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202A Loop Powered Rate Totaliser

Contrec 202D Field Mounted Rate TotaliserThe 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):
  1. 1ms if output frequency >50Hz
  2. 10ms if the output frequency is 5 to 50Hz
  3. 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

Contrec's 202D Rate Totaliser Dimenstions