Emerson Fisher FIELDVUE L2t User manual

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

www.Fisher.com

Fisher™FIELDVUE™L2t Liquid Level Controller

This manual applies to

Device Type 0x1314

Device Revision 1

Firmware Revision 3

DD Revision 1

Contents

Introduction 2.................................

Scope of Manual 2.............................

Description 2.................................

Specifications 2...............................

Educational Services 2.........................

Security 6.....................................

Installation 7..................................

Attaching a Vertical Displacer 7..................

Attaching a Horizontal Displacer 7...............

Attaching the Sensor to the Vessel 8.............

Electrical Connections 9........................

Seal Certification 11........................

Calibration 12..................................

Zero Adjustment 14...........................

Configuration 14...............................

Alert Setup 21................................

Principle of Operation 23........................

Maintenance 24................................

Replacing the Complete Controller Assembly 24...

Product Disposal Guidelines 26..................

Figure 1. FIELDVUE L2t Liquid Level Controller

X1988

MAIN

HOUSING

SENSOR

TRANSMITTER

LOCK MOUNT

HOLES

Scan or click code for

Installation Documents

& Field Support

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Introduction

Scope of Manual

This instruction manual includes specifications, installation, basic setup

and configuration, and maintenance and troubleshooting information for

the Fisher FIELDVUE L2t liquid level controller.

This manual describes using the local interface or an Emerson handheld

communicator, such as the AMS Trex Device Communicator, to setup and

calibrate the instrument.

Do not install, operate, or maintain a FIELDVUE L2t liquid level controller without being fully trained

and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid

personal injury or property damage, it is important to carefully read, understand, and follow all of the

contents of this manual, including all safety cautions and warnings. If you have any questions about

these instructions, contact your Emerson sales office before proceeding.

Description

The FIELDVUE L2t liquid level controller comes as a package that includes sensor, main housing, and transmitter. The

package is pre-calibrated and can be mounted onto a vessel using the 2 NPT connection.

The rugged L2t liquid level controller use a displacer type sensor (see figure 1) to detect liquid or the interface of two

liquids of different specific gravities.

These controllers use an electrical 4-20 signal to provide applicable control and action. The device delivers an

electrical signal to a control/dump valve.

Unless otherwise noted, all NACE references are to NACE MR0175-2002.

Specifications

Specifications for the Lt2 are shown in table 1 and 2.

WARNING

This product is intended for a specific current range, temperature range and other application specifications. Applying

different current, temperature and other service conditions may result in personal injury, property damage or malfunction

of the product.

Educational Services

Emerson Educational Services

Phone: +1-800-338-8158

E-mail: [email protected]

emerson.com/mytraining

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Table 1. Specifications - Housing and Sensor

Available Configuration

Sensor: Displacer‐type liquid level sensor for mounting

to side of tank. Displacer travel is transmitted to

controller by pivotal movement of displacer rod

Input Signal

Type: Liquid level or liquid‐to‐liquid interface

Level change required for full change in output signal

in a 1.0 specific gravity liquid with either vertical

displacer with standard lever arm length

Default: 71 mm (2.8 inches), user configurable if

other range desired

Minimum Span Level Change

102 mm (4 inches)(1)

Maximum Span Level Change

305 mm (12 inches)(1)

Minimum Specific Gravity(2)

0.4

Output Signal

4-20 mA and two discrete switches

Reverse acting via configuration or calibration

Sensor to Vessel Connection

J2 NPT threaded or JNPS 2 CL150 through 1500

slip‐on flange connection(3)

Controller Connection

Case Vent: 1/4 NPT internal with vent screen

assembly located on the back of the case

Displacer Size

J48 x 305 mm, 541 cm3(1-7/8 x 12 inches, 33 in3)

(Standard) or J70 x 203 mm, 778 cm3(2-3/4 x 8

inches, 47.5 in3) (Optional)

Maximum Displacer Insertion Length(4)

Standard lever arm length plus one 6‐inch extension,

horizontal or vertical

Displacer Material and Maximum Sensor Working

Pressure(5)

PVC Displacer: Consistent with CL1500 pressure

temperature ratings per ASME B16.34 up to

maximum pressure of 258 bar (3750 psig).

For PED (97/23/EC) maximum pressure limited to 200

bar (2900 psig)

S31603 SST Displacer: CL600 pressure temperature

ratings per ASME B16.34 up to maximum pressure of

99.3 bar (1440 psig)

Note: For slip‐on flange connection, maximum sensor

working pressure must be consistent with the flange

ratings

Displacer Material and Sensor Temperature

Limits(5)

PVC Displacer: -18 to 71_C (0 to 160_F)

S31603 SST Displacer: -40 to 204_C (-40 to 400_F)

Operative Ambient Temperature Limits(5)

Controller: -29 to 71_C (-20 to 160_F)

Declaration of SEP

Fisher Controls International LLC declares this

product to be in compliance with Article 4 paragraph

3 of the PED Directive 2014/68/EU and Part 1,

Requirement 8 of the PESR Regulation. It was

designed and manufactured in accordance with

Sound Engineering Practice (SEP) and cannot bear the

CE marking related to PED compliance or the UKCA

mark related to the PESR Regulation.

However, the product may bear the CE or UKCA

marking to indicate compliance with other applicable

European Community Directives or UK Regulations

(Statutory Instruments).

NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.

1. Any deviation from the standard construction described in the input signal specification above requires special displacer sizing considerations. Contact your

Emerson sales office for information.

2. Minimum specific gravity values apply to both horizontal and vertical displacers with standard lever arm length .

3. Converting from a threaded NPT connection to a flange connection is to be done by the end-user. Refer to Converting a Threaded NPT Connection to a Flange

Connection instruction Manual Supplement (D103277X012), available at Emerson.com or from your Emerson sales office.

4. Standard lever arm length.

5. The pressure and temperature limits in this document and any applicable code limitations should not be exceeded.

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Table 2. Specifications - Transmitter

Input Signal Source

Hall Effect Sensor and magnet array

Transmitter Output Signal

Analog: 4 to 20 mA DC

High saturation: 20.5 mA

Low saturation: 3.8 mA

High alarm(1):> 21.0 mA

Low Alarm(1):< 3.6 mA

Digital - PENDING:

HART 1200 Baud Frequency Shift Keyed (FSK)

HART Version 7

HART impedance requirements must be met to

enable communication. Total shunt impedance

across the master device connections (excluding the

master and transmitter impedance) must be between

230 and 600 ohms.

HART receive impedance:

Rx: 28.06k ohms

Cx: 5.84 nF

Output Current Limit: 30 mA DC maximum

Integral Limit Switch - PENDING

Two isolated solid state limit switches, configurable

throughout the calibrated travel range or actuated

from a device alert

Off State: 0 mA (nominal)

On State: up to 1 A

Supply Voltage: 24 - 30 VDC

Travel Limit Trip Points

Two

Recommended Power Supply

24 to 30 volts DC; 25 mA

Instrument has reverse polarity protection.

A minimum compliance voltage of 17.75 VDC (due to

HART impedance requirement) is required to

guarantee HART communication

Reference Accuracy

$1% of output span. Includes combined effects of

hysteresis, linearity, and deadband

Limit Switch: 2% of travel span

Repeatability

$0.25% of span

Electromagnetic Compatibility

Meets EN61326-1:2013

Performance is shown in table 3 and

EN61326-3-2:2008

Performance is shown in table 4

General Electrical Safety - Environmental

Conditions

Use: Indoor and Outdoor

Altitude: up to 2000 m

Temperature: -40C to +80C

Relative Humidity: 9.2 - 90%

Supply Voltage Fluctuations: N/A, not connected to

Mains

Transient Overvoltage: Category I

Pollution Degree: 4

Wet Locations: Yes

Operating Ambient Temperature Limits

-40 to 80_C (-40 to 176_F)

Hazardous Area Approvals — PENDING

cCSAus—Intrinsically Safe, Explosion‐proof,

Division 2, Dust Ignition‐proof

ATEX—Intrinsically Safe, Flameproof, Type n,

Dust by intrinsic safety

IECEx—Intrinsically Safe, Flameproof, Type n,

Dust by intrinsic safety or by enclosure

Electrical Housing - PENDING

cCSAus—Type 4X, IP66

ATEX—IP66

IECEx—IP66

Note: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.

1. Only one High/Low alarm available in a given configuration. Alarms are NAMUR NE43 compliant.

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Table 3. EMC Summary Results - Transmitter—Immunity per EN61326-1

Port Phenomenon Basic Standard Test Level Test Results(1)(2)

Enclosure

Electrostatic

discharge (ESD) IEC 61000-4-2 4 kV contact

8 kV air A

Radiated EM field IEC 61000-4-3 80 to 1000 MHz @ 10V/m with 1 kHz AM at 80%

1400 to 6000 MHz @ 3V/m with 1 kHz AM at 80% A

Radiated power

frequency magnetic

field

IEC 61000-4-8 30 A/m at 50 and 60 Hz A

I/O signal/control

Burst IEC 61000-4-4 1 kV A

Surge IEC 61000-4-5 1kV (line to ground only, each) B

Conducted RF IEC 61000-4-6 150 kHz to 80 MHz at 3 Vrms A

Protective earth

Burst IEC 61000-4-4 2 kV A

Surge IEC 61000-4-5 2 kV (line to ground only) B

Conducted RF IEC 61000-4-6 150 kHz to 80 MHz at 3 Vrms A

1. A = No degradation during testing. B = Temporary degradation during testing, but is self‐recovering. Specification limit = +/- 1% of span.

2. HART communication was considered as “not relevant to the process” and is used primarily for configuration, calibration, and diagnostic purposes.

Table 4. EMC Summary Results - Transmitter—Immunity per EN61326-3-2

Port Phenomenon Basic Standard Test Level Test Results(1)(2)

Enclosure

Electrostatic

discharge (ESD) IEC 61000-4-2 6 kV contact

8 kV air A

Radiated EM field IEC 61000-4-3

80 to 1000 MHz @ 10V/m with 1 kHz AM at 80%

1400 to 2000 MHz @ 10V/m with 1 kHz AM at 80%

2000 to 2700 MHz @ 3V/m with 1 kHz AM at 80%

Radiated power

frequency magnetic

field

IEC 61000-4-8 100 A/m at 50 and 60 Hz A

I/O signal/control

Burst IEC 61000-4-4 1 kV A

Surge IEC 61000-4-5 1 kV (line to ground only, each) FS

Conducted RF IEC 61000-4-6 10 kHz to 80 MHz at 10 Vrms A

Protective earth

Burst IEC 61000-4-4 2 kV A

Surge IEC 61000-4-5 1 kV (line to ground only) A

Conducted RF IEC 61000-4-6 10 kHz to 80 MHz at 10 Vrms A

1. A = No degradation during testing. B = Temporary degradation during testing, but is self‐recovering. FS = Fail Safe. Specification limit = +/- 2% of span.

2. HART communication was considered as “not relevant to the process” and is used primarily for configuration, calibration, and diagnostic purposes.

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Security

NOTICE

Physical security is an important part of any security program and is fundamental to protecting your system.

Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end users equipment. This

could be intentional or unintentional and must be protected against by restricting access to unauthorized personnel in your

facility.

D The L2t controller cover can be padlocked to the controller base, using the lock mount holes, to protect against zero

adjustment changes, see figure 1.

D The L2t has several features to help protect against unintentional configuration changes:

d System stores configuration and log data

d Signed Firmware

d Configuration lock switch

d Cannot be connected directly to a network and cannot access the worldwide internet

D If unsecured, any device in the field is vulnerable to a physical attack; safety and security procedures must include

mitigation by physical security controls.

D The following are unsecured, unencrypted inputs and outputs used by the L2t transmitter:

d AO – position feedback

d DO – two solid state position limit switches

d HART - used for digital communication

d Zero pushbutton, Span pushbutton, and LED indicator – used for local calibration

D The configuration lock switch, located under the terminal cover, will prohibit configuration and calibration changes

over all interfaces. Refer to the Calibrate section (page 12) for additional information on the lock switch.

D The L2t has optional applications for configuration and data viewing. When such applications are used, they must

run on devices that are configured according to local security policies.

D The device has been developed using secure coding principals and procedures, including threat modeling and

security specific testing. It has several interfaces for configuration, with each of them having an option to disable

write options.

D There are multiple ways to configure the device, including:

d The Zero pushbutton and the Span pushbutton, located under the cover.

d The FDI (Field Device Integration) or DD (Device Description) used with asset manager software such as AMS

Device Manager or a handheld communicator such as Emerson Trex.

D Product Operation Best Practices:

d Ensure that operation personnel are trained both on local security policies and the secure operation of the L2t.

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

d It is recommended that you set the configuration lock switch in the enabled position after configuration is

complete.

d Operate the device within a controlled and secured physical environment.

d Operate the L2t and the FDI/DD host within a controlled and secured network environment.

d Configure the FDI/DD host to allow users to have least privilege access to the L2t, providing access to only what is

absolutely required to perform their job function.

d Apply security patches and updates as they are released.

D Report security incidents and potential product vulnerabilities at:

https://go.emersonautomation.com/reportvulnerability_en

D Password Management Best Practices:

d Manage FDI/DD host user passwords per local security policy.

D Product Disposal

d see Product Disposal Guidelines section (page 26) for recommendations on securely disposing an unneeded

device.

Installation

WARNING

Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal

injury.

To avoid personal injury or property damage caused by the sudden release of process fluid, be certain the service

conditions do not exceed the sensor pressure limits. Use pressurelimiting or pressurerelieving devices to prevent service

conditions from exceeding these limits.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

If installing this into an existing application, also refer to the WARNING at the beginning of the Maintenance section of this

instruction manual.

Attaching a Vertical Displacer

Refer to figure 2 for part locations.

1. Thread jam nut (key 63) all the way onto the threaded portion of the universal joint assembly (key 69).

2. Thread the displacer (key 81) all the way onto the threaded portion of the universal joint assembly.

3. Tighten the jam nut against the displacer.

Attaching a Horizontal Displacer

Refer to figure 2 for part locations.

1. Thread the displacer (key 81) all the way onto the displacer rod (key 64) or extension (key 82) and tighten.

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Attaching the Sensor to the Vessel

Insert the displacer end of the L2t sensor into the vessel connection and tighten enough to seal the threads. If

necessary, loosen or tighten slightly to obtain the horizontal orientation shown in figure 2. Make sure that the

controller case is level.

NOTICE

The displacer rod (key 64) is not a handle. Grasp sensor body or controller housing to lift and carry to avoid internal

component damage.

Figure 2. Sensor Orientation and Parts

CORRECT CONTROLLER MOUNTING

HOLE ORIENTATION WHEN MOUNTED ON VESSEL

A6639

SECTION C-C

SCALE 2:1

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

Electrical Connections

WARNING

Select wiring and/or cable glands that are rated for the environment of use (such as hazardous area, ingress protection, and

temperature). Failure to use properly rated wiring and/or cable glands can result in personal injury or property damage

from fire or explosion.

Wiring connections must be in accordance with local, regional, and national codes for any given hazardous area approval.

Failure to follow the local, regional, and national codes could result in personal injury or property damage from fire or

explosion.

To avoid personal injury resulting from electrical shock, do not exceed maximum input voltage specified on the product

nameplate. If the input voltage specified differs, do not exceed the lowest specified maximum input voltage.

Personal injury or property damage caused by fire or explosion may occur if electrical connections are attempted in a

potentially explosive atmosphere or in an area that has been classified as hazardous. Confirm that area classification and

atmosphere conditions permit the safe removal of the terminal box cover before proceeding.

1. Remove the terminal box cover.

2. Route the field wiring into the terminal box through the conduit connection, see figure 3.

Note

Install conduit using local and national electrical codes relevant to the connection.

3. Connect the control system input channel positive wire to the LOOP + terminal (see figure 4 for wiring diagram.)

4. Connect the control system input channel negative wire to the LOOP - terminal (see figure 4).

5. Install a 250 ohm resistor to provide correct impedance for HART communication on the LOOP - terminal.

6. Replace and hand tighten the cover on the terminal box.

Figure 3. Transmitter without Cover

ZERO PUSHBUTTON

SPAN PUSHBUTTON

CONFIGURATION

LOCK SWITCH

LED INDICATOR

SWITCH TERMINAL

4-20 mA WITH

HART CONNECTION

FAULT HIGH OR LOW SWITCH

CONDUIT

CONNECTION CONDUIT

CONNECTION

Instruction Manual

D104782X012

L2t Liquid Level Controller

October 2023

NOTES:

1 RECEIVING DEVICE MAY BE ANALOG CURRENT INPUT TO DISTRIBUTED CONTROL SYSTEM, PROGRAMMABLE LOGIC CONTROLLER OR

INDICATING DEVICE. INDICATING DEVICE CAN BE A VOLTMETER ACROSS A 250 OHM RESISTOR OR A CURRENT METER.

2 CONFIGURABLE SWITCH. DEFAULT SETTING: DURING NORMAL OPERATIONS, SW1 AND SW2 ARE ENERGIZED. SW1 AND SW2 ARE USER

CONFIGURABLE AS TO WHETHER THEY ARE NORMALLY OPEN (NO) OR NORMALLY CLOSED (NC). AS SHIPPED FOR BOTH SWITCHES IS DEFINED AS

NORMALLY OPEN, DISABLED. A TRIPPED (OR ALARM) CONDITION IS WITH THE SWITCH(ES) DE‐ENERGIZED, WHICH CONNECTS THE COMMON (C)

TERMINAL TO THE NORMALLY CLOSED (NC) TERMINAL.

*WHEN THE SWITCH IS DEFINED AS NORMALLY OPEN, THE SWITCH WILL ALLOW THE CURRENT TO FLOW THROUGH ONCE IT IS ACTUATED (HIGH

OR LOW LIMIT BEING TRUE). IN ZERO POWER STATE, NO CURRENT WILL FLOW THROUGH THE SWITCH.

*WHEN THE SWITCH IS DEFINED AS NORMALLY CLOSED, THE SWITCH WILL NORMALLY ALLOW CURRENT FLOW. THE SWITCH WILL STOP THE

CURRENT ONCE IT IS ACTUATED (HIGH OR LOW LIMIT BEING TRUE). IN ZERO POWER STATE, NO CURRENT WILL FLOW THROUGH THE SWITCH.

3 RESISTOR REQUIREMENTS: NOMINAL 1K OHM RECOMMENDED.

Figure 4. Wiring Diagram with easy-Drive Actuator

POWER

SUPPLY +

4 TO 20 mA +

TRANSMITTER FIELD WIRING

POSITION SWITCH FIELD WIRING

GROUNDING

TERMINAL

SW2

SW1

EARTH

GROUND

DEVICE

RECEIVING LOW

POSITION

SWITCH OUTPUT

(CONTACT

CLOSURE)

DEVICE

RECEIVING HIGH

POSITION

SWITCH OUTPUT

(CONTACT

CLOSURE)

LOOP +

LOOP -

LED

INDICATOR

250 OHM

RESISTOR

easy-DRIVE

4 TO 20 mA

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