BA304NG
2Pages

Safe area 2-wire 4/20mA 4 digit indicator Ex nA & tc certified for use in Zones 2 & 22 hazardous areas u Loop powered only 2-wire Tx u 4 digit 34mm high display. Shown with optional backlight - loop powered The BA304NG loop powered 4/20mA indicator is a new field mounting instrument that supersedes the well established BA304NC. It is electrically and mechanically compatible with the earlier model but has a much larger full 4 digit display, dust certification and guaranteed performance between -40 and +70°C. Like it’s predecessor, the BA304NG is housed in a robust IP66 enclosure which may be surface or pipe mounting. Main application of the BA304NG is to display a measured variable in meaningful engineering units within a Zone 2 or 22 hazardous area. The zero and span of the display are independently adjustable allowing the indicator to be calibrated to display any linear variable represented by the 4/20mA signal. A root extractor and an adjustable sixteen segment lineariser enable the indicator to display flow and variables such as tank level in linear engineering units. For weighing applications a tare function is included. A large 34mm high 4 digit display provides maximum contrast and has a very wide viewing angle, allowing the BA304NG indicator to be easily read in most lighting conditions over a wide temperature range. An optional factory fitted backlight is available for installations in poorly illuminated areas. The four digits, with three decimal points and a negative sign, may be configured to display any variable between -9999 and 9999. IP66 protection is provided by the robust GRP enclosure which has stainless steel fittings, silicone gaskets and an 8mm thick armoured glass window. Ingress and impact protection have been independently assessed by Intertek. An optional back-box terminal assembly, including a continuity diode in the 4/20mA loop, is available for users wishing to terminate field wiring before the indicator assembly is installed. The scale card which show units of measurement and tag information slides into an internal slot and can easily be changed on-site. New instruments are supplied with a printed scale card showing customer specified information, if this is not supplied a blank card is fitted which can easily be marked on-site. IECEx and ATEX non sparking Ex nA certification allows the BA304NG to be installed in Zone 2 hazardous area without the need for Zener barriers or galvanic isolators. For European and international Zone 2 applications the BA304NG offers a less expensive alternative to intrinsic safety and flameproof instrumentation. Ex tc dust certification permits the BA304NG to be installed in Zone 22 dust hazardous areas, again without the need for Zener barriers or galvanic isolators. A backlight which may be loop or separately powered is available as a factory fitted option. It provides green background illumination allowing the display to be read at night or in poorly illuminated areas. When powered from the 4/20mA loop, no additional field wiring is required. Powering from a separate supply produces a brighter backlight but requires additional field wiring. dust ATEX & IECEx certification. segment lineariser. u P66 GRP enclosure I u Easy scale card installation on-site. u Optional backlight & alarms. Optional dual alarm outputs which can switch hazardous or safe area loads, such as sounders, beacons or solenoid valves, are available as a factory fitted option. The two galvanically isolated solid state outputs may be independently conditioned as high or low alarms with normally open or closed outputs. Annunciators on the display show the status of both alarms. Reliability is ensured by protection from incorrect connection and radio frequency interference. The indicator has been subjected to extensive vibration and thermal testing and is supported by a three year guarantee. Other field mounting models in this range include the BA324NG which has a similar specification with a five digit 29mm high display plus a 31 segment bargraph. BEKA associates Ltd. Old Charlton Rd. Hitchin, Hertfordshire, SG5 2DA, U.K. Tel. (01462) 438301 Fax (01462) 453971 e-mail sales@beka.co.uk www.beka.co.uk

SPECIFICATION 4 to 20mA Less than 1.2V at 20°C Less than 1.3V at -40°C Less than 5V with optional loop powered backlight. ±200mA or ±30V will not damage the indicator. LEGEND PLATE Input Current Voltage Overrange (Function in display mode) Shows display with 4mA input Shows display with 20mA input Displays input in mA or as a % of span, has a modified function when alarms are fitted. Used for tare function Push buttons & * ( ) Liquid crystal, non-multiplexed 4 digits 34mm high. Adjustable between 0 & ±9999 for a 4/20mA input. Adjustable between 0 & ±9999 with 4mA input. 1 of 3 positions or...