The Ability to Grasp Wastewater Treatment

In the 1800’s there was a disease called Cholera Pandemic, it was uncontrollable and no one, not even doctors could establish its origin. It killed over 23,000 people just in Britain.


30 years later the world was taught by a French biologist, microbiologist and chemist ‘Louis Pasteur’, how microbes could move through the water sources, causing them to carry the deadly disease.  Following this, the world did try to make a difference by inserting filtration systems that were put into practice, however this sadly became unsuccessful due to the water containing a variety of contaminants.


It became known that by allowing untreated wastewater to flow into the rivers was the cause of the Cholera Pandemic disease in the 1800’s. So today the chemical chlorine is used on the wastewater to ensure the water is clean before being distributed.

Today it is extremely unheard of for anyone to become ill from contamination, this is due to the increased level of technology we have, which ensures the wastewater can be safely moved to rivers. With today’s chemicals and improved specialised equipment, it means there are multiple procedures we can follow to ensure there is no contaminated water.

ChemTec, one of our partners, specialise in manufacturing flow monitors for wastewater companies.

The Equipment

These flow monitors and meters have been engineered in a way that can produce a unique effect on the cleansing of wastewater. The feeding system for treating the water use chemical dosing.

The flow rates of the water can fluctuate; therefore, we can tailor our products to your needs. There are three main types of equipment that these are mainly used on; non-adjustable FS series, the adjustable LCA series and the MAO series flow meters - they are available in PVC, Brass and 316 Stainless Steel to reduce corrosion resistance.

The FS models will accept flows between 0.25 to 8.50 GPM, the LCA models will take 0.1 – 15.0 GPM and the MAO 125/250 and MAO 500 0.32-28.53 gallons per hour or 1.89 – 13.25 gallons per hour.


The Process

In a cleansing system, the wastewater has chlorine gas administered into it, it then relies on the current of the water. If the current is moving at a fast pace it pulls in the gas and this mixes together so the water is disinfected thoroughly.

The water current must be moving fast enough to ensure the chemicals mix with the water properly to ensure it is disinfected. The system relies on this so our flow monitors and meters may be used.

The water filtration system includes these monitors. They are used to ensure that the current of the water is consistent and can signal an alarm if it sees a change.


In a Nutshell

Since the 1800’s, because of the process and equipment explained above, we now have a clean water supply and no nasty diseases going around. However, the goal is to always go above and beyond by improving and perfecting the equipment to enhance the filtration systems keeping the world safe.


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Or, get in touch with us today to learn more about these products.

Flow Monitoring: Beer and Brewing

At the last count in 2017, there were over 2,000 breweries in the UK. The revolution of craft beer has seen Britain become a ‘brewing powerhouse’ as there are 64% more breweries now than there was five years ago.

Brew pubs (brewed and sold on site) are becoming increasingly popular in the UK and the USA so customers can enjoy the homemade taste of ale on-site. Pubs, craft breweries and microbreweries together are no-doubt making millions of bottles filled with traditional and innovative brews.


Production of Beer

The flavouring and boiling processes are just as important as the brewing. The flavouring, hops, goes into a wort made from grain and is boiled into a liquid. After it has rested, this liquid gets put into the chiller, fermented and put into storage. This process takes place in a maze of pumps and piping attached to large stainless steal tanks.

Cleanliness is always vital when brewing beer. Steam and other methods are used by brewers on their equipment to ensure no batches go to waste from contamination. It’s always good to be an obsessive cleaner at a brewery! 


Bottling Beer

Bottles are washed and sterilised before receiving their 330ml of beer that is delivered from a foam free rotary device. This device is connected to the steel pipes of the holding tanks.

Very similarly to the brewing process, cleaning of the equipment needs to happen regularly; no one wants to be drinking a lousy bottle of beer!

beer brewing


Why are monitoring flows important?

Careful regulation of time and temperature are governed by the rate at which the liquid flows through the system – this plays a big part in creating that perfect bottle of beer. Stalls and blockages will expose the product to temperatures that are too high or too low and will give unwanted effects to the ale. From the reduced flow, pumps may be damaged and overflows may arise elsewhere; it can also cause under-filled bottles.

Flow monitors

Flow monitors are registered to perform target flow rates. If the flow is obstructed, the monitor responds to this with an alarm signal. A warning light, lamp or a shut down pump could be used to avoid any damage to equipment or the product.

One of our key partners, ChemTec, manufacture flow monitors. These devices are simple but effective, like those in the FS and LPH ranges. A small magnetic piston is suspended in the flowing liquid. A sensor outside the stream detects the change in position resulting from a drop or increase in flow.

There are also devices called excess flow valves that are designed for more extreme cases. For example, if an uncontrolled release occurs or if a pipe is broken, the valve will shut off the flow completely. Excess flow valves can help protect breweries against mistakes and accidents.


Specialist technology

Every fluid concerned has a solution that is tailored to it’s needs, making flow monitoring a very unique and specialised area.

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A new client, who are one of the leading companies in the aerospace and defence market across the globe, contacted us for assistance in designing a bespoke solution for controlling their on-site air and water supply feeds.  

Each special control box consisted of pressure reducing regulators fitted with gauges, relief valves, flexible hoses and tube fittings to act as a “plug and play” solution.



We were successful because we offered the client our one-stop solution – to design, procure, assemble, test and supply the pressure control boxes according to the customer’s exact specifications, all in-house at Boiswood HQ.

We also offer a range of other services to our customers; including testing, assembling and repairing pressure regulators, component sub-assembly design and supply, site installation surveys and product training seminars. Learn more about our customer services here.

We will take the headache and hassle out of your projects, so rely on us to specify, supply and support all of your gas and liquid control requirements. If you think we can help you, contact us today.


What Is Boiswood?

Boiswood has been a respected & leading supplier in gas and liquid controls since it was established in 1989. Starting the business in Chesham Bois, Buckinghamshire with the woodland alongside the office called ‘Gt Bois Wood’, the name ‘Boiswood’ was born.

Tony, who created the business along with 2 other guys several years ago, carries the company to this very day. Tony bought the shares off of his two fellow business partners as they pursued other interests. Luckily for Tony, Boiswood is a company that has achieved many goals and continues to each day, with new and loyal customers from the most advanced manufacturing facilities. With the pace Boiswood is running at, the company will have tripled by 2020!

Since 1989, Boiswood have continued success built on their own company core values. These are: Continuous Improvement, Customer Focus, Integrity, and Respect.

Every day you can improve on tasks/projects you have done daily for years. Boiswood keep an open eye on learning from one another; whether it’s a new strategy on service or even how to make better cup of tea!

Focusing on the customer is key. At Boiswood, customers are guaranteed satisfaction. With the company aspirations and targets, the Boiswood team work together like clockwork to assure the best customer experiences.

Boiswood is supported by a team who are driven by their integrity to succeed in every task they are given. Doing the right thing for themselves, the customers and their fellow colleagues; the individuals who work for Boiswood never cease to come through strong!

Respect is a very important value. Respect for the customers, colleagues, work environment & for yourself. Tony, being brought up with this value, has implemented it within business, creating morals and grounds for everyone to stand on.

All Boiswood employees abide by these core values. This makes a calm, organised, enlightened company that looks after their customers with the utmost respect.

The Boiswood team are always ready to take on new customers who are interested in their range of products. They offer products in 6 different categories. Pressure/vacuum, flow, level & temperature, tube & fittings, HVAC/R and custom service. These categories have hundreds of different types of engineering and mechanical goods!

Being a professional business who supply products for the UK’s most advanced manufacturing facilities, Boiswood cover a wide territory across many markets such as; chemical, HVAC, oil & gas, power, cryogenics, food & beverage, renewable energy and semiconductor. Being versatile in what they can offer, Boiswood are definitely one of the best for the control of gases and liquids!

Selecting an Excess Flow Valve

An excess flow valve (EFV) is an automatic shutoff valve through which pressurised gas or liquid flows, and it is essential for many pipeline applications. They are designed so that at normal flow rates the fluid will pass through unrestricted, however in the event of an dramatic increase of flow it will trigger the EFV to quickly close off the flow.

Check out our guide below to find out what information we will need in order to size your excess flow valve: 



It is general practice to have the outlet pressure range of a regulator able to reach it’s maximum potential. The maximum outlet pressure of a regulator is often determined by the internal diaphragm and range spring. These are selected based on what outlet pressure range was originally specified for the regulator.

If you're looking to restrict the outlet pressure of a regulator, follow the simple steps in the below guide:



The ATEX Directive 94/9/EC controls all manufacture and import of equipment for use in explosive atmospheres, including non-electrical items. ATEX requires that the equipment be safe and bear a label indicating the conditions under which it is approved for use. 

Please take a look at our ATEX Explained brochure for more information:



The Setra FLEX™ provides a flexible room environmental control and monitoring solution in a simple-to-use package. An attractive flushmount faceplate is complemented by an intuitive graphical display to meet any architectural requirement. The unit supports 3 rooms, monitoring up to 6 parameters for each room. If additional I/O is required, an expansion I/O module enables the monitoring and control for more complicated applications. An optional differential pressure sensor can be either factory-installed in the unit or ordered separately and installed above the ceiling. Integration with building automation systems is made easy through either BACnet/IP or BACnet MS/TP network protocols.

The Power Battalion 48 is a multi-circuit, revenue grade power meter designed to significantly reduce installation time and cost per metering point. The Power Battalion 48 can be used with standard CTs, 1 Volt output or less, or with Rogowksi style CTs to monitor any combination of up to 16 three-phase or 48 single-phase loads. The versatility of the device allows monitoring of two separate voltages and transformers on same meter simultaneously. The Setra power meter provides ANSI C12.20 accuracy on all circuits being metered.



Boiswood offer a broad range of configurable pressure transducers providing accurate measurement for all of your HVAC/R application needs. We supply top-quality, low cost and easy-to-install products for general HVAC, critical environments, energy monitoring and building management systems – always keeping in mind your efficiency requirements and profitability standards.

We will be exhibiting at stand C38 at the HVAC & Refrigeration Show at the ExCel London. Come and visit us on the stand to check out our vast range of industrial and differential pressure transducers, room condition monitors and power meters. 




Boiswood are now distributing in the UK for H+ Valves, a well-respected manufacturer of safety valves and sampling systems that meet strict demands of industrial process. We can offer a vast selection of process and instrumentation safety relief valves - from a standard "ex-stock" range or customised to your specification. 

We can propose a safety valve suitable for your application, sizes from 1/4" to 8", in Stainless or Carbon Steel, threaded or flanged - whatever your specific needs contact us today. 

All safety valves come with a technical documentation package consisting of maintenance/seating instructions, declaration of conformity to PED & ATEX, material certification and capacity calculation - all free of charge. 


Please advise us the following operating parameters:

  • Cracking/Opening Pressure (BARG/PSIG)
  • Material of Construction (Preferred)
  • Connection Size and Type (Preferred)
  • Media (Gas or Liquid)
  • Flow Rate of Media
  • Temperature of Media





Boiswood were asked to design, source and assemble the above pressure let down panel. 

Both panels consisted of 3 pressure reducing regulators and 6 ball valves each. The regulators were mounted directly to the back panel and then connected with a ball valves on both the inlet and outlet side. 

This allowed the customer to pipe the panels as seen straight into their system and connect up to their bottle cylinders.  



With the global biogas market estimated at £1trn and energy security, climate change and the UN Sustainable Development Goals driving the need to rapidly increase the uptake of biogas, UK AD & Biogas and World Biogas Expo 2017 is the place to come to find out why and how. Taking place on the 5-6 July at the NEC in Birmingham, it will be the show’s seventh consecutive year and will consolidate its position as the #1 global trade show for the biogas industry.

This year the show will benefit from its new partnership with the World Biogas Association (WBA) to showcase the global biogas industry at ADBA’s leading event, which last year was attended by participants from over 50 countries.

Exhibitors throughout the combined event will be showcasing all the products and services required to commission, build and operate all types of biogas plant, including agricultural, commercial and sewage treatment plants. The show will also cover for the first time landfill gas and food waste collection systems, as well as everything needed for heat and power networks, and using biomethane in transport.

Come and visit us on stand G204 and check out our range of condensate traps for biogas lines:



GO Regulator Assembly

Assembly & Testing

At Boiswood we stock a wide variety of components to assemble Pressure Reducing and Back Pressure regulators. From the GO product range we can generally assemble the PR1, PR2, PR7, PR50, BP3, BP8 and BP60 models to your required specification from stock.

We would then pressure test the assembled regulators using our Nitrogen gas bottle to ensure they are functioning correctly. We can provide a copy of the pressure test certification on request.

With this considered, it means you could have your regulators assembled, tested and despatched on a next-day service, after the processing of your order.

Servicing & Repairs

In order to comply with the BCGA's recommendations of servicing/replacing regulators after a 5-year operation period, many users call on Boiswood to service their GO regulators.

Whether you require repairs for a faulty/broken regulator or just a general service - We will quickly turnaround a detailed corrective action report and recommendation for any spare parts. We can help to diagnose the causes as to why the regulator may have failed in service, always with the objective in mind of lowering your costs.

Again all regulators are assembled and pressure tested before they are returned to you.

GO Regulator Repairs

GO Regulator Subassemblies

Subassembly Design & Construction

We will work closely with you to provide component subassembly and panel solutions suitable for your application.

Looking at the example to the left, we will take your required specification and produce a solution for you to sign off on. From there we can gather all of the necessary components and begin to create a suitable subassembly for your application.

Whatever your requirements contact us today for technical consultation.


1. Electro-Optic
The electro-optic type level sensors utilise their infrared LED light and receiver to detect. The LED is positioned and directed into a prism
which forms the tip of the sensor. As soon as the media (liquid) touches the prism, it disrupts the light and senses the change. This change 
can relay to an electronic switch (ie. actuating an alarm or circuit). 


2. Ultrasonic
The ultrasonic type level sensors have no moving parts and require absolutely no maintenance.  It offers an alternative to the generic 
reed switches and are ideal for applications where foam and condensation could affect the sensor. The ultrasonic pulses emitted reflect
off liquid surfaces and the gap area therefore detects its presence or absence.  


3. Capactive
The capactive sensors are specifically calibrated to each medium, in order to account for a number of variables. They can be used on aqueous
and non-aqueous fluids regardless of transparency or colour. Once the factory preset or customer-set trigger point is actuated, the sensor
can then switch to the required output. 


4. Float
The float sensors operate on perhaps the most common and simple principle on the market. As the float rises or lowers, the magnetic field actuates the

encapsulated reed switch to its required setpoint. Depending on design these can be mounted vertically or horizontally. 


5. Radar
This is also referred to as guided wave radar or guided microwave. Very similiar to the ultrasonic principle of operation, except these pulses can
travel up to the speed of light. This provides a very high accuracy and repeatability for the users. 


For more information on the displayed products, click on an image to go to the product page. 


The Model 209H pressure transducer is designed for customers who require high performance, reliability and versatility in harsh applications.

The Model 209H features all 316L stainless steel wetted materials, ideal for the demanding requirements of the alternative energy and industrial market.

The sensor offers many pressure and electrical connections to satisfy challenging installation requirements.

The 209H is available with a patented overpressure stop to protect the transducer against unexpected spikes or in high pulsation applications.


Model 209H Features:

  • Rugged 316L SS Construction -The sensor and all wetted material of the 209H are manufactured using a 316L stainless steel, enabling the sensor to stand up in corrosive applications.
  • Flexibility For Many Applications -The Model 209H transducer offers many pressure and electrical fittings, covering many installation configurations. The units non-oil filled design makes it ideal for the alternative energy market
  • Accurate and Reliable -The Model 209H is designed and built to withstand demanding applications. The unit comes standard with an accuracy of ±0.25% FS across a wide pressure range offering, providing high performance at a low cost.


Setra’s new Model 209H is designed with all 316 stainless steel wetted materials eliminating the risk of hydrogen embrittlement. The transducer is offered in a variety of pressure ranges and electrical fittings to meet a wide range of installations and applications.

Hydrogen embrittlement is the process a material goes through when it comes in contact with forms of hydrogen. This process causes the material to lose ductility, making the material brittle and prone to the propagation of fractures and cracks in the material. These cracks may allow hydrogen to pass through a diaphragm or surface into the sensor or surrounding area posing potential safety risks as well as contamination of the system.


Click Here to view the datasheet





What are the different types of pressure transducer?

Chemical Vapour Deposition

The Chemical Vapour Deposition method involves bonding a polysilicon layer to a stainless steel diaphragm. This is done at the molecular level to produce a sensor which then has a superior long term drift performance. Semiconductor manufacturing processess are used to create a polysilicon strain gauge bridge with superior performance at a very cost-effective price. Chemical Vapour Deposition units are the most popular sensor for OEM applications construction as they can offer excellent price and performance.

Take a look at a CVD pressure transducer: - Click here


The Capacitance Type is used for a large variety of high volume OEM bespoke applications. Measuring capacitance change between two surfaces allows for transducers to detect very low pressure and vacuum levels. Their extremely robust construction lets capacitance units to be used in a huge range of applications. They offer great price and performance benefits.

Take a look at a Capacitance pressure transducer: - Click Here

Sputtered Thin Film

Sputtered film deposition creates transducers with maximum combined linearity, hysteresis and repeatability. These types of units allow for extremely high full scale accuracy and very low long term drift. Accuracy is as high as 0.08% full scale with long term drift as low as 0.06% full scale per year. They are most commonly used in critical applications where precision is a must-have.

Take a look at a Sputtered film pressure transducer: - Click Here

Micromachined Silicon (MMS)

MMS transducers use micromachined silicon (MMS) diaphragms to sense pressure changes. The silicon diaphragm is protected from the process media by an oil-filled 316SS isolation diaphragm. MMS transducers are manufactured through common semiconductor techniques. These units off a great proof pressure, linearity and stability.

Take a look at a MMS pressure transducer: - CliCk Here

Examples of Pressure Transducer Applications and Industries:

  • Test & Measurement
  • Gas Compressors
  • HVAC Systems
  • Medical Instrumentation
  • Weighing Systems
  • Silicon Wafer Manufacturing
  • Tanks & Vessels
  • Automated Manufacturing Equipment
  • Wind Tunnels

For technical support on your application, get in touch with us today.

To view our full range of transducers browse in Pressure & Vacuum categories


As of 1st September 2016, Boiswood has been an official distributor for Eurovacuum High Vacuum Products. We are a leading UK engineering business for high quality pressure, flow, level and temperature products supplying to many of the UK's best manufacturing facilities such as Diamond Light Source and Rutherford Appleton Laboratory.

We will represent Eurovacuum Products complete line of high vacuum products, which is constantly being upgraded and expanded.

For further information on the range of high vacuum products, click here.


Sinking and sourcing are terms used to describe how a load (the device being turned on or off) is powered in regards to the sensor.

Sinking is the most common and it involves the switching of load current (power) supplied by a power source external to the sensor. With this configuration, current passes through the load first, through the output switch of the sensor second and finally to ground. Sensors with sinking output switches the negative leg of the circuit.

Sourcing refers to a configuration in which the sensor is the source of the current required to power the load. In a sourcing situation, current supplied by the sensor passes through the load second and then to ground. Sensors with sourcing output switches the positive leg of the circuit.

Wet sink - The load is energised as long as the sensor tip is immersed in fluid.
Dry sink - The load is energised as long as the sensor tip is dry (not immersed in fluid).






EFV Manual Reset Series


  • Positive shut off with internal reset mechanism
  • Field Adjustable
  • Resets Manually
  • Materials: 316ss or Brass Body Standard
  • Detects Excess Flows
  • Detects an Increase in Viscosity of Media
  • Function: Shuts Off Flow
  • Output: Switch Contact (Optional)


 Click on the PDF Icon to view the datasheet





Boiswood is now distributing Kobold product.

The KOBOLD Messring GmbH is one of the leading international instrumentation engineering enterprises specialized on monitoring, measuring and regulating the physical quantities of flow through, pressure, level and temperature.

Boiswood are looking to display select Kobold products on this website by January 2017.

To enquire directly about the Kobold range, please fill out the form here



Setra’s Model 267 is the most rugged high accuracy, low differential pressure transducer on the market. It delivers accuracies of ±0.25%, 0.4%, 0.5% and ±1% FS and pressure ranges from 0.1” W.C. up to 100” W.C. The 267 is housed in a robust, NEMA 4 rated enclosure and has an optional static pressure probe reducing installation and material costs. The 267 is offered with an optional LCD display and a standard accuracy of ±0.5% making it ideal for high accuracy Pharmaceutical applications.

Customisation is Standard

The 267, unlike most competitors, offers many mechanical and electrical options that can be integrated into existing designs. The optional 0.25” diameter pressure probe is made of sturdy extruded aluminum and is designed with baffles to prevent velocity pressure errors which saves money and reduces time on the job site.

Robust Enclosure for Difficult Applications

The 267 is housed in a NEMA 4 rated housing and is built to withstand harsh environments. The 267 is available in both
wall and duct mount providing the installer with flexible mounting options. The wall mount allows the sensor to be installed anywhere, whereas the duct probe configuration is designed to maximize space efficiency in difficult applications.

The Setra Sensor

The core technology of the 267 is the all stainless steel capacitive sensing element. Setra designs and manufactures all of their sensing elements resulting in full control over the process and quality of every single sensor. The welded dead-ended capacitive sensors requires minimal amplification and delivers excellent accuracy and longterm stability. Setra’s technology has been used in over 8 million installations and has the highest field acceptance rate in the industry.




Advanced ultrasonic level sensing technology

Uniquely designed to reduce customer downtime, the rugged and compact XLS-1 with microcontroller has no moving parts and reliably senses oil, water and harsh chemicals while ignoring foam and condensation.

Multiple thread options

The XLS-1 product line offers six (6) standard thread options for ease of installation. The multiple thread options reduces design constraints and enables customers with complex systems to avoid lengthy design changes.

Moisture protection reliability for indoor and outdoor applications

In addition to meeting IP67, Gems XLS-1 meets IP6K9K – a more stringent requirement for high-pressure/ high-temperature wash downs. The industry leading IP standard reduces customer worry about moisture ingress in tough environments.

Extensive pretesting reduces engineering cost and time to market

The XLS-1 comes pretested to industry-leading load (15 G), temperature (-40°F to 257°F/-40°C to 125°C), vibration (10 to 2000 Hz) and pressure (250 psi with capability up to 500 psi – consult factory) standards to reduce your overall product testing.

The recently launched XLS-1 ultrasonic level sensor has quickly become a popular option for customers looking to improve equipment uptime, replace obsolete sensors, reduce warranty claims and limit the number of sensor variant stock needed by their customers. Please see below our demonstration video:






These are pressure reducing, diaphragm-operated, spring-loaded and balanced proportional valves for high flow rates. The valve body is made of cast steel, the internal parts are of CrNiMo steel. The valve cone is soft-sealed (up to 130 °C) for liquids and gases or with metallic seal for steam (up to 250 °C). Self-acting pressure reducers are simple control valves offering accurate control while being easy to install and maintain. They control the pressure downstream of the valve without requiring pneumatic or electrical control elements. Technical details as below:


                     DM618                                                                    DM618Z

 Click on the PDF icon to view the datasheet                                          Click on the PDF icon to view datasheet

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