DS Series Combined pressure transmitter, pressure switch and pressure display

The DS range of pressure transmitter, switch and display combination is a three-in-one multi-function pressure sensor with signal conditioning which gives a current or voltage output signal, 1, 2 or 4 x independent PNP transistor switch outputs and a freely scalable and programmable led rotatable display!  The potential for this device is a complete control system in a single device, cutting installation and equipment costs and configuration to your exact control requirements.

With pressure ranges spanning from 10mbar on the DS 210 through to 600 bar on the DS 200 within the DS series we should be able to cover all requirements on air pressure measurement and liquid pressure sensing alike.  The DS range will cover your requirements for an air pressure transmitter, oil pressure transmitter, hydraulic pressure transmitter and also if it’s just a simple pressure switch that you require then this device will solve that requirement also.

There are several options available within the range including:

1. ATEX certification
2. 1, 2 or 4 switch points
3. analogue output in either 4-20mA, voltage or none!
4. electrical connection
5. process connection type

There’s also the option for a 3-wire 4-20mA configuration which allows for re-calibration of the 4-20mA output signal, not only is the display scalable, the output is also!

The digital LED display on the device is freely rotatable through 2-axis so you will always be able to see the display clearly.  If installed on a vertical pipe horizontally then simply rotate the display through the body until it is face on and then rotate it on the display part so the readings are horizontal.  The brightness is also adjustable depending on the environment you are installing to.

The DS 210 – Air pressure sensor switch

Suitable for air pressure and non aggressive gases, the start of measurement is from as low as 10mbar through to 1000mbar Gauge reference only.  Vacuum pressure ranges also available.

The DS 201 – Ceramic pressure sensor switch and display

Suitable for Gases and Liquids from pressure ranges from 600mbar through to 600 bar Gauge or Absolute reference making this suitable for gauge pressure sensor, absolute pressure sensor requirements and absolute pressure switch applications also.

The DS 200 – Stainless steel pressure sensor switch and display

Suitable for Gases and Liquids compatible with the stainless steel media isolated diaphragm.  Pressure ranges from 100mbar through to 600 bar Gauge or Absolute reference, being based on a silicon pressure sensor with stainless steel diaphragm the over pressure capability is inherently higher and also the resolution is higher than the DS 201 with the ceramic pressure sensor.

The DS 230 – OEM Digital pressure switch with display

Suitable for Gases and Liquids compatible with the ceramic diaphragm and FKM internal O-ring seal.  Pressure ranges from 2 bar through to 400 bar Gauge reference only.  This is a lower cost version with less accuracy and no transmission of output, just purely a pressure switch and pressure display device targeted at OEM applications.

The DS series pressure transmitters, switches and display products are very diverse in their capabilities as a control device, please contact sales for a discussion on to how best implement the pressure product into your application.

Product Datasheet: DS 210, DS 201, DS 200, DS230

Product Page: Combined Pressure Transmitter, Pressure Switch and Display products page

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

DS Series combined pressure transmitter, pressure switch & display! is a post from: Impress Sensors

IMP-LR Low Range pressure transmitter

The IMP-LR pressure transmitter has been designed for applications where the IMP standard industrial pressure transmitter cannot cater for the pressure ranges.  The IMP is limited to 500mbar as it uses a ceramic based piezo-resistive pressure sensor but the NEW IMP-LR offers pressure ranges from as low as 25mbar through to 1000mbar gauge, absolute ranges also available on request.

Based on an Oil filled isolated diaphragm silicon pressure sensor the IMP-LR can offer accuracy of <0.25% as standard with the option of linearity correcting to <0.1% FS BFSL if required.  Being an isolated diaphragm silicon pressure sensor the transmitter can be used on both liquids and gases.  The sensor is installed in the stainless steel housing and sealed on an O ring which means by selecting the correct material these pressure transmitters be used on a wide variety of applications and medias.

The pressure transmitter is built in our factory in Aldermaston in a modular format so when required it is taken from stock pre-assembled.  We then calibrate the sensor using the automated calibration system via the ASIC based digital electronics.  This means there are no internal pots giving a very stable output with good long term stability.  The transmitter build is finished by simply selecting the correct electrical connector and issuing the calibration certificate which comes as standard with every sensor.  The choice of electrical connections include both small and large Hirschmann style plug & sockets, M12 and binder connectors, IP66 and IP68 cable glands and MIL-Spec connectors also.

Available outputs include the standard 4-20mA current and a variety of voltages both ratiometric and non-ratiometric all of which are temperature compensated as standard.  The IMP-LR is also suitable for all types of installation and complies to the latest standards in CE, EMC and RFI protection.

Product Datasheet: IMP-LR Low range pressure transmitter

Product Page:  Low range pressure transmitters

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

IMP-LR – Low pressure transmitter from 25mbar! is a post from: Impress Sensors

XMD Smart differential pressure transmitter

The SMART differential pressure transmitter, XMD has been designed and developed for applications in the process industry, it has various possible applications such as level measurement of closed, pressurized tanks, pump and filter control, closed pipe flow measurement in conjunction with orifice plate, venturi or a nozzle.  It’s especially suited to the flow application due to the ability to switch the output from a standard linear output to a square root extraction where flow rate can be output.

The XMD has a differential pressure range from 75mbar through to 2 bar and with a static over pressure capable of 130 bar line pressures.  The calibrated pressure range can also be turned down to 10:1 times so for example a 75mbar range can give a fullscale output at 7.5mbar and still maintain the 130 bar line pressure!

The outputs available are 4-20mA as standard with the option of having HART® communication.  If this option is selected then ATEX approval comes as standard.  There are two possibilities for ATEX approval:

The construction is rugged and designed for harsh environments, the electrical enclosure is aluminium die cast, powder coated and has teh option of integrating a smart display which makes programming of the following parameters easy: electronic damping of signal, offset adjustment up to 90% of FS and turndown of span 10:1 times.  The housing is a two chamber aluminium die cast case and is prepared for fitting of chemical seals to extend the application possibilities.  Applications for the XMD Smart differential pressure transmitter include:

The optional display of the XMD is LCD with a visible range of 32.5 x 22.5 mm, the main display is 5-digit 7 segment with a height of 8mm whilst the secondary line is 8-digit 14 segment with a high of 5mm used for textual indication.  There is also a 1mm high 52 segment bar graph which runs along the bottom for clear and easy interpretation of the output from the device.  The whole device is rated to IP67 even with the display option!

Product Datasheet: XMD Smart differential Pressure Transmitter

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XACT i Process Pressure Transmitter, ATEX & HART

technology combined with a digital microprocessor for compensation and calibration.  Together the result is a highly stable and accurate to <±0.05% pressure transmitter suitable for processing, pharmaceutical, food and dairy applications.

Pressure ranges are from 350mbar through to 35 Bar in Gauge or Absolute reference with 5:1 turn down of range as standard and still maintains the stated accuracy levels.  This is useful for customers to stock certain ranges and calibrate them for different applications when required so as to reduce the number of devices held on the shelf!

The Innovative housing on the top of the device which incorporates the LCD display is integrated to the pressure sensor module via an I2C interface.  The build procedure of the XACT i ensures that the device is not only accurate but has highly stability and repeatable performance.  By ordering the integrated temperature cooling element we can use the pressure transmitter in applications where the process temperature is as high as 300°C!!

The display on the device is a clear 3 stage LCD of 32.5 x 22.5mm which indicates the pressure, current, temperature and also has a text line at the bottom for easy programming.  The device can be programmed, on-site via the display and push buttons on the front of the device (accessed when the laminated safety glass is removed).  The parameters that can be adjusted are:

1. Offset
2. Calibration range
3. Damping
4. Engineering units
5. Display function
6. Password

As standard the display can be configured to show the current pressure, temperature of the media, current output and engineering units being displayed.  Other interesting and useful features include the ability to see the maximum and minimum process pressures and temperatures which is particularly useful when a plant event has occured and no data logging is used.  The device can then hold and display the maximum/minimum pressure and temperature during this time and be used to check the process operation.

We also have the option of having ATEX certified to zone 0: II 1 G EEx ia IIC T4.   The device can be manufactured to incorporate HART® Communication and for additional cost software and a HART® configurator can be supplied also.

Product Datasheet: XACT i Process Pressure Transmitter

Product Page: Process Pressure Transmitter Page

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

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IMD Differential Pressure Transmitter

The IMD Differential pressure transmitter has been developed to cater for applications that may only be looking at a low level of differential pressure (from 350mbar) but with a HIGH static line pressure up to 200 bar!

The IMD has a differential pressure range from 350mbar through to 35 bar and can have a nominal static line pressure of up to 200 Bar which makes this product ideal for low differential pressure measurement across a filter on a pipe or manifold that may have excessively high line pressures.  This has always been an issue for applications and usually results in customers compromising on the resolution and accuracy by using a higher pressure range than what they actually need to achieve the high line pressure requirements!  Outputs include 2 and 3 wire 0/4-20mA and voltage outputs which are ideal for most conventional HMi’s, PLC’s, signal conditioners and data loggers.

The sensing technology used within the IMD is a strain gauge fabricated as part of the silicon chip.  This is then isolated from the media by means of an oil filled cavity and a stainless steel diaphragm which enables the product to be used with liquids or gases.  The housing and sensor is made from stainless steel and incorporates an internal Viton O ring seal making this product suitable for a wide range of applications.  Every device is temperature compensated and calibrated and supplied with a traceable serial number and calibration certificate. The integrated electronics can be configured to have either voltage and current outputs with zero and span adjustability via the internal Pots.

With optional ATEX approval to EEx ia IIC T6 extends the possible applications to Petrochem & Process Industry, other applications include the following:

• Hydraulics
• Pneumatics
• Filter condition monitoring
• Agricultural machinery
• Laboratory testing
• Mechanical engineering
• Environmental engineering
• Automotive testing
• Pumps & compressors
• Medical testing
• Waste water & sewage

Other applications for differential pressure measurement include tank level measurement in a sealed vessel where the air pressure in the top of the tank is measured relative to the hydrostatic pressure of the liquid in the vessel.  Flow measurement in a pipe by means of an orifice plate which creates a differential pressure dependant on the size of the orifice plate.  More can be seen about applications and typical installations following this link.

Product Datasheet: IMD Differential pressure transmitter

Product Page:  Differential pressure sensors

If you have any applications you wish to discuss or any questions questions regarding this product then please contact sales here sales@impress-sensors.co.uk

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IMP Industrial Pressure transmitter

The IMP Industrial pressure transmitter is now offered on a standard 4 day delivery which CAN be improved for urgent requirements!

The IMP is built on a Kan-Ban basis so part assembled bodies are held on the shelf ready for calibration via the ASIC based Microprocessor and all that is required then is the electrical connector to be fitted as specified by the customer.  This enables production to perform a quick pressure range of the device, calibration and installation of Electrical connection.  The options include Plug & Socket, IP66 Cable, IP67 Cable M12 Connector, Amphenol Connector and others on request.

The Pressure transmitter is based on a piezo‐resisitive ceramic pressure sensor giving it excellent media compatibility.  The housing is made from stainless steel with a choice of internal O ring seals to ensure the product is suitable for a wide range of applications.  Every device is temperature compensated and calibrated and supplied with a traceable serial number and calibration certificate.  The electronics incorporate a microprocessor based amplifier, this means there are no adjusting pots and therefore the electronics are very stable, specially in high vibration / shock applications.

We cover pressure ranges from 500mbar through to 700 bar with this product and have options for Absolute, Gauge and Sealed Gauge reference.  The electrical outputs available are  mV, Volts and 4-20mA Current output as standard.  If your application requires improved performance from the standard<± 0.25% then we can offer a <±0.1% within 7 days delivery on any pressure range.

IMP pressure transmitter up to 150°C

We have options of different housing material such as PVC, PVDF & PEEK to solve applications with aggressive chemicals.  The ceramic sensors are ideal for these applications as they are virtually inert.  We can also supply a version which has an integrated temperature cooling element.  This will enable the transmitters to be exposed to 150°C media temperatures!

Product Datasheet: IMP Industrial Pressure Transmitter

Product Page: Industrial pressure transmitter product page

Please contact Impress for any questions about the pressure sensors, transmitters and transducers we offer: sales@impress-sensors.co.uk

IMP Industrial pressure transmitter on 4 day delivery! is a post from: Impress Sensors

Some specific advantages can be gained from using pressure transducers that operate on the Linear Variable Differential Transformer (LVDT) principle. Here, a pressure responsive element is directly coupled to the core of a linear LVDT.

Pressure Sensors integrate LVDT Technology

An LVDT is an electro-mechanical device that produces an electrical output that is linearly proprtional to the displacement of a moveable core. It consists of a primary coil with two secondary coils placed on either side of the primary coil. A rod-shaped soft magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils.

When the primary coil is energised by an alternating current, source voltages are induced in the two secondary coils. The secondary coils are connected in series with the start of each winding being connected together. This arrangement produces a net zero signal output from the secondaries when the induced voltages are equal in each coil. This condition occurs when the core is centrally disposed between the two secondaries. A movement of the core leads to an increase in magnetic coupling to the coil in the direction of movement and a reduction in of magnetic coupling to the other coil producing a net output signal from the connected secondaries. Movement in the opposite direction produces an identical signal output but of opposite phase.

To form a pressure transducer, the core displacement of the LVDT is produced by the movement of a metallic pressure responsive diaphragm.

Some LVDT pressure transducers are fitted with a single, precision metallic diaphragm with over range pressure protection stops as the pressure-responsive element. This arranagement allows the manufacture of differential, gauge and absolute transducers, which all employ a common design philosophy.

The distinct advantage of using an LVDT transducer is that the moving core does not make contact with other electrical components of the assembly, as is the case with other types. This means an LVDT transducer offers high reliability and long life.

The LVDT design also lends itself very well to easy modification in order to fulfil a whole range of different applications in both research and process engineering.

Positive Over-pressure

An LVDT gauge-type pressure transducer lends itself very well to being protected from damage by positive over-pressure. The sensor’s safe limits are normally much greater than those specified by the manufacturer and unrivalled by alternative technologies. Often, the sensor will still operate above the specified over-pressure limit, but at a reduced accuracy. In contrast, silicon and thick-film pressure sensors do not exhibit this level of over-pressure capability.

Rupture Integrity

Unlike silicon and thick film pressure sensors, LVDT pressure transducers provide process containment for applied static pressures of up to 400bar or higher. Special welding techniques are used to improve rupture integrity, supported by an over-pressure stop. In addition, the diaphragm material can be relatively thick, offering enhanced durability and improved resistance to pin-holing (corrosion).

Shock Loading

LVDT pressure transducers can be impact shock-loaded in all three axes without sacrificing the performance of the sensor. The diaphragms are not made from brittle materials and so failures due to shock loads are rare.

Fluid Fill

Process compatibility is also a key requirement when sourcing a suitable pressure transducer. With LVDT pressure sensors, flush diaphragms can be provided rather than fluid-filled units. This offers enhanced process compatibility and does not limit the temperature range. In addition, if the pressure sensor is required to perform in a hygiernic application such as a dairy or food processing application, a low cost silicon-filled sensor will require a barrier of some sort to prevent conatmination. In contrast, the design of an LVDT pressure sensor makes it inherently suited to hygienic, FDA-compliant applications.

Process Interface Options

LVDT pressure sensors open up a wide range of process interface and wetted material options for the user. With sufficient understanding of the application, the sensor manufacturer is able to optimise the measurement solution at the lowest cost.

Transmitter Electronics

LVDT pressure and level transmitters enable the user to adjust both zero and span settings. Analogue and digital signal processing types are available. Most analogue transmitters will offer zero and span adjustment, square root option, time constant and ±100 per cent offset adjustment.

Digital electronic types offer local configuration of zero and span, along with the ability to turn on or off the instrument preset non-linear function. Digital types can normally be configured via an integral communication port.

Submersible type LVDT pressure sensors normally use digital signal processing and have the option of either a simple single wire configuration port that allows zero and span calibration together with the ability to turn on or off the instrument preset non-linear function, or full RS485 communication that enables full configuration of the transmitter.

LVDT Pressure Transducers for the Nuclear Industry

In the nuclear sector, LVDT pressure transducers are utilised in reactor research and development work; leak detection on nuclear transport flasks; detection of leakage from Magnox storage ponds; monitoring material storage pond levels; storage room pressure monitoring; level measurement in effluent treatment works; and glove box gas handling systems. LVDTs are even used in weapons de-commissioning, where the sensor must withstand highly aggressive chemicals such as Hydrobromic Acid and where radiation immunity is critical.

LVDT pressure transducers are generally favoured by the nuclear industry because they offer distinct advantages over alternative pressure sensor designs.

LVDT tranducers provide high immunity to radiation and can be stable to 10 exp6 rad, with some manufacturers offering versions that allow up to 10 exp12 rad without damage to the sensor.

LVDT sensors can also withstand higher temperatures, with high radiation continuous working options typically available up to 200 deg C.

LVDT sensors also benefit from the fact they can have remote electronics up to 1,000 metres or more of cable between the sensor and the signal conditioning electronics. This allows the sensor to operate in extreme radiation, temperature and high magnetic fields, conditions that would normally damage the conditioning electronics.

In LVDT sensors, the segregation of the transducer from the pressure-responsive element enables many specialist materials to be used for compatibility with the process fluid. Manufacturers can therefore produce sensors with Tantalum, Hastelloy, stainless steel, Monel, Inconel and PTFE sintered coatings.

Products Page: LVDT based pressure sensors & transmitters

For more information on these products please contact Impress sales on sales@impress-sensors.co.uk

Pressure sensor utilises LVDT technology! is a post from: Impress Sensors

Pressure sensors vary considerably in their design technology used, performance and application.  Pressure sensors often can be referred to as pressure transducers, pressure transmitters, pressure indicators or pressure switches – are used to measure the pressure of gases and liquids (fluids).

Pressure is an expression of the force and is normally stated in terms of force per unit area. A pressure sensor will generate an electrical signal relating to the pressure imposed. This signal is either analogue or digital in more modern designs, although optical, visual and auditory signals are also common.

Pressure sensors, basics of pressure measurement

Industrial pressure transducers normally have a diaphragm type design that uses strain gauges, which are either bonded to, or diffused into it, with the strain gauges acting as resistive elements. Under the pressure-induced strain, the resistive values change. In capacitive technology, the pressure diaphragm is a single plate of a capacitor that changes its value under pressure-induced displacement. These are probably the most common technologies used in industrial applications for their favourable price/performance ratio.

Pressure is measured against a reference, which greatly depends on the application and installation of the sensor. Depending on the relevant pressure, the term ‘absolute’ is used when the reference is vacuum; ‘gauge’ is used where the reference is atmospheric pressure; and ‘differential’ is used where the sensor has two ports for the measurement of two different pressures.

Pressure sensors are used in a wide variety of applications for control and monitoring purposes. Pressure sensors can also be used to indirectly measure other variables such as liquid or gas flow (in conjunction with an orifice plate), speed, fluid level and also altitude.

Due to the wide range of technologies available, pressure sensors vary considerably in their design, performance, application and cost. Every technology has its own benefits and reasons for selection within an application.

When used directly to measure pressure, applications include meteorology instrumentation, aerospace and defence, research and development, automotive and other machinery or equipment that has pressure functionality implemented. Other applications for pressure sensors include hydraulic and pneumatic systems, water depth, offshore & marine, waste water & sewage, oil & gas exploration, nuclear, medical, food and beverage processing, tank level/contents, HVAC systems, agricultural equipment, environmental monitoring and chemical & processing plants.

Pressure Products Page:  Impress Sensor pressure products page

Basics of pressure measurement is a post from: Impress Sensors

DSK 701C Capacitive Pressure Sensor

A new range of ready-to-mount pressure sensor modules for OEMs is now available that customers can integrate into their machine designs and instrumentation, including equipment that needs to be ATEX-certified for hazardous environments.

The DSK 701C pressure sensor module from Impress Sensors & Systems Ltd is a ready-to-assemble capacitive ceramic pressure sensor module that offers very low pressure ranges (20 bar down to 60mbar) but extremely high overpressure resistance.

An additional benefit to OEMs is that the module is ATEX-prepared for Zone 0: II 1G Ex ia IIC T4 certification. This means the OEM can simply install the sensor module straight into a housing or on a machine, knowing that the module itself will require no additional, separate ATEX certification.

Designed specifically as a cost effective module for OEMs and machine builders, the DSK 701C can also be configured and programmed by the customer via an integrated RS232 interface. An optional configuration kit is available, which enables the OEM to reconfigure sensors for different end user applications. The module is simply connected to a PC via the RS232 interface and menu-driven programming software is used to calibrate pressures, configure starting points and end points of the pressure range, damping and offset adjustment.

The pressure sensor module will have a wide appeal amongst OEMs and specialist machine builders, from waste water, sewerage and marine applications, through to manufacturers of inkjet printers. Some customers may already have their own electronics but require a ready-to-mount, low cost pressure sensor module to complete their system solution.

The DSK 701C has a ceramic membrane and offers a high turn down ratio of 10:1, without sacrificing accuracy. For example, a 1 bar rated sensor module can be turned down to 100mbar, but the accuracy remains at 0.1% and overpressure of 8bar is permissible.

The modules are available in gauge and absolute versions with a 4… 20mA output signal. Response time is 120ms (without electronic damping) and operating temperature range is from –40 deg C to +125 deg C. The unit is supplied with a PTFE filter as standard, with a brass venting tube option also available.

Product Datasheet: DSK 701C Capacitive pressure sensor

Product page: Sensing Element products page

For more information on the DSK 701C, please call the sales department on 0118 981 7980 or visit the website at www.impress-sensors.co.uk

ATEX-prepared Capacitive pressure sensor modules is a post from: Impress Sensors

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We hope to cover all of the products in the range with product releases and also new products also, just as a reminder of some of these categories and please see below, the links will take you to the relevant product section.

Pressure Sensors

Temperature Sensors

Level Sensors

Distance Sensors

Indicators

Controllers

Data Loggers

Data Recorders

Calibration Equipment

SIL2 Approved Products

ATEX approved Products

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