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,
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.
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.
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.
February 28th, 2011
Pressure sensors are devices that determine the pressure of the given medium. While not many people know, pressure sensor devices are widely used in daily operations. These sensors are helpful in monitoring fluid pressures in hydraulics, engines and pipes. To determine the pressure of solids and gases, special types of sensors are also available.
The size of sensor devices is usually about one cubic inch. However, some special types of sensors can also be more than hundred times smaller. One best example is the one used in microelectromechanical systems. The latest pressure sensors work on simple principle called as piezoresistance.
The changes in pressure cause the substance to conduct electricity at a specific rate. This leads to flow of charge related to a certain pressure level. This charge is generally fed to a wire that leads to the display and control panel for human analysis.
Pressure sensing technology
The conventional pressure sensors used resistors, strain gauges, metal alloys or polycrystalline semiconductors as a resistive medium. These materials can only conduct electricity based on their structure’s deformation. As the rise in pressure does not create any type of linear magnitude in deformation, special calibration technique must be used for finding out the real pressure.
A number of different pressure sensors are available for different applications and uses. An absolute pressure sensor measures the overall pressure of the system, keeping vacuum as a point of reference. A gauge sensor is another type of pressure sensor that measures pressure while taking ambient atmospheric pressure as reference. Different types of pressure sensors are also available for measuring two different contacts.
February 27th, 2011
Pressure sensors are as simple as their name suggests. They are devices that are used to measure pressure in minute or major quantities. With the help of pressure sensors you can accurately measure the pressure of a liquid or anything that involves force.
Appearance and functioning of pressure sensors
Pressure sensors have various applications and some can be as simple as a spring scale. When pressure is applied, it will cause the arrow to swing. These scales are not as sensitive as modern day pressure sensors. The latest pressure sensors can give an accurate output, which can be measured by electronic gadgets.
A brief guide on piezoresistive pressure sensors
Piezoresistive materials have great features due to which they are widely used in pressure sensors. Piezoresistive materials possess a property that allows them to regulate their resistance according to the flow of current. They display such properties if they are compressed or strained.
The functioning of piezoresistive pressure sensors
A piezoresistive pressure sensor contains numerous layers of silicon that is embedded between their protective surfaces. Their surface is usually connected to a Wheatstone bridge. A Wheatstone bridge is capable of detecting small differences in the resistance levels of an object. The Wheatstone transmits small amount of current that flows through the pressure sensor. A change in resistance can alter the levels of current passing through the pressure sensor.
A Wheatstone bridge is used to detect this change and can give you an accurate reading about the change in pressure.
February 25th, 2011
Most people are clueless about the different technologies utilised in manufacturing plants. They also have little knowledge about the calibration of equipment which is an integral part of the industry. Pressure sensors are usually used for the exact measurement of pressure.
Such high-accuracy pressure sensors provide the accurate measurement and calibration of pressure instruments. Some of the common devices include pressure transducers and pressure transmitters. Pressure sensors and calibrators are usually employed for metrology and laboratory use.
Pressure calibration instruments are used for various different functions. For instance, they are used for increasing the volume of industrial production. On the other hand, they might also be used for other industrial applications as well. Some of the pressure equipment used is as follows:
Pneumatic calibration hand pumps
These devices are generally used for producing exact air pressure set-points. They are also used for regulating the pressure devices or instruments along with a pressure indicator.
Digital test gages and high pressure calibration hand pumps
Digital test gages are used for attaching it to the top of the hydraulic calibration hand pumps. It is therefore used to calculate the exact pressure. High pressure calibration hand pump device is utilised to produce the calibration pressure along with fittings. Therefore, you can easily attach it to a pressure indicator.
Secondary pressure standards
This equipment is widely used in calibration technologies and other instruction workshops. Secondary pressure standards can also project accurate pressure readings.
Calibration standard pressure sensors
This equipment is used for accurate measurement. These devices are used in calibration laboratories. Some of the common calibration pressure sensors include differential pressure, transducers and transmitters.
Therefore, consumers should select a pressure sensor device on the basis of their requirements. However, they should not compromise on the quality.
February 24th, 2011
Pressure sensors are pressure sensing devices. This device can measure the pressure of gases as well as liquids. Pressure in general terms means the applied force to prevent the expansion of a fluid. It is described in force per unit area.
Pressure sensor – Uses and applications
A pressure sensor performs as a transducer and transmits a signal as a function of the pressure applied. It is also used as a monitoring device in a number of manufacturing plants. Due to its pressure sensing capabilities, it is also used in marine research plants along with production control.
Pressure sensors, in these industrial plants, facilitate positive results. Moreover, these devices can also be used to ensure permissible levels of safety. As mentioned, pressure sensors are used in different manufacturing plants. They are primarily used to keep a track of the overall pressure applied. In this way, workers in an industrial plant can ensure that the applied pressure stays within the prescribed limits.
Constant monitoring, thanks to pressure sensors, ensures that the desired end results are obtained. It also ensures that the machine does not malfunction due to the application of more pressure than required.
Gauge liquid pressure
A pressure sensor can also be used to measure liquid pressure in industrial environments. It is used in vehicles or automobiles for monitoring the oil pressure. Thus, a proper balance of oil pressure is maintained which allows the smooth operation of vehicles.
Pressure sensors indeed form an integral part of many different industrial and manufacturing processes.
February 24th, 2011
You may have heard the name of the device called the pressure sensor. These devices are used to measure the absolute pressure in manufacturing plants. Pressure sensors provide the users with exact details when it comes to measuring the pressure levels of different devices. An excessive application of pressure can result into untoward incidents and this is the reason why pressure sensors are used to avert any major tragedy.
The following are some of the different applications of pressure sensors:
Cranes and earthmovers
Pressure sensors are used in cranes or earthmovers. To be precise, they are used in equipment which is operated with hydraulic systems. For instance, they control movement such as gripping or applying force. Pressure sensors therefore track and offer pressure feedback to this equipment. These devices are used to track the hydraulic fluid level. This plays an important role in the overall maintenance of different equipment.
The user is thus notified whenever the pressure level in the equipment exceeds a specific safe level.
Measure pressure in gas applications
Pressure sensors are also used to monitor or measure the overall pressure in gas based applications. The compression of gas usually causes an increase in temperature. Pressure sensors in this case track the exact pressure of the air before it is transferred in the gas equipment.
Similarly, pressure sensors are also used in liquid based applications for monitoring the volume and liquid density.
Thus, the useful nature of pressure sensors is evident from the above mentioned applications.
February 21st, 2011
Pressure sensors have a variety of applications and can be used to measure the pressure in industrial procedures. They are used for aeronautics, weather studies and in automobiles etc. All kinds of industrial machines and equipment involved with pressure based tasks have pressure sensors in their applications.
What are the applications?
Pressure sensors are used in hydraulics, pneumatic systems, measuring submarine depths, water depths, liquid and gas pressures, etc. Pressure sensors can measure extremely minute pressures and hence have found very wide application in all kinds of industrial processes.
What are some of the specific uses of pressure sensors?
Pressure sensors that are made for high altitudes work with the Venturi effect for pressure measurement. The difference in pressure between two segments of a Venturi tube is measured by differently calibrated apertures. This difference is calculated to arrive at pressure levels. The speed of gas flow through the tube is directly in proportion to the differential pressure. A low range pressure sensor would be required if the difference in pressure is only small.
The common types of pressure sensor
There are almost unlimited varieties of pressure sensors according to their specifications, purposes, applications and uses. The commonly used pressure sensors which measure all ranges of pressures are expensive but highly accurate and efficient. Pressure sensors are manufactured specifically for measurements of pressures in very high temperatures and with field adjustments etc. Ceramic pressure sensor capsules, depth transmission pressure sensors, gauge pressure sensors, absolute and differential pressure sensors are some of the most common types.
Pressure sensors play a very important role in ensuring industrial safety and production standards by sounding timely alarms when the pressure in any industrial process is deemed to be inappropriate.
February 19th, 2011
Pressure sensors are industrial devices used to gauge the pressure of different gases and liquids. There are different types of pressure sensors according to the technology used and the purpose. Some of these are explained below.
Absolute pressure sensors
Absolute pressure sensors are devices that record pressure in relation to perfect vacuum pressure.
Vacuum pressure sensors
Vacuum pressure sensors are devices that are popular in taking pressure measurement that is lower than a given area’s atmospheric pressure.
Gauge pressure sensors
Gauge pressure sensors are popular for use in a number of applications as they are capable of being standardised to the atmospheric pressure of various regions.
Sealed pressure sensors
Sealed pressure sensors are devices that are used to take pressure measurements according to the sea level pressure.
Differential pressure sensors
Differential pressure sensors are effective if there has been an increase or decrease in two or more pressure systems. It is also effective to get a pressurised flow in vessels.
The workings of pressure sensors
Pressure sensors are capable of generating signals through the pressure imposed on electrical, auditory, optical and visual signals. Pressure sensors are used for a number of applications in daily living as well as many industrial applications. These devices are also known as indicators, senders and transmitters. Apart from measuring pressure, they are also used to measure gas flow, water level, liquid flow, altitude and speed.
Most pressure sensors employ different types of technology for the manufacturing process. The type of technology used for manufacture depends on the type of application it will be used for. The costs of pressure sensors are also determined by the technology used in production.