52 Sensor Focus Fast-Response Dissolved Oxygen Sensors
The DO6400 and DO6441 Process Dissolved Oxygen Sensors from Sensorex (USA) are submersible galvanic sensors available with either a built-in 4-20mA output signal capability for direct connection to a PLC or they can be connected to a standard 4-20mA transmitter and local display.
The DO6400 and DO6441 Process Dissolved Oxygen Sensors are ideal for long term continuous deployment in wastewater and aquaculture applications. Their galvanic sensor construction and electronics combine performance, ease of use and low maintenance to offer a reliable low life-cycle cost instrument for use in submerged water applications.
Dissolved oxygen (DO) sensors monitor the amount of dissolved (free) oxygen present in water and wastewater. Wastewater treatment processes frequently utilise aerobic bacteria to break down organic compounds in sewage. If the amount of DO in wastewater becomes too low, the bacteria will die; wastewater treatment processes then stop operating efficiently and undesirable septic conditions occur.
Accurate DO measurement is also critical for aquaculture operations in order to ensure that the organisms being cultivated have access to the levels of oxygen necessary to maintain life. When DO levels are low, fish feeding is reduced and growth is suppressed. Very low levels of dissolved oxygen can lead to extreme stress on fish and even death.
Reader Reply Card No.
New Monitor for Carbon Dioxide and Methane Gases
Edinburgh Sensors (UK) will be launching a new range of wall-mounted, single point gas monitors at the Sensor+Test 2012 exhibition. The new monitor range utilises dual wavelength non-dispersive infrared detection technology to provide high accuracy continuous sampling detection and measurement of either CO2 or CH4 gases at near-analyser quality.
Designed for use in a wide range of industries from general process control to biogas and landfill gas monitoring to controlled atmospheres in the horticulture industry, the new monitor offers reliable, high performance operation with low maintenance requirements.
New features include pressure and temperature-compensated volume readout and enhanced communication for control and data logging, including optional LAN support. Comprehensive output, alarm and fault indications are provided via the new on-board microcontroller, together with built-in data logging.
A new display screen provides more user information and high accuracy data readout. This new display also greatly simplifies system set up and signal output configuration. Enhanced security capabilities include password protection to prevent unauthorised adjustments being made to the monitor.
Reader Reply Card No. 217 New Low Power NDIR CO2 Sensor
SenseAir (Sweden) presents a new miniature low power NDIR CO2 sensor module, SenseAir S8 4B. The sensor can be integrated in a wide range of different
alarm applications where you want to detect CO2, such as leakage detection.
SenseAir S8 4B main application area is to serve as a
CO2 safety switch when built into equipment such as kerosene heaters and other equipment generating
potentially hazardous levels of CO2 gas. Because of low current consumption the sensor is suitable for battery applications and has an average current consumption of 2 mA.
SenseAir S8 4B measures 400 to 32000 ppm and alarm when the CO2 level is higher than 8000 ppm and stay in alarm mode until CO2 levels are below 6500 ppm.
The sensor is designed for high volume production with full traceability by sensor serial number on all manufacturing processes and key components. All sensors are individually calibrated.
Reader Reply Card No. 218 Liquid Analysis with Contact Free Sensors
The Memosens (Germany) standard for digital contact-free sensors sparked off a revolution in liquid analysis. Inductive coupling ensures perfect galvanic isolation of sensor and transducer. Measuring errors through ambient conditions such as moisture and corrosion or electromagnetic interferences now are a thing of the past. Since the disclosure of the Memosens protocol, partnerships with a large number of sensor manufacturers who can serve various applications have been formed. Memosens is certified for use in explosive atmospheres, and all components are mutually compatible.
Reader Reply Card No.
Ground-Breaking New FM-801 Formaldehyde Meter
A new portable, continuous measurement formaldehyde (HCHO) meter is now available from GrayWolf (USA). A reusable sensor cartridge employs the chemical reaction between formaldehyde and ß-diketone on a porous glass. The yellowing that results from this reaction is measured via photoelectric photometry with accurate readings to <20ppb HCHO, without significant cross- sensitivity, making it ideal for Indoor Air Quality (IAQ) applications. The unit ‘re-zeros’ between 30-minute tests allowing for continuous monitoring (unique for this technology), and provides an output for real-time connection to GrayWolf’s AdvancedSense meters, WolfPack area monitors and to WolfSense enabled mobile PCs.
Some key facts about this highly innovative meter: The FM-801 may be used for continuous monitoring and/or for 30-minute spot checks, The sensor cartridges are re-useable; up to 1000 tests per cartridge (at low formaldehyde levels), The base unit may be used as an independent, simple data-logger, with data downloaded to GrayWolf’s WolfSense PC software and The FM-801 can also be interfaced to a GrayWolf AdvancedSense meter, WolfPack monitor or WolfSense enabled WIN7 Tablet/Notebook. FM-801 readings are simultaneous to readings from any other sensors connected to the AdvancedSense, WolfPack, or Laptop and are logged into the same data file. Attach audio/photo/video/drawing/text notes to data files for efficient, reliable documentation of surveys. Measurement range is from <20ppb to 1ppm.
The FM-801 formaldehyde meter kit is supplied with a mini-tripod, 5 sensor cartridges, a set of alkaline batteries, AC adapter, WolfSense PC data transfer/reporting software (on CD-ROM or USB key), a USB download cable and a hard-shell carrying case..
Reader Reply Card No. 221 IET March / April 2012
www.envirotech-online.com Reader Reply Card No. 220 219 216
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