BA627E
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BA627E 4/20mA manual set point station u Loop powered Shown with optional loop powered backlight The BA627E is a panel mounting set point station that enables the current flowing in a 4/20mA loop to be manually adjusted via the front panel push buttons from within the process area. It is a second generation instrument that is mechanically and electrically compatible with the earlier BA505C, but has more display digits plus additional functions. Main application of the BA627E is the adjustment of a 4/20mA plant parameter from within a process area. For example, as the remote set point generator for a speed controller or for positioning an actuator or valve with a 4/20mA input. The BA627E incorporates a five digit display plus a bargraph that may be calibrated to show the engineering units represented by the 4/20mA current, allowing an operator to easily set the process variable to the required value. Five pre-set output values may be rapidly selected using the instrument’s front panel push buttons for applications where the same output values are repeatedly required. To minimise plant disturbance when the output is adjusted or switched between pre-sets, the maximum rate of output current change may be defined. The 4/20mA output range may also be restricted so that an operator can only adjust the plant variable within safe limits. The bold 11mm high liquid crystal display provides maximum contrast and has a very wide viewing angle, allowing the BA627E set point station display to be read easily in most lighting conditions over a wide temperature range. The five digits, with four decimal points and a negative sign, may be configured to display any variable represent by the 4/20mA output current between -99999 and 99999. Engineering units represented by the 4/20mA output current are shown on the scale card viewed through a window on the right hand side of the display. If the units are specified when the BA627E is ordered a printed scale card will be fitted. If units are not specified, a blank card will be supplied which can easily be marked and installed on-site without dismantling the set point station enclosure or removing it from the panel. Display backlighting 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 the minimum operating voltage of the BA627E is increased. Powering from a separate supply produces a brighter backlight but requires additional field wiring. IP66 front panel protection and a neoprene gasket to seal the joint between the set point station and the panel make the instrument suitable for use in areas that will be cleaned with a hose. To simplify installation and maintenance, the set point station has a removable terminal block allowing panel wiring to be completed before the BA627E is installed. A BA490 panel mounting rotary encoder may be directly connected to the BA627E set point station to provide analogue control of the output current. Although the BEKA BA490 has been designed for this application, almost any quadrature encoder with a contact output may be used. u digit 11mm high 5 display & 31 segment bargraph. & BA490 external rotary encoder. u IP66 front u Easy on-site scale card installation. Reliability is ensured by component conformal coating, protection from incorrect connection and radio frequency interference. The set point station has been subjected to vibration testing and is supported by a three year guarantee. For applications in hazardous areas the BA427E, which has similar features as the BA627E, has ATEX and IECEx certification allowing installation in most gas and dust hazardous area. 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 Output Current Resistance DIMENSIONS (mm) 3.0 to 22.0mA Greater than 1MΩ Power supply Voltage 1 least significant digit of the display, or 0.3µA whichever is greater. Less than 2µA/°C Display Type Zero Span Liquid crystal, non-multiplexed 5 digit 11mm high with 31 segment bargraph. Adjustable between 0 & ±99999 with 4mA output. Adjustable between 0 & ±99999 with 20mA output. Decimal point Zero blanking Direction To achieve an IP66 seal between the instrument and the panel 90 +0.5 / -0.0 x 43.5 +0.5 / -0.0 6.1 to 30V 10 to 30V when optional backlight is loop powered. Accuracy...