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Maths and computation

For integration, square root extraction, summation, subtraction, multiplication, division, scaling and linearisation

The SIL range of signal converters for maths and computation functions extends to both analogue and digital type process signals.

Analogue types include:

  • Integrators for for continuous integration and totalisation of signals proportional to rate e.g flow
  • Root extractor - provides an output proportional to: the square root of the input signal, the input raised to the power of 3/2 or the input raised to the power of 5/2
  • Multiplication of two analogue signals
  • Summation (subtraction or averaging) of up to six inputs
  • Linearisers applies a pre-set curve to the input signal

Digital signal types include:

  • Dividers for integer division of pulse type inputs
  • Frequency scaler for scaling the frequency of the input signal by an adjustable non-integer number
  • Pulse summator (subtractor) - sums up to five digital (pulse) signals.

Integration

See analogue to frequency converter (Integrators)

Root extractor / Function generator
(square root, 3/2 law, 5/2 law)

B12-7

  • Provides Square root, 3/2 Law & 5/2 Law functions
  • Performs input / output signal conversion
  • 15 V sensor / loop supply option
  • High impedance mA output drive option
  • AC or low voltage (11-32 VDC, 12-24VAC) powered versions
  • Wall or DIN rail mounting
  • Module unplugs without disturbing wiring or breaking input current loops

Typical applications:
Square root: compute flow-rate from a differential pressure transmitter
3/2 Law: provide an output proportional to flow rate from a flume or weir level measurement signal
5/2 Law: provide a signal proportional to flow rate from a V notch weir level measurement.

square root extractor

Multiplier / Squarer

B12-12

  • Provides Output = (A + a) (B + b) x k + c, where A and B are inputs and a, b, c and k are constants.
  • Wide range of input and output types
  • High impedance ma output drive option
  • AC or low voltage (11-32 VDC, 12-24VAC) powered versions
  • Wall or DIN rail mounting
  • Module unplugs without disturbing wiring or breaking input current loops
analogue multiplier - squarer

Analogue summators/ averagers/ subtractors

B12-6

  • Sum or subtract up to three inputs
  • Performs averaging function with equal input ranges
  • Scaling of process values
  • High impedance output drive option
  • AC or low voltage (11-32 VDC, 12-24VAC) powered versions
  • Wall or DIN rail mounting
  • Module unplugs without disturbing wiring or breaking input current loops
  • Analogue circuitry used throughout
analog summator - subtractor

112-6A

As the B12-6 but will sum, or subtract - up to six inputs

112-6a Analogue Summator / subtractor

Linearisers

112-40 Digital lineariser

A non-microprocessor based unit which accepts a voltage, current or resistance input signal and provides an isolated current or voltage signal output. The output signal can follow a pre-programmed law. Provides for external switching between two laws and a multiplier input.
Wall or DIN rail mounting.

Digital lineariser

Frequency / digital dividers

112-25 Digital divider

  • User selectable division
  • Two decade (0-99) or Four decade (0-9999) versions
  • Four decade version has a further ÷10 or ÷100
  • Wide range of input signal types including voltage levels, mechanical switches, proximity switches and flow sensors.
  • Voltage pulse, relay or open collector outputs
  • Isolated output
  • Wall or DIN rail mounting

Typical application:; flowmeter scaling: output scaled to give one pulse per unit volume.

Digital divider image

Frequency scalers

112-26 Frequency scaler

  • Scales the frequency of the input signal by an adjustable non-integer number.
  • Transfer function= Fout = Fin x R ÷ N ÷ D
    R = 0.000 to 0.9999,
    N = any integer from 1 to 9999
    D = 1, 10, or 100.
  • User selectable scaling factor
  • Wide range of input types supported
  • Isolated voltage pulse, relay or open collector outputs
  • Transducer power supply
  • Wall or DIN rail mounting

Typical application: flowmeter scaling to provide one pulse per unit volume.

Frequency scaler image

Pulse summator / subtractor

112-60 Pulse summator

  • Sums up to five digital (pulse) signals.
  • Inputs opto-isolated
  • Open collector or 24V pulse output
  • Adder / Subtractor version available
  • No missing pulses - error free
  • Wall or DIN rail mounting

Typical application: summation of integrator pulses from several flow meters.

Pulse summator

Other units in our range performing maths, computation and linearisation functions include:-

Digital panel meters with user linearisation functions
See 500-TT Process display (programmable with alarms)...
See Tracker 212 and 220 universal input panel meters...

Universal input data aquisition modules
See Tracker 331 / 332...