HEATING, VENTILATION & AIR CONDITIONING
(propene) and R600a (isobutane) present zero ODP and low GWP ratings. However, they are rated to A3 standard, i.e., highly flammable. This means that fresh solutions are required for the components used in the design of heat pumps, air conditioning and refrigeration systems. These considerations are even more applicable in the case of extremely flammable hydrogen boilers. A potentially explosive atmosphere exists
when a mixture of air gases, vapours, mists, or dusts combine in a way that can ignite under certain operating conditions. Across Europe the equipment and protective systems intended for use in potentially explosive atmospheres (ATEX) cover a range of products, including those used on fixed offshore platforms, petrochemical plants, mines, and flour mills, amongst others. Explosion-proof relays, switches and similar devices come under the regulations of IEC60335-2- 40 ‘Particular requirements for electrical heat pumps’. With air conditioners and dehumidifiers, the IEC 60730 / UL508 regulations expand applications for flammable refrigerants such as R290. When it comes to real life usage, specific
regulations apply to varying types of applications, from transport refrigerators, through chillers and air conditioning, to heat pumps and hydrogen boilers. This in turn, makes it necessary to develop fresh solutions that deliver protection whilst addressing market needs.
EXPLOSION-PROOF RELAYS Amongst the early gains are the certifications of sealed and unsealed relays that have already gained approval to VDE IEC60079-15. In one example, Omron’s G5NB is a miniature
relay with 1-pole 5A/7A switching capability and 10kV impulse withstand voltage. Its highly efficient magnetic circuit provides high sensitivity of 200mW. This standard model conforms to UL/CSA/VDE standards and satisfies EN61010 reinforced insulation requirements. The G5Q miniature power relay is a single-pole
component with 10A switching capacity and excellent switching performance for a variety of loads. It is small yet provides 8kV impulse withstand voltage (between coil and contacts). Low coil power consumption. G2RL is a low-profile PCB power relay with
15.7mm height, ideal for incorporation in miniature types of equipment. A wide variety of single-pole, double-pole, high-capacity (16 A) type, and
Samira Amani
“The world is beginning to phase out its use of fossil gas boilers in favour of heat pumps
and alternative fuels. This brings in new challenges with the need to identify solutions that mitigate the impact of global warming, while ensuring safety of heating and cooling plant”
high-sensitivity type (250mW) relays are available. G2RL satisfies ambient operating temperature requirements of 85°C and 105°C (-CV Model). Clearance and creepage distance: 8mm/8mm min. Low power consumption of the G5NB and G5Q’s ensures less heat is generated and this makes them ideal for high-efficiency operations. The G5NB and G5Q relays can be used in a wide range of consumer, commercial and industrial applications with explosion-proof, glow wire, high witching and high inrush type relays. G5NB, G5Q and G2RL relays are approved for use
with the increasingly hazardous situations involving hazardous fuels and refrigerants. VDE Explosion protection proofing to IEC/EN60079-15 is provided for both sealed and unsealed devices. with further approvals ongoing on motor loads. Additional approvals include VDE Glow Wire EN60335-1 and IEC/EN 60335-1 conformed. (-HA Model).
MINIATURE RELAYS Alongside sealed standard relays, the miniature power relays like G6RN provide 8A switching 250VAC with a low-profile height of 15 mm. It also features high sensitivity with 220mW power consumption, high insulation with an insulation distance of 8mm and impulse withstand voltage of 10kV between coil and contacts. G6RN satisfies the ambient operating temperature requirement of 85°C and the standard model conforms to VDE standards. Under development, the G6RN relay family will introduce an unsealed model –EL1, and its sealed counterpart –EL2. Both will carry approval to VDE Explosion protection proof IEC/EN6007915 and VDE Glow Wire EN60335-1 standards.
SEALED MICROSWITCHES New versions of ultra-subminiature basic
switches sealed to IP67 will also prove ideal for safe operation in proximity with highly flammable fluids. Models with sliding contact construction feature a long stroke and provide high reliability along with high insulation performance. Omron sealed microswitches are available for signal current up to 5A depending on the size, while all models can be provided with moulded lead wires.
MEMS SENSORS KEEP AIR FLOWING Monitoring air flow and air pressure ensures the correct and optimal operation of heat pumps, refrigeration plant and air conditioning systems, enhancing combustion efficiency in boilers, and supplying feedback control of air conditioning by measuring the amount of air and amount of ventilation. High accuracy D6F-PH pressure sensors and
2SMPP gauge pressure sensors support the diverse needs of air flow measurements. They could also be used for clogged filter detection and support predictive maintenance solutions. Velocity-type D6F-V and D6F-W sensors save energy with airflow sensing, whilst optimising air conditioning control without sacrificing quality.
NEW SOLUTIONS The world needs to find new solutions that mitigate the impact of global warming, whilst ensuring safety of heating and cooling plant. Omron is committed to developing and promoting technologies that conserve resources and the environment.
Omron Electronic Components
https://industrial.omron.co.uk
https://omron-electronic-components-europe.videomarketingplatform.co/atex-approved-omron-components-for/join?source=share
www.essmag.co.uk
ENERGY & SUSTAINABILITY SOLUTIONS - Spring 2023
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