Rosemount 499ATrDO Trace Dissolved Oxygen Sensor Quick Start Guide

00825-0100-3493, Rev AB

Rosemount™ 499ATrDO

Trace Dissolved Oxygen Sensor

Quick Start Guide

November 2019

Quick Start Guide November 2019

Safety information

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

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)

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.

Contents

First steps.....................................................................................................................................3

Install........................................................................................................................................... 6

Wire............................................................................................................................................. 8

Calibrate.................................................................................................................................... 13

Maintenance.............................................................................................................................. 15

Accessories................................................................................................................................ 18

2 Emerson.com/Rosemount

November 2019 Quick Start Guide

1 First steps

1.1 Unpack and inspect

Procedure

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

2. 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 Emerson immediately.

1.2 Product description

Figure 1-1: Rosemount 499ATrDO Sensor Parts

A. Membrane retainer
B. Membrane assembly
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

Table 1-1: Sensor Specifications

Physical characteristics Specifications

Range 0.1 ppb to 20 ppm

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

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

Process connection 1-in. male national pipe thread (MNPT)

Quick Start Guide 3

Specifications

Quick Start Guide November 2019

Table 1-1: Sensor Specifications (continued)

Physical characteristics Specifications

Wetted parts Noryl®, Viton®, EPDM, Teflon® , and silicone

Cathode Gold (not normally wetted)

Accuracy Accuracy depends on the accuracy of the chemical test used to

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 77 °F (25 °C) (0 to 200 ppb

Membrane permeability
connection

Electrolyte volume 0.8 oz. (25 mL), approximately

Electrolyte life 4 to 6 months (approximately)

Sensor life 2 years (approximately)

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

Cable length See Ordering information table in the Product Data Sheet for cable

Cable length (maximum) 300 ft. (91 m), up to 100 ft. (30.5 m) is standard.

Drift <4% over 60 days

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

Comedown time to 1 ppb New sensor: < 5 hours

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

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

calibrate the sensor.

oxygen)

Defined between 32 and 122 °F (0 and 50 °C)

<20 ppb: ±1 ppb
>20 ppb: ±5% of reading

length options.

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.

Following membrane change: < 1 hour
Following air calibration: < 1 hour

used. The comedown time will be longer.

4 Emerson.com/Rosemount

November 2019 Quick Start Guide

Table 1-2: Other Specifications

Type PN Wetted

materials

Low flow

(1)

cell

24091-00 and
24091-01

Polycarbon­ate/
polyester,
316 stainless
steel, and
silicone

Process
connection

Compression
fitting for
¼-in. O.D.
tubing or
¼-in. female
national pipe

Maximum
temperature

Maximum
pressure

158 °F (70 °C) 90 psig

(722 kPa abs)

thread (FNPT)

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

pressure specifications for the sensor.

Quick Start Guide 5

Quick Start Guide November 2019

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!

Figure 2-1: Sensor Orientation

Install sensor within 45 degrees of vertical.

6 Emerson.com/Rosemount

November 2019 Quick Start Guide

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

A. Inches
B. Millimeters
C. Outlet

D. Inlet

Quick Start Guide 7

Quick Start Guide November 2019

3 Wire

NOTICE

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

Diagrams.

Figure 3-1: Rosemount 499ATrDO Sensor Wiring to Rosemount 1056
and 56 Transmitters

Table 3-1: Rosemount 499ATrDO Sensor Wiring to Rosemount 1056 and 56
Transmitters

Terminal
number

1 A White Resistance temperature

2 B White/red RTD sense

3 C Red RTD in

4 D Clear RTD shield

5 N/A N/A +5 V out

6 N/A N/A -4.5 V out

7 D Clear Anode shield

8 E Gray Anode

9 D Clear Cathode shield

8 Emerson.com/Rosemount

Letter Wire color Description

device (RTD) return

November 2019 Quick Start Guide

Table 3-1: Rosemount 499ATrDO Sensor Wiring to Rosemount 1056 and 56
Transmitters (continued)

Terminal
number

10 F Orange Cathode

Letter Wire color Description

Figure 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081
Transmitter

Table 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081 Transmitter

Terminal
number

1 N/A N/A N/A

2 N/A N/A +0.8 V

3 A White RTD return

Quick Start Guide 9

Letter Wire color Description

Quick Start Guide November 2019

Table 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081 Transmitter

(continued)

Terminal
number

4 B White/red RTD sense

5 C Red RTD in

6 N/A N/A Reference guard

7 N/A N/A Reference in

8 D Clear Solution ground

9 N/A N/A pH guard

10 N/A N/A pH in

11 N/A N/A -5 V

12 N/A N/A +5 V

13 E Gray Anode

14 F Orange Cathode

15 N/A N/A HART®/FOUNDATION™ Fieldbus

16 N/A N/A HART/FOUNDATION Fieldbus (+)

Letter Wire color Description

(-)

10 Emerson.com/Rosemount

November 2019 Quick Start Guide

Figure 3-3: Rosemount 499ATrDO Sensor Wiring to Rosemount 1066
Transmitter

Note

Connect clear shield wires to solution ground terminal on TB 2. Use wire nut
and pigtail if necessary.

Table 3-3: Rosemount 499ATrDO Wiring to Rosemount 1066
Transmitter

Letter Color Terminal description

A Orange Cathode

B Gray Anode

C White Return

D White/red Sense

E Red RTD in

Quick Start Guide 11

Quick Start Guide November 2019

Figure 3-4: Rosemount 499ATrDO Sensor Pin-out Diagram

Table 3-4: Pin-out Diagram

Terminal number Description

1 Cathode

2 N/A

3 RTD sense

4 Anode

5 RTD return

6 RTD in

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.

12 Emerson.com/Rosemount

November 2019 Quick Start Guide

4 Calibrate

4.1 Zero point calibration

Even in the absence of oxygen, the 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.

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

Quick Start Guide 13

Full scale

The best way to calibrate the sensor is to expose it to to water-saturated air.

Procedure

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

2. Suspend the sensor, keeping the membrane dry, about ¼-in. (6 mm)
above the surface of the water.

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

The transmitter 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 November 2019

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 solution.

14 Emerson.com/Rosemount

November 2019 Quick Start Guide

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 two percent, 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

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 the instructions.

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 15

Quick Start Guide November 2019

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 degree 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

A sharp probe may puncture the bladder and destroy the sensor.

Do not use a sharp probe.

16 Emerson.com/Rosemount

November 2019 Quick Start Guide

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.

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.

Quick Start Guide 17

Quick Start Guide November 2019

6 Accessories

Part number Description

23747-06 Interconnecting cable, Variopol (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 ¼-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

25302-04 Trace dissolved oxygen membrane kit: includes 3

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

membrane assembly and 1 O-ring

membrane assemblies and 3 O-rings

18 Emerson.com/Rosemount

November 2019 Quick Start Guide

Quick Start Guide 19

GLOBAL HEADQUARTERS

6021 Innovation Blvd.
Shakopee, MN 55379

[phone]
[phone]
[e-mail]

*00825-0100-3493*

Quick Start Guide

00825-0100-3493, Rev. AB

November 2019

NORTH AMERICA

Emerson Automation Solutions
8200 Market Blvd
Chanhassen, MN 55317

Toll Free [phone]
F [phone]
[e-mail]

MIDDLE EAST AND AFRICA

Emerson Automation Solutions
Emerson FZE
Jebel Ali Free Zone
Dubai, United Arab Emirates, P.O. Box
17033

[phone]
[phone]
[e-mail]

Linkedin.com/company/Emerson-

Automation-Solutions

twitter.com/rosemount_news

Facebook.com/Rosemount

youtube.com/RosemountMeasurement

EUROPE

Emerson Automation Solutions
Neuhofstrasse 19a PO Box 1046
CH-6340 Baar
Switzerland

[phone]
[phone]
[e-mail]

ASIA-PACIFIC

Emerson Automation Solutions
1 Pandan Crescent
Singapore 128461
Republic of Singapore

[phone]
[phone]
[e-mail]

©

2019 Emerson. All rights reserved.

The Emerson logo is a trademark and service
mark of Emerson Electric Co. Rosemount is a
mark of one of the Emerson family of companies.
All other marks are the property of their
respective owners.