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.
Quick links
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.
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 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
Linearisers
112-40 Digital lineariser (OBSOLETE)
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.
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.
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.
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.
Other units in our range performing maths, computation and linearisation functions include:-
Universal input data aquisition modules
See
Tracker 331 / 332...
