8
Health & Safety Wide Area Sounder With 750m Effective Range
With an output at 1m in excess of 140dB, louder than a jet engine on full power at takeoff, the new A141 high output disaster siren and alarm from E2S (UK) is the most powerful device ever produced by the company – so far. With a power increase from 100W to 400W, the output of the A141 is substantially higher than the A140 it replaces, giving it an effective warning range of between 500 and 750m depending on the atmospheric conditions. The unit has a choice of 32 user-selectable warning tones and with second and third stage alarm capability, it is ideal for use in quarries, on large industrial and petrochemical sites and for civil defence requirements. The A141 generates multiple internationally recognised alarm tones including fire, security, civil defence, alert, COMAH (SEVESO II) toxic gas alarms and disaster warnings for flood, tsunami, tornado and other severe bad weather conditions.
The A141 is powered from either 24VDC or 115/230VAC. The mains-powered versions can be fitted with battery backup to enable it unit to operate for up to 30 minutes without mains power; AC power and battery voltage can be remotely monitored for potential faults. Radio control capability, utilising secure telemetry for additional security, is available to enable wire-free installation on large sites. Both AC and DC versions feature low start-up inrush current and low operating current draw, and, unlike traditional electro-mechanical warning devices, they are lightweight, require no maintenance and offer the reliability, low energy consumption and long life associated with solid state devices.
Reader Reply Card no 19 Improved Noise Dosimeter
Casella CEL (UK) has redeveloped its popular lightweight and cable-free dBadge noise dosimeter to increase its robustness, allowing the dosimeter to be used in the harshest of environments with absolute reliability.
Owing to its popularity for use in mining applications, the redeveloped dBadge now features rubber over- moulding on the case to further increase toughness, and provide protection from the water and dust prevalent in mines or similar environments.
Casella has also added a new model to its noise dosimetry range, the CEL-350L dBadge ‘Lite’, which offers simple functionality at a very affordable price. The ‘Lite’
measures all the same occupational noise parameters as the original dBadge except for the time history of exposure to noise levels, so is ideal for users needing straightforward noise dose results at low cost.
Market Manager Tim Turney commented: “The redesign of the dBadge shows Casella CEL’s commitment to continually improving its range of high quality exposure measurement instruments. The addition of the dBadge ‘Lite’ to the range ensures that cost need not be a deterrent to safety.”
Reader Reply Card no 20
Real-Time Analysis of Electromagnetic Fields in Hand-Held Format
Narda Safety Test Solutions (Germany) has now equipped its frequency-selective measuring set for electromagnetic fields with a “Scope” operating mode. Using this, it is now possible to analyse the frequency content and time characteristics of signals from radar equipment, mobile communications services such as Wi-Fi, WLAN, WiMAX, and DECT, or radio control systems like ZigBee and Bluetooth.
The Selective Radiation Meter SRM-3006 from Narda Safety Test Solutions is now available with a “Scope” operating mode. The instrument displays the real-time characteristic of a signal recorded using frequency selection. It is possible to measure pulse widths and signal periods as well as set triggers, just as with an oscilloscope. The time intervals that can be set range from 24 hours down to microseconds, and the resolution goes down into the nanosecond range. It can therefore be used to make long-term observations of individual radio channels e.g. over the course of an entire day, as well as to detect even the shortest of impulses, such as from radar equipment.
This combination of frequency-selective measurement and display versus time opens up possibilities that are not covered by either pure spectrum analysis or simple measurement over time:
In unknown multi-frequency environments specialists can determine the type of field source by marking a frequency line displayed in “Spectrum” mode and switching to “Scope” mode to look at the time characteristic which exhibits specific features for various mobile communications services such as Wi-Fi, WLAN, WiMAX or DECT. The resolution bandwidth (RBW) can be set between 40 kHz and 32 MHz – enough to capture an entire WiMAX channel. Where the signals are known, e.g. from GSM stations, operators can select a single 200 kHz bandwidth traffic channel (TCH) and measure the loading of the individual timeslots within the frequency channel using “Scope” mode.
In “Scope” mode, the instrument records the real peak values of radio control signals in the industrial environment, such as ZigBee, or Bluetooth, or in the public and private domain – garage door openers, automobile keys, installation switches – even in complex situations where several signals are superimposed. The SRM-3006 measures the average, RMS and peak values simultaneously; further conclusions about the type of field source can be drawn from the ratios of these values to one another. The instrument can be set to display all results in either physical quantities, such as field strength (V/m, A/m) or power density (W/m2
, mW/cm2 ), as logarithmic expressions
(dBµV), or directly as a percentage of the permitted limit value. For the latter, the weighting curves for all the current safety standards are stored in the instrument. The SRM-3006 automatically takes the calibration data into account
when Narda’s proprietary antennas are used. The instrument also accepts measuring antennas from other manufacturers, such as socalled sniffer probes. In such cases, software can be used to upload the calibration data to the instrument.
About the SRM-3006
The Selective Radiation Meter SRM-3006 from Narda Safety Test Solutions has been specially developed for environmental and safety measurements in electromagnetic fields. Using isotropic measuring antennas, the instrument covers the entire frequency range from 9 kHz to 6 GHz. It can therefore be used equally well to investigate safety in the near field region of long wave transmitters, make measurements on radio and TV broadcast transmitters, and determine exposure levels caused by the latest generation of mobile telecommunications services.
Reader Reply Card no 21 Reader Reply Card no 22
IET
Annual Buyers Guide 2010
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