Emerson Rosemount 499ATrDO User manual

Quick Start Guide
00825-0100-3493, Rev AB
November 2019
Rosemount™ 499ATrDO
Trace Dissolved Oxygen Sensor

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
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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 Specifications
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)
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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
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 77 °F (25 °C) (0 to 200 ppb
oxygen)
Membrane permeability
connection
Defined between 32 and 122 °F (0 and 50 °C)
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
<20 ppb: ±1 ppb
>20 ppb: ±5% of reading
Cable length See Ordering information table in the Product Data Sheet for cable
length options.
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
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.
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. (0.5 kg/1.5 kg)
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Table 1-2: Other Specifications
Type PN Wetted
materials
Process
connection
Maximum
temperature
Maximum
pressure
Low flow
cell (1)
24091-00 and
24091-01
Polycarbon-
ate/
polyester,
316 stainless
steel, and
silicone
Compression
fitting for
¼-in. O.D.
tubing or
¼-in. female
national pipe
thread (FNPT)
158 °F (70 °C) 90 psig
(722 kPa abs)
(1) Temperature and pressure specifications for the low flow cell exceed the temperature and
pressure specifications for the sensor.
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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.
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Figure 2-2: Low Flow Cell (PN 24091-00)
A. Inches
B. Millimeters
C. Outlet
D. Inlet
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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
Letter Wire color Description
1 A White Resistance temperature
device (RTD) return
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
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Table 3-1: Rosemount 499ATrDO Sensor Wiring to Rosemount 1056 and 56
Transmitters (continued)
Terminal
number
Letter Wire color Description
10 F Orange Cathode
Figure 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081
Transmitter
Table 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081 Transmitter
Terminal
number
Letter Wire color Description
1 N/A N/A N/A
2 N/A N/A +0.8 V
3 A White RTD return
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Table 3-2: Rosemount 499ATrDO Sensor Wiring to Rosemount 5081 Transmitter
(continued)
Terminal
number
Letter Wire color Description
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 (+)
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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
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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.
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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 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.
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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.
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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.
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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.
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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.
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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
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
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*00825-0100-3493*
Quick Start Guide
00825-0100-3493, Rev. AB
November 2019
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