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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, 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
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):
  1. 1ms if output requency >50Hz
  2. 10ms if 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