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ELECTROMECHANICAL GAS DETECTION SENSORS (CiTiceLs) FOR MEASURING THE CONCENTRATION OF A SPECIFIC GAS OR GASES. THE SENSORS ARE BATTERY-SIZED COMPONENTS. SENSORS OPERATE ON AN ELECTROMECHENICAL PRINCIPLE, WHEREBY DIFFUSION OF THE TARGET GAS INTO THE SENSOR WILL INITIATE A CHEMICAL REACTION, RESULTING IN A SMALL ELECTRICAL CURRENT BEING GENERATED. THE ELECTRICAL CURRENT IS MEASURABLE AND PROPORTIONAL TO THE GAS CONCENTRATION. SENSORS ARE MANUFACTURED TO MEASURE SPECIFIC GAS TYPES.

GAS MEASUREMENT SYSTEM. (IRIDIUM AUTOMOTIVES MEASURING SYSTEM). TO PROVIDE THE COMPONENTS TO MEASURE 3, 4 OR 5 GASES IN AUTOMOTIVE EMISSIONS. THIS IS ACHIEVED THROUGH A MIX OF INFRARED AND ELECTROMECHANICAL SENSORS. THE INFRARED SENSOR (KNOWN IN THE INDUSTRY AS A BENCH) MEASURES THE CONCENTRATION OF CARBON DIOXIDE AND HYDROCARBONS WITHIN A GAS SAMPLE. THE CONCENTRATIONS OF OXYGEN AND NITRIC OXIDE ARE MEASURED USING ELECTROMECHANICAL SENSORS IF REQUIRED.

COMBUSTIBLE GAS SENSORS. CATALYTIC BEAD GAS SENSORS (CiTipeLs) FOR MEASURING THE CONCENTRATION OF COMBUSTIBLE GASES. THE SENSORS OPERATE ON THE CATALYTIC BEAD PRINCIPAL, WHEREBY TWO BEADS ARE USED. EACH CONSISTS OF A PLATINUM WIRE COIL COATED IN A CATALYST MATERIAL. ONE BEAD IS REACTIVE TO COMBUSTIBLE GASES (DETECTOR) AND THE SECOND IS INERT (COMPENSATOR) AND PROVIDES A REFERENCE TO ENVIRONMENTAL CONDITIONS, WHICH CAN EFFECT THE OUTPUT. WHEN MOUNTED IN A WHEATSTONE BRIDGE ELECTRICAL CIRCUIT WITH AN INSTRUMENT, THE ELECTRICAL POWER HEATS THE ELEMENTS TO A POINT WHERE COMBUSTIBLE GASES CAN BE OXIDISED ON THE DETECTOR. WITH NO GAS PRESENT, THE RESISTANCES OF THE TWO ELEMENTS ARE IN BALANCE, BUT IN THE PRESENCE OF GAS, THE TEMPERATURE AND HENCE THE RESISTANCE OF THE DETECTOR CHANGES. THIS CAN BE MEASURED AND IS PROPORTIONAL TO THE GAS CONCENTRATION. THE GAS SENSORS ARE SOLD AS A COMPONENT TO OEM EQUIPMENT, THAT INCORPORATE THE SENSOR FOR GAS MONITORING AND MEASURING APPLICATIONS.

MASS FLOW CONTROLLER (MFC). THIS ELECTRONIC PRODUCT IS USED TO MEASURE AND CONTROL THE FLOW OF GAS. WHEN GAS FLOWS THROUGH THE MFC, TEMPERATURE CHANGES ARE DETECTED BY THE THERMAL SENSOR. THIS TEMPERATURE GRADIENT IS USED TO COMPUTE THE MASS FLOW RATE. THE MFC CAN PROPORTIONALLY CONTROL THE FLOW RATE OF GAS TO A GIVEN FLOW SET POINT.

THIS PRODUCT IS AN ANALOGUE-ADDRESSABLE FIXED TEMPERATURE HEAT DETECTOR OPERATING AT 83 DEGREES CELSIUS, AND WHICH UTILISES A HIGHLY LINEAR THERMISTOR CIRCUIT WITH THE THERMISTOR MOUNTED EXTERNALLY. THE HEAT DETECTOR COMPRISES A CIRCULAR LOW-PROFILE ABS-TYPE PLASTIC CASING CONTAINING METAL FASTENINGS AND CONNECTING TERMINALS PLUS A POPULATED PRINTED CIRCUIT BOARD WITH THE THERMISTOR CONNECTED AS A SENSING ELEMENT, TOGETHER WITH AN EXTERNAL 360-DEGREE LIGHT EMITTING DIODE (LED). THE PRIMARY FUNCTION OF THIS PRODUCT IS THE DETECTION OF HEAT. THE HEAT DETECTOR CANNOT BE USED ON ANY STAND-ALONE BASIS, IT IS ONLY USABLE WITH THE NITTAN NFU-7000 RANGE OF FIRE ALARM SYSTEM CONTROL PANELS. THE EXTERIOR LED FITTED SERVES ONLY TO INDICATE WHEN THE DETECTOR IS BEING QUERIED BY ITS CONTROL PANEL OR WHEN THE DETECTOR IS IN ALARM MODE. IT ISN'T INTENDED TO SERVE AS A VISUAL WARNING OF FIRE TO ANY PERSONS NEARBY AND PLAYS NO PART IN THE SENSING FUNCTION OF THIS PRODUCT. NO QUANTITATIVE, CHEMICAL OR SPECTROSCOPIC ANALYSIS IS CARRIED OUT BY THIS PRODUCT. THIS PRODUCT IS IMPORTED SPECIFICALLY FOR NITTAN EUROPE LIMITED, IT MUST NOT BE RE-SOLD AS AN "OFF THE SHELF" ITEM BY GENERAL STORES OR BY ANY NON-SPECIALIST OUTLETS. THIS PRODUCT DOES NOT CONTAIN AN INTEGRAL RECORDING DEVICE NOR ANY AUDIO-VISUAL WARNING EQUIPMENT. THE HEAT DETECTOR IS COMPLIANT WITH UNDERWRITERS' LABORATORIES (UL) STANDARDS. IT MAY BE SOLD SINGLY IN A SMALL CARDBOARD BOX BUT IS MORE COMMONLY DESPATCHED WITHIN LARGER CARDBOARD CARTONS CONTAINING 10 OR 100 UNITS.