PREI Instrumentation

Tel: +27 11 867 5001
Fax: +27 11 867 7631
Email: [email protected]
www: www.prei.co.za
more information about PREI Instrumentation

Joint venture yields new line of water samplers
February 2001, News

GLI International announced a new line of water and wastewater samplers through a joint venture with the well-known Manning Environmental of Georgetown, Texas. Founded in 1972, Manning Environmental makes ...
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Two-colour temperature monitoring
February 2001, Temperature Measurement

During the 1960s, a significant advance in infrared temperature measuring came about with the introduction of ratio or two-colour infrared thermometry. This technology uses two infrared sensors within ...
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Guaranteed DO sensor
January 2001, Sensors & Transducers

GLI Model 5600 series dissolved oxygen sensor carries a one-year guarantee on its replaceable membrane cartridge. If the cartridge fails for any reason, except for physical damage, it will be replaced ...
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Long-life pH sensors
January 2001, Analytical Instrumentation & Environmental Monitoring

Many industrial processes literally eat pH electrodes, with replacement being required every few weeks. The patented GLI differential sensors have significantly improved. This sensor performs in the ...
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Water quality monitor
December 2000, Maintenance, Test & Measurement, Calibration

One of the best ways to quantify the quality of water is to use a continuous turbidity monitoring system. The GLI Accu-4 is the latest generation of turbidity monitoring equipment. By using a four-beam ...
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AC current transducer
December 2000, Sensors & Transducers

Transducers which look like CTs can provide a 2-wire, 4-20 mA d.c. signal for monitoring AC currents from 10 to 2500 A. No auxiliary power is required, and the device operates from a loop power supply ...
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Hart communications
September 2000, Data Acquisition & Telemetry

Using the Hart protocol, numerous items can be monitored on a single communication line including process variables, temperature, relay status, configuration changes and other functions
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Water quality monitoring
September 2000, Analytical Instrumentation & Environmental Monitoring

Traditionally it has been acceptable to filter raw water to a reasonably good clarity (0,5 to 1,5 NTU) and then disinfect the water with chlorine, UV radiation or ozone to kill all the bugs. In the past ...
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DO sensor has significant guarantee period
September 2000, Sensors & Transducers

GLI Model 5600-series dissolved oxygen sensor carries a one-year guarantee on its replaceable membrane cartridge. If the cartridge fails for any reason, except for physical damage, it will be replaced ...
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Temperature compensated antimony pH electrodes
July 2000, Analytical Instrumentation & Environmental Monitoring

In pH measuring applications such as hydrofluoric acid, where glass electrodes have a short life, antimony electrodes are usually used. There are many makes of antimony electrode sensors available but ...
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High pH measurement electrodes with consistant characteristics
July 2000, Analytical Instrumentation & Environmental Monitoring

There is no glass formulation currently available that has zero sodium ion error (alkaline error). Since there will be some error, it is important that the error be constant and reproducible. With many ...
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Nonmagnetic impeler flow sensors and multi-input flow analysers
June 2000, Flow Measurement & Control

Two models of the GLI flow monitor/totaliser, available from PREI Instrumentation, can simultaneously accept inputs from up to four flow sensors, and provide the flow rate and totalised flow for each ...
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