Thursday, May 28, 2020

Troubleshooting for OFL of Weighing Indicator

Considering OFL is a frequent problem of the weighing indicator that mentioned by clients, GM weighing shot this video for self detecting.

The problem of OFL contains 4 situations:

Weight overflow,

weight underflow,

The signal of loadcell too low

The signal of loadcell too high.


There are 4 reasons that can trigger OFL:

First: Indicator parameters setup error,

Second: external wiring error,

Third: loadcell damage,

Fourth: Indicator hardware damage.


The equipment needed for OFL detecting:

A weighing platform with full scale of 20kg,

A GM9907-LD Weighing Indicator,

A weight of 2kg,

A straight screwdriver and a digital multimeter with millivolt voltage range.


Now please follow steps in the video to find out OFL reasons.


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Ferro Concrete Weighbridge

This is the weighbridge for the harshest environment

Concrete weighbridges have always been considered
as the ‘for life’ option due to their rigidity, resistance
to corrosion and anti-friction properties.
Traditional concrete weighbridges have always been
difficult to transport and install due to the high weight
of the structure and re-siting is almost prohibitive due
to these costs.
The ferroconcrete model is a new generation machine
that represents a new concept in weighbridge design.
The weighbridge is manufactured in modules only
1.5m wide and in lengths up to 6m long.
Due to the new design and construction materials,
an 18m weighbridge can be delivered to site on
the standard articulated vehicle, and as no section is
heavier than 5000kg, a smaller crane than is usually
required can be used for the installation.
The ferroconcrete weighbridge can be also be
loaded into a 20’ container making easy export for
international requirements.
The standard pit mounted weighbridge has
removable centre access plates to provide easy
access for pit cleaning without compromising
the integrity of the structure.
For surface mounting, bolt-on side rails are available
as vehicle guides.
As with all of our weighbridges, heavy-duty stainless
steel load cells are used with the latest instrumentation.
Sizes and capacities are available to 30m and 150
Tonnes from standard modules.

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How to Calculate the Center of Gravity


There are n load cells: LC1, …, LCn.

The illustrations below describe systems with 2, 3 or 4 load cells.

However, the formulas used are general for n >= 2.

All the n load cells are calibrated the same.

There is some reference point that serves as the origin of the X,  Y axes.


The ‘i’ index in all the expressions below goes from 1 to n(e.g., for n=3: i = 1, 2, 3).

LCi = Load Cell #i.

(Xi,Yi)= The position of LCi.

Wi = The weight reading of LCi.

Wt = total weight = sum of all Wi.

(Xcg,Ycg)= The position of the CoG (Center of Gravity).

MXi = The X-Momentof LCi = Wi*Xi.

MYi = The Y-Moment of LCi = Wi*Yi.

MXt = The totalX-Moment= sumof all MXi= Wt*Xcg

MYt = The totalY-Moment= sumof all MYi = Wt*Ycg

Xcg = MXt / Wt

Ycg = MYt / Wt




1. Weight units (e.g., kg).

2. Length units (e.g., cm).

3. Position reports format:

# of digits after the decimal point for the CoG X/Y position(e.g., 2).

4. Weightreport’s format:

# of digits after the decimal point for the CoG weight(e.g., 0).

5. n(e.g., 3).

6. Weight(Wi) and position(Xi, Yi) of all load cells.

Note: You may specify the weight & position in free format. That is, you are not subject to the format defined in paragraphs 3 & 4:The effect of these formats is only on the application’s output.



* You may set the “input” of the application to any of the following 6 examples: Select the corresponding serial # (01 à06) in application’s “Example” field.

* Changing the position (X and/or Y) of a load cell might throw its location out of graph limits. Therefore, it is recommended to click “Graph Settings” after changing the load cells position, and verify that graph limits are OK. However, in case a load cell exceeds the limits, the application gives a proper message.

* The application keeps the input of the last report or graph –next time you run, this input will be used automatically.


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Possible configurations of analog passive load cells and indicators

The EN 45501:2015 and OIML R 76 (2006) describes the modular evaluation of load
cells and indicators. The calculation of the compatibility of load cells and indicators is
well documented (in annex F), but the recommendation does not describe the actual
configurations in detail. Only in clause C.1.7 there is some information:
“Only indicators employing six-wire technology with remote sensing (of the load cell
excitation voltage) shall be used if the load cell cable has to be lengthened or if several
load cells are connected by means of a separate load cell junction box.”
This information is by far complete and therefore leads to confusion and
misinterpretation. This white paper intents to fill in this information.
The approach in this white paper is based on generic technical implementations and is
applicable for most weighing indicators. It is independent from the information in the
certificates of load cells and indicators.
  1. The EN 45501:2015 is identical to R 76 (2006) on this issue and therefore has the same interpretation problems.
  2. Previous versions of EN 45501 and R 76 did not address this issue at all, and certificates based on these older versions may have information that does not match this white paper.
  3. In this white paper the “indicators employing six-wire technology with remote sensing” are called 6-wire indicators. Indicators without this technology are called 4-wire indicators.
  4. In this white paper the load cells supporting the “six-wire technology with remote sensing” are called 6-wire load cells. The load cells that do not support this technology are called 4-wire load cells.
  5. If 4 wire load cells are used the cable length shall not be shortened. This applies to all configurations below.

Please click on the link for the complete white paper

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Weigh Trucks / trains in motion

Now you can get the LCIC-WIM board with embedded software to weigh trucks & trains in motion for slow and high speed WIM.

The on-board powerful DSP running our advanced algorithm makes all necessary filters and calculates on-the-fly: the weight, speed and distance between axles. The calculated results are sent to the PC via the USB / RS485 port and allows our customers to make the interface with the user.

We also provide the basic utility for the PC that allows you to immediately check your WIM scale either for truck or trains.

The main screen of our WIM application for trucks:

Below are the results as reported by the LCIC-WIM board:


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Easy to use, high performance, STAINLESS STEEL multipurpose
bench and floor scales for industrial and commercial use.
Manufactured according to OIML R-76 / EN 45501 standards. Available also CE-M APPROVED.

  • 5-key functional waterproof keypad.
  • 25mm LCD backlit display with 6 high contrast digits with icons indicating the active functions.
  • Easy to clean ABS waterproof IP65 enclosure built to withstand harsh treatment and corrosive environments.
  • Functions with one STAINLESS STEEL IP67 load cell.
  • Tubular structure and loading surface in AISI304 stainless steel with adjustable resting feet and level.
  • 3 m cable between platform and indicator.
  • Digital calibration and set up through keyboard or PC with DINITOOLS.
  • Built-in rechargeable battery (60-hour life with one 350 Ohm load cell) and 110 240 Vac internal power adapter.

  • High-Resolution Weighing x 10
  • Net/Gross or lb/kg conversion
  • Accumulation
  • Formula weighing
  • +/- Checkweighing
  • Percentage weighing
  • Counting (Max. resolution of 1.500.000 divisions)
  • In/Out Truck weighing
  • Hold and Peak
  • Peer to peer (up to 4 remote connectable indicators)

  • RS232/C port configurable for connection with printer/labeller, or for attached printer.
  • RS232/C bidirectional port configurable for PC, PLC, remote display, and radio modem
  • Quick RJ RS232 plug connection
  • IR input for remote control

KEYBOARD: Zeroing, Automatic tare, Presettable tare, printing
and/or data transmission, selectable function command, on/off
PRINTING: Configurable print layout with: heading lines (with DINITOOLS)
  • 4 heading lines (with DINITOOLS)
  • Gross Tare Net and ticket number
  • Date and time (only with DFCLK)
  • Print of barcode 39

  • Thermal printer Option Box
  • Time / Date
  • Infrared remote control
  • 433MHz radiofrequency remote control
  • CE-M approved models: 3000 divisions or dual range 3000+3000
  • divisions.

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World Metrology Day

May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875. This treaty provides the basis for a worldwide coherent measurement system that underpins scientific discovery and innovation, industrial manufacturing and international trade, as well as the improvement of the quality of life and the protection of the global environment.

The theme for World Metrology Day 2020 is Measurements for global trade. This theme was chosen to create awareness of the important role measurement plays in facilitating fair global trade, ensuring products meet standards and regulations, and satisfying customer quality expectations.

Across the world, national metrology institutes continually advance measurement science by developing and validating new measurement techniques at the necessary level of sophistication. The national metrology institutes participate in measurement comparisons coordinated by the Bureau International des Poids et Mesures (BIPM) to ensure the reliability of measurement results worldwide.

The International Organization of Legal Metrology (OIML) develops International Recommendations, which aim to align and harmonise requirements worldwide in many fields. The OIML also operates the OIML Certification System (OIML-CS) which facilitates international acceptance and global trade of regulated measuring instruments.

These international metrology systems provide the necessary assurance and confidence that measurements are accurate, providing a sound basis for global trade today and helping us to prepare for the challenges of tomorrow.

World Metrology Day recognises and celebrates the contribution of all the people that work in intergovernmental and national metrology organisations and institutes throughout the year.

Weighing Systems – Pharmaceutical and Biopharmaceutical

In any setting the manufacturing process is like a complex puzzle.  Specifying the appropriate components and equipment provides the backbone for efficient, cost-effective operations. Manufacturing is a precision game where every machine, component and piece of equipment must work in unison. In the pharmaceutical and biopharmaceutical industries, it’s even more so.  Products directly impact the health and well-being of the population, making precision paramount throughout the manufacturing process. In this manifestly complex manufacturing ecosystem, everything from aspirin tablets to cough syrup are expected to deliver consistent dose, form, texture and taste, producing the same symptomatic relief and health benefits pill-for-pill, tablet-to-tablet, or dose-after-dose.

Scale equipment in the pharmaceutical manufacturing setting continues to play a critical and integral role in achieving quality and consistency objectives. To achieve such consistency and quality, the precise weight of each ingredient must be validated. For instance, bench scales and check-weighers can provide a high degree of accuracy in manual operations, while load cells and indicators with advanced ERP Integration capabilities can provide an automated weighing solution. System automation effectively decreases dependence on manual monitoring, manipulation and operation, minimizing human error. By applying advanced weighing technologies to complex pharmaceutical blending and batching applications, manufacturers can enhance quality control, improve inventory management, increase throughput and reduce labor and other production costs.

High-Accuracy Manual Weighing Systems

Bench scales and checkweighers offer pharmaceutical manufacturers versatile weighing capabilities, delivering in-line weighing or package verification prior to distribution. Providing highly accurate, legal-for-trade weighments, bench scales allow manufacturers to mix precise ingredient amounts during processing and afterward employing checkweighers to confirm package quantity. Bench scales and checkweighers are designed to accommodate fast-paced automated processes, delivering instantaneous, exact readings in numeric or easy-to-interpret graphical formats.

Floor Mount Screen, Scale, PrinterBench scales and checkweighers generally feature a simple interface to facilitate use, minimizing errors and increasing production throughput. By clearly displaying Over/Under/Correct, operators can identify at a glance if products meet process requirements for simplified monitoring. Also, to meet pharmaceutical hygiene standards, many bench scales and checkweighers are fabricated of stainless steel, designed to withstand washdown conditions. In pursuit of enterprise connectivity, these scales can also be set up to print results or communicate and store data via standard XML / CSV protocols, delivering to users, among other things, sophisticated product traceability.

Bench Scale/Checkweighers 

Similar to baking, when manufacturing pharmaceutical products, such as vitamins and drugs in tablet form, operators must combine measured amounts of multiple ingredients. For instance, a company that manufactures supplements and vitamins must include the exact amount of each element each time the product is produced to retain its engineered and expected characteristics. By placing a bench scale at each station on the processing line, operators have the ability to precisely measure each component prior to adding it to the mixture. Common practice typically finds users placing batch ingredients directly onto the scale until the pre-determined amount is reached, ensuring batch recipes are followed accurately each time.

Once the dose forms are packaged, checkweighers ensure each container’s weight meets the designated amount listed on the package. Once the tolerances have been inputted into the scale, operators will be able to decipher immediately whether the product meets weight requirements. For example, if a given jug of powdered supplement is placed on the checkweigher, displaying Over/Under/Accept fan graphs allows operators to determine if its weight corresponds to what is listed on its label.

Scale Systems for Automated Pharmaceutical Processing

A weight sensor, or load cell, is a steel structure with strain gauges, or electronic sensors, positioned on the outside surfaces: two sensors on the top and two on the bottom. Unsupported on one end and fixed on the other, this structure acts as a cantilever. When a load is applied on the unsupported end, the sensors detect strain in the structure and provide an analog mV/V output. This output is interpreted by indicator electronics, and the weight indicator digitally displays the strain as the load’s weight.

For pharmaceutical batching and blending applications, electronic weight sensors can be affixed to bins, tanks or hoppers holding dry or pre-mixed ingredients, effectively transforming ingredient containers into highly accurate, in-line scale solutions. As materials are placed into a container, the electrical current running through each weight sensor changes, and this altered current is brought to and combined at a junction box. From here, the collected data is sent via interface cable to a scale indicator, which converts the current to a digital weight display.

In these operations, the accompanying indicator is a key component, because it can be programmed to control filling and batching applications through bin or hopper monitoring — observing each operation until its designated container meets a user-programmed set-point. Adding weight sensors to existing packaging and batching equipment is, in most cases, straightforward and unobtrusive, and not likely to disrupt operations if installed. Similarly, sensors equipped with stainless-steel housings withstand washdown in pharmaceutical and chemical applications.

Ingredients dispensed into the container cause the suspended end of the weight sensor to deflect slightly as it absorbs the force of the load. The force measurement is then translated as the ingredient’s weight. As subsequent ingredients are added, the weight sensor deflects an appreciable amount from its current position to represent the new ingredient’s weight. The suspended end of the load cell then returns to its initial position once the container is emptied. Adding to this design, some weight sensors have two pairs of electronic sensors  located on the outside of the weight sensor structure, one pair on top and one on the bottom. This sensor arrangement helps ensure uniform compressive strain throughout the structure, which eliminates the effects of end loading, side loading and torsion effect.

Indicators are the heart of this weighing system, collecting and communicating data throughout the manufacturing enterprise for heightened process transparency and streamlined, cost-effective production. Indicators are also multitaskers, with some capable of simultaneously monitoring several independent scales, as well as directly controlling automated weight-based operations.

To facilitate at-a-glance decipherability, indicators can provide a combination of text and graphics that clearly convey process status and product weights. For instance, horizontal bar graphs can display over/under readings in checkweighing operations, vertical bar graphs display ingredient amounts, and pie graphs track rapid fill operations. This reduces read errors and allows operators to quickly take action if a process becomes obstructed or products do not meet weight regulations.

With fast-paced production speeds and minute margins for error, indicators with sophisticated data acquisition and management improve efficiency and throughput. For example, indicators can be programmed to automatically recall recipes, track product usage and update inventory records based on the amount of product used or remaining. Plus, indicators that interface with common industry-standard protocols enable the device to connect with diverse serial devices, including printers, bar code scanners, label printers and remote displays. This allows data to be stored and printed from the indicator, downloaded and reformatted by a host PC or accessed via an Intranet or Internet connection.

Automated Systems, Improved Production

Given that pharmaceutical end products must be pure and consistent, batching and blending applications must be verifiably exact to protect product integrity. In many plants, manufacturers store raw ingredients or pre-mixed formulas in tanks or hoppers to be dispersed during production. By integrating weight sensors and indicators with these containers, users can not only ensure accurate measurements and product consistency, but can also perform advanced data acquisition and inventory management procedures.

Coupling weight sensor technology with an indicator that stores recipe components ensures the exact amount of each ingredient is dispensed, without requiring operator intervention. The weight sensors are placed on each leg of the material container to capture readings, and an indicator with recipe-recall is integrated with plant devices and communicates with PLCs, PCs and other vital operating systems to provide an automated weighing solution. Once the measurement parameters have been entered into the indicator the automated weighing systems can be configured to recall recipes, routinely measuring according to the specified weight values or percentages.

As the pharmaceutical product moves through the production process, the indicator monitors the weight sensor to identify when the proper amount of product has been released. Once the product meets a configured dispensing station, the indicator sends a signal to begin dispersal of the first ingredient until the set point is reached. The indicator then uses its output to communicate this status to the filling equipment’s control system which, in turn, closes the product release valve on the first hopper and begins dispensing the second ingredient. The process continues until the batch is complete. Additionally, some indicators can store multiple recipes at once to ease product changeover.

Further, these automated scale systems can accommodate rapid product switchover, controlling multiple weighing requirements in a single application while delivering high-quality results. For additional automation, indicators can be configured to track product usage, keeping a running total for inventory purposes — maximizing process efficiency and reducing inaccuracies associated with operator error.

Benefits of Automated Production

Using a system that automatically tracks material disbursement and usage enables operators to increase inventory control, product quality and customer satisfaction, all while decreasing labor and production costs. Automated electronic scale systems offer unmatched reliability with minimal human error and costs.

Bench Scale, Screen, Scanner, BowlSince customers depend on pharmaceutical products to improve or maintain their health, any minute inconsistency could have drastic consequences. Blending and batching applications hinge on a manufacturer’s ability to obtain accurate measurements. Therefore, utilizing an automated weighing system that makes operator monitoring obsolete, manufacturers can perform frequent quality checks, while eliminating the need for a separate checkweigher and manual supervision. By utilizing the indicator’s ability to communicate with and control plant devices, these applications will be completed the same way every time, which promotes product consistency.

Inventory management is directly correlated with a company’s pocketbook, as both shortages and waste result in significant lost revenue. For instance, when pharmaceutical plants experience shortages, this can lead to production halts, and extended downtime can be costly. Alternatively, given that some of the materials used to make these products have a window of viability, any excess, unusable materials must be thrown away, translating into lost profitability.

Automated scale equipment actively tracks and monitors product usage and remaining amounts, logging and communicating real-time product inventory updates. Plus, to ensure these records are constantly refreshed, the system relays this information to office computers, signaling when product inventory is low and reordering is necessary. For example, indicators can be programmed to measure the weight of a tank after each time the product is dispensed, repeatedly calculating the amount left. The indicator automatically totals product usage and eliminates risks of shortage and surplus concerns.

Today’s focus on efficiency and cost-effectiveness will continue to drive the way manufacturers piece together the components that make up their plant floors. Though the configuration may evolve, using equipment that promotes productivity and quality while simultaneously driving down costs will remain a constant. Implementing scale equipment integrated fully into production is a key element in streamlining pharmaceutical operations for improved profitability and customer satisfaction.


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500kg Bi-Directional Load Pins


For one of our regular Netherlands based customers, we have manufactured these 500kg rated bi-directional load pins. This means that they have been calibrated in two directions so that they can be used to measure loads coming from both the top and underneath the load pins. They also feature integral 2 wire ICA5 amplifiers to provide 4-20mA output for simple connection to a display/indicator to view load measurement data.


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Getting Measurements Off the Ground


What Effects Earth and Mass Have on the Quality of Your Measurement Results

This episode of the HBK Expert Talk is about the separation of earth and ground: A topic that at first sight does not have so much to do with measurement technology. But nevertheless, the exact differentiation of earth and mass has important effects on the quality of your measurement results. Why this is so, and which calculations you should make, is explained to you by HBK Academy trainer Patrik Ott. As always full of enthusiasm, easy to understand – and technically well-founded. Have fun learning!


In this episode of HBK Expert Talk, you will learn…

  • … what the differences between earth and ground are – and why it is so important for your measurement projects to keep both separate!
  • … what “ground” really means
  • … why an “ideal technological setup” only exists in theory (or when everything is switched off) – and how you can deal with the imperfect real technological conditions
  • …what you should NEVER do under ANY circumstances during your measurements when it comes to go earth and ground.


To watch the full Expert Talk Click the source link below

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