26 April

Carbon monoxide monitoring & control system for parking ventilation

By ALVI Tags: Carbon monoxide monitoring & control system for parking ventilation, CO Gas Sensor

Carbon monoxide and Very early smoke & fire sensor (VEFSA) transmitter

(Better monitor CO and CO+ which will solve the purpose of fire & Smoke monitoring as well as CO monitoring)

specifications:

Should be capable of detection, measurement and monitoring of carbon monoxide and Carbon monoxide gas radicals
Should have Electro-chemical type sensor cell
Should have Gel based Electrolyte in the sensor cell
Should have 0-300ppm measuring range, taking care over-rangenge detection.
Should have high accuracy, high repeatability , high reliability
Should have a coverage area of 700-750 m2
Should a be 2-wire loop powered connection for power supply and signal output.
Should analog output: 4-20mA (standard), 2-10V (3-wire loop) (optional)
Should have linear, proportional
Should have low response time: T₉₀ < 50 sec
Should have accuracy of ≤ 3% of measuring range.
Should have low warm up time, ≤ 3 mins
Should have Low voltage operation: 24V AC / DC
Should have low power consumption: 22 mA, max. (0.6 VA)
Should not be cross-sensitive to gases like SO2, acetone, ammonia, Carbon dioxide, Nitrogen dioxide, Nitric oxide.
Should be wall mountable without need of further mounting brackets etc.
Should have plug-in, easy replaceable sensor cell (simple push – pull arrangement) and PCB for easy service and replacement (no need to change the whole unit)
Should have auto recovery to zero point
Should have life expectancy of > 5 years, replaceable sensor cell
Should capable of mounting in any direction, with no effect on performance, output and life of these sensors (no orientation problems)
Should have poisoning protection, against background gases, lead vapours, dust etc
Should have overflooding protection
Should have reverse polarity and short circuit protection
Should have manual trimpot calibration facility, with annual calibration frequency
Should capable for field calibration
Should have atleast IP44 protected housing, with the provision of dust and moisture protection with hydrophobic filter arrangement.
Should have fast response time
Should have IMMUNITY TO RF/FM INTERFERENCE as per the guidelines of EMC- Directive 2004/ 108/ EEC, CE
Should have enclosure flammability in accordance to UL 94: VO

Central monitoring cum control system:

Should be based on PLC or microprocessor based system with pre-defined logic retention capacity.
Should have LCD or LED Display
Should be able to expand analog input channel with help of slave or expansion module. No need to replace or change whole monitoring system
should have free configurable set points at every channel input
Should have facility to temporary disable any channel with key press or control device, for maintenance mode etc.
Should have sufficient potential free (230VAC, 5A) relays. Should able to expand number of relays with help of slave / expansion modules.
Relays should be capable of soft program, with one-to-one, one-to-many, many-to-one configuration with any channel set-points.
Should be provided with contactor arrangement for operation, protection of exhaust fans, etc
Should have overload protection arrangement
Should have fault LED
Auto-diagnostic watchdog with built in error code, fault LED indication informing about the type of system error/fault
Should have password for protection against any un-authorised system access.
Simple English Menu driven (system error, status alarm, status relay, MP parameter etc)
Configurable relay parameters: energized, de-energized, latching, non-latching
Should have provision / option for BMS integration via digital network.

Control & warning logic:

CO concentration	Action
0-35 ppm	No action. Display readout
>35ppm	Start fresh air & exhaust system (to reduce gas concentration) (lower speed)
> 60ppm	Start fresh air & exhaust system (higher speed)

Control & warning logic: (with CO and CO+ monitoring for CO, fire and smoke )

CO concentration	Action
0-35 ppm	No action. Display readout
>35ppm	Start fresh air & exhaust system (to reduce gas concentration) (lower speed)
> 60ppm	Start fresh air & exhaust system (higher speed)
>200ppm	Send signals to fire alarm system and stop fresh air system