On-line Magazine 'Sensors & Transducers' (S&T e-Digest)
(ISSN 1726- 5479)
Vol. 52, No. 2, February 2005
Table of Contents
The Study of a Disposable Mercury Film Electrode for Determining the Blood Sugar
Abstract: This paper reported the details of the fabrication of a disposable mercury film electrode for the determination of blood sugar. It possessed excellent voltammetric characters and could be applied in the indirect anodic stripping voltammetric determination of blood sugar. The linear range is from 5.00 to 200ppb, the regression coefficient is 0.9950, and the average recovery rate is 92.7%.
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Tu Yi-Feng, Xu Jian
1College of Chemistry and Chemical Engineering,
The Institute of Analytical Chemistry,
Suzhou University, Suzhou,
Potentiometric Fingerprint Profiling of Eurycoma longifolia Extracts (Tongkat Ali)
Using Multichannel Artificial Lipid-Polymer Membrane Sensor
Abstract: This paper reports a novel application of biomimetic sensor system for phytomedicine analysis. The in-house fabricated multichannel artificial lipid-polymer membrane sensor consists of eight non-specific lipid-polymer membranes with partially overlapping selectivity and cross-sensitivity towards complex liquid extracts from Eurycoma longifolia. The generated multidimensional electrical potential response pattern due the interaction of the lipid sensing element with the chemical constituent present in the liquid samples were analyzed qualitatively by potentiometric fingerprint profile and further processing using chemometric pattern recognition algorithms namely hierarchical cluster analysis (HCA) and principal component analysis (PCA). The score plot of the PCA of the marker compounds and various sample treatment (mode of extraction and drying method) indicated the sensor responded linearly towards increasing concentration. Further quantification of the E. longifolia isolates and extracts using simple linear regression gives good calibration curve (R2 >0.90) except eurycomanone (R2 = 0.55). This study extends the areas of sensor application, thus demonstrating the capability of the developed sensor system as a promising tool for quality control and standardizing phytomedicinal products.
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Ismail ZHARI1, Ahmad MOHD NOOR2, Oon – Sim CHEW1, Shafiqual Islam A.K.M1
1School of Pharmaceutical Sciences, Universiti Sains Malaysia,
11800 Minden Penang, Malaysia
2Northen Malaysia University College of Engineering,
02600 Arau, Perlis, Malaysia
Tel: 604-6533888 ext 4222, Fax: 604-6563443,
Intrinically Safe Low-Cost Accelerometers
Gaithersburg, MD – Wilcoxon Research, the supplier of quality vibration sensors, has received Intrinsic Safety certification for two of its most popular low cost accelerometer series: the 786 and 787. These accelerometers are now rated to operate in hazardous areas in accordance with U.S., Canadian and European standards.
Obtaining the Intrinsic Safety (IS) certification means that Wilcoxon’s 786 IS Series and 787 IS Series units can be used where flammable or explosive materials are present without causing electrical sparks or “hot spots” strong enough to cause ignition of gases or dusts in the air.
The 786 IS Series of top exit accelerometers includes an integral cable model (the 786F) and the first dual output accelerometer with temperature sensor to receive IS certification (the 786T). The 787 IS Series are side exit units, and include an optional modified mounting stud.
Marketing Communications Specialist,
Maintenance Free Torque Sensors
February 1, 2005, Depew, NY, USA - Rotary transformer torque sensors from the Force/Torque Division of PCB Piezotronics, Inc. utilize non-contact, rotary transformers for sending excitation voltage to, and receiving measurement signals from, the rotating strain gage sensor. The maintenance-free, rotary transformer design eliminates the need for replacing worn brushes, as is necessary with conventional slip-ring type rotating torque sensors. The units are an ideal choice for use in torque studies on pumps, electric motors, engine dynamometers, transmissions, and gearboxes.
Series 4200 rotary transformer torque sensors offer capacities from 100 to 100,000 in-lb (11 to 11.3k N-m) full-scale and maximum speeds to 10,000 RPM. These shaft-end, temperature-compensated units feature 2 mV/V output sensitivity and an integral shunt calibration network, and are available with an optional foot-mounted housing.
Peter Munschauer, Division Manager
3425 Walden Avenue
Depew, NY 14043-2495 USA
Tel: (888) 684-0004 ext. 2405, fax: (716) 684-8877
Airflow Sensor Provides Digital Output and Wide
Degree Controls, Inc. (degreeC), a designer of airflow and thermal solutions is pleased to announce the AccuSense F900 Airflow Sensor. This new F900 sensor measures the velocity and temperature of airflows in applications such as biological safety cabinets, fume hoods, electronic enclosures, clean rooms and other critical containment areas. The F900 is the only OEM airflow sensor available offering a digital TTL output for direct control of your airflow environment.
With a normal sensing airflow range from 0.15-2 m/s (30-200 fpm) up to 0.15-10 m/s (30-2000 fpm), depending on the calibration, the F900 Series offers unparalleled price to performance, compact size, reliability and resistance to mechanical shock and vibration. Various temperature compensation settings are available, including +/- 5% of reading from 10-35oC and +/-10% of reading from 10-60oC.
With a supply voltage of 7-13 VDC, the F900 Series has a linear 0-4V output or a digital TTL output. Based on AccuSense’s proven thermistor technology, the F900 retains its calibration over time and can be easily installed as part of a control loop to precisely manage your airflow. The F900 is priced at $95 for 1,000 pieces in the standard format.
A variety of sensor head styles are also available, ranging from the standard X” long tube to the sensor head remotely mounted on a long cable for installation in tight locations.
18 Meadowbrook Drive
Milford, NH 03055
Humidity/Temperature Transmitter with Interchangeable Probes
E+E Elektronik has designed the humidity / temperature transmitter EE22 with interchangeable probes. The calibration data is stored in the probes, and the most significant feature of the EE22 Series is the interchangeable sensing probes with connector, which allows the performance of the EE22 to not be affected.
The accuracy over the entire temperature range is based on precise calibration methods. Well-proven E+E humidity sensor elements ensure excellent long-term stability. For cases where there are extreme temperature applications from –40°C up to +80°C (-40°F…+176°F) or limited space availability, the sensing probes can be connected to EE22 housing with cables (2, 5 or 10m / 6.6, 16.4 or 32.8ft) without any repercussions for the overall accuracy of the instrument. The temperature output can be scaled according to the application, for example 0 to 1 / 5 / 10 voltage or current 4 to 20 mA (2 wire) outputs.
Ing. Werner Hentscholek,
E+E Elektronik GmbH
A-4209 Engerwitzdorf, Austria
New Russian DRGB-90 Radiation Dosimeter Gives Audible
and Visible Measurement
The DRGB-90 radiation dosimeter gives audible and visible measurement of radiation levels (hard beta-rays and hard-gamma rays). It can be used to check the background radiation in a house or workplace and check for contaminated products or food. The measuring instrument neither emit radiation and no have any harmful effect on the user or environment. The dosimeter is based on a Geiger counter and was made by a Russian military manufacturer.
The device's analog indicator has two scales. The upper scale is in microsieverts per hour (μSv/h). This scale has three parts: green for radiation levels comparable to the natural background, yellow for high but allowable levels, and red for dangerous levels. The lower scale works by the same way but is graduated in microroentgens per hour (μR/h). The range switch has two settings: “x1” for measuring values indicated on the meter (0-3 microroentgens) and “x10” for measuring values 10 times higher (0-30 microroentgens). The “Search” switch turns on or off the sound signal The “light” button illuminates the meter. The “dump” button zeroes out the accumulated reading before taking another measurement and before switching ranges.
Measurement accumulation (integration) time is 60 s. The power supply consists of three AA batteries. One set of batteries will operate the radiation dosimeter continuously for at least 300 hours under natural background radiation conditions. The radiation dosimeter weighs is 0.25 kg. The dosimeter is intended for use at temperatures from 263 to 313 °K (-10 to 40 °C, 14 to 104 °F).
For more details:
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Radiation Control Devices and Dosimeters:
Digital Sensor System Interface to ME'scope
February 1, 2005, Provo, UT, USA - Larson Davis announces that Vibrant Technology Inc. now offers an acquisition window connecting the Larson Davis Digital Sensor System (DSS) directly to their popular ME'scopeVESTM software for modal analysis and operating deflection shape animation. This window provides a seamless integration between software and hardware, putting the DSS completely under control of the software.
With this development, ME'scope users can now benefit from the revolutionary Digital Sensor Interface Transmitter (DSIT) technology utilized by DSS to reduce the cost and complexity of cabling associated with high channel count modal test systems. Connect up to sixteen transducer channels to each low cost ribbon cable.
DSS works with both uniaxial and triaxial accelerometers, providing ICPВ® current and supporting Transducer Electronic Data Sheet (TEDS) equipped transducers. A single DSS chassis can be configured to support as many as 64 channels in a small, lightweight package at a surprisingly low cost.
Marketing Manager, Acoustic Test Products,
Larson Davis, Inc., 1681 West 820 North
Provo, UT 84601 USA,
(888) 258-3222, fax: (801) 375-0182
SGA Strain Gauge Amplifier
The SGA Strain Gauge Amplifier from Celsum Technologies is a flexible, reliable and cost-effective instrument for conditioning the signals from your strain gauge based transducers (including half-bridges), producing two stable analogue outputs (current and voltage) in user-selectable formats. It can be configured to accept most strain gauged transducers, reducing the need to stock several different amplifiers.
Models are available for operation from a mains power supply (SGA/A)† or from DC (SGA/D). The SGA has an adjustable low-pass filter, and allows simultaneous voltage and current outputs. A version is available for conditioning LVDT transducer signals, too.
Roy E Carter, Celsum Technologies Ltd
Willow House, 17 Braemar Close
Mountsorrel, Leicester LE12 7ES UK
Tel: +44-(0)116-210-6319, fax: +44-(0)870-120-9370
Peak Pressure Monitoring System Combines Amplifier and Peak Meter
February 1, 2005, Depew, NY - New Model 400B20 Peak Pressure Monitoring System from the Pressure Division of PCB Piezotronics, Inc., combines a dual mode amplifier module, a peak voltage monitoring module, and an AC power supply module into one integrated device. The unit connects directly with an ICPВ® or charge output piezoelectric sensor, normalizes sensor sensitivity, and displays peak transient measurement signals in voltage or pressure units. Ballistic testing applications include gun barrel chamber pressure testing and lot testing of ammunition. Alternate version is also available for force, vibration, shock, and impact applications.
The dual mode amplifier features continuous gain, and resetting or zeroing may be accomplished manually or remotely. Peak voltage monitoring module features dual set points that provide the ability to establish acceptable threshold levels. Alternative version for ballistic testing (Model 444A52) incorporates only the peak voltage monitoring module and AC power supply module. Model 444A52 provides ICPВ® signal conditioning, and may also be connected to an existing charge amplifier for use with charge output sensors.
Dan Cummiske, Division Manager
3425 Walden Avenue
Depew, NY 14043-2495 USA
Tel.: (888) 684-0011 ext. 2613, fax: (716) 686-9129
Montreal Based Semiconductor Technology Company
Montreal, Quebec, February 11, 2005 - Microbridge Technologies Corp., a privately held semiconductor technology company announced the closing of its Series B equity financing, raising a total of $5.5 million US in venture capital.
The financing round was led by Zon Capital Partners of Princeton, New Jersey and includes investments by the Business Development Bank of Canada (BDC) Venture Capital, and Schneider Electric Ventures (SEV) of France, along with the existing seed investors, the Solidarity Fund QFL and Innovatech Montrйal. This brings the total investment in Microbridge to date to $7.5 million US. The funds will be used for sales and marketing ramp up, product production ramp up and the next stage of technology development.
Michael S. Foster,
President and CEO,
Tel: (514) 938-8089 ext 225, fax: (514) 938-9089
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