Parking ventilation:CO monitoring, sensor

selection and topography

Parking area: Measuring parameter

Measuring parameters need to be measured and controlled, at parking area:• CO (carbon monoxide) for petrol vehicles• CO (carbon monoxide) and NO2 (nitrogen dioxide) for diesel vehicles

It is advisable to measure and monitor NO2 if parking area caters to diesel vehicles also.

Calculation of No. of Sensors / Measuring points:

• Number of CO sensor depends on many factors, such as:– Floor area of parking space:

– Load at Exit & Entry to parking space: N = N+1 ,for exit and entrance (only one more if exit, entrance are same)

– Parking space to be used by public or bulk transport vehicles: N = N +1, at unloading bay.

Where N = no. of CO sensor, L = length of parking space ( in mtr), W = width of parking space ( in mtr), A = area of parking space ( in sq mtr)

Selection of sensor technology:

Sensing technology available:– Infra-red based– Electro-chemical based– Solid state semiconductor based

Infra-red based sensor (Not Available for all Gases) provide high accuracy but are expensive, while solid state Sensors are cheap but provide false readings, high gas cross-sensitivity, produce false alarm.

Connection topography: Star Connection for analog system

Controller / PLC

CO Sensor 1

CO Sensor 2

CO Sensor 3

CO Sensor 4

Connection topography: Bus Connection for digital system

Controller / PLC

CO sensor 1

CO sensor 2

CO sensor 3

CO Sensor 4

Consultant or system designer can choose and design:• Branch topology• Tree topology

Connection Topography design & selection:

Sensors (Measuring Points) + Controller / PLC / BMS/ SCADA system

Topography preference/recommendations• Star connection if sensors < 20• Bus connection if sensors > 20

Bus connection will drastically compensate the cost of digital system, and ease of managing/controlling the sensors, hence overall cost of project will come down as compared to analog system.

MSR Electronic Analog system:

MSR CO Sensor MA-0-1110– 0-300 ppm meas. Range, Electro-chemical technology based sensor– Continuous monitoring– Poisoning stable– Modular plug-in technology – for PCB, sensor element, enclosure– Reverse polarity, Overload protected– IP44 protected enclosure– 4 – 20 mA analog signal output (Standard)– Response time t90 < 50 sec

MSR Electronic Analog system:

MSR Analog controller MGC-04 series– Suitable for monitoring CO, CO2, NO, NO2, NH3, O2, SO2, H2S, CL2,

ETO, combustible and refrigerant gases– Auto diagnostic watch dog with built-in error codes, fault LEDs– Five adjustable alarm thresholds for each channel– 4 alarm relays with SPDT, potential-free, max. 250 VAC, 5A– analog outputs, 4 - 20 mA– IP 65 protected enclosure– Can control up to 4 meas. Point in basic model, up to 24 measuring

points with help of expansion modules

MSR Electronic Digital system:

MSR Analog / Digital Sensor ADT-03-1110– 0-300 ppm (50-2000 ppm optional) meas. Range , Electro-chemical technology

based– Digital measurement value processing incl. temperature compensation– Serial interface RS-485 with modbus option– Continuous monitoring– Low zero point drift– Good stability to poisoning– Long life sensor, Modular plug-in technology, Easy maintenance– Reverse polarity protected, overload and short-circuit proof– (0) 4 - 20 mA / (0) 2 – 10V analog signal output, jumper selectable– IP65 protected

MSR Electronic Digital system:

MSR Digital Controller DGC-05 series– up to 98 meas. Point in bus configuration– For monitoring CO, CO2, NO, NO2, NH3, O2, SO2, H2S, CL2, ETO combustible-

and refrigerant gases– Auto diagnostic watch dog with built-in error codes, fault LEDs– Serial interface RS-485, with modbus option– Five free adjustable alarm thresholds for each transmitter– 4 relays with SPDT, potential-free, max. 250 VAC, 5A– Fault relay with SPDT, potential free, max. 250 VAC, 5A– 4 analog outputs, 4 to 20 mA

Contact Us:

Vinod Gogoriya Mob: +91 – 99833 45452

Email: vgogoriya@gmail.com

Website: www.msr-electronic.de