Rosemount Analytical 499 Operating Manual

Rosemount™ 499ATrDO

Trace Dissolved Oxygen Sensor

Quick Start Guide

LIQ-QSG-499ATrDO, Rev H

July 2017

Safety information

CAUTION!

SENSOR/PROCESS APPLICATION COMPATIBILITY

The wetted sensor material may not be compatible with process composition and operating conditions. Application compatibility is
entirely your responsibility.

CAUTION!

EQUIPMENT DAMAGE

Do not exceed pressure and temperature specifications.

Pressure: 65 psig (549 kPa abs) max. Temperature: 32 to 122 °F (0 to 50 °C)

Contents

Contents

Chapter 1 Plan ..................................................................................................................................1

1.1 Unpacking and inspection .............................................................................................................. 1

1.2 Product description ........................................................................................................................1

1.3 Specifications .................................................................................................................................1

Chapter 2 Install ...............................................................................................................................5

Chapter 3 Wire .................................................................................................................................7

Chapter 4 Calibrate ........................................................................................................................ 15

4.1 Zero point calibration ...................................................................................................................15

4.2 Full scale .......................................................................................................................................15

Chapter 5 Maintenance .................................................................................................................. 17

5.1 Cleaning the membrane ...............................................................................................................17

5.2 Replacing the electrolyte solution and membrane ....................................................................... 17

5.3 Storage ........................................................................................................................................ 19

Chapter 6 Accessories .................................................................................................................... 21

Quick Start Guide i

Contents

ii Rosemount 499ATrDO

1 Plan

1.1 Unpacking and inspection

1. Inspect the shipping container. If it is damaged, contact the shipper immediately for
instructions.

2. Save the box.

3. If there is no apparent damage, unpack the container. Be sure all items shown on the
packing list are present. If items are missing, notify Rosemount immediately.

1.2 Product description

Rosemount 499ATrDO Sensor PartsFigure 1-1:

Plan

A. Membrane retainer

Membrane assembly

B.
C. O-ring
D. Cathode
E. Electrolyte fill plug (wrap with pipe tape)
F. Pressure equalizing port
G. Sensor cable (integral cable shown)

1.3 Specifications

Sensor specificationsTable 1-1:

Physical characteristics Specifications

Range 0.1 ppb to 20 ppm

Pressure 0 to 65 psig (101 to 549 kPa abs)

Temperature (operating) 0 to 50 °C (32 to 122 °F)

Quick Start Guide 1

Plan

Sensor specifications (continued)Table 1-1:

Physical characteristics Specifications

Process connection 1 in. MNPT

®

Wetted parts Noryl

(1)

, Viton, EPDM, Teflon®

Cathode Gold (not normally wetted)

Accuracy Accuracy depends on the accuracy of the chemical test used

to calibrate the sensor.

Linearity ±5% of reading or ±3 ppb (whichever is greater) at 77 °F

(25 °C)

Repeatability ±2% of reading at constant temperature

Response time < 20 sec to 90% of final reading at 25 °C (77 °F) (0 to 200 ppb

oxygen)

Membrane permeability connection Defined between 41 and 95 °F (0 and 50 °C)

Process connection 1 in. MNPT

Electrolyte volume 25 mL (approx.)

Electrolyte life 4 to 6 months (approx.)

Sensor life 2 years (approx.)

Accuracy at 77 °F (25 °C) following air calibration

<20 ppb ±1 ppb

>20 ppb ±5% of reading

(2)

, and silicone

Cable length (standard integral cable) 25 ft (7.6 m)

Cable length (maximum) 300 ft (91 m)

Drift <4% over 60 days

Sample flow 1.6-6.3 gph (100-400 mL/min) recommended. Response

changes less than 2% when flow is maintained at recommen­ded range. At 0.8 gph (50 mL/min), sensor response is about
90% of value at 100 mL/min.

Process connections Sensor must be used in flow cell PN 24091-01

Comedown time to 1 ppb New sensor: < 5 hours

Following membrane change: < 1 hour

Following air calibration: < 1 hour

Shelf life 3 months. If the shelf life has been exceeded, the sensor can

still be used. The comedown time will be longer.

Weight/shipping weight 1 lb/3 lb (0.5kg /1.5 kg)

(1) Noryl is a registered trademark of General Electric.
(2) Viton and Teflon are registered trademarks of E.I. duPoint de Nemours & Co.

2 Rosemount 499ATrDO

Other specificationsTable 1-2:

Maximum tempera-

Type PN Wetted materials Process connection

Low
flow
cell

(1) Temperature and pressure specifications for the low flow cell exceed the temperature and pressure specifications for the sensor.

24091-00 Polycarbonate/poly-

ester, 316 stainless

(1)

steel, and silicone

Compression fitting
for 1/4 in. O.D. tubing
or 1/4 in. FNPT

ture Maximum pressure

158 °F (70 °C) 90 psig (722 kPa abs)

Plan

Quick Start Guide 3

Plan

4 Rosemount 499ATrDO

2 Install

The gray PVC cap contains a solution of sodium sulfite. Remove the cap before installing
the sensor.

WARNING!

POISONOUS SUBSTANCE
The cap contains sodium sulfite solution. Avoid contact with skin or eyes. Do not swallow!

Install

Sensor OrientationFigure 2-1:

Quick Start Guide 5

Install

Low Flow Cell (PN 24091-00)Figure 2-2:

6 Rosemount 499ATrDO

3 Wire

NOTICE

For additional wiring information on this product, including sensor combinations not shown
here, please refer to the Liquid Transmitter Wiring Diagrams.

Wire

Figure 3-1:

Rosemount 499ATrDO-54 Sensor Wiring to Rosemount 1056 and 56
Transmitters

Quick Start Guide 7

Wire

Figure 3-2:

Rosemount 499ATrDO-54-60 and 499ATrDO-54-VP Sensor Wiring to
Rosemount 1056 and 56 Transmitters

8 Rosemount 499ATrDO

Wire

Rosemount 499ATrDO-54 Sensor Wiring to Rosemount 5081 transmitterFigure 3-3:

Quick Start Guide 9

Wire

Figure 3-4:

Rosemount 499ATrDO-54-60 and 499ATrDO-54-VP Sensor Wiring to
Rosemount 5081 Transmitter

10 Rosemount 499ATrDO

Wire

Rosemount 499ATrDO-54 Sensor Wiring to Rosemount 1066 TransmitterFigure 3-5:

Quick Start Guide 11

Wire

Figure 3-6:

Rosemount 499ATrDO-54-60 and 499ATrDO-54-VP Sensor Wiring to
Rosemount 1066 Transmitter

Figure 3-7:

Rosemount 499ATrDO Sensor Pin-out Diagram (Top View of Connector
End of Sensor)

12 Rosemount 499ATrDO

When making a connection through a junction box (PN 23550-00), wire point-to-point.

NOTICE

Use a wire nut and pigtail (included) when connecting several wires to the same terminal.

Wire

Quick Start Guide 13

Wire

14 Rosemount 499ATrDO

4 Calibrate

4.1 Zero point calibration

Even in the absence of oxygen, the Rosemount 499ATrDO sensor generates a small signal
called the zero current. Normally, the zero current is less than 5 nA, which introduces nor
more than a 0.5 ppb error in measurement. Zero the sensor when it is first placed in service
and every time the fill solution is changed.
To zero the sensor:

Procedure

1. Pour a cup of deionized or bottled water.

2. Add a teaspoon of sodium sulfite to the water.

3. Place the sensor in the water.

4. Wait until the sensor current has reached a stable low value (at least two hours).

5. Measure the current.

Calibrate

a. If it is less than 5 nA, do not zero the sensor.

b. If it is between 5 and 10 nA, allow the sensor to run overnight. Zero the sensor if

the reading is still between 5 and 10 nA and is stable.

c. If it is greater than 10 nA, call the factory.

4.2 Full scale

The Rosemount 499ATrDO sensor is best calibrated by exposing the sensor to water­saturated air.

1. Pour a small amount of water into a cup.

2. Suspend the sensor, keeping the membrane dry, about 1/4 in. (6 mm) above the
surface of the water.

3. Once readings are stable, which should take no longer than 20 minutes, follow the
analyzer prompts to complete the calibration.

The analyzer automatically calculates the equilibrium solubility of atmospheric
oxygen in water under the prevailing temperature and barometric pressure.

4. After calibration, go to the Diagnostics menu and check the sensitivity.

The sensitivity should be between 3,600 and 6,100 nA/ppm.

For more information, refer to the transmitter manual.

Quick Start Guide 15

Calibrate

Prolonged exposure to air may affect the linearity of the sensor. If the cumulative
exposure to air is less than about five hours per year, sensor linearity should be
within specification. If cumulative exposure exceeds five hours per year, restore
linear response of the sensor by draining the electrolyte solution and replacing it
with fresh.

16 Rosemount 499ATrDO

5 Maintenance

Periodic maintenance and cleaning are required for best performance of the sensor.
Generally, the membrane and fill solution should be replaced every four to six months. The
optimum maintenance frequency is best determined by experience. Periodically check the
zero current and sensitivity. If the zero current is less than about 5 nA, and the current in
the air is between 30 and 45 nA with a variability of less than 2%, the sensor does not need
maintenance.

WARNING!

PRESSURIZED SPRAY INJURY
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!

5.1 Cleaning the membrane

Maintenance

Keep the membrane clean and free from solid corrosion products. Clean the membrane
with water sprayed from a wash bottle or gently wipe the sensor with a soft, clean tissue.

5.2 Replacing the electrolyte solution and membrane

WARNING!

HARMFUL SUBSTANCE
Fill solution may cause irritation. May be harmful if swallowed. Read and follow manual.

Procedure

1. Unscrew the membrane retainer.

2. Remove the membrane assembly and O-ring.

See Figure 1-1.

3. Hold the sensor over a container with the cathode pointing down.

4. Remove the fill plug.

5. Allow the electrolyte solution to drain out.

6. Inspect the cathode.

a. If it is tarnished, clean it by gently rubbing in the direction of the existing

scratches (do not use a circular motion) with 400-600 grit silicon carbide
finishing paper.

Quick Start Guide 17

Maintenance

7. Remove the old pipe tape from the plug.

8. Wrap the plug with one or two turns of pipe tape.

9. Prepare a new membrane.

a. Hold the membrane assembly with the cup formed by the membrane and

membrane holder pointing up.

b. Place a drop of isopropyl alcohol in the cup.

c. Slowly add about 20 drops of electrolyte solution to the cup.

This step is important, because alcohol wets the inside surface of the membrane
and ensures that no air bubbles will be trapped when the membrane assembly is
placed over the cathode.

d. Fill the cup with electrolyte solution.

e. Leave the membrane assembly filled with electrolyte solution and set it aside.

10. Hold the sensor at about a 45° angle with the cathode end pointing up.

11. Add electrolyte solution through the fill hole until the liquid overflows.

12. Tap the sensor near the threads to release trapped air bubbles.

13. Add more electrolyte solution if necessary.

14. Place the fill plug in the electrolyte port and begin screwing it in.

15. After several threads have engaged, rotate the sensor so that the cathode is

pointing up and continue tightening the fill plug.

Do not overtighten.

16. Place a new O-ring in the groove around the cathode post.

17. Cover the holes at the base of the cathode stem with several drops of electrolyte

solution.

18. Insert a small blunt probe, like a toothpick with the end cut off, through the pressure

equalizing port.

See Figure 1-1.

CAUTION!

EQUIPMENT DAMAGE

Do not use a sharp probe. It will puncture the bladder and destroy the sensor.

19. Gently press the probe against the bladder several times to force liquid through the

holes at the base of the cathode stem. Keep pressing the bladder until no air bubbles
can be seen leaving the holes. Be sure the holes remain covered with electrolyte
solution.

20. Place a drop of electrolyte solution on the cathode; then place the membrane

assembly over the cathode.

21. Screw the membrane retainer in place.

The sensor may require several hours operating at the polarizing voltage to
equilibrate after the electrolyte solution has been replenished.

18 Rosemount 499ATrDO

5.3 Storage

Store the sensor with the membrane immersed in a fresh solution of saturated sodium
sulfite. You can use the PVC cap shipped with the sensor. Leave the power to the
transmitter turned on.

Maintenance

Quick Start Guide 19

Maintenance

20 Rosemount 499ATrDO

6 Accessories

Part number Description

23747-06 Interconnecting cable, VP 6, 2.5 ft (0.8 m)

23747-04 Interconnecting cable, VP 6, 4 ft (1.2 m)

23747-02 Interconnecting cable, VP 6, 10 ft (3.0 m)

23747-07 Interconnecting cable, VP 6, 15 ft (4.6 m)

23747-08 Interconnecting cable, VP 6, 20 ft (6.1 m)

23747-09 Interconnecting cable, VP 6, 25 ft (7.6 m)

23747-10 Interconnecting cable, VP 6, 30 ft (9.1 m)

23747-03 Interconnecting cable, VP 6, 50 ft (15.2 m)

23747-11 Interconnecting cable, VP 6, 100 ft (30.5 m)

24091-00 Low flow cell with 1/4 in. OD tubing compression fittings

9390004 Rotameter: 0.5 - 5.0 gph

22550-00 Junction box, 12 terminals

9200266 Extension cable, standard, unprepped

9200275 Extension cable for optimum EMI/RFI cable, unprepped

23747-00 Extension cable for optimum EMI/RFI cable, prepped

23501-04 Trace dissolved oxygen membrane kit: includes 1 membrane assembly and 1

O-ring

25302-04 Trace dissolved oxygen membrane kit: includes 3 membrane assemblies and

3 O-rings

9210264 Dissolved oxygen sensor fill solution, 4 oz (125 mL)

33521-02 Membrane retainer

33523-03 Electrolyte fill plug

9390094 O-ring, Viton 2-014

Accessories

Quick Start Guide 21

Accessories

22 Rosemount 499ATrDO

Accessories

Quick Start Guide 23

www.Emerson.com/RosemountLiquidAnalysis

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LIQ-QSG-499ATrDO

Rev H

2017

MIDDLE EAST AND AFRICA

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