Emerson Rosemount 226 Quick Start Guide

00825-0100-3226, Rev AA

Rosemount™ 226

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........................................................................................................................................... 4

Calibration................................................................................................................................. 14

Maintaining and troubleshooting............................................................................................... 19

Accessories................................................................................................................................ 24

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May 2020 Quick Start Guide

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 percent
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])

Standard cable length 20 ft. (6.1 m)

Maximum cable length 200 ft. (61 m)

Process connections ⅞-in. 9 UNC threads for flange mounting

Weight/shipping weight 2 lb./3 lb. (1.0 kg/1.5 kg)

and 1-in. MNPT (with -80 option); see

Dimensional drawings for more details.

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Quick Start Guide May 2020

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 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.

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May 2020 Quick Start Guide

Figure 2-1: Measured Conductivity as a Function of Clearance between
Sensor and Walls

A. Measured conductivity
B. Metal pipe
C. True conductivity

D. Plastic pipe

E. Distance to wall

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Quick Start Guide May 2020

Figure 2-2: Rosemount 226 with 1-in. MNPT Process Connection
Mounting Adapter (-80 option) Dimensional Drawing

A. Boot
B. 20-ft. (6.1 m) cable
C. Adapter, PEEK, PN 33185-01 (included with code 80)

D. EPDM gasket

E. Wrench opening
F. One piece molded housing, PEEK

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Figure 2-3: Rosemount 226 with ⅞-in. 9 UNC Thread and Insertion
through Flange Mounting Adapter (-81 option) Dimensional Drawing

A. Steel flange
B. Gasket
C. EPDM gaskets

D. One piece molded housing, PEEK

E. Welding neck steel flange

F. PEEK flange spacer 1-in. long
G. 304 stainless steel adapter for conduit
H. Boot

I. 20-ft. (6.1 m) cable

2.2.1 Submersion mounting

The sensor must be mounted in conduit or stand pipe to protect the back
end from process leakage. Use PTFE tape for a good seal.

2.2.2 Insertion Mounting

The sensor is designed to be mounted through any user-supplied flange. The
user is responsible for cutting a hole through the flange to fit the sensor. The
flange may be drilled and tapped for the sensor’s ⅞-in. 9 UNC thread.
Alternatively, a simple 15/16-in. (2.4 cm) drilled hole will accommodate the
⅞-in. 9 UNC thread.

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2.2.3 Sensor cable precautions

CAUTION

ELECTRICAL HAZARD

Cables run in the same conduit with power wiring or near heavy electrical
equipment may cause measurement errors and damage the sensor.

Do not run sensor cable in same conduit as the AC power wiring or near
heavy electrical equipment.

CAUTION

MOISTURE DAMAGE

Failure to properly seal the conduit may allow accumulated moisture in the
transmitter housing and damage the sensor and the transmitter.

Sensor cables routed in conduit must be sealed or plugged with sealing
compound.

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May 2020 Quick Start Guide

2.3 Wire the sensor

For additional wiring information on this product, including sensor
combinations not shown here, please refer to Emerson.com/Rosemount-

Liquid-Analysis-Wiring.

Figure 2-4: 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 common
J. Clear

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