CR:243/1 Noise Monitoring Terminal
The CR:243/1 is a Noise Monitoring Terminal designed for permanent installation, on either a fixed mast, such as the CM:425, or on a building. Normally, the CR:243/1 unit is used with the MK:426A Outdoor Microphone, which provides the acoustic signals to the main instrument, and allows fully automatic calibration using an electrostatic actuator system.
The CR:243/1 has been designed to be operational for many years, and therefore has significant weather protection as well as physical security. The CR:243/1 outer enclosure is constructed from glass fibre, and is resistant to most environmental pollutants that are found in most measurement locations. The enclosure is sealed to IP65 standards, and all connections to the unit are made by sealed, armoured conduit to prevent damage or water ingress.
The MK:426A Outdoor Microphone, designed as a partner to the CR:243/1 unit, also features double environmental protection. The unit incorporates an electrostatic actuator system to provide automatic calibration of the entire measurement chain.
Connection between the MK:426A and the CR:243/1 is usually by sealed, armoured conduit, again to provide the maximum environmental and physical security. The design of the CR:243/1 is to allow the instrument to operate unattended for long periods of time. Therefore the instrument can store large amounts of data internally.
When required, this data can be downloaded to the host computer. This allows dial up telephone lines to be used for communications, and means that the noise monitor need only be contacted when required, typically once every day. However, if communication cannot be made with the instrument, the large memory allows measurements to be made without loss of information.
The standard CR:243/1 can provide most of the parameters required for Environmental Noise Measurement, but these can be supplemented by various options and modules. Please contact Cirrus Research plc for details.
Advanced recognition templates are used to monitor specific noise events, and the multiple Environmental groups allow continuous measurement of the noise climate. The unit will also remove recognised noise events from the measured noise climate information, showing the impact of those noise events.
The instrument will also store and download diagnostic information, as well as any additional measurement functions that have been added to the standard unit
Many of the Cirrus Research plc environmental noise monitoring instruments are capable of support additional data inputs.
The most common of these is the measurement of weather conditions. The CR:243/1 and CR:243/3 units support directly external weather sensors. These sensors are available for the measurement of:
- Wind Speed & Direction
- Barometric Air Pressure
- Relative Humidity
- Air Temperature
- Rainfall Volume
This data is downloaded with the noise measurements as required.
An Environmental Noise Monitoring application using Cirrus Research plc equipment can be built as a modular system, with additional monitors and special measurements added as required. A range of software solutions is available to support the hardware.
The CR:243/1 and CR:245/3 instrument have been type approved with their associated accessories by the PTB in Germany. In addition to individual component type approval, systems have also been passed by the PTB after installation. This requires the entire system from the microphone capsule to the computer with the software to provide consistent, accurate information, and represent a significant achievement.
Further details of the PTB type approval are available on request from Cirrus Research plc.
For more details please contact Cirrus Research plc or your local Distributor.
Links: - Product Datasheets: CR:243/1 Noise Monitoring Terminal
- Product Datasheets: CR:243/4 "Noise Pole" Noise Monitoring Terminal
- Product Datasheets: CR:245/3 Portable Noise Monitor
- Product Information: CR:243/4 "Noise Pole" Noise Monitoring Terminal
- Product Information: CR:245/3 Portable Noise Monitor
