BOARD ONLY:

(Please reference where from in MODEL / SER. NO. Column)

1. PART NO.

2. PART NO. ______________________ 2. MODEL ______________________ 2. SER. NO. ___________________

3. PART NO. ______________________ 3. MODEL ______________________ 3. SER. NO. ___________________

4. PART NO. ______________________ 4. MODEL ______________________ 4. SER. NO. ___________________

REASON FOR RETURN PLEASE CHECK ONE:

REPAIR AND CALIBRATE

EVALUATION

REPLACEMENT REQUIRED?nYESnNO _______________________________________________________

DESCRIPTION OF MALFUNCTION:

______________________ 1. MODEL ______________________ 1. SER. NO. ___________________

DEMO EQUIPMENT NO. ______________________________________

OTHER (EXPLAIN) __________________________________________

________________________________________________________________________________________________

WARRANTY REPAIR REQUESTED:

YES. REFERENCE ORIGINAL ROSEMOUNT ANALYTICAL ORDER NO. ______________________________________________

CUSTOMER PURCHASE ORDER NO. ______________________________________________

NO. PROCEED WITH REPAIRS-INVOICE AGAINST P.O. NO. _____________________________________________________

NO. CONTACT WITH ESTIMATE OF REPAIR CHARGES: BY LETTERnOR BY PHONE

NAME _________________________________________________________________ PHONE ____________________ ADDRESS _________________________________________________________________________________________

______________________________________________________________________

RETURN AUTHORITY FOR CREDIT ADJUSTMENT [Please check appropriate box(s)]

WRONG PART RECEIVED

DUPLICATE SHIPMENT REFERENCE ROSEMOUNT ANALYTICAL SALES ORDER NO. ____________________

RETURN FOR CREDIT RETURN AUTHORIZED BY: __________________________________________

WARRANTY DEFECT _________________________________________________________________________________

24-6047

REPLACEMENT RECEIVED

ZIP ______________________

26 Return of Material

81+ pH Sensor Instruction Manual Warranty Information

PN LIQ_MAN_381+ January 2013

WARRANTY

Seller warrants that the firmware will execute the programming instructions provided by Seller, and that the Goods manufactured or Services provided by Seller will be free from defects in materials or workmanship under normal use and care until the expiration of the applicable warranty period. Goods are warranted for twelve (12) months from the date of initial installation or eighteen (18) months from the date of shipment by Seller, whichever period expires first.

onsumables, such as glass electrodes, membranes, liquid junctions, electrolyte, o-rings, catalytic beads, etc.,

C and Services are warranted for a period of 90 days from the date of shipment or provision.

Products purchased by Seller from a third party for resale to Buyer ("Resale Products") shall carry only the warranty extended by the original manufacturer. Buyer agrees that Seller has no liability for Resale Products beyond making a reasonable commercial effort to arrange for procurement and shipping of the Resale Products.

If Buyer discovers any warranty defects and notifies Seller thereof in writing during the applicable warranty period, Seller shall, at its option, promptly correct any errors that are found by Seller in the firmware or Services, or repair or replace F.O.B. point of manufacture that portion of the Goods or firmware found by Seller to be defective, or refund the purchase price of the defective portion of the Goods/Services.

All replacements or repairs necessitated by inadequate maintenance, normal wear and usage, unsuitable power sources, unsuitable environmental conditions, accident, misuse, improper installation, modification, repair, storage or handling, or any other cause not the fault of Seller are not covered by this limited warranty, and shall be at Buyer's expense. Seller shall not be obligated to pay any costs or charges incurred by Buyer or any other party except as may be agreed upon in writing in advance by an authorized Seller representative. All costs of dismantling, reinstallation and freight and the time and expenses of Seller's personnel for site travel and diagnosis under this warranty clause shall be borne by Buyer unless accepted in writing by Seller.

Goods repaired and parts replaced during the warranty period shall be in warranty for the remainder of the original warranty period or ninety (90) days, whichever is longer. This limited warranty is the only warranty made by Seller and can be amended only in a writing signed by an authorized representative of Seller. Except as otherwise expressly provided in the Agreement, THERE ARE NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO ANY OF THE GOODS OR SERVICES.

RETURN OF MATERIAL

Material returned for repair, whether in or out of warranty, should be shipped prepaid to:

Emerson Process Management Liquid Division 2400 Barranca Parkway Irvine, CA 92606

The shipping container should be marked:

RETURN FOR REPAIR

Model _______________________________

The returned material should be accompanied by a letter of transmittal which should include the following information (make a copy of the "Return of Materials Request" found on the last page of the Manual and provide the following thereon):

1. Location type of service, and length of time of service of the device.

2. Description of the faulty operation of the device and the circumstances of the failure.

3. Name and telephone number of the person to contact if there are questions about the returned material.

4. Statement as to whether warranty or non-warranty service is requested.

5. Complete shipping instructions for return of the material.

Adherence to these procedures will expedite handling of the returned material and will prevent unnecessary additional charges for inspection and testing to determine the problem with the device.

If the material is returned for out-of-warranty repairs, a purchase order for repairs should be enclosed.

Warranty Information 27

81+ pH Sensor Instruction Manual

January 2013 LIQ_MAN_381+

NOTES

81+ pH Sensor Instruction Manual

PN LIQ_MAN_381+ January 2013

This page left blank intentionally

LIQ_MAN_381+

Rev. H

January 2013

facebook.com/EmersonRosemountAnalytical

AnalyticExpert.com

Credit Cards for U.S. Purchases Only.

twitter.com/RAIhome

youtube.com/user/RosemountAnalytical

Emerson Process Management

2400 Barranca Parkway Irvine, CA 92606 USA Tel: (949) 757-8500 Fax: (949) 474-7250

rosemountanalytical.com

of one of the Emerson Process Management family of companies. All other marks are the property of their respective owners.

The contents of this publication are presented for information purposes only, and while effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability.

All sales are governed by our terms and conditions, which are available on request. We reserve the right to modify or improve the designs or specifications of our products at any time without notice.

Rosemount 381+ pH Sensor Manuals & Guides

Specifications and Main Features

Frequently Asked Questions

User Manual