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March 14th, 2012
A new range of water-approved submersible level transmitters is now available from instrumentation specialist Impress Sensors & Systems Ltd.
The new IWSL range of WRAS-approved submersible level transmitters is suitable for continuous submersion in water, for a wide range of level measurement applications in reservoirs and drinking water storage tanks, but also for use in rivers, boreholes, aquifers, environmental monitoring and V-notch weir flow measurements.
 IMSL WRAS Approved submersible level transmitter Manufactured in the UK by Impress Sensors, the IWSL sensors use a piezoresistive media-isolated, silicon sensing technology and a stainless steel diaphragm, which provide excellent stability, repeatability and resolution. The sensor housing is 316L stainless steel, making it ideal for reliable, repeatable hydrostatic level measurement. The sensors are available in nominal pressure ranges from 1mWG to 100mWG.
When installing a product that will carry, receive or be submersed in water from the public mains water supply in the UK, it is a criminal offence if that device does not comply with the Water Supply Regulations or Scottish Byelaws. The Water Regulations Advisory Scheme (WRAS) requires that these devices should not cause waste, misuse, undue consumption or contamination of the water supply and must be of an appropriate quality and standard. WRAS approval is the best way to demonstrate compliance as it is granted directly by representatives of the water suppliers and is therefore accepted by every water supplier in the UK.
All IWSL sensors are WRAS-approved with a single WRAS approval number and are temperature-compensated, calibrated and supplied with a traceable serial number and calibration certificate. Operating (media) temperatures are from -20 deg C to +60 deg C in non-freezing media. Cable material is PUR, with elastomeric (EPDM) O-ring seals that are carefully selected for compliance with WRAS.
Sam Drury, Sales & Marketing Director at Impress Sensors & Systems comments: “The electronics on the IWSL incorporate a microprocessor-based amplifier, which means no adjusting pots are required, which in turn means the electronics are very stable. The IWSL can also be custom engineered for specific applications, including various output options, accuracy levels and pressure ranges. The sensor is also suitable for battery operation when output options of millivolt or SDI-12 are selected.”
Impress Sensors will be exhibiting at IWEX 2012 (International Water & Effluent Exhibition) at the NEC from 22-24 May 2012 (stand E48), and at the WWEM (Water, Wastewater & Environmental Monitoring) exhibition, from 7-8 November 2012 at the Telford International Centre (stand 58).
For more information on the IWSL range of water-approved submersible level transmitters, please visit www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Tags: Hydrostatic level transmitter, level measurement, Level Sensor, Level Transmitter, Submersible level transmitter
Posted in General Information and News, Hydrostatic level transmitter, Level Transmitter, Submersible level transmitter | No Comments »
March 3rd, 2012
A new range of submersible dual output level and temperature transmitters is now available from instrumentation specialist Impress Sensors & Systems Ltd.
Manufactured in the UK by Impress Sensors, the new transmitters are suitable for continuous submersion in liquids such as water, oils and fuels. The sensors are available in ceramic (IMCTL) or silicon (IMSTL). All sensors provide dual independent, 2-wire, 4-20mA outputs: one for level and one for temperature, with no signal loss over long cable lengths. The sensors offer nominal pressure ranges from 10mWG to 100mWG (ceramic) and 0.5mWG to 100mWG (silicon).
 Dual output Submersible level transmitter with integrated temperature sensor The temperature sensor is based on a platinum resistance thermometer with Class ‘B’ accuracy (other accuracy classes are also available). The sensor housing is either 316L stainless steel, high grade Duplex stainless steel or a Marine bronze option for the IMCTL, making the transmitters ideal for hydrostatic level measurement, where temperature is also a critical factor in measurements.
All sensors are temperature-compensated and calibrated and supplied with a traceable serial number and calibration certificate. Operating (media) temperatures are from -20 deg C to +60 deg C in non-freezing media. Cable material is PUR, with PVC, FEP or TPE as options.
The IMSTL is the higher accuracy version and uses the latest piezoresistive media-isolated silicon sensing technology and a stainless steel diaphragm. This provides excellent stability, repeatability and resolution, particularly for high accuracy level and temperature measurement (including V-notch weir flow measurements) in rivers, canals, reservoirs, boreholes and aquifers.
The IMCTL is also designed for submersion in liquids such as water, oil and fuels. This device uses a ceramic sensor for level measurements, which provides excellent corrosion resistance, particularly where the media may be aggressive. Applications include level and temperature measurements in storage tanks, rivers, boreholes and aquifers, as well as environmental monitoring in estuaries and seawater applications (when used with the marine bronze housing).
Sam Drury, Sales & Marketing Director at Impress Sensors & Systems comments: “Because we manufacture the IMSTL and IMCTL sensors in-house, we can offer different versions of the sensors tailored for specific customer applications. For example, we can provide different level and temperature ranges, sensors for drinking water applications or WRAS-approved versions with special cable materials.”
For more information on the IMSTL and IMCTL sensors, please visit the website at www.impress-sensors.co.uk or call the sales team on 0118 981 7980.
Tags: Hydrostatic level transmitter, level measurement, Submersible level transmitter, Submersible temperature transmitter, Temperature Sensor
Posted in General Information and News, Hydrostatic level transmitter, Level Transmitter, Submersible level transmitter, Submersible temperature sensor, Temperature Sensors | 1 Comment »
February 21st, 2012
Impress Sensors also offer a full range of pressure transmitters, screw-in transmitters, submersible probes and level control switches, all with SIL2 (Safety Integrity Level 2) approval for hazardous environments.
The product range is is targeted at safety and hazardous area applications, including process manufacturers, chemicals, oil and gas, nuclear and Atomic Weapons establishments. The devices are also suitable for medical device applications.
The process industry demands the highest degree of safety and reliability these days. The current Safety Integrity Level (SIL) international safety standard provides suppliers and users with a common framework on which to design products and systems for safety related applications. The standard also provides a more scientific, numerical approach to specifying and designing safety systems, enabling the nature of the risk to be quantified.
SIL means risk reduction to a tolerable level. The required safety level of a process plant is classified in accordance with the international IEC 61 511 standard and depends on the risk constituted by a plant. The IEC 61 508 standard describes the requirements of electrical, electronic and programmable electronic devices used in such plants. Both standards subdivide plants and devices into 4 safety levels, from SIL1 for low risks, to SIL4 for very high risks. The allocation to these safety levels is based on the use of a risk graph and depends on:
• Extent of possible damage
• Frequency of persons present in hazardous areas
• Possibility of damage prevention
• Probability of an unwanted event occurring
The standards also describe the type of risk assessment and procedures for integrating certain safety functions into sensors and plants. Generally, the significant hazards for equipment and any associated control system have to be identified by the specifiers or developers via a hazard analysis. The analysis identifies whether functional safety is necessary to ensure adequate protection against each significant hazard.
Examples within safety related systems for mechanical engineering include auxiliary disconnected systems; fire detector and gas warning systems; monitoring of turbines; safety interlock and auxiliary disconnected systems for machines; devices for medical applications; and remote monitoring based on network, handling and programming of procedural constructions.
For more information on Impress Sensors’ range of SIL2-certified pressure, temperature and level control switches, contact the sales department at Impress Sensors & Systems Ltd on 0118 981 7980 or visit the website at http://www.impress-sensors.co.uk/sil-products.htm
Tags: Level Sensor, Pressure Sensors, Pressure Transmitter, SIL rated sensors
Posted in Flush Pressure Transmitter, General Information and News, Hydrostatic level transmitter, Level Transmitter, Pressure Transmitters, Process Pressure Transmitter, Submersible level transmitter, Technical Notes | No Comments »
June 21st, 2009
Submersible level transmitters are typically used for hydrostatic level measurement where the only access point is from the top of a tank, river, borehole or vessel. The sensors can be lowered into the media to the lowest point of where the measurement is required. The head of liquid above the sensor generates a pressure which we can measure and convert to a readable level measurement.
 Impress SDI-12L Hydrostatic submersible level transmtter Impress Sensors & System Ltd have been manufacturing submersibles level sensors for many years and have recently included the increasingly popular SDI-12 serial interface to accompany the standard analogue 4-20mA and voltage signals. With 1200 baud rate this serial interface is idea for battery powered applications such as those incorporating data logging and acquisition systems particularly in environmental monitoring. Multiple sensors, typically up to 10 devices, can be attached to a single data logger and simply addressed using the SDI-12 protocol, this therefore helps in cutting the costs of interfacing, wiring and channels per data logger.
Advantages of using SDI-12 submersible level transmitters:
- Low power consumption
- Measurement in understandable engineering units
- Level AND temperature output as standard
- Multiple sensors connected to a single bus
- Sensor output is internally compensated and calibrated
- High levels of accuracy, <+/-0.1% / FS TOTAL error band!
- User adjustable parameters
- Very good cost vs. performance ratio
By integrating the microprocessor based SDI-12 Interface into the submersible level transmitter we can calibrate and characterise the raw millivolt sensor output into user selectable engineering units and eliminate static and thermal errors by a series of algorithms. The microprocessor takes several pressure readings from the sensing element, averages them and then outputs the specified engineering unit using the SDI-12 protocol to communicate with the data logger.
The other interesting features of this technology means we can also utilise the internal temperature sensor used for the compensation of the pressure sensor and also output this temperature reading in Celsius or Fahrenheit to the data logger. This means level and temperature is available from a single submersible transmitter eliminating the need for a separate device!
The ‘SDI-12L’ transmitter is offered with two types of technology integrated for the sensor, a ceramic piezo-resistive sensor and a media isolated stainless steel piezo-resistive sensor. The ceramic is particularly suited to applications where compatibility may be an issue when used with aggressive media asuch as seawater, brakish and saline solutions, chemicals where stainless steel will be destroyed. For these applications we also have the option of using marine bronze, plastics and delrin to ensure complete compatibility.
The stainless steel sensor produces slightly better resolution and can achive pressure ranges as low as 0.5mWG up to 200mWG whereas the ceramic sensor has a minimum range of 5mWG and up to 200mWG. Both sensors achieve the 0.1% total accuracy by means of the microprocessor cmpensation and calibration.
Some typical applications that use the SDI-12 output are:
- River and reservoir level
- Tank level and vessel level
- Seawater and estuary level
- Borehole and Aquifer level
- Tsunami monoring systems
- Tidal and wave height monitoring
- Environmental monitoring
The increasing availability of data loggers and interfaces that utilies the SDI-12 protocol means that applications are becoming more widespread. For this reason Impress will consider the integration of this technology into other products upon request. Please get in touch if you have such a requirement to discuss in more detail.
Datasheet: SDI-12L Submersible level transmitter
Products Page: Submersible hydrostatic level measurement
For more information on the SDI-12L submersible level transmitter please contact us at sales@impress-sensors.co.uk The hydrostatic submersible level transmitters can be found here.
Tags: hydrostatic level sensor, Hydrostatic level transmitter, level measurement, Level Transmitter, SDI-12 sensor, Submersible level transmitter
Posted in Hydrostatic level transmitter, Level Transmitter, Submersible level transmitter | 7 Comments »
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