a75
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Advisor A75 Universal process input panel meter Programmable input range Optional transmitter supply 2-wire Tx Optional 4-wire transducer supply u 4 digit LED display with adjustable brilliance. u 2 selectable process 1 The Advisor A75 is a universal panel meter for displaying process variables in engineering units. In addition to the features offered by the fixed range A70, the A75 has twelve on-site selectable process voltage and current inputs. The meter is housed in a robust enclosure with high quality pushbuttons, display and terminals and will provide many years of reliable service. Main application of the A75 is to display a current or voltage such as 4/20mA or 0/10V in engineering units. Twelve different input ranges can be selected, and the meter may be calibrated to display the input in any linear engineering units such as level, pressure or position. For flow applications the A75 includes a selectable root extractor to linearise the display. Optional accessories which further extend the applications include an isolated supply to power a remote 2-wire transmitter, a four wire transducer power supply, a 4/20mA isolated output proportional to the display, and two alarms. To prevent operators being dazzled, the display brilliance is continuously adjustable from the front panel. Calibration and programming is performed via the four front panel push-buttons which ‘click’ when operated. To prevent accidental or unauthorised adjustment, the programming functions are contained in easy to understand menus protected by a four digit user definable security code. All the instrument functions are programmable. The display can easily be recalibrated on-site using the internal references or an external voltage or current source. Loss of power does not affect calibration as all settings are retained for at least five years after power loss or disconnection. The front panel is a robust, easy to clean Noryl moulding sealed with a non-reflective, scratch resistant polyester membrane. All A75 panel meters have a captive neoprene gasket which provides an IP65 seal between the enclosure and the panel, thus making the instrument suitable for installation in panels which are frequently hosed down. The transmitter power supply is an optional fully isolated dc supply which may be used to power any external instrument which consumes less than 22mA. It is primarily intended for energising remote loop powered 4/20mA temperature or pressure transmitters. An optional four wire power supply is available for powering remote bridges, enabling the A75 panel meter to display linear weights and pressures without the need for a separate transmitter. The sensing wires eliminate the effect of cable resistance, and five different output voltages may be selected by the position of an internal link. A 4/20mA current proportional to the A75 display is obtainable from the optional re-transmitted output. This current is fully isolated and may be programmed to represent any part of the display. For weighing applications an optional Tare Function modifies the operation of the front panel push-buttons so the display may be zeroed at any input. The initial reading is therefore automatically subtracted from subsequent readings. A front panel LED is illuminated when the tare button has been operated. Optional alarms provide two channels each with a relay output which may be independently programmed as a high or low trip. The alarm set-points are adjusted via the front panel push-buttons and may be accessed from the display mode via a separate security code. Separate front panel LED annunciators show the status of each alarm. Reliability is ensured by an ISO9001 approved quality control system. The A75 is protected from reverse connection and overrange inputs, and incorporates extensive radio frequency filtering to comply with the European EMC Directive. A single range panel meter is also available, see datasheet for Advisor A70. voltage and current inputs. u Maximum & minimum display. Transmitter power supply. Transducer power supply. Tare function enclosure with easy to clean IP65 front. 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.u

SPECIFICATION Supply Voltage Recommended panel cut-out Display Type digit LED 14.2mm high with adjustable 4 brilliance. Zero Adjustable between -1999 and 9999 Span Adjustable between 0 and ±11989 Decimal point 1 of 4 positions selectable or absent Zero blanking Only 1 leading zero is displayed Polarity Automatic minus sign Overrange Displays -1 or 1 Reading rate Greater than 2 per second To achieve an IP65 seal between the instrument and the panel 90 +0.5/-0.0 x 43.5 +0.5/-0.0 Push-buttons In operating mode without accessories Down ▼ Shows display at minimum input Up ▲ Shows display at...