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Frequently Asked Questions

At LOMA we like to be as helpful as we possibly can.This FAQ section is designed to help provide quick answers to the common questions asked. Cant find the answer you are looking for? Please contact us酒店雇员和饭馆雇员for any other enquiries.

General FAQ's

When cleaning inspection equipment in food factories, there is no one set cleaning regime to follow. A high-care versus low-care area of a factory will have very different needs as high-care is often wet or dusty, with greater bacterial risk, whereas a low-care area is likely to require less work to keep it clean as a lower bacterial risk.


Basic cleaning advice


Read Instructions

Do not exceed the cleaning chemical manufacturer’s stipulated cleaning chemical concentration levels, as an incorrect ratio might damage the equipment.

Never exceed the time you leave cleaning product in contact with the inspection equipment, as it might be detrimental to the cleaning results, plus harmful to the equipment.


Where possible, dry the equipment prior to recommencing production as prevents the long-term pooling of water that could present a corrosion risk.


Contamination can happen at any point in the production process including at source. Critical Control Points (CCP) are put in place to prevent any potential issues from leaving the factory to help protect the consumer. Hygiene also provides a vital role in eliminating bacterial contamination.

Examples of physical contamination include; production line failure such as broken processing machinery, stones picked up at source in farming of the products or raw materials, bones within a product such as chicken or fish etc.

A contaminant is either physical or bacterial and can happen at any stage of the production process. Examples of physical contamination include;

  • All Metals from other machine failure in the line
  • Stones
  • 骨头
  • Glass
  • Incects
  • Wood
  • Plastics

Short answer

HACCP is a systematic approach to the identification, evaluation, and control of food safety hazards based on the following seven principles:

Principle 1: Conduct a hazard analysis.
Principle 4: Establish monitoring procedures.
Principle 5: Establish corrective actions.

Slightly longer answer

HACCP is a management system in which food safety is addressed through the analysis and control of biological, chemical, and physical hazards from raw material production, procurement and handling, to manufacturing, distribution and consumption of the finished product. For successful implementation of a HACCP plan, management must be strongly committed to the HACCP concept. A firm commitment to HACCP by top management provides company employees with a sense of the importance of producing safe food.




There are many agencies world wide that are responsible for Food safety standards

European Union

欧盟(EU)的议会使再保险gulations in the form of directives, many of which are mandatory and are incorporated into member countries' national legislation. The EU parliament is advised on food safety by the European Food Safety Authority.



United States

The US food system is regulated by federal, state and local officials. The Food and Drug Administration publishes the Food Code, a set of guidelines that help food control authorities regulate the retail and food service industries.As well as the US Food and Drug Administration, several states have their own state programs to test for pesticide residues

LOMA SYSTEMS is a world leading brand in the food, pharmaceutical and packaging industries, offering Metal Detectors, Checkweighers and X-ray inspection systems.

Our reputation is based on consistent quality and advanced technology, the result of a continuous and far-reaching research and development program. Short lead times, modular design and excellent availability of spare parts, coupled with our passion for customer service, allow our customers to:

  • Comply with, and exceed, product safety standards, weight legislation and retailer codes of practice
  • Maximize production up-time
  • Be self-sufficient
  • Minimize lifetime costs

Our headquarters are based in the UK with direct sales and service operations in France, Germany, The Netherlands, Czech Republic, Poland, China, Canada and the US. We work closely with our distributors and OEM’s in over 100 countries worldwide to ensure that all our customers are fully supported.


Ever since LOMA SYSTEMS was founded in 1969, the company has worked very closely with both food manufacturers and retailers to deliver advances in technology. As a result, LOMA has an unrivalled level of experience and expertise, in the practice of effective metal detection within food industry production lines.

我们最新推出的IQ4系列金属探测器汇集了LOMA、LOCK Inspection、CINTEX和BRAPENTA的经验,以及近50年的客户创新。洛马公司的工程团队采用了“生存设计”的理念,在一个易于安装、易于使用、易于清洁和维护、能够承受恶劣的食品生产环境的包装中提供出色的金属检测灵敏度,并最终带来了卓越的拥有成本。






X-ray Inspection FAQ's

Yes X-ray inspection systems are perfectly safe if you follow the intended use. The X5 X-ray series feature radiation protection to ensure that emissions are kept below 1 μSv/hour during operation. By their very nature, X-ray systems used for food inspection are safe and emissions are significantly less than many naturally occurring radiation sources such as medical X-rays, Radon gas, Gamma decay in rocks, cosmic rays and even the Sun. The world’s average “background” rate of radiation is around 2.7 mSv/yr. Working a 40 hour week for 48 weeks per year next to a LOMA X-Ray system equates to 0.78mSv/yr less. A transatlantic flight for 8 hours provides a much higher dose of radiation than a Loma X-ray inspection system. You can read more information aboutX光对这里的食品生产是安全的。

As with any food inspection system, it depends on the application, where you want to inspect within the production process, the size of your product and what foreign contaminants you are looking to detect. Loma’s X5 X-ray systems are available for a wide range of applications including bulk, packaged, loose and pumped products, for different industries. As an example: If you are looking at a solution within primary processing making sausages, to try and get the best detection of contaminants (such as bone), and to remove waste before it goes through other costly processes, it would be worth considering anX5 Pipelineto be used near the beginning of the process.

When installing an X-ray inspection system into a factory for the first time there are varying requirements depending on your location, but one of our representatives can talk you through the easy processes. For the relevant information in your area please contact your local Loma office or distributor. Below is an example based on the United Kingdom.

  • 您的X光系统需要在使用前向当地健康和安全主管部门注册。(有关当地健康和安全主管的详细信息,请参见在这里)
  • 开机前,您需要咨询并指定一名辐射防护顾问(RPA)。在英国提供这项服务的组织包括Radman Associates公开
  • Health England (PHE).
  • 您的RPA将与您一起完成以下工作:
  • Draw up your local rules (what you can and can’t do onsite relating to your application and equipment)
  • 完成风险评估
  • Train your appointed Radiation Protection Supervisors RPS (An RPS must be present at all times whilst the X-rays are running)
  • 这个过程大约需要28天,这取决于您选择的RPA的可用性。一旦系统启动并运行,您需要按照RPA规定的时间间隔定期进行辐射测试。

Just like metal detection, there are two types of calibration associated with X-ray systems. Firstly in order to maintain designated Codes of Practice or HACCP protocols, X-ray systems should be calibrated once a year to normalize the detector and make sure the system is working correctly. Secondly an X-ray system will need to be calibrated for every new product so that the system can ‘learn the product’ and set up limits to achieve the best contaminant detection size possible. Once a product has been learnt once, it can then be recalled at the click of a button with no need to relearn unless there is a change in the product or if an error occurs.


是的,洛马的X射线系统设计得很容易使用,让任何健康的人都可以在系统首次调试时接受基本培训后操作机器。建议孕妇不要在X光系统工作的区域工作。就像金属探测一样,为了对系统有更深入的了解和它的全部功能预先设计好培训课程are available at all levels including engineer and Subject Matter Experts (SME). It is worth noting that a Radiation Protection Supervisor (RPS) is always required to be present within your factory when the X-rays are running – for more details please see the question below.

X-ray is very versatile at finding different contaminants, but with plastic it depends on its characteristic and the type of product you are trying to inspect it within. The orientation of the plastic within the product impacts the ease of detection, for example if the plastic contaminant is in a horizontal orientation it will absorb fewer X-rays due to its density (thickness) and will not be detected. As a rule of thumb, if it floats, an X-ray system will not be able to detect that contaminant. This is the same for most makes and models of X-ray Inspection systems used within food production.

是的,洛马的X光检查系统带有内置软件,叫做X-称重, which converts product density into weight which is great for certain applications such as yogurts and ready meals. For example if you are weighing a product that has two compartments a checkweigher will check the total weight, where a X-weigh will check each compartment separately providing both an individual and overall weight. This will let you know if there is too much of one component, which could be caused by an issue with a portioning machine, resulting in an inferior product. X-weigh does not conform with weights and measures so a checkweigher would be required to do the total overall weight check.

Stainless steel has a specific gravity of 7.7

Ferrous materials have a specific gravity of around 8.0

Non Ferrous (Brass or copper) materials have a specific gravity of around 8.8

From a Metal Detector point of view Ferrous, Non Ferrous and Stainless Steel have become standard test materials because of the different response they develop in a Metal Detector. Conversely, detectability of materials in X-ray systems are proportional to the specific gravity increase relative to the product; as can be seen all three materials are very close in density. Since Stainless Steel is both the lowest density of the above three materials and the most abundant in factories, it is generally accepted that this is the one test piece worthwhile testing. However, it is always a responsibility for any producer using a CCP to ensure that likely contaminants have been identified via HACCP risk assessment, so this should be additionally considered when selecting the contaminants used to challenge the CCP. Additionally, any specific customer requirements or supermarket specifications should be considered.

Note: Specific Gravity is defined as density normalised to water @ 1.0

LOMA's image processing software is designed to adapt to differences in product density, while maximizing sensitivity. This overcomes the problems associated with conventional systems.

X-ray inspection systems can detect more contaminants than Metal Detection systems, however there are a few limitations including:

  • Low-density plastics
  • Thin glass, such as fluorescent tubes
  • Low-density stones
  • 昆虫
  • Wood
  • Hair
  • Cardboard
  • 纸类
All LOMA machines comply with national emission and safety regulations. When the machine is first installed a documented examination takes place. However, for peace of mind, a periodic examination is advised. As this is a relatively simple process it can be done each day without the need to stop the production line.
No, All of our systems meet the safety ratings of less than 1 µSv/h.
LOMA X射线检查系统设计为以超过600ppm或90m/min(300ft/min)的速度连续运行。
Early X-Ray systems had reliability problems and were expensive. However, the involvement of mainstream inspection specialists like LOMA ensures that new-generation x-ray systems are as robust and reliable as conventional metal detectors with and excellent ROI.
No, LOMA X-ray Inspection systems are designed to be as easy to use as a Metal Detector. Training is provided upon commissioning and additional onsite training can be arranged if required.(Please click here for more details)
No, the dosage a food product can be subjected to is governed by controls. LOMA X-ray inspection systems operate at around one millionth of the current limit.
Loma’s range of X-ray inspection systems are easy to use with intuitive full colour touchscreens and icon-driven menus as well as offering fast inspection and product set up, automatically optimising the systems for each product type allowing you to learn and switch within minutes.

X-ray systems also offer the ability to detect bone, glass, ceramic or stone and dense plastics whilst also checking for product integrity, making it the complete solution in contaminant detection.



Checkweigher FAQ's



减少450克包满溢的gram, on a line producing 200 packs per minute running 16 hours a day for 230 days a year, would result in you saving enough raw materials to make an additional 98133 products.