• D-R 216 Continuous in-situ skoke density measurement instrument according to principle of transmission.
• Easy application
• Installation without calibration
• 0,4 - 6.25m measuring path length
• 0-25, -50, - 100% opacity
• Typical applications: Opacity measurement in Heating Stations, Power Plants, Refineries etc.
• Type tested for plants according to “TA Luft”

The instrument applies the 2-beam alternate light method following the autocollimation principle, i.e., the light beam crosses the measuring section twice. The unit measures and evaluates the light beam's weakening caused by the dust content within the measuring section. An electromagnetically actuated rotary diaphragm switches between the measuring beam and a comparator light beam. For check value compensation, comparative measurings of 2 seconds duration each occur every 64 sec. A photocell alternatingly receives the measuring and the comparator light beam. There is only one joint amplifier for the measu-ring and the comparator beams, thus compensating for light bulb and photoelement ageing, for temperature influences as well as for amplifier long-time drift. The emitter light being modulated with 25 Hz, no daylight influences will occur. A separate purge air fan keeps the heated optical boundary surfaces free from soiling. Optional: Automatic cutoff system with prealarm. The cutoff threshold value can be adjusted over the entire measuring area.

Typical application fields are monitoring tasks in

heating plants, industrial boiler plant,s barracks, hospitals, schools, etc.,
garbage and waste incinerators
monitoring dust extraction and filtering systems
process controlling in the chemical industry.

According to Circular Letter Ull 8556134/4 of the FMI dated 18.9.1978, the D-R 216 Smoke Density Meter is suitable for monitoring gaseous and dustlike emissions.

Type tested to the guidelines for emission measuring equipments of the Federal Ministry of Interior
- FMI Circular Ull 8-556134/4 dated 18.9.1978 by TÜV Rheinland Technical Inspection Agency, Test Reports # 936/808016 of 15.2.79 and # 936/804004 of 7.2.85

Itemized in the list of suitable instruments for continuous registration of emissions - Joint Gazette # 22 of 26.7.1985 of the Federal Ministry of Interior.