Beat – Process Instrumentation & Sensors December 20, 2007
Decmber 20, 2007
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Tutorial: Conductivity sensors
There are three liquid characteristics that are often thought of together, although they are different and use different sensor technology. Conductivity, ORP, and pH all have to do with specific chemical characteristics, but measuring each in a process stream requires its own approach. Conductivity is simply the ability of a liquid to conduct electricity, which is related directly to the concentration of ions in the liquid. While pH is concerned specifically with hydrogen ions, conductivity does not differentiate.
Industry news: User group presses for device language unity
NAMUR (Normenarbeitsgemeinschaft für Mess- Und Regeltechnik in der Chemischen Industrie, loosely translated, the standards working group for chemical industry measuring and control techniques) is pushing along the work of a committee trying to hammer out a common platform to bring together the two major device descriptor language platforms: EDDL and FDT. The organization feels that neither is wholly adequate on its own, but putting the two together has potential to create a best-of-both-worlds solution.
Wireless: New equipment health monitoring platform
Honeywell Process Solutions (HPS) has raised the ante for wireless instrumentation platforms by introducing its OneWireless Equipment Health Monitoring (EHM) system. HPS is offering this in conjunction with SKF, using a combination of hardware and software from both companies. This system is aimed at applications where equipment is not super-critical, since those installations usually already have monitoring. EHM installations will typically be those that are the next level down, where traditional monitoring systems have been considered too expensive to be cost effective.
Temperature sensors: Have it your way—RTDs, thermocouples built to order
If you’re an OEM or a volume user of temperature sensors and you can’t always find what you need from suppliers’ standard offerings, Thermalogic says it can make RTD, thermistor, thermocouple, and semiconductor sensor assemblies to order, to satisfy your unique applications.
Temperature transmitter: Fieldbus networking simplifies wiring
The TFZ programmable Foundation Fieldbus temperature transmitter from Moore Industries takes the analog signal from a temperature sensor and digitizes it to send the variable to the larger DCS via the H1 segment. The company says the transmitter can interface with 14 RTD types, and nine thermocouple types, as well as direct millivolt and resistance/potentiometer inputs.
Ozone sensor: Monitor water in critical processes
With the growing use of water sanitizing processes using ozone treatment, Mettler Toledo Thornton has released a new dissolved ozone sensor family for monitoring water for pharmaceutical and semiconductor applications. The new sensors interface with the Thornton M300 transmitter platform that includes conductivity/resistivity, dissolved oxygen, flowrate, pH, ORP and temperature measurements.
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