Sensorex Offers Drop-in Replacement for Acu-Trol® pH and ORP Probes

Direct fit replacement probes with improved construction and chemical resistance

Sensorex’s S465 series probes offer an alternative to Acu-Trol® pH and ORP probes used in swimming pool control, industrial, municipal and potable water applications.

Sensorex’s S465 series probes

Sensorex’s S465 series probes

The S465 series was designed expressly as a direct fit replacement for existing Acu-Trol pH and ORP probes. Constructed of durable PPS, S465 probes offer improved chemical resistance. Additionally, Sensorex uses a higher volume of its proprietary polymer sensor reference gel for longer service life. Sensorex’s advanced sensor technology delivers accurate measurement over a range of 0-14 pH or -1000–1000mV for ORP. The probes are suited to a variety of applications with a temperature range of 0-80°C and a pressure maximum of 100psig (standard de-rating applies).

The threaded ½” NPT connection enables easy in line installation or use with existing Acu-Trol flow cells without modification. Advanced signal shielding reduces noise for more accurate communication with process control systems. Both the pH and ORP probes are available with a BNR connector for quick integration into existing systems.

To learn more about the S465 series and the company’s full range of sensing products, visit, email, or phone +1 714-895-4344.

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Optical Beam Smoke Detectors: Getting the Best from Beams

Efficient and effective wide-area fire detection
Large, wide-area indoor spaces present a challenge to traditional fire safety systems: in order to effectively detect smoke over such a space, complex networks of multiple overlapping sensors will be required.  Optical beam smoke detectors, on the other hand, are designed exactly for such situations – one single unit installed on a wall can detect smoke over an area of up to 1500m2 (BS5839) or 19,800 sq ft (NFPA 72).  More coverage per detector means fewer detectors, with associated reductions to the time and cost of installation and wiring, as well as a lesser aesthetic intrusion.  Mounting on the wall as opposed to the ceiling enables convenient access for maintenance, and a low-level controller further speeds and eases the process.  A space which might need as many as 15 point detectors could therefore be maintained from one single low-level controller, as opposed to organising height access to 15 different spots.

There is already a lively debate about the relative merits and drawbacks of different detection systems.  A common theme is that beam detection may not be as reliable or trouble-free as other methods, however this is almost always due to incorrect installation.  Beams, in fact, can be much more suitable for some situations than other detection systems, and this article will explain how to get the best from beams.

Optical Beam Smoke Detectors

Optical Beam Smoke Detectors

How it all works

Let there be light
An optical beam smoke detector works on the principle of smoke particles interfering with the transmission and reception of a beam of infra-red (IR) light.  A transmitter sends out a beam of IR light, and a receiver a set distance away measures the amount of IR light received.  When smoke enters the beam’s path, the intensity of IR received is reduced; when this reduction reaches a pre-defined limit the alarm signal is triggered and sent to a fire control panel.

Most beam detector systems consist of a transmitter, receiver and control unit.  The transmitter projects the beam, the receiver at the ‘end’ of the beam measures its intensity with a photosensitive sensor, and the control unit analyses and interprets the signal before communicating the detector’s status to a fire control panel.  These three elements can either be entirely separate or completely integrated, depending on the system chosen.  When the transmitter and receiver are in the same unit, a prismatic panel is fitted to the opposite wall where the receiver would normally go, reflecting the beam back to the source – and further reducing wiring requirements.

A good visual analogy is a torch beam of visible light: the beam expands outwards in a cone, its intensity dropping with distance from the central axis.  Beam detectors essentially detect how much ‘darker’ the end of the beam has become due to smoke interference.  In a torch light, as with IR, beams can cross without scattering, which is what allows reflective beam systems to function.  IR light is used as it is significantly affected by both smoke particles and the heat haze of a fire, and is invisible to the human eye – somewhat less intrusive than an actual torch beam.

Combating common problems
A minor, gradual increase in obscuration is not typical of smoke interference, but might well be due to dust and dirt build-up on the active surfaces.  Software in more advanced beam detectors can detect this slow change, and increase the gain (a form of signal amplification) to automatically compensate for this.  By contrast, sudden and very high beam obscuration is almost certainly a solid object in the beam’s path, and will trigger a ‘Fault’ status so that the path can be cleared.  In this way, ‘intelligent’ beam detector systems are able to perform accurately and effectively over a long period of time and with minimal manual maintenance.

Types of Beam detectors and their specific advantages

End-to-End vs. Reflective
As their names suggest, and has been touched upon already, there are two fundamental types of beam detectors.  End-to-end systems have the transmitter and receiver on opposite sides of the area to be protected.  They can be up to 100m apart, and the receiver can be connected to a control unit installed at ground level for easy maintenance.  Reflective systems have the beam transmitter and receiver in the same housing (a transceiver), with a reflective plate on the opposite wall.  This can still be up to 100m away, and the plate is prismatic so that it will reflect the beam straight back even if it is not mounted perpendicularly to the transmission path.

End-to-end systems are relatively unaffected by stray reflections from surrounding surfaces and obstructions near the beam path.  A reflective system, although potentially susceptible to objects near its line of sight, is easier to install and requires less wiring as power is only needed by the single transceiver unit.  Essentially, end-to-end beam detectors can operate effectively through narrower ‘gaps’, and will often be more suitable in more confined areas or those with many obstructions (‘busy’ roof spaces for example).  For spaces where this is not an issue, reflective systems will usually be more convenient.

Very recently, technology was also developed that allows the use of multiple transceiver heads running on one single controller.  This enables cost-effective protection for larger areas, and improved coverage options for unorthodox indoor spaces.

Motorised vs. Manual Adjustment
New developments in beam detection technology have led to a choice between inexpensive simplicity and intelligent automation.  Traditionally, adjusting the beam’s power and direction would have to be performed manually at the time of installation, and then maintained over time to compensate for dust build-up and ‘building shift’.  This is where building elements can gradually move in very slight increments, affecting the beam’s aim and effectiveness.  Recently, the option has become available to choose automated, motorised beam adjustment.  This technology uses data from the unit over time to automatically adjust its direction and sensitivity to keep the beam accurately aligned and the signal at an optimum level.  This is fast, reliable, and eases installation as well as reducing both the need and time taken for continued maintenance.

Beams vs. Other Detectors

The right tool for the right job
As already mentioned, by their nature beam detectors cover a huge area, and thus require less units and wiring than other detector types, but there are other things to consider as well.  Beams are less affected than other types of detector by high ceilings, harsh environments and airflow blowing smoke away.  As a smoke plume rises it becomes less dense, which leads to a maximum operating height for point detectors since the particle density can fall below the alarm threshold.  Since a beam operates over a linear path, the density of the plume has no effect – only the total number of smoke particles in the beam path.  As the plume widens, it involves more of the beam, making beam detectors more effective as height increases compared to other detectors.

Blowing smoke
Similarly, airflows that might blow smoke away from point detectors’ tiny sensor chambers are going to have less effect on the long, wide detection pattern of a beam system.  Dust and dirt build-up is taken care of by automatic beam signal strength compensation, and extreme temperatures have relatively little effect on the technology – there are even beam detectors suitable for use in explosive atmospheres.

A related, but separate problem can occur when a rising smoke plume draws in surrounding air and cools rapidly as it rises, sometimes actually becoming colder than the air above it.  In this situation, most commonly seen in high-ceilinged spaces, the smoke spreads out below the layer of warm air, as though trapped under an ‘invisible ceiling’ of its own.  This is known as stratification, and it can render ceiling-mounted detectors ineffective due to the lack of smoke particles reaching them.  A typical solution to this problem involves installing supplementary detection at lower levels to detect the stratified layer or even the plume itself.  Beam detectors are wall-mounted, typically up to 600mm below ceiling level, thereby giving them a significant advantage in detecting stratification layers.

Breathe easy
High Sensitivity Smoke Detection (HSSD) or aspirating systems are another option for large indoor spaces, however they suffer from their complexity and installation requirements.  A network of end-caps, sampling pipes, brackets, elbows and labels must be designed, fitted and maintained, which can be costly and inconvenient.  The aspirating pipe itself can also be quite obtrusive, and hiding it requires yet further cost and complexity from installing capillary tubes and drilling into the ceiling.

Getting the best out of Beams

Golden rules for a successful installation
As with almost all technology, an optical beam detector will work much better if it is properly installed and maintained.  Most reported and ‘common knowledge’ problems with beam detection actually stem from improper installation and usage, but can be easily avoided by following some basic rules coupled with common sense.

A Stable Base
Figure 1: A good stable fixing surface

A good stable fixing surface

A good stable fixing surface

Beam detector elements must be mounted on rigid, stable surfaces to limit the risk of misalignment: as with a torch, a tiny change in the transmitter’s angle will cause a large movement at the other end of the beam.  Common problems come from mounting beams on potentially flexible building surfaces such as cladded walls or on free-hanging assemblies.  Even building purlins can move, particularly subject to ambient temperature changes causing contractions and expansions, so are not recommended as stable fixing points.  So, if direct mounting onto brick or block walls is not possible, it is recommended that beam components be installed onto secure, rigid metal-frame assemblies suspended from RSJs (rigid steel joists).

Reflection Perfection
Figure 2: Obstructions can impair reflective beam systems

Obstructions can impair reflective beam systems

Obstructions can impair reflective beam systems

Reflective optical beam detectors can be affected by objects or surfaces close to the line of sight between the beam and reflector.  Obstructions will not only interfere with the received signal, cutting the IR intensity, but could leave areas hidden by their ‘shadow’.  If an obstructive surface were mistakenly used for alignment during initial installation, it would leave the area behind it completely unprotected.  Confirming correct alignment is therefore vital, with cover-up tests of the reflector a sound method for ensuring that the whole area is properly protected.

IR Interference
Figure 3: Correct ‘back-to-back’ transmitter placement

Correct ‘back-to-back’ transmitter placement

Correct ‘back-to-back’ transmitter placement

Beam receivers should always be positioned to avoid other sources of IR light.  In the first instance, where multiple beam detectors are in effect, each receiver should only have its associated transmitter’s beam falling on it.  If it is within the beam of another detector system, ‘crosstalk’ can occur producing false ‘Fire’ and ‘Fault’ conditions.  If two systems must be daisy-chained to cover a long distance, the transmitters should be mounted back-to-back rather than the reflectors or receivers, so as to minimise interference.  Other strong IR light sources, such as direct sunlight, can cause IR saturation whereby – much as with the human eye – it will be too ‘bright’ to function properly.  Normal fluorescent lights emit very little IR light, though incandescent bulbs, sodium lamps and camera flashes emit more; beams should be positioned to avoid such stray light falling directly onto the receiver.

Standards such as EN54-12 and UL268 dictate the design and construction of optical beam smoke detectors.  It is important to note, however, that beam installation is governed by the relevant National Code of Practice.  Codes can vary by territory in their definition of the accepted width of coverage of a beam, and its allowable height from the ceiling.  The operating range (linear distance) for a beam is dictated by the manufacturer’s design and the approval gained for each beam detector product.

Things that go ‘bump’ in the night’
One last, occasional concern is that various ‘creatures of the night’ – bats and owls, usually – might set off false alarms by flying along the apex of a gabled or pitched roof.  Although this could conceivably be a problem, some beam detection systems can have a delay timing set.  This would then only send a fault or fire signal after that condition had been registered for a certain time – long enough for any flying trespassers to flit away again.


Light at the end of the tunnel (and warehouse, hangar, auditorium…)
This article has explained the mystery of optical beam smoke detection, its viability and benefits, and how to get the best out of it.  In short, beam detectors are an excellent option for wide-area smoke detection, covering much larger areas than point-type smoke detectors and with minimal wiring requirements compared to smoke aspirating systems.  Different beam systems are available to suit different projects, depending on issues of cost, wiring and space.  Possibly the most important point though is that even the best technology in the world is worth nothing if it is not used correctly, so following the golden rules for installation is vital for safety and success.  Bearing this information in mind, optical beam smoke detection can – and should – be considered a leading light in fire protection systems for large indoor areas.

Jon Ben is Technical Director at Fire Fighting Enterprises Ltd.  His role includes responsibility for all product development, technical support and product training in the field of optical beam smoke detection.  Jon has over 25 years experience in highly regulated manufacturing industries and has brought many world-class products to market in the defence, industrial, medical and fire sectors.

Product Spotlight:
The Fireray 5000 optical smoke beam detection system from Fire Fighting Enterprises is at the forefront of wide-area fire protection technology.  It is uniquely easy to install, featuring a visible laser alignment aid for initial setup and motorised, automatic optimisation to keep the beam on-target thereafter.  This, in addition the low-level controller unit, eliminates the need for expensive and risky maintenance procedures at height.

The Fireray 5000 optical smoke beam detection system from Fire Fighting Enterprises FFE

The Fireray 5000 optical smoke beam detection system from Fire Fighting Enterprises FFE

The Fireray 5000 Multi Head System enables up to four beam detector heads to be connected to and managed by a single low-level controller unit, improving efficiency of setup, wiring, and coverage of unorthodox indoor areas.  A full suite of installation accessories are also available, including mounting brackets and protective cages for all parts of the system.

The product has approvals and certification from regulatory bodies around the world, including FM Approval, LPCB, CPD and UL amongst others.  A full list can be found at:

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Labsphere Expands Light Measurement Software Compatibility

Integral® supports equipment from a range of manufacturers, now including Instrument Systems’ CAS 140 spectrometer

Labsphere’s Integral® Light Measurement Software collects, analyzes and accesses data from Labsphere systems and hardware as well as components from other manufacturers used for solid state light testing. The next generation, Integral 1.2, now supports a wider range of instruments common in photometry laboratories, including Instrument Systems’ CAS 140 spectrometer.

Labsphere Integral Light Measurement Software

Labsphere Integral Light Measurement Software

High res photo:

Integral increases efficiency in laboratory and production environments by enabling a single user to manage the workflow of multiple light measurement systems. The system controls and automates testing and reporting of results for electrical, thermal and optical performance of solid state lighting.
Integral now supports AC and DC power supplies and power meters from Keithley Instruments Inc., Agilent Technologies, Chroma Systems Solutions, Inc. (including QuadTech), Yokogawa Electric Corporation, and XiTRON Technologies. It also supports temperature monitoring and control devices from OMEGA Engineering inc., and Arroyo Instruments. For optical measurements, Integral supports all of Labsphere’s spectrometer products and now with the upcoming release of Integral 1.2 will support the Instrument Systems’ CAS 140 spectrometer.

Integral eliminates the need to install the software on computers or mobile devices. It runs seamlessly on the supplied Labsphere Cube (a small form-factor PC acting as a server) and can be accessed globally from multiple devices. Integral is included with Labsphere’s illumia®plus product line and supports functionalities such as LM-79 electrical and IESNA LM-82 testing.

Optional API capabilities allow customers to adapt the software to match their unique requirements. Labsphere plans to continue expanding the list of supported test and measurement equipment in future releases of Integral.
For more information, contact Technical Sales at +91 98209 32299, email, or visit

*The CAS 140 spectrometer is a product of Instrument Systems GmbH. No affiliation, endorsement or sponsorship is stated or implied.

For further information please contact:
Makarand Wadhavekar
Labsphere India Sales Manager
Halma India
B1-401 Boomerang, Chandivali
Andheri (East), Mumbai 400072.
Tel: +91 22 6708 0400, Fax: +91 22 67080405

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Alicat Develops First Bidirectional Flow and Pressure Controller

MCD-Series dual-valve mass flow controllers increase experimental possibilities

Alicat Scientific, Inc.’s new MCD-Series Bidirectional Mass Flow and Pressure Controllers precisely and rapidly control mass flow rate, volumetric flow rate and absolute pressure of gases in two flow directions. This flexible dual-valve design is the first of its kind, allowing researchers to replace multiple dedicated instruments and make rapid changes to experimental setups.

Alicat Scientific MCD-Series Bidirectional Mass Flow and Pressure Controller

Alicat Scientific MCD-Series Bidirectional Mass Flow and Pressure Controller

User-selectable control modes allow users to switch quickly between mass flow, volumetric flow and absolute pressure measurement and control for maximum flexibility in laboratory use. With a dedicated inlet valve and a dedicated exhaust valve, a single MCD can control upstream and downstream flows, as well as positive pressure or backpressure in both open and closed systems. As a universal control element, it can be used to monitor or control a number of parameter combinations, making it useful in a variety of configurations.

Alicat’s patented, internally compensated laminar differential pressure measurement yields linear results over a very wide flow range. The resulting volumetric and mass flow data is fully compensated for changes in pressure and temperature and corrected for the user’s standard temperature and pressure (STP). Available 0.4% accuracy +0.2% full-scale repeatability and less than 100ms control response times ensure top performance of gas flow processes.

The MCD-Series’ large integrated display allows users to access setpoint control and PID valve tuning without need for a computer. It comes with 30 field selectable calibrations, and is available in full-scale mass flow rates from -0.5/+0.5 sccm to -3000/+3000 slpm. All units are backed by NIST-traceable calibration, comprehensive technical support, and a lifetime warranty.

To learn more about Alicat’s MCD-Series Bidirectional Mass Flow Control, visit, or call Gajendra Kelkar on +91 (0) 9930047455. To see an “Ask Alicat” video featuring the MCD, visit

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Doctor-Developed Iridotomy Lens from Volk for Laser Glaucoma Treatment

Blumenthal Iridotomy lens design next generation for iridectomy

Volk Optical has launched a new specialty lens for iridotomy procedures. Developed in conjunction with Eytan Blumenthal MD, the Blumenthal Iridotomy Lens design increases access to the periphery for more efficient glaucoma treatment with less potential for damage to surrounding tissues.

Volk Optical has launched a new specialty lens for iridotomy procedures.

Volk Optical has launched a new specialty lens for iridotomy procedures.

The design of the contact lens indents the cornea to open the angle and flatten the peripheral iris, delivering better patient outcomes with less post-laser inflammation. The Blumenthal Iridotomy’s precise positioning and sharply focused laser spot minimizes iris tissue collateral damage and distances the cornea from the iris to reduce the risk of endothelial cell damage.

The Blumenthal Iridotomy lens improves over classic lenses, as it is the only lens with corneal indentation capability for enhanced viewing of the far periphery. Constructed using Volk’s patented aspheric optics, the lens delivers better image quality and improved laser burn. Lower energy is required, reducing thermal collateral damage. The large lens housing improves lens grip and alignment for oblique viewing of the entire chamber.

Eytan Blumenthal, MD is Chairman of the Department of Ophthalmology at Rambam Health Care Campus (Hafia, Isreal). This is his second lens collaboration with Volk.

For more information about the Blumenthal Iridotomy lens from Volk, visit, phone Volk India at +91 22 67080400, or contact your Authorized Volk Distributor.

For more information please contact:
Mahadev Dhuri
General Manager – India (Volk-Keeler)
B-1, Boomerang, Chandivali,
Andheri (East), Mumbai – 400 072.
Board : +91 22 6708 0400
Mobile: +91 99303 11090
E-mail :

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SunTech Medical Oscar 2 Selected by PRA for a Pharmaceutical Research Trial

ABPM monitor provides 24-hour tracking of patient’s blood pressure throughout study

The SunTech Medical Oscar 2 Ambulatory Blood Pressure Monitoring (ABPM) system has been selected by PRA (Raleigh, N.C., USA) for use in a Phase I clinical study. The study will investigate the inhibition of degenerative mechanisms to provide improved neuroprotection for those with Alzheimer’s disease.

SunTech Medical Oscar 2 Selected by PRA for a Pharmaceutical Research Trial

SunTech Medical Oscar 2 Selected by PRA for a Pharmaceutical Research Trial

SunTech Medical and PRA have signed a seven-month lease agreement for 23 Oscar 2 ABPM systems to be used in the study, taking place at the PRA research facility in Lenexa, KS. One of the many applications for ABPM is 24-hour monitoring and management of cardiac activity during drug therapy in pharmaceutical research trials. ABPM allows researchers to obtain a comprehensive picture of the effects of the medication on a patient’s daily blood pressure levels.

The Oscar 2 ABPM system provides reliable measurement and recording of 24-hour blood pressure data. It was the first ambulatory blood pressure monitor to achieve independent validation by both the BHS and ESH protocols for testing the accuracy of ambulatory blood pressure monitors. The patented Orbit™ blood pressure cuff uses a form-fitting sleeve to prevent slippage while patients carry out daily tasks, leading to more reliable data. AccuWin Pro™ v3 software provides practical, automated and flexible analysis, interpretation and reporting of 24-hour blood pressure data.

About PRA

One of the world’s largest CROs, PRA is transforming clinical trials through its people, innovation and operational transparency. PRA’s 10,000+ employees operate in more than 80 countries, delivering a broad spectrum of full-service and embedded clinical trial solutions that meet the demands of a diverse marketplace.

PRA’s Early Development Services group is committed to the highest standards of clinical excellence and scientific expertise. They operate state-of-the-art facilities in The Netherlands and North America as well as an innovative patient pharmacology model in Central and Eastern Europe providing the pharmaceutical and biotech industries with the unique scientific environment required for complex compound development and testing. In addition, PRA’s harmonized laboratory facilities in The Netherlands and the US are situated close to the clinical facilities and are configured to fully support all clinical study requirements.

Over the last 30+ years, PRA has established a reputation for specialized expertise and success in a variety of compounds, ranging from niche treatments and therapies to blockbuster drugs. PRA’s forward-thinking approach to clinical research innovation, customized recruitment strategies and technological advances continues to make a difference to healthcare patients around the world.

To learn more about PRA, please visit, email

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Ocean Optics Handheld Spectrometer Finalist for Prism Award

Compact IDRaman mini delivers fast, accurate Raman analyses in the field and laboratory

Ocean Optics’ IDRaman mini handheld Raman spectrometer has been selected as a finalist for the Prism Awards for Photonics Innovation. The Prism Awards honour the best new photonics products on the market and draw entries from around the world. The prestigious awards, which are co-sponsored by the trade organisation SPIE and the technology media company Photonics Media, will be awarded at the 2014 Photonics West trade show in February.

Ocean Optics IDRaman mini handheld Raman spectrometer

Ocean Optics IDRaman mini handheld Raman spectrometer

The IDRaman mini is a finalist in the Defense and Security category of the Prism Awards and is distinguished as a small-footprint, high accuracy instrument ideal for applications ranging from first responders identifying explosives to quality control specialists involved in sample authentication.

The IDRaman uses a novel sampling technique called Raster Orbital Scanning (ROS) where a tightly focused laser beam is moved or rastered across the sample in an orbital pattern. This allows an area about 10 times larger than the laser focus spot to be sampled, encountering more Raman active compounds. Because more Raman-active compounds are sampled, the resulting data incorporates a much higher sensitivity without sacrificing resolution. The increased accuracy in the Raman data further provides high confidence when identifying compounds through library matching.

Furthermore, the IDRaman mini is very small, just 9.1 x 7.1 x 3.8 cm (3.6 x 2.80 x 1.5 in.) and weighing about 11 oz. Its small size and operation from two AA batteries makes IDRaman very attractive for applications where a light, portable instrument is desired.

“The powerful performance of the IDRaman mini has captured the attention of both our customers and spectroscopy experts alike,” said Richard Pollard, President of Ocean Optics. “Combining the ROS technology into a truly handheld product makes accurate Raman measurements available for a variety of applications where fast, accurate material identification is important.”

The Prism Awards nomination follows industry recognition earlier in the year when the IDRaman mini claimed the Annual Readers’ Choice Award from Laboratory Equipment magazine.

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