Emerson Rosemount 226 User manual

Reference Manual
00809-0100-3226, Rev AA
August 2018
Rosemount™ 226
Toroidal Conductivity Sensors

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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.
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Contents
Chapter 1 Description and specifications ...................................................................................... 7
1.1 Overview ......................................................................................................................................... 7
1.2 Specifications .................................................................................................................................. 7
1.3 Unpacking and inspection ............................................................................................................... 7
1.4 Ordering information ...................................................................................................................... 8
Chapter 2 Install ........................................................................................................................... 9
2.1 Installing the Sensor ........................................................................................................................ 9
2.2 Wiring the Sensor .......................................................................................................................... 12
Chapter 3 Calibration .................................................................................................................. 17
3.1 Sensor Calibration ......................................................................................................................... 17
3.2 Calibrating against a Standard Solution ......................................................................................... 17
3.3 Calibrating against a Referee – In Process ...................................................................................... 19
3.4 Calibrating against a Referee - Grab Sample .................................................................................. 21
Chapter 4 Troubleshooting ......................................................................................................... 23
4.1 Maintaining the sensor .................................................................................................................. 23
4.2 Troubleshooting ........................................................................................................................... 23
Chapter 5 Accessories ................................................................................................................. 27
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Contents Reference Manual
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1 Description and specifications
1.1 Overview
The Rosemount 226 sensor is a toroidal (inductive) conductivity sensor. These sensors
work well for measuring in highly conductive liquids up to 2 S/cm (2,000,000 μS/cm).
Unlike metal electrode based conductivity sensors, toroidal conductivity sensors, like the
Rosemount 226, are resistant to fouling, coating, and chemical attack.
Sensors are molded with highly corrosion-resistant glass-filled PEEK
(polyetheretherketone). The sensors include an integral Pt-100 RTD for temperature
compensation. With a large bore hole opening, the Rosemount 226 greatly resists
plugging when used in liquids containing high amounts of suspended solids. PEEK is not
recommended for greater than 50% concentrations (at 77 °F (25 °C) ) of H2SO4, HNO3,
and H3PO4. PEEK is not recommended for use with HF at all.
1.2 Specifications
Table 1-1: Rosemount 226 Toroidal Conductivity Sensor Specifications
Description Material and Units
Conductivity Range Refer to transmitter product data sheet
Wetted Materials Glass-filled PEEK, EPDM Gasket
Operating Temperature 32 to 248 °F (0 to 120 °C)
Maximum Pressure 295 psig (2135 kPa [abs])
Cable Length 20 ft. (6.1 m)
Maximum Cable Length Up to 200 ft. maximum
Process Connections 7/8 in. 9 UNC threads for flange mounting and 1
in. MNPT (with -80 option); see dimensional
drawings for more details.
Weight/Shipping Weight 2 lbs/3 lbs (1.0 kg/1.5 kg)
1.3 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.
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They can be used to return the sensor to the factory in case of damage.
1.4 Ordering information
Table 1-2: Rosemount 226 Toroidal Conductivity Sensor ordering information
Model Sensor type
226 Toroidal Conductivity Sensor
Materials of Construction
02 Glass-filled PEEK (1)
Transmitter Compatibility (2)
54 Standard Cable (3)
56 EMI/RFI Shielded Cable (4)
Mounting Kit
80 Submersion (5)
81 Insertion Through User-Supplied Flange (6)
82 No Kit Required (7)
Typical Model Number: 226-02-56-80
(1) The sensor is supplied with an EPDM gasket (a Viton gasket PN 33151-01 is also available; see
accessories).
(2) Cables may be extended using the remote junction box PN 23550-00 (sold separately) and
extension cables (see accessories).
(3) Recommended for use with Rosemount legacy transmitter models 1054 and 2054.
(4) Recommended for use with Rosemount transmitter models 54C, 54eC, 81T, 2081T, 3081T,
4081T, XMT, 56, 1056, 1066, 5081, and 56.
(5) Includes a 1-in. MNPT PEEK adapter
(6) Includes spacer and nut
(7) This option does not include any mounting kit and is for replacement sensors only.
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2 Install
2.1 Installing the Sensor
To ensure accurate readings, it is recommended the sensor be installed so that there is at
least 2.4 inches of clearance between the sensor and tank or pipe walls. If installed too
closely to the walls, an error in readings will be induced by wall effects. Wall effects arise
from the interaction between the current induced in the sample by the sensor and nearby
pipe or vessel walls.
As Figure 2-1 shows, the measured conductivity can either increase or decrease depending
on the wall material. This effect can be seen by watching the conductivity readings change
as the sensor is moved closer to the sides of the pipe, tank, or beaker.
Ensure that the sensor is completely submerged in the process liquid. Mounting the sensor
in a vertical pipe run with flow running from bottom to top is recommended. If the sensor
must be installed in a horizontal pipe run, mount the sensor in the 3 o’clock or 9 o’clock
position.
Figure 2-1: Measured conductivity as a function of clearance between sensor and
walls
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Figure 2-2: Rosemount 226 with 1 in. MNPT process connection mounting adapter
(-80 option) dimensional drawing
Figure 2-3: Rosemount 226 with 7/8 in. 9 UNC thread and insertion through flange
mounting adapter (-81 option) dimensional drawing
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