Emerson Rosemount 225 User manual

Reference Manual
00809-0100-3225, Rev AA
August 2018
Rosemount™ 225
Toroidal Conductivity Sensors

2

Safety Information
WARNING
HIGH PRESSURE AND TEMPERATURE HAZARD
Before removing the senosr, reduce the process pressure to 0 psig and cool down the process temperature.
Failure to reduce the pressure and temperature may cause serious injury to personnel.
CAUTION
EQUIPMENT DAMAGE
The wetted sensor materials may not be compatible with process composition and operating conditions. Application
compatibility is entirely your responsibility.
3

4

Contents
Chapter 1 Description and specifications ...................................................................................... 7
1.1 General ........................................................................................................................................... 7
1.2 Unpacking and inspection ............................................................................................................... 7
1.3 Specifications .................................................................................................................................. 8
Chapter 2 Install ......................................................................................................................... 11
2.1 Installing the sensor ...................................................................................................................... 11
2.2 Wiring the Sensor .......................................................................................................................... 12
Chapter 3 Calibration .................................................................................................................. 19
3.1 Sensor calibration ......................................................................................................................... 19
3.2 Calibrating against a Standard Solution ......................................................................................... 19
3.3 Calibrating against a Referee - in-Process ...................................................................................... 21
3.4 Calibrating against a Referee - Grab Sample .................................................................................. 22
Chapter 4 Troubleshooting ......................................................................................................... 25
4.1 Maintaining the sensor .................................................................................................................. 25
4.2 Troubleshooting ........................................................................................................................... 25
Chapter 5 Accessories ................................................................................................................. 29
Chapter 6 Return of Materials ..................................................................................................... 31
Reference Manual Contents
00809-0100-3225 August 2018
Rosemount 225 Sensors 5

Contents Reference Manual
August 2018 00809-0100-3225
6 Reference Manual

1 Description and specifications
1.1 General
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 eleuents in chromatographic separations.
1.2 Unpacking and inspection
Complete the following steps when you unpack your instrument.
Procedure
1. Inspect the shipping container. If there is damage, contact the shipper immediately
for instructions.
2. If there is no apparent damage, unpack the container and remove the sensor.
3. Ensure that all items shown on the packing list are present. If items are missing, If
items are missing, contact your local Customer Care representative
4. Save the shipping container and packaging.
They can be used to return the sensor to the factory in case of damage.
Reference Manual Description and specifications
00809-0100-3225 August 2018
Rosemount 225 Sensors 7

1.3 Specifications
Table 1-1: Specifications
Cell Constant (Nominal) 2.7/cm
Minimum Conductivity 200 µS/cm (15 µS/cm when used with Rosemount 1056 and
56 transmitters)
Maximum Conductivity 2 S/cm
Process Connection 2-inch Tri-Clamp
Conformance to 3-A Sanitary
Standards
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).
Compliance with FDA Food
Contact Requirements
Sensors with option -07 are molded from PEEK that meet
21CFR177.2415.
Compliance with USP Class VI Sensors with option -08 are molded from PEEK that meet USP
Class VI requirements.
Cable Length 20 ft (6.1 m)
Maximum Cable Length 200 ft (61 m)
Weight/Shipping Weight 2 lb/3 lb (1.0 kg/1.5 kg)
Table 1-2: Options
Body Material Option Wetted Materials Maximum
Temperature
Maximum Pressure
03 Glass-filled PEEK 230 °F (110 °C) 200 psig (1480 kpa
[abs])
07 Unfilled PEEK (meets
21CFR177.2415 and
3A standard 74-06)
266 °F (130 °C)
08 Unfilled PEEK (meets
USP VI standards)
09 Unfilled Tefzel 230 °F (110 °C)
Table 1-3: Rosemount 225 Sanitary Toroidal Conductivity Sensor Ordering
Information
Model Sensor Type
225 Toroidal Conductivity Sensor
Body Material & Mounting Type
03 Glass-filled PEEK with tri-clamp
07 Unfilled PEEK with tri-clamp
08 USP Class VI unfilled PEEK with tri-clamp (1)
09 Unfilled Tefzel (2)
Description and specifications Reference Manual
August 2018 00809-0100-3225
8 Reference Manual

Table 1-3: Rosemount 225 Sanitary Toroidal Conductivity Sensor Ordering
Information (continued)
Transmitter Compatibility
54 Standard integral cable
56 Integral cable with additional shielding for
improved EMI/RFI protection (3)
Typical model number: 225-03-56
(1) Only available with -56 option.
(2) Only available with -56 option.
(3) Recommended for use with Rosemount transmitter models 56, 1056, 5081, and 1066
Reference Manual Description and specifications
00809-0100-3225 August 2018
Rosemount 225 Sensors 9

Description and specifications Reference Manual
August 2018 00809-0100-3225
10 Reference Manual

2 Install
2.1 Installing the sensor
Prerequisites
1. 2 inch Tri-Clamp
2. 2 inch type 1 gasket
3. 2 inch tank ferrule or tee
About this task
The sensor may be installed in either a tank or pipe using a customer-supplied 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.
Figure 2-1: Rosemount 225 dimensional drawing
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.
Reference Manual Install
00809-0100-3225 August 2018
Rosemount 225 Sensors 11

2.2 Wiring the Sensor
Keep sensor wiring away from ac conductors and high current demanding equipment. Do
not cut the cable.
NOTICE
For additional wiring information on this product, please refer to the Liquid Transmitter
Wiring Diagrams.
Figure 2-2: Wire functions
Install Reference Manual
August 2018 00809-0100-3225
12 Reference Manual

Figure 2-3: Wiring diagram for Rosemount 1056 and 56 Transmitters
Reference Manual Install
00809-0100-3225 August 2018
Rosemount 225 Sensors 13

Figure 2-4: Wiring diagram for Rosemount 1066 Transmitters
Install Reference Manual
August 2018 00809-0100-3225
14 Reference Manual

Reference Manual Install
00809-0100-3225 August 2018
Rosemount 225 Sensors 15

Figure 2-5: Wiring diagram for Rosemount 5081 Transmitters
Install Reference Manual
August 2018 00809-0100-3225
16 Reference Manual

Figure 2-6: Wiring sensors through a remote junction box
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 225-54 wiring
diagram. For interconnecting cable 23294-04 and 23294-05, use the 225-54 wiring
diagram.
Figure 2-7: Remote Junction Box (PN 23550-00) dimensions
Reference Manual Install
00809-0100-3225 August 2018
Rosemount 225 Sensors 17

Install Reference Manual
August 2018 00809-0100-3225
18 Reference Manual

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 the using the nominal cell constant
will have an error of at least ±10%. Wall effects,as shown in 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 calbiration method used, the connected transmitter automatically
calculates the cell constant once the known conductivity is entered.
For more detailed information on calibration methods, please 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
3.2 Calibrating 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.
Reference Manual Calibration
00809-0100-3225 August 2018
Rosemount 225 Sensors 19

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 3/4
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.
Figure 3-2: Calibration installation orientation
3. Rinse the sensor with water.
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.
Calibration Reference Manual
August 2018 00809-0100-3225
20 Reference Manual