00825-0100-3225, Rev AA
Rosemount™ 225
Toroidal Conductivity Sensors
Quick Start Guide
May 2020
Quick Start Guide May 2020
Safety information
WARNING
High pressure and temperature hazard
Failure to reduce the pressure and temperature may cause serious injury to personnel.
Before removing the sensor, reduce the process pressure to 0 psig and cool down the process
temperature.
CAUTION
Equipment damage
The wetted sensor materials may not be compatible with process composition and operating
conditions.
Application compatibility is entirely the operator's responsibility.
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
Description and specifications......................................................................................................3
Install........................................................................................................................................... 5
Calibration................................................................................................................................. 15
Maintaining and troubleshooting............................................................................................... 22
Accessories................................................................................................................................ 28
Return of materials.....................................................................................................................29
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May 2020 Quick Start Guide
1 Description and specifications
1.1 Toroidal conductivity sensors
Rosemount 225 Toroidal Conductivity Sensors are intended to be used in
many pharmaceutical and food and beverage applications where a sanitary
design is required. These corrosion and fouling resistant sensors are ideal for
measuring the concentration of CIP solutions, detecting product/water
interfaces, checking product quality, and monitoring eluents in
chromatographic separations.
1.2 Specifications
Cell constant (nominal):
Minimum conductivity:
Maximum conductivity:
Process connection:
Conformance to 3-A
sanitary standards:
Compliance with FDA
food contact
requirements:
Compliance with USP
Class VI:
Standard cable length:
Maximum cable length:
Weight/shipping weight:
2.7/cm
200 µS/cm (15 µS/cm when used with
Rosemount 1056 and 56 transmitters)
2 S/cm
2-in. Tri Clamp
Sensors with option -07 meet 3-A sanitary
standards for sensors and sensor fittings and
connections used on milk and milk products
equipment (74-06).
Sensors with option -07 are molded from
PEEK that meet 21CF177.2415.
Sensors with option -08 are molded from
PEEK that meet USP Class VI requirements
20 ft. (6.1 m)
200 ft. (61 m), up to 100 ft. (30 m) is
standard.
2 lb./3 lb. (1.0 kg/1.5 kg)
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Table 1-1: Maximum Temperature and Pressure
Body
material
option
03 Glass-filled PEEK 230 °F (110 °C) 200 psig (1480
07 Unfilled PEEK (meets
08 Unfilled PEEK (meets
09 Unfilled Tefzel 230 °F (110 °C)
Wetted materials Maximum
temperature
266 °F (130 °C)
21CFR177.2415 and 3A
standard 74-06)
USP Class VI standards)
Maximum
pressure
kpa[abs])
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May 2020 Quick Start Guide
2 Install
2.1 Unpack and inspect
Procedure
1. Inspect the shipping container(s). If there is damage, contact the
shipper immediately for instructions.
2. If there is no apparent damage, unpack the container(s).
3. Ensure that all items shown on the packing list are present.
If items are missing, contact your local Customer Care representative
4. Save the shipping container and packaging.
They can be used to return the instrument to the factory in case of
damage.
2.2 Install the sensor
Prerequisites
1. 2-in. Tri Clamp
2. 2-in. type 1 gasket
3. 2-in. tank ferrule or tee
The sensor may be installed in either a tank or pipe using a customersupplied Tri Clamp and tee assembly. Keep at least 1 in (25 cm) between the
sensor and the pipe wall. If clearance is too small, calibrate the sensor in
place. Ensure that the sensor is completely submerged in liquid.
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Quick Start Guide May 2020
Figure 2-1: Rosemount 225 dimensional drawing
A. Swagelok® connector 316 stainless steel
B. Cap 316 stainless steel
C. Inner diameter
D. Outer diameter
E. Molded housing
Procedure
1. Mount the sensor in the pipe.
2. Mount the sensor in a vertical pipe run with flow from top to bottom.
If the sensor must be mounted in a horizontal pipe run, orient the
sensor in the 3 o'clock or 9 o'clock position.
3. Ensure that the sensor is completely submerged in liquid to the
flange.
2.3
6 Emerson.com/Rosemount
Wire the sensor
Keep sensor wiring away from ac conductors and high current demanding
equipment. Do not cut the cable.
May 2020 Quick Start Guide
NOTICE
For additional wiring information on this product, refer to Emerson.com/
Rosemount-Liquid-Analysis-Wiring.
Figure 2-2: Wire Functions
A. Green: receive
B. Black: receive common
C. White: drive
D. Black: drive common
E. Green: resistance temperature device (RTD) in
F. White: RTD sense
G. Clear: RTD common
H. Clear: shield
I. Black: RTD return
J. Clear: outer shield
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Quick Start Guide May 2020
Figure 2-3: Wiring Diagram Connecting Rosemount 225-54 Sensor to
Rosemount 1056 and 56 Transmitters
A. Clear
B. White
C. Green
D. Black
E. RTD return
F. RTD sense
G. RTD in
H. RTD shield
I. Receive common
J. Receive
K. Receive shield
L. Outer shield
M. Drive shield
N. Drive
O. Drive common
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May 2020 Quick Start Guide
Figure 2-4: Wiring Diagram Connecting Rosemount 225-56 to
Rosemount 1056 and 56 Transmitters
A. Black
B. White
C. Green
D. Clear
E. RTD return
F. RTD sense
G. RTD in
H. RTD shield
I. Receive common
J. Receive
K. Receive shield
L. Outer shield
M. Drive shield
N. Drive
O. Drive common
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Quick Start Guide May 2020
Figure 2-5: Wiring Diagram Connecting Rosemount 225-54 Sensor to
Rosemount 1066 Transmitter
A. RTD return
B. RTD sense
C. RTD in
D. RTD shield
E. Green
F. White
G. Clear
H. Black
I. Receive B
J. Receive A
K. Receive shield
L. Drive B
M. Drive A
N. Drive shield
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May 2020 Quick Start Guide
Figure 2-6: Wiring Diagram Connecting Rosemount 225-56 Sensor to
Rosemount 1066 Transmitter
A. RTD return
B. RTD sense
C. RTD in
D. RTD shield
E. Clear
F. Green
G. White
H. Black
I. Receive B
J. Receive A
K. Receive shield
L. Drive B
M. Drive A
N. Drive shield
O. Clear (not used)
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Figure 2-7: Wiring Diagram for Rosemount 5081 Transmitters
A. Reserved
B. RTD shield
C. RTD common
D. RTD sense
E. RTD in
F. Receive shield
G. Receive common
H. Receive
I. Drive shield
J. Drive common
K. Drive
L. Clear
M. White
N. Green
O. Black
P. Present in high temperature sensor (option -03) only
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May 2020 Quick Start Guide
Figure 2-8: Wiring Sensors through a Remote Junction Box
A. Clear
B. White
C. Green
D. Black
E. Junction box
F. Interconnect cable
Wire sensors point to point. For wiring at the transmitter end, refer to the
appropriate transmitter wiring diagram. For interconnecting cable
23294-00, use the Rosemount 225-54 wiring diagram. For interconnecting
cable 23294-04 and 23294-05, use the Rosemount 225-56 wiring diagram.
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Quick Start Guide May 2020
Figure 2-9: Remote Junction Box (PN 23550-00) Dimensions
A. Drill for 10/32 screw
B. Junction box mounting holes pattern
C. ¾-in. FNPT to sensor
D. ¾-in. FNPT to transmitter
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May 2020 Quick Start Guide
3 Calibration
3.1 Sensor calibration
The nominal cell constant of the Rosemount 225 sensor is 2.7/cm. The error
in cell constant is about ±10%, so conductivity readings made using the
nominal cell constant will have an error of at least ±10%. Wall effects (Figure
3-1), will likely make the error greater.
There are two basic ways to calibrate a toroidal sensor: against a standard
solution or against a referee meter and sensor. A referee meter and sensor is
an instrument that has been previously calibrated and is known to be
accurate and reliable. The referee instrument can be used to perform either
an in-process or a grab sample calibration. Regardless of the calibration
method used, the connected transmitter automatically calculates the cell
constant once the known conductivity is entered.
For more detailed information on calibration methods, reference application
data sheet ADS-43-025 available on the Emerson Liquid Analysis website.
Figure 3-1: Measured Conductivity as a Function of Clearance between
Sensor and Walls
A. Measured conductivity
B. Metal pipe
C. Plastic pipe
D. Distance to wall
E. True conductivity
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3.2 Calibrate against a standard solution
Calibration against a standard solution requires removing the sensor from
process piping. This calibration method is practical only if wall effects are
absent or if the sensor can be calibrated in a container identical to the
process piping. Ideally, the conductivity of the standard used should be close
to the middle of the range that the sensor will be used in. Generally, toroidal
conductivity sensors have good linearity, and so standards greater than
5000 µS/cm at 77 °F (25 °C) may also be used.
Procedure
1. Remove the sensor from the pipe.
2. Fill a container with the standard solution.
If wall effects are absent in the process installation, use a sufficiently
large container for calibration to ensure that wall effects are absent.
To check for wall effects, fill the container with solution and place the
sensor in the center, submerged at least ¾ of the way up the stem.
Note the reading. Then move the sensor small distances from the
center and note the reading in each position. The readings should
not change.
If wall effects are present, be sure the vessel used for calibration has
exactly the same dimensions as the process piping. Also ensure that
the orientation of the sensor with respect to the piping is exactly the
same in the process and calibration vessels (see Figure 3-2).
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May 2020 Quick Start Guide
Figure 3-2: Calibration Installation Orientation
A. Sensor in process piping
B. Flow
C. Blank flange
D. Pipe tee identical to process pipe tee
E. Sensor being calibrated
F. Standard solution
3. Rinse the sensor with water.
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4. Immerse the rinsed sensor in the standard solution.
Use a good quality calibrated thermometer to measure the
temperature of the standard solution. The thermometer error should
be less than ±1 °C. Allow adequate time for the solution and sensor to
reach thermal equilibrium. If the sensor is being calibrated in an open
beaker, keep the thermometer far enough away from the sensor so it
does not introduce wall effects. If the sensor is being calibrated in a
pipe tee or similar vessel, it is impractical to place the thermometer
in the standard solution. Instead, put the thermometer in a beaker of
water placed next to the callibration vessel. Let both come to thermal
equilibrium with the ambient air before continuing calibration (see
Figure 3-3).
Figure 3-3: Measuring Standard Temperature
A. Standard thermometer
B. Standard solution
C. Pipe tee
Be sure air bubbles are not adhering to the sensor. An air bubble
trapped in the toroid opening has a particularly severe effect on the
reading.
5. Turn off automatic temperature compensation in the transmitter.
This eliminates error in the cell constant.
6. Adjust the transmitter reading to match the conductivity of the
standard.
3.3
18 Emerson.com/Rosemount
Calibrate in-process
Prerequisites
If possible, adjust the conductivity of the process liquid so that it is near the
midpoint of the operating range. If this is not possible, adjust the
conductivity so that it is at least 5000 µS/cm.
May 2020 Quick Start Guide
Turn off automatic temperature compensation in the transmitter. This
eliminates error in the cell constant.
Procedure
1. Connect the process and referee sensors in a series.
Keep tubing runs between the sensors short and adjust the sample
flow to as high a rate as possible. Short tubing runs and high flow
ensure that the temperature of the liquid does not change as it flows
from one sensor to another.
2. Allow the process liquid to flow through both sensors.
Orient the referee sensor so that the air bubbles always have an easy
escape path and cannot get trapped. Tap and hold the flow cell in
different positions to allow bubbles to escape.
Wait for readings to stabilize before starting the calibration.
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3. Adjust the process sensor to match the conductivity measured by the
referee instrument (see Figure 3-4).
Figure 3-4: Calibration with a Referee Instrument Example
A. Flow
B. Sensor in process piping
C. Sample valve
D. Referee sensor in flow cell
3.4
20 Emerson.com/Rosemount
Calibrate a grab sample
This method is useful when calibration against a standard is impractical or
when in-process calibration is not feasible, because the sample is hot,
May 2020 Quick Start Guide
corrosive, or dirty, making handling the waste stream from the referee
sensor difficult.
Procedure
1. Take a sample of the process liquid.
a) Take the sample from a point as close to the process sensor as
possible.
b) Be sure the sample is representative of what the sensor is
measuring. If possible, adjust the conductivity of the process
liquid so that it is near the midpoint of the operating range.
c) If that is not possible, adjust the conductivity so that it is at
least 5000 µS/cm.
2. Connect the process and referee sensors.
a) Keep temperature compensation with the transmitter turned
on.
b) Confirm that the temperature measurements in both process
and referee instruments are accurate, ideally to within ±0.5
°C.
3. Place the sensors in the grab sample.
Wait until the readings are stable before starting the calibration.
4. Adjust the reading from the process analyzer to match the
conductivity measured by the referee sensor.
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Quick Start Guide May 2020
4 Maintaining and troubleshooting
4.1 Maintaining the sensor
WARNING
TOXIC LIQUIDS
Be sure the sensor has been cleaned of process liquid before handling.
Generally, the only maintenance required is to keep the opening of the
sensor clear of deposits. Cleaning frequency is best determined by
experience.
4.2 Troubleshoot
4.2.1 Off-scale reading
Potential cause
Wiring is incorrect.
Recommended action
Verify and correct wiring.
Potential cause
Temperature element is open or shorted.
Recommended action
Check temperature element for open or short circuits.
See Figure 4-1 or Figure 4-2.
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May 2020 Quick Start Guide
Figure 4-1: Resistance Check for Rosemount 225-54
Disconnect leads from transmitter before measuring resistances.
A. Receive
B. Drive
C. Resistance temperature device (RTD)
D. Green
E. Black
F. White
G. Clear
Resistance between shield and any other wire: >40 MΩ
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Quick Start Guide May 2020
Figure 4-2: Resistance check for Rosemount 225-56
A. Receive
B. Drive
C. RTD
D. Green
E. Black
F. Clear
G. White
Resistance between shield and any other wire: > 40 MΩ
Potential cause
Sensor is not in process stream.
Recommended action
Submerge sensor completely in process stream.
See Install.
Potential cause
Sensor is damaged.
Recommended action
Perform isolation checks.
See Figure 4-1 or Figure 4-2.
4.2.2 Noisy reading
Potential cause
Sensor is improperly installed in process stream.
24 Emerson.com/Rosemount
May 2020 Quick Start Guide
Recommended action
Submerge sensor completely in process stream.
See Install.
Potential cause
Sensor cable is run near high voltage process stream.
Recommended action
Move cable away from high voltage conductors.
Potential cause
Sensor cable is moving.
Recommended action
Keep sensor cable stationary.
4.2.3 Reading seems wrong (lower or higher than expected)
Potential cause
Bubbles trapped in sensor.
Recommended actions
1. Install the sensor in a vertical pipe run with the flow against the
toroidal opening.
2. Increase flow if possible.
Potential cause
Sensor is not completely submerged in the process stream.
Recommended action
Confirm that the sensor is fully submerged in the process stream.
See Install.
Potential cause
Cell constant is wrong. Wall effects are present.
Recommended action
Calibrate the sensor in place in the process piping.
See Calibration.
Potential cause
Wrong temperature correction algorithm is being used.
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Quick Start Guide May 2020
Recommended action
Check that the temperature correction is appropriate for the sample.
See transmitter Reference Manual for more information.
Potential cause
Temperature reading is inaccurate.
Recommended action
Disconnect the resistance temperature device leads and measure the
resistance between the in and common leads.
See Figure 4-1 or Figure 4-2.
Resistance should be close to the value in Table 4-1.
Table 4-1: Resistance vs. Temperature for Temperature
Compensation (PT-100 RTD)
Temperature Resistance
10 °C (50 °F) 103.9 Ω
20 °C (68 °F) 107.8 Ω
25 °C (77 °F) 109.7 Ω
30 °C (86 °F) 111.7 Ω
40 °C (104 °F) 115.5 Ω
50 °C (122 °F) 119.4 Ω
Potential cause
The temperature response to sudden changes in temperature is slow.
Recommended action
Use a resistance temperature device (RTD) in a metal thermowell for
temperature compensation.
4.2.4 Sluggish response
Potential cause
Sensor is installed in dead area in piping.
Recommended action
Move sensor to a location more representative of the process liquid.
Potential cause
Slow temperature response to sudden changes in temperature.
26 Emerson.com/Rosemount
May 2020 Quick Start Guide
Recommended action
Use a resistance temperature device in a metal thermowell for
temperature compensation.
Quick Start Guide 27
Quick Start Guide May 2020
5 Accessories
Part number Description
23550-00 Remote junction box without preamplifier
23294-00 Unshielded interconnecting cable for Rosemount 1054A,
23294-05 Shielded interconnecting cable with additional shield wire for
9200276 Extension cable, unprepped (specify length) per foot
1054B, and 2054C. Can also be used with Rosemount 1056,
56, 5081, and 1066-T, but not recommended. Prepped,
specify length, per ft.
-03 option. For use with Rosemount 1056, 1066-T, 56, and
5081T. Prepped, specify length, per ft.
28 Emerson.com/Rosemount
May 2020 Quick Start Guide
6 Return of materials
For repair and warranty inquiries, contact Rosemount Customer Care to
obtain a Return Material Authorization (RMA) number.
Note
Drain the sensor and thoroughly rinse it before shipping back to Emerson.
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30 Emerson.com/Rosemount
May 2020 Quick Start Guide
Quick Start Guide 31
GLOBAL HEADQUARTERS
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Shakopee, MN 55379
+1 866 347 3427
+1 952 949 7001
RMTNA.RCCPO@Emerson.com
00825-0100-3225, Rev. AA
Quick Start Guide
May 2020
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2020 Emerson. All rights reserved.
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mark of Emerson Electric Co. Rosemount is a
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