Ask us...
News ...
London Electronics Ltd
What we do Home Contact us
Our Clients Videos
London Electronics Ltd on stand GO3 of the PPMA Show

Bargraph and Ribbon displays

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




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
See operating Manual
See datasheet



[^]

Tri-Colour and 7-Colour Bargraphs

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

Datasheet
Manual for NA3
Manual for NA5
Manual for NA6
Programming software app for NA series
RS485 to USB converter





[^]

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

Calculating liquid content in a cylinder at different depths to help scale your bargraph

volume calculation for horizontal or vertical cyclinders



Orientation of the cylinder: Horizontal Vertical
Unit of measure: Centimeters Inches
|
Length
Diameter
Depth
|
|
The liquid volume is ...





If you want to build your own application, perhaps on a PLC or computer, you can use this formula to find how much liquid is in a horizontal cylinder with flat ends.

If you use inches for your measurements, the result will be cubic inches.
If you use centimeters for your measurements, the result will be cubic centimetres.

Formula to calculate the volume in a horizontal tank


this is the relationship between percentage depth and percentage volume


Other useful related formulas...

formula for volume calculation for horizontal or vertical cyclinders

Tank contents measurement is one of the most common measurements in industrial processes.

Yet, it can prove difficult to measure volume accurately, especially if your storage tank has irregular or curved sides.

We'd like to offer you a few simple, reliable solutions.

Low cost methods...

1. Direct Calibration
This is the simplest and most reliable method, as it automatically takes into account any curvature of your tank, offset in the pressure sensor, SG of liquid etc.

Connect your pressure sensor to the INT2-P meter and start with an empty tank.

Set the meter for direct calibration and use the linerarisng function (see manual for details)

Set the 1st cal point so that the display reads 0.

We now want to pump into the tank known volumes of liquid, and we will set the meter to read the tank volume at each point.

Ideally, aim to fill the tank to the brim, and do so by filling to 10 evenly spaced volumes.


2. Theoretical Calibration
What if you can't start from an empty tank and it will be difficult to pump in known volumes up to the capacity of the tank?

You can calibrate using the theoretical method, but you will need to know the relationship between volume, (going in 10 steps from 0% to 100% of tank volume) and your sensor signal in mA for each volume.

You will need to know the volume in the tank at different depths.

This method is only suitable if you know the mathematical relationship between your pressure sensor signal and volume in the tank.

You should write a table of signal vs. volume. The more points you include, the greater will be your overall measurement accuracy.

Let's assume you use a pressure sensor with 4-20mA output. You may get a table something like this ...

SIGNALVOLUME
4mA0 gallons
5mA50 gallons
6.44mA100 gallons
8.2mA150 gallons
10.3mA200 gallons
12.7mA250 gallons
14.5mA300 gallons
17.07mA350 gallons
19.4mA400 gallons



Join our Facebook Group Join our LinkedIn Group Join our Twitter Group



Thorncote Road, Sandy, Bedfordshire, SG19 1PU - ENGLAND
Tel +44(0)1767 626444 Fax +44(0)1767 626446
© 1992-2017 London Electronics Ltd.



ISO9001 certified
^
^