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Bargraph and Ribbon displays

Bargraph and Ribbon displays are ideal for showing relative amounts, such as level, temperature, weight, pressure etc.

BAR-A and BAR-X process bargraph indicator Tri-colour bargraphs PRO-BAR large format process bargraph indicator


They give a quick idea of how hot, heavy, full etc something is.

4-20mA, 0-10V process input bargraph displays

Display almost any physical variable...
The bargraph displays on this page accept most common process signals such as 4-20mA, 0-10V, 1-5V etc. All can be scaled to read in your preferred engineering units.

Most have a 24V excitation output voltage which you can use to power a 2 wire or 3 wire input loop.

Suited for these applications and more:-

  • Level measurement - use a depth or level sensor
  • Pressure measurement - use a pressure transmitter sensor
  • Tank contents display - use a level sensor
  • Temperature measurement - use a temperature transmitter
  • Humidity measurement - use a humidity transmitter
  • Any physical variable having a 4-20mA or 0-10V signal
[Tri-Colour bargraphs] [BAR-A] [BAR-X] [PRO-BAR]




New: Ex nR Atex Certified build options available

Atex and Ex nR certified explosion proof andons, digital panel meters, transmitters, bargraph displays and large digital displays

For hazardous areas we can offer the following explosion proof options on most models. Tell us what you need and we will be pleased to quote for Atex certified systems
  • Zone 1 ii 2 G Ex px iiC T6/T5/T4 Gb - Requires pressurised air system
  • Zone 2 ii 3 G Ex nR iiC T6/T5/T4 Gc - any product
  • EXD Zone 2 on request - POA


Ex nR certified large digital displays


The London Electronics ATEX certified products are supplied certified for use in the condition in which they are supplied. No liability will be assumed for any loss or damages of any nature, direct or indirect, including any loss of profits or consequential damages, injury or death suffered or incurred by the buyer as a consequence of failure to install, use and/or apply the product within the scope of the installation document and certification supplied.


Stop Press: March 2017

BE101P BE051P DROP-IN Replacement

We now have Exact, FORM, FIT and FUNCTIONAL new-manufacture replacement units for OBSOLETED BE101 and BE051 Bargraphs. IDENTICAL inputs, display, control and communication.

For details, please call and we will pass your request to our authorised distributor.


Model BAR-A and BAR-X

The BAR-X and BAR-A are user friendly programmable process bargraph displays.

BAR-A and BAR-X process bargraph indicator

The BAR-A is for display only, the BAR-X includes 2 alarm relays. They can mount either vertically or horizontally and are unique in their ease of setup - programmable, but without menus! A fully customisable scale sheet fits behind the protective front window, to allow you to read off the value in your own engineering units.

Input connectionsCurrent input, Voltage input, Excitation

Suits direct connection, 2 wire active or passive loop and 3 wire transmitter systems.
Input SignalsCurrent input terminal accepts:-
0-10mA, 0-20mA, 4-20mA
33 Ohm input resistance

Voltage input terminal accepts:-
0-5V, 1-5V, 0-10V
1 Megohm input resistance.
Excitation24V DC up to 100mA (5V, 10V and 12V optional)
Display75mm long bargraph with 30 segments.
You can select either moving dot or progressive bargraph formats.
Digit colourRed or green.
ScalingDigital menu-free system.
FilteringAdjustable FAST or SLOW response
Front panel controlsCalibration, Alarms.
Power11-30VDC or 95-265 VAC
Accuracy+/-3% of range
Thermal stability - range+/- 100ppm/oC
Thermal stability - offset+/- 100ppm/oC
Analogue outputNot available on this model
Alarm output2 Alarms rated 5A 250VAC SPDT
Available on the BAR-X only.
Pump-control action included as standard.
Serial data outputNot available on this model
Bezel size96mm wide x 48mm high. 13mm forward.
Panel cutout92mm wide x 45mm high. +1mm, -0mm
Depth behind panel125mm including connectors + cable.
SealingIP54 standard, IP67 with optional SPC4 cover
Manual... See operating Manual
Manual... See datasheet



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Tri-Colour and 7-Colour Bargraphs

These bargraphs are made in Poland

Tri-colour bargraphs

Model LEL-NA5Model LEL-NA6
Numeric displayScalable 4 digit display
-1999 to +9999
Choose red, green, yellow or blue
Scalable 4 digit display
-1999 to +9999
Choose red, green, yellow or blue
Bargraph55 segments in 3 colours
29 segments in 7 colour
48 segments in 3 colours
29 segments in 7 colour
Size48x144mm
100mm deep
48x144mm
100mm deep
InputsSingle Channel

RTD
PT100, PT500, PT1000

TC types
J,K,N,E,R,S,T

Resistance
0-400 or 0-4000 Ohm

Voltage
0-60mV, 0-3V, 0-10V,
0-200V, 0-600V

Current
0-5mA, 0-20mA, 0-2A, 0-5A

Dual Channel

RTD
PT100, PT500, PT1000

TC types
J,K,N,E,R,S,T

Resistance
0-400 or 0-4000 Ohm

Voltage
0-60mV, 0-3V, 0-10V,
0-200V, 0-600V

Current
0-5mA, 0-20mA, 0-2A, 0-5A

Output options4-20mA or 0-10V
0 or 4 relays
0 or 8 open collector NPN
RS485 Modbus
4-20mA or 0-10V
0 or 4 relays
0 or 8 open collector NPN
RS485 Modbus
Power95-253VAC or 20-40VDC 95-253VAC or 20-40VDC


connections for tri-colour and 7 colour bargraphs

Manual...Datasheet

Manual... Manual for NA3

Manual... Manual for NA5

Manual... Manual for NA6






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PRO-BAR large bargraph display

The PRO-BAR is a large display-only format process bargraph display with 250mm scale length.

They can mount either vertically or horizontally.

A fully customisable scale sheet fits behind the protective front window, to allow you to read off the value in your own engineering units.

PRO-BAR large format process bargraph indicator




Input connectionsCurrent input, Voltage input, Excitation

Suits direct connection, 2 wire active or passive loop and 3 wire transmitter systems.
Input SignalsCurrent input terminal accepts:-
0-10mA, 0-20mA, 4-20mA
33 Ohm input resistance

Voltage input terminal accepts:-
0-5V, 1-5V, 0-10V
1 Megohm input resistance.
Excitation24V DC up to 100mA (5V, 10V and 12V optional)
Display250mm long bargraph with 50 segments.
Digit colourRed or green.
ScalingZero and Span potentiometers
Power95-265V AC / 11-30V DC
Accuracy+/-0.5% of range
Thermal stability - range+/- 100ppm/oC
Thermal stability - offset+/- 100ppm/oC
Analogue outputNot available on this model
Bezel size (wall mtg)95mm wide x 310mm high
Bezel size (panel mtg)111mm wide x 326mm high
Panel cutout (if you plan to panel mount the bargraph)96mm wide x 311mm high. +1mm, -0mm
Depth110mm including cable.
SealingIP65 all round
Manual... Operating manual
Manual... Data Sheet


Custom special bargraphs.
We can make customised versions of our bargraphs to suit your exact needs. Just tell us what you want and we will be pleased to quote.

1 metre tall bargraph

triple bargraph with 500mm scales

Using an INT4-P to drive a Titan message display as a bargraph...
Large format bargraph display




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