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February 4th, 2012
OEM pressure transmitter is ideal for refrigeration and cooling systems
A new stainless steel welded pressure transmitter for refrigeration, chillers and air conditioning systems is now available from instrumentation specialist Impress Sensors & Systems Ltd.
The new 17.609 G welded pressure transmitter has a stainless steel housing, pressure port and diaphragm and requires no O-ring seals. The transmitters can operate in temperatures from -40 deg C to + 125 deg C, making them ideal for OEM pump and compressor applications within refrigeration, chillers, air conditioning and other process cooling systems.
 - 17.609G OEM pressure transmitter,
Refrigeration
Sam Drury, Sales & Marketing Director at Impress Sensors & Systems comments: “Refrigeration plants use gas, liquid and mechanical energy to move heat from one place to another. Compressors and pumps are required to repressurise the gas, and discharge the liquid through cold water heat exchangers or cooling fans.”
“The refrigeration media, normally R134a in Europe, is mixed with an oil or lubricant, of which there are many different types. This is to ensure that the refrigerant can be transported easily through the pipework. However, when it comes to selecting a pressure transmitter for the pumps or compressors within these systems, it is very difficult to achieve compatibility between the refrigeration media [oil or lubricant] and the O-ring seals on the pressure transmitter. The 17.609 G is ideal for these types of applications, as it operates oil-free and is welded so it requires no O-rings.”
The pressure transmitter is available in compound nominal pressure ranges from 0… 6 bar up to 0… 60 bar and from –1… 6 bar up to –1… 60 bar. This means the sensors can measure pressures in a vacuum, as well as being resistant to vacuum conditions. The sensors also offer up to three times overpressure or higher.
The pressure transmitters are designed to withstand the vibration and shock levels normally associated with pump and compressor applications. The sensors are also supplied with a ¼-inch flare connection, the industry standard for refrigeration applications.
Standard output is 2-wire, 4…20mA, with optional 3-wire, 0…10V or 3-wire ratiometric also available.
For more information on the new 17.609 G pressure transmitter, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Pressure Sensors, Pressure Transmitters | No Comments »
February 3rd, 2012
New oil-free stainless steel pressure transmitter is ideal for oxygen and mobile hydraulics applications
Instrumentation specialist Impress Sensors & Systems Ltd has launched a new oil-free stainless steel welded pressure sensor for oxygen applications, where silicon oils or elastomeric seals cannot be used. The sensors offer high overpressures (typically three times the nominal pressure rating) and so are also suitable for mobile hydraulics and machine engineering, where pressure spikes or peaks are present.
The new DMP335 has no O-ring seals, which means the sensor is easier to keep clean and sanitise for medical applications. The sensors are completely de-greased before despatch to the customer.
 DMP335 Oil-free oygen all stainless steel pressure transmitter Sam Drury, Sales & Marketing Director at Impress Sensors & Systems comments: “Oxygen is present in many process manufacturing environments, medical applications, as well as filling and bottling plants. The oxygen needs to be transported safely through these processes without coming into contact with oil or other contaminated fluids, which could cause an explosion. The all-stainless steel, oil-free design of the DMP335 pressure sensor makes it ideal for these types of environments.”
The sensors are ATEX-certified (intrinsically-safe) for hazardous gas and dust environments (Zone 0 and Zone 20). Nominal pressures are available from 0… 6 bar up to 0… 600 bar. Permissible temperatures are from –40 deg C to +125 deg C. Output signal is either 2-wire: 4 to 20mA, or 3-wire: 0 to 10V.
A version of the sensor is also available with 4-digit LED display and 1, 2 or 4 PNP contacts. The digital display is configurable and can be rotated through 180 degrees.
For more information on the new DMP335 pressure sensor, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Pressure Transmitters | No Comments »
January 27th, 2012
Instrumentation specialist Impress Sensors & Systems Ltd has launched a new compact, multi-channel controller with large touchscreen colour TFT display and up to 72 digital inputs/outputs. The controller is therefore ideal for the simultaneous measurement and control of a wide variety of process engineering applications.
The new CMC-141 controller is the ‘big brother’ of the CMC-99, providing all the same functionality and features, but also offering a larger 5.7-inch (320 x 240 pixels) backlit display, more inputs/outputs (up to 72) and new types of logic channels. The CMC-141 now provides brand new channels, including a universal input card that can accommodate a range of sensor inputs. New counter inputs are provided too, as well as additional flow meter and rate meter inputs. Despite these extra features, the CMC-141 is still housed in a compact enclosure with the same panel insertion depth (100mm) as the CMC-99.
 New CMC-141 multi-channel controller has a larger display and more I/O options Sam Drury, Sales & Marketing Director at Impress Sensors & Systems comments: “Another added value feature of the CMC-141 is that it comes with JAVA applets, which can be embedded into any website or HTML-based web page, allowing users to remotely access real time data from the controller via the Ethernet interface and a web browser.”
The CMC-141 can simultaneously record all channel data at a maximum speed of 10Hz (ten samples per second). The unit provides up to 1.5GB of internal data memory, which is sufficient to continuously save data from all input channels at a speed of 1 sample per second for more than 2 months (125,000,000 samples in total). The operator can download saved data using a USB flash memory disk or remotely via Ethernet.
The CMC-141 provides three card slots on the reverse of the controller, each comprising 24 I/O pin options, which enable the user to choose any combination of inputs and outputs to suit the application. For example, up to 72 analogue current or voltage inputs could be used; up to 36 relay/SSR outputs; 36 thermocouple inputs; 18 RTD inputs; or a combination of these. The unit also incorporates a 24V DC digital input, enabling relays and triggers to be set up.
The CMC-141 is low cost compared to existing alternatives on the market and is ideal for a wide range of process applications, including centralised temperature measurement and control; multi-zone heating control; intermediate pumping station control; spraying and heating control for greenhouses; control of industrial furnaces and incinerators; and for engine test cell measurements.
Measuring just 144mm x 144mm x 100mm, the controller housing is very compact, which means the unit can be installed in restricted spaces. The controller has a 5.7-inch backlit colour TFT display and is based on the Linux operating system, with touch-screen menu navigation, offering ease of use and familiarity to the operator. A USB interface is provided on the front of the device, enabling the user to upload or download software programs quickly and easily via a USB memory stick.
PID Control
The controller is available in two power supply versions, 230V or 24V AC/DC. An auxiliary 24V DC/200mA supply output on the back of the unit enables external sensors and actuators to be connected and powered by the controller. The CMC-141 can also act as a PID process controller, providing a reliable control loop feedback mechanism for a variety of process temperature and pressure control applications.
The CMC-141 also comes with a number of communications interfaces, including two RS485 ports, one RS232, one Modbus RTU, a second USB Host and a 10MB Ethernet connection, allowing the controller to integrate easily with the customer’s existing process control networks and fieldbuses.
The CMC-141’s integral software provides the user with archiving, printing and visualisation options. A variety of visual presentation display options for recorded measurements are available, including numerical display, bar graph or needle gauge display.
For more information on the CMC-141 multi-controller, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Digital Indicator, Indicator, PID Controller, Pressure Displays, Process Indicator | No Comments »
January 16th, 2012
Impress expands mechanical pressure switches to include high pressure series
Instrumentation specialist Impress Sensors & Systems Ltd has expanded its SQ range of mechanical pressure switches to include a high pressure series, which is adjustable between 50 and 100 bar.
The new SQ high range mechanical gauge pressure switches are available in three versions: the cost effective SQ275-RH1 zinc-plated SPDT (single pole, double throw) pressure switch; the SQ276-RH1 stainless steel SPDT version for media compatibility; and the SQ27U-RH1 brass SPDT pressure switch. All three switches are user-adjustable between 50 and 100 bar.
The switches are a cost effective, robust option for OEMS and end users across a diverse range of process control applications, including pressure control for piping systems, lubrication systems, hydraulics and pneumatics, air compressors, hydraulic detection for fire fighting systems, sprinkler systems, medical equipment, and tyre manufacturing.
The SQ range of mechanical pressure switches from Impress Sensors also includes a medium pressure series. With similar technical features to the high pressure range, these switches are available in zinc-plated, brass and stainless steel housings, with adjustable pressure ranges between 20 and 49 bar.
The SQ high range pressure switches have NBR diaphragms as standard, with Viton and EPDM diaphragms available as options. Electrical connection is made by simple spade terminals and the switches have a G1/4” male process connection.
 SQ 76 series mechanical pressure switches The switches can operate in temperatures from -10 deg C to +100 deg C. Response frequency is 2Hz and accuracy is +/- 5% FS.
Sam Drury, Sales & Marketing Director at Impress Sensors & Systems Ltd comments: “By introducing the high range SQ switches into our existing range of mechanical pressure switches, we can now offer customers robust, user-adjustable pressure switches from 5mbar up to 100 bar. Different housing materials, diaphragms and selectable contacts, allows us to cater for every customer’s needs, from harsh, media compatible environments through to simple low cost mechanical switches for non-process critical applications.”
For more information on the SQ range of mechanical pressure switches, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Pressure Switch, Pressure Switches | No Comments »
January 15th, 2012
New differential pressure transmitter for gas and compressed air applications
A new range of compact, lightweight differential pressure transmitters for gas and compressed air applications is now available in the UK from Impress Sensors & Systems Ltd.
The DPS 200 range of differential pressure transmitters is designed to operate with any gas or compressed air and so is ideally suited to Buildings Management Systems, including HVAC (Heating, Ventilation and Air Conditioning) systems, low differential pressure measurement applications and industrial clean rooms.
The DPS 200 comprises a piezoresistive pressure sensor and an optional integrated LC display. The unit is available in 14 nominal pressure ranges (differential and gauge) from 1 mbar up to 1,000 mbar. The 5-digit, 7-segment LC display has a digit size of 8mm and a visible range of 32.5mm by 22.5mm.
 DPS 200 Low range differential pressure transmitter Sam Drury, Sales & Marketing Director at Impress Sensors & Systems Ltd comments: “The DPS 200 is very competitively priced compared to alternatives that are currently available on the market. The units can be fitted anywhere along a pipeline or within a control cabinet or panel. The unit is protected by a rugged ABS housing to IP54 and is both compact and lightweight.”
The DPS 200 operates at a high measuring rate of 1kHz, with a response time that is adjustable by using a potentiometer in the range 50ms up to 2.5s. 3-wire current or voltage outputs are available.
As Drury states: “Being able to adjust the response time is particularly useful if the user needs to eliminate any false triggering in the system. For example, if a filter somewhere in the system becomes blocked over time and the transmitter normally operates at a nominal differential pressure of 50mbar. This differential will increase progressively over time due to the filter blockage, which can cause chatter. By dampening the response time of the transmitter, false triggering within the system can be prevented.”
The DPS 200 is temperature-compensated in the range 0 deg C up to 50 deg C. The unit also provides all the required electrical protection, including short-circuit protection, reverse polarity and electromagnetic protection according to EN 61326.
For more information on the DPS 200 digital pressure transmitters, please call the sales department on 0118 981 7980 or visit the website at www.impress-sensors.co.uk
Posted in Differential Pressure Sensor, Differential Pressure Transmitter, Pressure Transmitter with Display | No Comments »
January 14th, 2012
Marine-Approved Level and Pressure Sensors now available from Impress
Instrumentation specialist Impress Sensors & Systems Ltd has launched two new marine-approved sensors for level and pressure measurement of storage and ballast tanks. Both sensors are approved by DNV and Germanischer Lloyd.
The new LMK 458 is a hydrostatic probe with ceramic (Al2O3) diaphragm that is suitable for level measurement in marine storage/ballast tanks and draught monitoring, as well as applications in the water industry such as desalinization plants and drinking water filtration.
The probe uses a capacitive ceramic sensor element that provides a high resistance to overpressures. The transmitter is protected to IP68 and provides good resistance to chemicals and high long-term stability.
 Marine Approved Pressure Transmitters An optional intrinsically safe (IS) version of the LMK 458 is also available. This version is ideal for measuring the pressure of various fluids in harsh marine environments, including Zone 0 ATEX areas. Other options include different housing materials, either stainless steel as standard or a Cupro-Nickel (CuNiFe) sea water-resistant version. Other options include screw-in or flange-mounted versions, as well as other accessories such as probe flanges and mounting clamps.
The LMK 458 has a diameter of just 39.5mm and is able to operate in temperatures from -25 deg C to +125 deg C. The sensor is accurate to 0.25% FSO (to IEC 60770). Nominal pressure ranges are from 0-40 cmH2O, up to 0-200 mH20.
In addition to the LMK 458, Impress Sensors has also launched a marine-approved pressure transmitter. The DMK 458 is a pressure transmitter with ceramic diaphragm that is suitable for monitoring pressures in a variety of marine and offshore applications, including loading and unloading systems, level measurement in ballast and storage tanks, draught monitoring, and anti-heeling systems used on ferries and cargo ships, which prevent heeling of the ship during loading and unloading.
The DMK 458 offers high overload pressures, excellent accuracy and high temperature resistance. The transmitter is available in nominal pressure ranges from 0-40mbar up to 0-20bar. As well as threaded versions, the transmitter is also available in various flush mounted versions, which are ideal for measuring pressures of viscous, pasty and polluted media.
The DMK 458 can operate in temperatures from -40 deg C up to +125 deg C. The sensor is accurate to 0.25% FSO to IEC 60770. An optional IS-version for Zone 0 applications is also available.
For more information on the LMK 458 or DMK 458 pressure transmitters, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Flush Pressure Transmitter, Level Transmitter, Pressure Sensors, Pressure Transmitters | No Comments »
January 13th, 2012
New high pressure stainless steel differential pressure transmitters offer three-in-one capability
Instrumentation specialist Impress Sensors & Systems Ltd has launched a new range of high pressure (up to 70 bar), mechanically robust differential pressure transmitters for liquids and gases. The transmitters provide three-in-one capability, including an adjustable 4-digit LED display, a pressure transmitter and two PNP pressure switch connections.
The new DMD 831 is a stainless steel differential pressure transmitter for industrial use that incorporates two piezoresistive stainless steel sensors and stainless steel diaphragms. The transmitter is therefore suitable for a wide range of plant and process engineering applications, including HVAC, energy and laboratory applications.
 DMD 831 - Differential pressure transmitter with display and contact for liquids and gases Differential pressure sensors and transmitters measure the difference in pressure from one side of a diaphragm to the other or between two diaphragms. When pressure is applied, the DMD 831 determines the pressure difference between positive and negative sides and transforms this into a proportional electrical signal. Typically, this enables the measurement of pressure drop across a filter due to build up or blockages, or for measuring flow and level via a pressurised vessel.
The DMD 831 is a cost effective, compact solution for OEMs and end users across a diverse range of process control applications, including pressure control for lubrication systems, hydraulics and pneumatics, air compressors, steam, water, fuels and oils.
Sam Drury, Sales & Marketing Director at Impress Sensors & Systems Ltd comments: “The robust, compact design of the DMD 831 allows it to be integrated in a diverse range of process engineering and machinery applications, particularly where the installation space is restricted. The sensors also provide a turn down capability of 10 to 1.”
Seven different versions of the DMD 831 are available, with differential pressures from 0… 80 mbar up to 0… 70 bar. The transmitters operate in media temperatures from -40 deg C to +125 deg C. Switching accuracy is +/- 0.5% FSO according to IEC 60770. The transmitters are ingress protected to IP65.
For more information on the DMD 831 range of differential pressure switches, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Differential Pressure Sensor, Differential Pressure Transmitter, Pressure Transmitter with Display, Programmable Pressure Transmitter | No Comments »
January 13th, 2012
New rugged transmitters offer pressures up to 6,000 bar
Instrumentation specialist Impress Sensors & Systems Ltd has launched a new range of stainless steel pressure transmitters that are suitable for a wide range of high pressure applications, including hydraulic circuits, water jet spraying and other high pressure chemicals, pharmaceuticals, oil, gas and petrochemicals applications.
The design of the new DMP304 ultra-high pressure transmitter is based on a compensated strain gauge, bonded onto a stainless steel diaphragm. With its rugged, stainless steel housing, the sensor offers a maximum nominal pressure of 6,000 bar, making it suitable for use in a variety of harsh, high-pressure industrial applications.
 DMP 304 Ultra High pressure transmitter Sam Drury, Sales & Marketing Director at Impress Sensors & Systems Ltd comments: “The DMP 304 is ideal for applications where the customer is looking for a robust, high precision, high reliability pressure transmitter that also offers very high nominal pressures. A version of the sensor is also available for intrinsically-safe, hazardous gas and dust applications.”
Special characteristics of the sensor include the ability for the user to adjust the offset and span (difference between FSO and zero) via front-sided potentiometers. This means engineers can take out sensor drift or any residual pressures in the system and can also scale the output to their preferred pressure range.
The DMP 304 is accurate to 0.5% FSO according to IEC 60770. An optional 0.25% FSO version is also available. For users wishing to calibrate the transmitter after installation, an MIL/Bendix connector plug option is supplied as standard, enabling shunt calibrations to be carried out, simulating up to 80% of FSO.
The DMP 304 is available in nominal pressure ranges from 0…2,500 bar up to 0…6,000 bar. Output signal is 2-wire, 4 to 20mA or a 3-wire 0 to 10V version is available on request. The response time of the sensor is less than 2.5 milliseconds.
For more information on the DMP 304 range of ultra-high pressure transmitters, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Posted in Pressure Sensors, Pressure Transducers, Pressure Transmitters | No Comments »
January 8th, 2012
Compact digital pressure gauges offer exceptional price/performance ratio
A range of low cost, battery-powered digital pressure gauges has been launched, which offers customers a direct, cost effective replacement for their existing, less accurate mechanical gauges.
The DM 10 range of battery-powered digital pressure gauges is available through Impress Sensors & Systems Ltd, a sensor and instrumentation specialist. The gauges are targeted at a wide range of applications, including hydraulics & pneumatics, process engineering, R&D/laboratory work, and mobile pressure monitoring, including mobile construction vehicles, tractors, pumps, compressors and filters. The gauges have a ceramic diaphragm and so are also suitable for environments in which aggressive chemicals are present.
 DM 10 Low cost digital pressure gauge Sam Drury, Sales & Marketing Director at Impress Sensors & Systems commented: “The DM 10 is a cost effective direct replacement for most mechanical pressure gauges. It has a 63mm diameter display, the same as common mechanical gauges, but the DM 10 offers higher accuracy, repeatability and reliability.”
The DM 10 is designed to be mounted easily and quickly in-situ. The 4.5 digit, 7-segment LC display can be rotated independently of the housing, providing the engineer with clear sight of the display at all times, regardless of the mounting configuration. The housing itself rotates 270 degrees about the horizontal axis.
The device is operated through a simple, menu-driven display via push buttons on a touchpad. As well as showing information about the nominal pressure range, the unit can display via the menu the maximum and minimum pressures of a process. “For example, an engineer may have a fault in the system and therefore needs to check what the maximum pressure reading on the gauge was. An increase in the system pressure from say 6 bar up to 10.5 bar may indicate an over-pressure problem within the process and this would be displayed on the gauge,” Drury added.
Users can also choose which units of measurement they prefer, including bar, mbar, psi, mH2O and MPa. Additional functions include auto-zero and an automatic switch-off, where the user can define between 1 and 5 minutes or select continuous operation.
Nominal pressure ranges for the DM 10 are from 1.6 bar up to 250 bar. Minimum operational life of the battery is 1,500 hours.
For more information on the DM 10 range of battery-powered digital pressure gauges, please call the sales department on 0118 981 7980 or visit the website at www.impress-sensors.co.uk
Posted in Pressure Displays, Pressure Gauge, Pressure Transmitter with Display | No Comments »
January 3rd, 2012
Controller offers simultaneous measurement and control of multiple channels
A new compact, multi-channel controller with touch-screen display is now available, which is ideal for the simultaneous measurement and control of a wide variety of process manufacturing applications.
The CMC-99 controller from Impress Sensors & Systems Ltd provides an incredible variety of input and output combinations to suit individual customer requirements. The three card slots on the reverse of the controller each comprise 16 I/O pin options, which enable the user to choose any combination of inputs and outputs to suit the application. For example, up to 48 analogue current or voltage inputs could be used; up to 16 relay/SSR outputs; 24 thermocouple inputs; or 12 RTD inputs; or a combination of these. The unit also incorporates a 24V DC digital input, enabling relays and triggers to be set up.
CMC-99 Multichannel PID Controller, Indicator & data logger The CMC-99 is low cost compared to existing alternatives on the market and is ideal for a wide range of process applications, including centralised temperature measurement and control; multi-zone heating control; intermediate pumping station control; spraying and heating control for greenhouses; control of industrial furnaces and incinerators; and for engine test cell measurements.
Measuring just 96mm x 96mm x 100mm, the controller housing is very compact, which means the unit can be installed in restricted spaces. The controller has a 3.5-inch backlit colour TFT display and is based on the Linux operating system, with touch-screen menu navigation, offering ease of use and familiarity to the operator. A USB interface is provided on the front of the device, enabling the user to upload or download software programs quickly and easily via a USB memory stick.
PID Control
The controller is available in two power supply versions, 230V or 24V AC/DC. An auxiliary 24V DC/200mA supply output on the back of the unit enables external sensors and actuators to be connected and powered by the controller. The CMC-99 can also act as a PID process controller, providing a reliable control loop feedback mechanism for a variety of process temperature and pressure control applications.
The CMC-99 also comes with a number of communications interfaces, including two RS485 ports, two RS232, a second USB Host and an Ethernet connection, allowing the controller to integrate easily with the customer’s existing process control networks and fieldbuses.
The CMC-99’s integral software provides the user with archiving, printing and visualisation options. A variety of visual presentation display options for recorded measurements are available, including numerical display, bar graph or needle gauge display.
The CMC-99 is also available with a transparent, lockable door to IP42. An IP65 version is supplied with an additional fitted moulded frame.
For more information on the CMC-99 multi-controller, please call the sales department on 0118 981 7980 or visit the website at www.impress-sensors.co.uk
Posted in Uncategorized | No Comments »
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