bullet On-line Magazine 'Sensors & Transducers' (S&T e-Digest)

    (ISSN 1726- 5479)


No. 12, December 2002 



Table of Contents




New Way of Measuring Water Content in a Variety of Organic Solvents


Moisture Measuring MicroSpec is the stand alone miniature unit, capable of measuring water in organic solvents from 0 to 100 PPM up to 0 to 20% and higher. The combination of an ATR and Transmission measurements provides a system that can virtually work without a sampling system keeping cost of ownership to a minimum. The MicroSpec sensor is shown in Figure 1. The mounting block and controller are shown in Figure 2. (click a picture to see a ladge photo).

Applied Analytics, Inc.

Phone: (866) 584-6366

E-mail: sales@a-a-inc.com


MicroSpec moisture sensor

MicroSpec mounting block and controller

Fig. 1 Fig. 2




Novel Intrinsically Safe LVDT's Position Sensors


Ixthus Instrumentation announces the availability of a range of LVDT sensors requiring reliable position measurement in hazardous locations with its PTI 750 series of loop-powered intrinsically safe LVDT position transmitters. Economically priced and available from stock these products are Factory Mutual certified for use in Class 1, Division1, Group A, B, C, and D, and type 4 locations. Offering a 4-20 mA output, these units are ideal for valve positioning monitoring and other applications within power/gas plants, manufacturing facilities and other process industries. Significant features include:

  • Highly reliable "contactless" operation ideal for position feedback on critical equipment such as primary control valves and natural gas throttle valves.

  •  Electronics are hermetically sealed against corrosive environments and adverse operating conditions such as vibration, shock and changing pressure levels

  • The two-wire loop powered configuration can be run through troughs or non explosion proof conduit back to "safe" areas where compatible barriers are located.

This innovative range can measure from 25.4mm to 254 mm with a non-linearity of ± 0.5% for all models. Operating from 10V DC to 30V DC input, with an operating temperature range of-20 to 93 degrees C.

Malcolm Read

Phone: +44 1256 771166

23A High Street, Overton,

Basingstoke. RG25 3HB. UK.


LVDT's Position Sensors



Accelerometers Offer a Cost-Effective Solution for High Accuracy Measurements


Endevco's new Model 7596A and 7596AM3 VALULINE accelerometers offer a cost-effective solution for high accuracy, low level acceleration measurements requiring DC response. Featuring gas damping and internal overrange stops, the VALULINE is able to withstand high shocks (up to 10,000 g's) and acceleration loads. The VALULINE's patented design provides excellent stability, with a warm-up time of 10 ms and overrange recovery of <10 µs. The VALULINE is ideal for laboratory measurements, ground transportation studies and measurements, and modal studies on large structures. The Model 7596A features an integral cable, while the Model 7596AM3 incorporates a 6-pin connector, allowing for cable replacement. The 7596AM3 also provides an optional temperature sensor output for external thermal compensation.


Operating from 8.5 Vdc to 30 Vdc, VALULINE provides a high level, low impedance output that can drive most laboratory instruments, tape recorders and data acquisition systems without amplification or signal conditioning. Endevco Model 136 Three-Channel System, Model 4430A or OASIS Computer-Controlled System are recommended signal conditioners.



30700 Rancho Viejo Road

San Juan Capistrano,California 92675

Tel: (949) 493-8181

Fax: (949) 661-7231


7596A accelerometer



The CMOS Line Sensors PDI-LNL2048S and PDI-LNL2048R


This line sensor series has 2.048 x 1 effective pixels with a pixel size of 7um x 7um (version PDI-LNL2048S) and 200um x 7um (version PDI-LNL2048R). The maximum output rate is 40MHz. The PDI-LNL2048S/R series is impressive because of their wide dynamic range of 94dB (PDI-LNL2048S) and 96dB (PDI-LNL2048R). Outstanding features are high sensitivity, low dark current and excellent linearity. These sensors also include an electronic shutter as well as an anti-blooming drain. Even under low illumination conditions the resolution of these sensors is at least 12 bits.


FRAMOS, Electronic Vertriebs GmbH,

Dauthendeystrasse 2,

D-81377 Munchen

Tel.: + 49.89.710 667-0

Fax: + 49.89.710 667-66

E-mail: info@framos.de

CMOS Line Sensor PDI-LNL2048X



New Multichannel Signal Conditioners with TEDS Sensor Option


The Series 481 Multichannel Signal Conditioners from the Electronics Division of PCB Piezotronics, Inc., prepare measurement signals from piezoelectric sensors for input to recording or analysis instrumentation.  Versions are now available which permit operation with and read and write capabilities for TEDS (Transducer Electronic Data Sheet) IEEE P 1451.4 compliant charge mode and ICP® sensors. TEDS are mixed mode (analog/digital), self-identifying transducers that contain fields that fully describe the type, operation, and attributes of the transducer, and are typically used in large channel count modal and structural testing applications. A building-block architecture and wealth of options permits users to custom tailor their units with features such as gain, filtering, integration, and computer control. Three pre-configured models offer a combination of popular features. All models install into standard 19 inch (482 mm) instrumentation racks. In addition to TEDS functionality, other Series 481 options include RS-232 computer interface and RS-485 serial interface to enable daisy-chaining of multiple units, and incremental gain which allows for auto-normalizing each channel to English or metric units.


Andrea Mohn,

PCB Piezotronics, Inc.

Tel: + (800) 828-8840,

Fax: + (716) 684-0987

E-mail: amohn@pcb.com


Multichannel Signal Conditioners



Analog Devices Extends its Microconverter Family to Include Large Memory and Higher Speed Core

Integrating 12- or 16-bit ADCs & DACs with an 8052 MCU Core and 62 kbytes of Flash/EE Memory.


Analog Devices, Inc, today announced five new MicroConverters(R) and their associated QuickStart(TM) evaluation kits, adding to its extensive family of data-acquisition systems on a chip. These new devices preserve the signature analog-to-digital converter precision, enhancing the MicroConverter family by offering an eight-fold increase in on-chip memory--facilitating larger programs and C-programming. Each device offers 62 kbytes of flash/EE program memory, 8 kbytes of flash/EE data memory, and 2304 bytes of data RAM. A comprehensive suite of peripherals includes precision ADCs, voltage output DACs, PWM/sigma-delta outputs, temperature sensor, and reference. Also included are a watchdog timer, time-interval-counter, serial I/O ports (I2C, SPI & UART), and three timers/counters--timer 3 facilitates an accurate baud-rate generator at up to 524 kbaud.


The ADuC831/41 -- drop in replacements for the ADuC812 -- are for use in applications where larger memory and/or higher core speed are required. They differ in that the ADuC831 has a 12-clock-per-instruction core and a 16 MHz max clock rate, while the ADuC841 has a 1-clock-per-instruction core and a max clock rate of 16 MHz at 3 V and 25 MHz at 5 V. The high-frequency clock is supplied externally. The ADuC832/42 are identical to the ADuC831/41 respectively, except that they operate from a 32 kHz crystal, with an on-chip PLL generating the high-frequency clock. The ADuC831/32 have an 8-channel 200 kSPS ADC and a 100 ppm degrees C reference. The ADuC841/42 offer a higher throughput 8-channel ADC (up to 400 kSPS), a more accurate reference (20 ppm degrees C), an enhanced I2C interface, and higher core speed.


The ADuC836 is an expanded memory version of the ADuC816. It includes dual 16-bit sigma-delta ADCs, a 12-bit DAC, temperature sensor, reference and the same digital peripheral set as detailed above. For 24-bit performance, the ADuC824/34 provides a fully compatible upgrade path. All parts are packaged in a 52-lead plastic quad flatpack and in the smaller (8 mm x 8 mm) chip-scale package.


Integration, precision and low power make these parts ideal for smart/remote sensor interface in industrial, instrumentation (including portable) & automotive applications, as well as for monitoring/control of critical parameters in communications infrastructure such as base stations and optical transceivers.


Colette Cote 

Analog Devices, Inc.

804 Woburn Street 

Wilmington, MA 01887 

Tel: 781/937-1972; 

Fax: 781/937-1026 

Email: Colette.cote@analog.com



Endevco Working with National Instruments to Lead Development

of Open Standards with “Plug and Play” Sensors Program


SAN JUAN CAPISTRANO, Calif. - December 9, 2002 - Endevco today announced a collaborative initiative with National Instruments to promote widespread adoption of IEEE P1451.4. The Plug & Play Sensors Program aims to create an open sensors standard, giving systems integrators and end users the ability to automatically configure measurement and automation systems for sensors. Systems integrators and end users will be able to simplify sensor setup, use, and maintenance; automatically obtain calibration data; and eliminate manual data entry and error.


IEEE P1451.4 proposes that sensors include an embedded, low-cost memory chip containing standardized transducer electronic data sheets (TEDS). TEDS store important sensor information and parameters for self-identification and self-description, eliminating the need to manually input this data when configuring a system. NI has made a TEDS library for LabVIEW™ available free and downloadable from its web site at ni.com.


Through participation in the IEEE 1451.4 working group, Endevco is working with NI to establish a standard TEDS format that industry suppliers can use to develop sensors, instruments and software. Endevco will be providing technical papers and seminars to support its work with NI. These learning strategies will encourage measurement professionals to experiment with this new technology and see how minimal the trade-offs of this new technology can be.


As part of the program, the companies are also exploring how to expand plug and play capability to legacy sensors. Through a proposed online database of sensor vendors' model data on ni.com/sensors, users will be able to download TEDS binary files, or Virtual TEDS, to their systems, instantly enabling legacy sensors with plug and play capabilities. Virtual TEDS provides a smooth transition to the next generation of measurement and automation systems by allowing engineers to leverage new sensor technology with their existing measurement hardware. As the manufacturer of the smallest TEDS single axis and triaxial accelerometers, Endevco will provide engineers with practical advice on their use.







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