DUST DENSITY METER

Model DDM - 2001

SALIENT FEATURES

Text Box: FIBER OPTIC

 

Detector of DDM-2001 is separated from main body by fiber optic cables to keep the electronics safely away from extreme environment inside chimney/stack.  

 

 

Light scattering method  

Even small amount of dust can be easily detected with high sensitivity

No deviation of light axis  

Detectors are located on the same side  eliminating deviation of light axis

Built-in air purge

Continuous air purging facility allows long time maintenance free operation

High accuracy

Steady light cycle and synchronous signal processing ensure high accuracy

Span and auto-zero adjustment

Steady light cycle and synchronous signalprocessing ensure high accuracy

Useful data outputs

Analog & digital outputs are available to save/process measured data

Minimal running cost 

Expendable parts are limited to spare lamps and motors only

 

Use in adverse environment

Detector can withstand high temperature and high pressure 

DESCRIPTION

 

 

All over the world, environment protection agencies have enhanced pollution control regulations and the minute sized particles called SPM (Suspended Particular Matter) in dust discharge from industrial chimney or stack is now being strictly regulated. Most industries use EP and bag filters to prevent discharge of SPM but to comply with the regulations, it is necessary to supervise the  everyday performance of such pollution control devices to ensure that “dust density" remains below the level specified by law/regulation.  

 DDM-2001 is a new type of on-line pollution monitoring system that continuously detects and indicates the dust density in exhaust gas discharged from industrial chimney or stack. It has been developed using advanced dust collection technologies that support the solution of SPM (Suspended Particular matter) problems. DDM-2001 adopts reliable light scattering method for continuous detection with high sensitivity and without any bothersome adjustments. Remote fiber optic detector and built-in air purging facility ensure long time maintenance free operation.

 

APPLICATIONS

DDM-2001 is an indispensable system for factories that have large furnaces/kilns. N case dust density is higher than preset level, it provides an immediately alarm to the operator for corrective action like replacement of filter bag thus preventing major pollution accident. Data can be saved as evidence and and later analyzed for more efficient preventive measures in the future.

MEASURING PRINCIPLE
 The main body has a light source, CPU and light receiving circuit. Light generated by light source is sent to transmitter of detector through optical fiber cable. Light emitted by the transmitter into the duct is reflected by the dust particles and scattered light is received by receiver of detector and sent to light receiving circuit of main body through optical fiber cable. Microprocessor processes this receiving signal and gives 4~20mA output corresponding to dust density in duct. RS-232C output is also available. Purging air from purging air control box is supplied to detector unit through specially designed peculiar air purge system to ensure that the silicon lens is always clean. Zero adjustment is automatic and span adjustment can be done using calibrator supplied along with system even while plant is running. High level alarm, Lamp failure alarm, Motor failure alarm and low voltage alarm are the standard feature.
 

SPECIFICATIONS:

[MAIN BODY]

Principle of operation: 90°backward scattering Method

Measuring range: 0 ~ 1000 mg/Nm3

Light source: Halogen Lamp

Output: 4~20mA, DC with RS-232C port

Optional Output: O2 Covert Output & Moving average output

Indicator: 0~100% Scale ammeter [Analog & Digital]

Zero Adjustment: Automatic

Span Adjustment: Through Calibrator

Alarm output: High Level, Lamp failure, Motor failure,  Low / No voltage alarm built-in

Integration time: 5~100 sec adjustable

Temperature Stability: ±2%/10°C

Long Time Stability: ±2%/Week

Ambient Temperature: -10 ~ 50°C

Power supply: 230V ± 10%, 50Hz

Weight: Approx 45Kg

Size: 500 X 670 X 270 mm

[DETECTOR]

Material: SS304 [SS316 / SS310 at extra charge]

Surface treatment: Heat proof coating

Structure: Quartz glass is used to isolate measuring zone & Fiber cable

Mounting: In 200X65 mm rectangular cut in duct

Ambient Temperature: 380°C

Weight: Approx 5Kg

 

 Few Installation Places

 

       Chimney Bag Filter Exit

  

Blast Furnace Exit

  

Stack Inlet

  

EP Exit Chimney