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ProductsDM4 Open Path Dust Monitor
The DM4 Open Path (OP) dust monitor is designed for long distance monitoring in ambient air and monitoring of production halls. Measurement lengths of up to 400 m are possible. Based on well-proven diode laser technology, this online instrument has a number of unique features.
Features
The monitor consists of a transceiver, retro-reflector, and electronics unit. These are protection classified for outdoor use. Measurement readings are provided through standard 4-20mA current loops or an optional fibre-optic output. Dust is easily measured at different path lengths by entering the selected distance.
Measuring principleThe DM4's optical measuring principle is based on the property of particles to absorb incident light. A red laser light beam is transmitted between transceiver and retro-reflector. A detector inside the transceiver unit detects the amount of direct light transmitted. The signal will depend on the number of dust particles present in the measurement path so that dust concentration can be calculated.
Installation and OperationThe DM4 OP monitor is easy to install using a special x/y alignment platform or tripod for the transceiver and rigid platform or tripod for the retro-reflector. The instrument contains no moving parts, thereby limiting preventive maintenance to visual inspection and cleaning of optical windows. Purging with instrument air prevents dust from fouling the optical windows. Upon installation calibration against an extractive reference method is important to ensure that different types of dust with different optical properties are measured correctly.Data sheet for downloadDM4 Open Path Dust Monitor (Acrobat) (.pdf)
NEO Monitors is a subsidiary of Norsk Elektro Optikk A/S
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