How it Works
Emerson
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Rosemount 326L
Quick Start Guide
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Emerson Rosemount 326L Quick Start Guide

Quick Start Guide
00825-0100-4326, Rev 02
August 2020
Rosemount™ 326L Level Transmitter
Quick Start Guide August 2020
Contents
Introduction.................................................................................................................................3
Installation................................................................................................................................. 11
Operation...................................................................................................................................25
Troubleshooting and maintenance.............................................................................................44
Setting ranges............................................................................................................................47
Product certifications................................................................................................................. 48
Factory settings..........................................................................................................................49
August 2020 Quick Start Guide

1 Introduction

The level transmitter continuously detects level of a media and reports the level of the media in multiple selectable units of measurements and values.

1.1 Safety instructions

Follow these safety guidelines when installing and using the level transmitter.
CAUTION
• Read this document before installing the level transmitter and keep it for
the life of the level transmitter.
• The level transmitter must be suitable for the corresponding applications
and environmental conditions without any restrictions.
• Use the level transmitter only for its intended purpose.
• Use the level transmitter only with permissible media.
• If you do not adhere to the operating instructions and technical data,
personal injury and/or damage to property might occur.
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of
the product must be performed by qualified personnel authorized by the machine operator.
• Protect units and cables against damage.
1.2
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Applications

The level transmitter is intended to be used in food and beverage applications or applications with significant hygienic requirements.
The level transmitter complies with the standard EN 61000-6-4 and is a class A product. The level transmitter may cause radio interference in domestic areas. If interference occurs, the user must take appropriate actions.
Note
The level transmitter emits less microwave energy than mobile phones. The operation of the level transmitter is harmless to human health if used as intended.
Quick Start Guide August 2020

1.2.1 Application area restrictions

Measurements made by the level transmitter can be impacted by the environment and the type of media it is measuring.
The following media characteristics can cause incorrect measurements:
• Highly absorbing surfaces (foam)
• Intensely bubbling surfaces
• Media which are very inhomogeneous, separate from each other thus
forming separation layers (oil layer on water)
To prevent this, follow these guidelines:
• Check the function by performing an application test.
• Install the level transmitter in a steady environment.
In case of signal loss, the level transmitter displays SEnS and switches the outputs to a defined state. See Output response in different operating states for more information.
The level transmitter is not suitable for:
• Bulk materials like plastic granulates and media with a very low dielectric
constant like oils.
• Applications where the probe is subjected to permanent and high
mechanical stress. For example, fast moving viscous medium or fast flowing medium.
Use the level transmitter preferably with metal tanks. When used with plastic tanks, deterioration caused by electromagnetic interference might occur (noise immunity to EN61000-6-2).
August 2020 Quick Start Guide

1.3 Measuring principle

The level transmitter uses guided wave radar to measure media level. It emits electromagnetic pulses every nanosecond to measure the level.
Figure 1-1: Transmitting Pulses
Figure 1-2: Receiving Pulses
The transmitter head transmits pulses that are guided along the probe towards the media (Figure 1-2). When the pulses hit the media they are reflected and guided back to the transmitter (Figure 1-2). The time between transmitting and receiving the pulse determines the traveled distance (D) and the current level. The reference for distance measurement is the lower edge of the process connection.

1.3.1 Probes for different tank heights

The height of the probe must be adjusted to accommodate the height of the tank. Probes at different heights are available to order. The minimum probe
Quick Start Guide August 2020
length is 1.18 in. (150 mm). The maximum probe length is 78.74 in. (2000 mm).

1.4 Outputs

The level transmitter generates output signals based on the output parameter settings. Two outputs are available and they can be set separately.
OUT1
OUT1 provides a switching signal for level limit or IO-Link communication. See IO-Link for more information.
OUT2
OUT2 can perform one of these functions:
• An analog signal proportional to the level 4 - 20 mA or 20 - 4 mA
• Switching signal for level limit

1.4.1 Fault states

Defined states for each output prepare the output for fault conditions. If the level transmitter detects a fault or if the signal quality is below a minimum value, the transmitter outputs change to the defined fault state.
Use FOU1 and FOU2 to configure fault states for the respective outputs. Fault states for the analog output follow Namur recommendation (NE43). For more information, see Set response of the outputs in case of fault.
Setting a delay time prevents the level transmitter from erroneously falling into a fault state. For more information, see Set delay time in case of a fault. During the delay time, the level transmitter retains the last measured value. If the measured signal is received again in sufficient strength within the delay time, the unit continues to work in normal operation. If it is not received again in sufficient strength within the delay time, the outputs change to the defined state.
Note
In case of heavy foam build-up or turbulence, create a steady environment for the level transmitter. For more information, see Minimum distances and
connection piece diameter.
1.5

IO-Link

The level transmitter has an IO-Link communication interface which requires an IO-Link-capable module (IO-Link master) for operation.
The IO-Link interface enables direct access to the process and diagnostic data and provides the possibility to set the parameters of the unit during operation.
August 2020 Quick Start Guide
Point-to-point connection is possible with a USB adapter cable.
Detailed information about process data structure (IODDs) necessary for the configuration of the level transmitter, diagnostic information, parameter addresses, and the necessary information about the required IO-Link hardware and software can be found at Emerson.com/Rosemount.

1.6 Functions

The level transmitter performs the functions detailed in this section.

1.6.1 Display functions

The level transmitter displays the current level, either in millimeters, inches, or percentage of the scaled measuring range. The default factory setting is inches.
For more information on changing the displayed unit of measurement, see
Configure the display.
In the operating mode, you can switch between length display (mm, inch) and percentage. For more information, see Change display between length
and percentage.
The LEDs indicate the set unit of measurement and the switching status of the outputs. For more information, see Display elements.

1.6.2 Analog signal

The level transmitter can provide an analog signal proportional to level.
The parameter ou2 defines the output function for the analog output:
• 4-20 mA (ou2 = I)
• 20-4 mA (ou2 = InEG)
For more information, see Set output function for OUT2.
The analog start point ASP2 defines the measured value at which the analog start value is provided. The analog start value is 4 mA with ou2 = I or 20 mA with ou2 = InEG. For more information, see Scale analog signal.
The analog end point AEP2 defines the measured value at which the analog end value is provided. The analog end value is 20 mA with ou2 = I or 4 mA with ou2 = InEG. For more information, see Scale analog signal.
The minimum distance between ASP2 and AEP2 is 20 percent of the active zone.
Figure 1-3: Analog signal
The default factory curve of the analog signal:
A scaled measuring range curve of the analog signal:
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L: Level A: Active zone = L - (I1 + I2) I1: Inactive zone 1 I2: Inactive zone 2
For more information about the analog output, see Output response in
different operating states.
Take note of the tolerances and accuracy limits during the evaluation of the analog signal. For more information, see the Product Data Sheet.

1.6.3 Switching functions

When using a switching output (OUT1 or OUT2), the level transmitter indicates when the level reaches a set limit or that the level is below the limit.
Select one of the following switching functions for the outputs:
• Hysteresis function/normally open: oux = Hno
• Hysteresis function/normally closed: oux = Hnc
Note
When configuring a switching function, set the set point (SPx) first, then set the reset point (rPx) with the requested difference.
• Window function/normally open: oux = Fno
• Window function/normally closed: oux = Fnc
1: ou2 = I (factory setting) 2: ou2 = InEG ASP2: Analog start point AEP2: Analog end point
Note
The difference between FHx and FLx sets the width of the window. FHx is the upper value and FLx is the lower value.
August 2020 Quick Start Guide
Figure 1-4: Switching function
Hysteresis function Window function
L: Level
HY: Hysteresis
FE: Window
• The adjustable limits (SP and rP) always refer to the lower edge of the
probe.
• The maximum switch-on and switch-off delay for the switching output is
60 seconds. For more information, see Set switch-on delay for switching
outputs and Set switch off delay for switching outputs.

1.6.4 Damping function

If the medium conditions are unsteady, dampen the transmitter response. The level transmitter uses a filter to smooth the values into a steady curve when the display and output response is dampened.
You can configure the damping using dAP. For more information, see Set
damping for measured signal.
In the event of a sudden jump in level, dAP indicates the time in seconds for the output to reach 63 percent of the final value. After five times dAP, the output should reach 100 percent of the final value.

1.6.5 Simulation functions

To assist in maintenance, reducing interference, or setting up the level transmitter, simulate error scenarios and levels.
The duration of a simulation can be between one minute and one hour. The simulation is started manually and runs until the set duration elapses. During
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the simulation, the outputs respond according to the simulated process values. For more information, see Simulation.
August 2020 Quick Start Guide

2 Installation

This section includes instructions for installing and wiring the level transmitter.
These procedures are required to setup the level transmitter:
1. Installing the level transmitter
2. Wire the transmitter
3. Adjust the probe length
To modify the factory default settings, perform these procedures.
• Set parameters
• Perform a tank adjustment
• Change basic settings
To view the factory default settings, see Factory settings. Test that the level transmitter is working correctly before using.

2.1 Installation considerations

Follow these installation guidelines to ensure more effective operation of the level transmitter.
• For more effective level measurement, install the level transmitter
vertically on the top of the tank or pipe.
• To reduce signal interference, perform a tank adjustment (see Tank
adjustment).
• For more effective level measurement, install the level transmitter in
closed, metal tanks or bypass pipes.
— For installation instructions for open tanks, see Installing in an open
tank.
— For installation instructions for plastic containers, see Installing in a
plastic tank.

2.1.1 Minimum distances and connection piece diameter

For more effective operation, follow these guidelines for the connection piece diameter and the distances between the level transmitter and the tank.
Select a connection piece height that is smaller than the connection piece diameter.
Quick Start Guide August 2020
Installation distances with adjustment A1: 0.39 in (10 mm) A2: 0.79 in (20 mm) A3: 0.79 in (20 mm) to tank structures
(B) 1.97 in (50 mm) to other transmitters type LR
D: ø 1.18 in (30 mm) if installed in a connection piece

2.1.2 Installation in pipes

If installing the level transmitter in a pipe, the conditions must meet these requirements.
• Hygienic requirements
• Install only in metal pipes
• The internal diameter of the pipe (d) must meet these requirements:
With adjustment
d ø 1.18 in (30 mm) ø 3.94 in (100 mm) with [MEdI]
Installation distances without adjustment
A1: 0.39 in (10 mm) A2: 1.97 in (50 mm) A3: 1.97 in (50 mm) to tank structures
(B) 1.97 in (50 mm) to other transmitters type LR
D: No connection piece allowed (see above image)
Without adjustment
= [HIGH] ø 7.87 in (250 mm) with [MEdI]
= [MId] For more information, see Set
to another medium.
August 2020 Quick Start Guide
Note
Using a centering piece can prevent damage caused by turbulent media by stabilizing the probe.

2.1.3 Applications with viscous or fast-flowing media

The installation of the level transmitter must meet the following requirements if installed in conditions with viscous or fast-flowing media and/or agitators.
• The probe cannot contact the tank walls or structures.
• Expect an increase in the minimum lateral distances according to probe
length and the lateral deflection.
• If possible, use a sleeve or a similar device to fix the probe at the lower
end so that it is electrically conductive. See Figure 2-1
Figure 2-1: Installation with Viscous or Fast-Flowing Media
• Ensure the correct function is set. (Especially in use with an empty tank)

2.1.4 Fill openings

Do not install the level transmitter near or in contact with a fill opening.
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2.1.5 Highly polluted medium

If the medium is highly polluted, there is a risk that a bridge forms between the probe and the tank wall or structures in the tank.
To avoid this, increase minimum distance between the probe and the tank walls depending on the pollution intensity.

2.1.6 Heavy foam build-up and turbulence

Heavy foam build-up or turbulence in the tank might cause incorrect measurements.
To avoid this, install the transmitter in a steady area that meets hygienic requirements.
Examples of how to create a steady environment include:
• Install the level transmitter in a metal bypass or a metal still pipe.
• Separate the level transmitter location with metal sheets or perforated
sheets.
Figure 2-2: Installing in foam build-up and turbulence
d: Minimum diameter (See Installation in pipes)
Note
The upper access to the steady area (A, B) must be above the maximum level. The lower access (C, D) or the area with perforated sheet must be below the minimum level. This ensures that neither foam nor turbulence impact the transmitter zone. To avoid interference from solids in the medium, use perforated sheets or something similar.
August 2020 Quick Start Guide
Note
With increased foam build-up set the medium parameter [MEdI] to [MId]. For instructions, see Set to another medium.

2.1.7 Tank adjustment

Tank adjustment reduces interference and ensures a higher excess gain in difficult application conditions.
CAUTION
Perform a tank adjustment only after installing the level transmitter.
• When performing a tank adjustment, enter an adjustment distance first.
Starting from the process connection, use the adjustment distance to compensate for interfering reflections.
• Select an adjustment distance (a) so the level transmitter can detect the
connection piece (S) and structures in the tank (B).
• Observe safety distance (b ≥ 9.84 in (250 mm)) to the level or the probe
end.
a: Minimum adjustment distance is 0.39 in (10 mm); maximum is L - 9.84 in (250 mm)
b: Safety distance to the level or probe end: b ≥ 9.84 in (250 mm)
S: Connection piece
B: Structures in the tank
• For probe lengths L < 10.24 in (260 mm), tank adjustment is not
possible. tREF is then not available. In this case, adhere to all installation distances in Installation considerations.
Quick Start Guide August 2020
• If the installation meets all distance guidelines, a tank adjustment is not
necessary.
• If possible, perform the tank adjustment on an empty tank to detect any
possible sources of interference. In this case, select the maximum adjustment distance (L - 9.84 in or L - 250 mm).
• Tank adjustment information is not saved with IO-Link. After a
replacement, perform a tank adjustment again. For more information on data storage, see Unit locking and data storage.

2.2 Installing the level transmitter

Follow these instructions to install the level transmitter.

2.2.1 Adjust the probe length

If needed, modify the standard probe length to accommodate the height of the tank.
Note
• The level transmitter does not support probe lengths less than 5.91 in
(150 mm).
• Tank adjustment is not possible with probe lengths of less than 10.24 in
(260 mm). For more information, see Tank adjustment.
Procedure
1. Screw the probe to the level transmitter.
2. Mark the desired length (L) on the probe. The reference point is the lower edge of the process connection.
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