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, and 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. This is a great benefit to reducing the shutdown of production and improving maintenance efficiency.
High and Low Alarms
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.
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, and Accumulated 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 digits 10mm high LCD (continuously powered)
Accumulated Total: Displayed when the Accumulated Total button is pressed
Rate: 4 digits 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) watertight
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 alarms.
Switching Power: 200mA, 30Vdc maximum
Saturation Voltage: 0.8Vdc typical across the output in the "on" state
Isolation: Both outputs are separately optoisolated
Pulse Duration (for pulse output):
- 1ms if output frequency >50Hz
- 10ms if the 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
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
