Belt weigher

Posted in: , on 19. Oct. 2002 - 07:54

We are seeking to install a belt weigher to meassure the material capacities. The conveyor of 650 bw is 200m long at 9 degree inclination running at 1.7m/s and carrys 110 TPH. The material is UREA BULK granulars of 0.7t/cu.m density.

The accuracy we need is 0.25.

-Is it possible to get this accuracy?

-Any disadvantage if belt weigher installed at inclined portion?

-What are the points that can cause belt weigher inaccuracy?

-How we can conclude that the material carried out is within the limits after dead load caliberation.

please comment

Grandhe Ramesh

Belt Weigh Meter

Posted on 6. Dec. 2002 - 05:18

Very difficult. belt tension does affect your readings. and this is not what you say a constant value. even in horizontal conveyors. The longer it is the more un precise it gets.

If yow can isolate yourselves from the long sloped conveyor and buy a load center with its own short belt. or weigh before or after the sloped conveyor.

Good luck. Marco Flores

TECMEN Consultant in: Sponge Iron (DRI) handling Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis Pneumatic Conveying Consultants Phone 5281 8300 4456.
(not verified)

Re: Belt Weigher

Posted on 29. Apr. 2003 - 03:24

Dear Mr. Grandhe

Your accuracy requirement of 0.25% is very possible and has been achieved in numerous applications.

If you can send me details of your application we can assess it and / or put you in touch with our experts in Singapore.

Please download the application form from

and return to me at


Mike Tallevi

p w chase
(not verified)

Re: Belt Weigher

Posted on 1. May. 2003 - 12:30

Your accuracy requirement of 0.25 percent is marginally achievable. An iomportant factor is the availability of on-site weighing to perform the calibration. Suggest you contact CST in Australia as they have a number of approved scales.


best regards

P W Chase


Posted on 29. Jun. 2003 - 05:44

Be carefull.

belt scales in long slopped conveyors can work well in the first year .

Then , you have to account for stuck iddlers, , crusting and all kinds of real world factors, again the shortest the conveyor the best.


TECMEN Consultant in: Sponge Iron (DRI) handling Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis Pneumatic Conveying Consultants Phone 5281 8300 4456.

Re: Belt Weigher

Posted on 4. Jul. 2004 - 06:28

1/4% scales are indeed possible, but I have to agree with Mr. Flores. Urea and any of the fertilizer products can be extremely hard on bearings and structures. You may want to consider the solid roll type idlers, and possibly a stainless steel scale carriage.

regards, Todd Dietrich Kaskaskia Valley Scale Co.

Re: Belt Weigher

Posted on 4. Jul. 2004 - 07:45

Dear Shi Ramesh Grandhe,

The belt weigher you are looking for is mostly possible. The generally used accuracy is 0.5%. However, accuracy of 0.25% is not uncommon.

You can install the belt weigher on 9-degree incline conveyor, if the said inclination is conveying the material without slippage.

The belt weigher accuracy is affected if it is installed in convex or concave curvature, because in this situation the belt tension and its variation will affect the load on weighing idler. The load on weighing idler should only be due to gravity for accurate measurement.

As mentioned by other respondents, you have to choose the material of construction immune to the chemical effect. The incrustation of material on weighing platform, idler etc. should be prevented and it should be regularly cleaned.

There are well known routine calibration methods. The manufacturer and supplier of belt weigher can provide you the required information. Present day electronic belt weighers have inbuilt auto-calibration system.

The load cell accuracy will be of much higher order (close to 0.1%). However, the accuracy we are referring to is for the belt weigher as a system. You can get better accuracy by longer weighing platform with more numbers of idlers on the platform.


Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Advisor / Consultant for Bulk Material Handling System & Issues.

Email :

Tel.: 0091 (0)20 25882916

(not verified)

Re: Belt Weigher

Posted on 27. Jul. 2004 - 04:35

Dear Shi Ramesh Grandhe,

A multi-idler belt scale is not the only method of accuratly weighing this material. Comptrol manufactures a belt scale, Model 15B Headweigh, which mounts on the head pulley of the conveyor and can provide an accuracy in the range of 0.25%. Belt scale materials or buildup on idlers is not an issue with this device. If you are interested in this technolgy, more information is available from our website at or we can have our representative in your area contact you.

Please let me know if I can be of assistance.


Len Vienneau, President

Comptrol Technologies Inc.

Belt Weigher

Posted on 5. Sep. 2004 - 08:57

Is it OK to know the volume? We supply a Volume Measure System with an accuracy of 0,25% in fine powders.

This system is free of maintenance, has no influence by the inclination, belt tension or what so ever.

Look at, swith to English, look at Volume Measure System.

kind regards,

Jur Lommerts

Jansen & Heuning Bulk Handling Systems

tel: +31 50 3126 448

Belt Weigher

Posted on 28. Dec. 2004 - 11:54

Dear Mr Ramesh,

You want accuracy of belt scale as 0.25% of what?Is it on FSD or on rated capacity?Kindly let me know first.I faced many problems while purchasing the same.

I installed belt scale on 14 deg. inclined conveyor in TATA STEEL, Jamshedpur & it is giving accurate result.Accuracy also depends on the following factors:

1. Location of belt scale.

2. Trough angle.

3. Type of take-up.

4. Loading on conveyor. etc.....

In order to check the accuracy of belt scale, you need another Check Weighing system.I also installed the same in TATA STEEL.

I repeat that only writing 0.25% accuracy, will land you many problems.So please be care full.

Best Regards.


Belt Weigher

Posted on 13. Dec. 2007 - 06:19

Kindly go through the below link


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Its LM2D and a new model also for better accuracy.


lm2d-0202-1%20datasheet (PDF)

Weight Belt Accuracy

Posted on 14. Dec. 2007 - 10:10

You may find the following publication by The British Material Handling Board useful for assessing performance features.

'Guidelines for Specifying Weighfeeder Systems'

Contact me at

I would also say that it is important to have a good design of the flow route to the feed system of a continuous weighing system to secure a stable and reliable feed that delivers the product in as consistent a state of density as possible. The amount of care required depends to a large extent on the potential variablitiy of the bulk condition, so fine powders require special attention, but in general a system with a good feed arrangement makes the control radically easier.

Belt Weighet

Posted on 12. May. 2008 - 01:24

Dear Sir,

Installation of belt scale in an inclined conveyoy & its accuracy 0.25% is bit a difficult. But now electronic part of the weighing system is improved & with some correction factor we can get an accuracy of 0.25% of FSD.



Belt Weigher

Posted on 23. Feb. 2009 - 05:05

Dear Sir,

It is possible to install a belt weigher under the circumstances u hv mentioned. We can achieve the accuracy of 0.25% by providing 4 Idler stations with 8 Load cells. The 2 preceeding & succeeding Idler stations need to be machined ones. The Idlers need to be maintained for corrosion free movement.

For further details you can contact us.

Thanks & regards



Newton weighing System Pvt Ltd,

A8 Rajdanga Nabapalli


Ph: 033 2442 9991

Mob: 09830425045


Newton Sundar

Posted on 26. Feb. 2009 - 02:37

Dear Mr.G Ramesh,

it is possible to provide that accuracy with multy Idler belt scale. If drop test can be performed then it will be easy to assertain the accuracy.

You may send your details to us.

Thanks & regards


newton weighing system Pvt Ltd, Kolkata