Monitors environmental noise continuously for up to 3 weeks.

Calculates and stores over 7500 sets of Ln indices plus Leq.

Portable, self contained and completely weatherproof.

Continuous 90dB dynamic range.

'A' and 'C' frequency weightings.

Date, Time, Lmax, Lmin,  Leq, 8 user selectable percentiles, Battery , Temp.

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 allows 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.

Loggers are available for hire and we offer a full-set up/retrieve and reporting service