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.

DMD 831 – New high pressure stainless steel differential pressure transmitters 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

XMD Smart differential pressure transmitter with display! is a post from: Impress Sensors

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

XACT i Process Pressure Transmitter with ATEX & HART Communication! is a post from: Impress Sensors