Super User 202A Loop Powered Rate Totaliser The 202A Loop Powered Rate Totaliser from Contrec has been designed to operate with any flowmeter which produces a 4-20mA output, including differential pressure devices, magnetic or vortex flowmeters. The 202A is powered entirely from the 4-20mA current loop and has a maximum of 2.5 volts drop across the input. The Rate Totaliser is fully programmable with linear or square law input relationships, programmable span, cutoffs and conversion factors. A non-volatile memory stores all set up parameters and totals without the need for internal batteries or external power. High and low alarms are standard via optically isolated solid state relay outputs. Alternatively, the high alarm output can be programmed to provide a scaled pulse output proportional to the total. Intrinsically safe The Model 202A is certified as intrinsically safe to European ATEX/IECEx standards, and CSA US/C standards for both the USA and Canada. Watertight field mounting enclosure The 202A Rate Totaliser is housed in a rugged, yet attractive, IP67 (Nema 4X) polycarbonate enclosure which is completely watertight. This enables the instrument to be mounted directly on the flowmeter, panel mounted or wall mounted using a special universal bracket. A 51mm pipe mounting bracket is also available. Fully user programmable K-factor, decimal point positions, filter constants and time base are fully user programmable. Rate and Totals can also be displayed in different engineering units such as gallons per minute and barrels. Using Contrec's unique magnet access strip allows the 202A to be re-configured in hazardous areas without opening the enclosure. The is a great benefit to reduce shutdown of production and improves maintenance efficiency. High and Low Alarms Alarms are standard via optically isolated solid state relay outputs. Alternatively, the hight alarm output can be programmed to provide a scaled pulse output proportional to the total. Frequency to Current Conversion The 202A loop powered Rate Totaliser makes an excellent Frequency to Current Converter, particularly for low frequency inputs from positive displacement or turbine flowmeters. Because the 202A rate totaliser calculates the flow rate by measuring the time interval between input pulses, it is able to provide a very stable and accurate 4-20mA output for low frequency inputs. 202A Analogue Rate Totaliser Features at a glance Powered by 4-20mA loop Displays Rate, Total andAccumulated Total Linear or square law inputs High and low flow rate alarm Pulse output Watertight to IP67 (Nema 4X) Wall, pipe and panel mounting Intrinsically safe Fully programmable CE Compliant 202A Display Information Type: LCD display Total: 7 digit 10mm high LCD (continuously powered) Accumulated Total: Displayed when the Accululated Total button is pressed Rate: 4 digit 8.5mm high LCD (continuously powered) Span: The units of measure (eg. gallons/sec) is programmable up to 999,999 Decimal Points: Decimal point positions are fully programmable for Rate and Total Time Base: Span can be programmed in units per second, minute, hour or day Frequency Range: 0.01Hz to 10kHz Signal Type: 4-20mA Interface: CE Compliance 202A Rate Totaliser Physical Information Operating Temperature: -20°c to + 60°c Enclosure Dimensions: 98mm x 151mm x 43mm Protection: IP67 (Nema 4X) water tight Cable Entry: by cable glands Materials: Polycarbonate and ABS Mounting Options Wall: Universal wall mount bracket Pipe: A galvanised metal bracket enables the 202A to be attached to a 51mm vertical or horizontal pipe Panel: Two mounting brackets are provided and terminals are accessible on the rear of the enclosure. Note: panel mount version is not watertight. Alarm / Pulse Outputs Types: 2 x solid state relay outputs suitable for driving DC solenoids or external relays. The outputs provided high and low alarms; or pulse output and low flow alarm. Switching Power: 200mA, 30Vdc maximum Saturation Voltage: 0.8Vdc typical across the output in the "on" state Isolation: Both outputs are separately opto-isolated Pulse Duration (for pulse output): 1ms if output requency >50Hz 10ms if output frequency is 5 to 50Hz 100ms if output frequency is < 5Hz 202A Power Options 4-20mA Powered Input Resolution & Linearity: 0.05% of span Accuracy: 0.05% of span at 25°c 0.1% (typical) of span, full temperature range Update Time: 0.5s Connection: 2 - wire Voltage Drop: 9V maximum 202A Rate Totaliser Hazardous Area Information Type of Approval ATEX: Rating - II 2G Ex ia IIB T4 Gb / Cert No. BVS 15 ATEX E 106 X IECEx: Rating - Ex ia IIB T4 Gb / Cert No. IECEx BVS 15.0099X CSA US/C - Rating - Class 1, Group C & D / Cert No. 104840-5 Intrinsically Safe Parameters Maximum Ambient: 60°c Maximum Input Parameters: 4-20mA: Ui - 28V / Ii = 93mA / Pi = 653mW Maximum Output Parameters: 4-20mA: Ui - 28V / Ii = 93mA / Pi = 653mW 202A Dimensions
