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Narrow Universal Data Logger (NUDL)

Supplier: Sphere Systems

The Narrow Universal Data Logger is designed for remote, low power applications. It has four analogue inputs that allow 12 bit resolution, can generate alarms via SMS, is fully user programmable, contains logic, delay, time clocks and counter functions.



Analogue Inputs

  • 4 analogue inputs with 12 bit resolution, expandable up to 8 inputs.
  • Each input can be programmed to be either a 4-20mA input or a 0-2.5V input.
  • Additional input signal processing via add on modules.
  • Each input has a discriminator capable of transforming the analogue value into a digital value. The discriminator can be set to operate as a simple switch or a window. The digital value can be set to be true if the input is above or below the switch threshold or within or outside the window.
  • Hysteresis is used to prevent spurious switching around the thresholds.
  • Programmable delay from 0 to 255 seconds for each input
  • Programmable analogue sampling rate from once per second to one sample every 18 hours.
  • Input averaging. The analogue inputs can be set to record either the average value over the logging period or the instantaneous value when a log is taken.

Digital Inputs

  • None on the base board, expandable up to 4 inputs.
  • Input accepts a switch closure to ground with an external pull up resistor.
  • 32 bit counter associated with each input. The counter counts the positive transitions on an input.
  • Counters can be selectively logged.
  • Counters can be reset at each logging interval or by a signal derived from any digital input, digital variable, analogue input or time clock.
  • Counters are scaled using user defined scale factors and units.
  • Each counter can set a predefined digital variable if the either the input frequency exceeds a user defined value or if the counts exceed a used defined count. Each input has it's own digital variable.
  • Each counter has a second digital variable which will give an early warning of a possible excess frequency or excess count condition.

Digital Outputs

  • 1 open collector MOSFET, expandable up to 6 outputs
  • The switches can handle loads of 100mA with voltages up to 25Volts.
  • Each output can be driven from a signal derived from any digital input, digital variable, analogue input or time clock.

Digital Variables

  • 32 digital variables accept outputs from the internal functions.
  • All digital variables can be used as inputs to any function.


  • 128kbytes of logging memory.
  • Each analogue input can be selectively logged.
  • Each digital counter can be selectively logged.
  • All log entries are time stamped with a resolution of 1 second.
  • All alarms are logged.
  • All re-program events are logged.
  • All changes to the input limits are logged together with the users phone number.
  • Logging intervals selectable from 5 minutes to 1 hour synchronised to cardinal times with optional capability to log at rates from 5 seconds to 255 seconds interval in 1 second steps.
  • Logging rate can be controlled by any digital input, digital variable, analogue input or time clock.
  • Capability to output logged data as a csv style frame each time a logged sample is stored.


  • Baseboard: 37mm x 83mm x 12mm (H x W x L)
  • With expansion: 37mm x 83mm x 20mm
  • -20 to +50 degC. 5 to 95% humidity non-condensing.

Power supply

  • 3.6VDC to 16VDC @ 25uA nominal. Current consumption varies depending on the configuration from 5uA up to about 50uA


  • All electronics and power supplies can be mounted in plastic or metal sealed enclosures to meet environmental requirements.
  • No fans, heat sinks or other heat dissipation methods are required.
  •  Field wiring connections can be provided through plugs, sockets or penetrations in the enclosure meeting expected environmental requirements.
  • Enclosures will be sized to accommodate the equipment to be housed.

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