SI239 - Signal Isolator

Product Diagram

The SI239 converts DC current or volt to DC signals, and features:

  • 2-wire or 3-wire output loop power supplies.
  • Inputs signals up to 2000Vdc and 10Adc.
  • Input option for true rms (not sine wave).
  • 2000Vrms isolation.
  • Designed for single (factory set) input/output combinations.
  • Front adjustments for span and zero.
  • Options include adder/subtractor and min/max select.

Common applications include:

  • Signal conversion for use with PLC’s.
  • Prevention of ground and current loops.
  • Protection from dangerous floating voltages.
  • Filter of common mode noise.



Most drawings are supplied in PDF format. Portable Document Format is used to present documents in a manner independent of application software, hardware, and operating systems.


Lead Time for a Standard Product


Standard products usually have all the features of the premier products and may have a higher price or delivery time, typically 7 days.

Order Processing

BSI134 Additional Information Required

APCS makes and customises products according to a customers order. Upon receipt of the customers order the following information is required before manufacture, allocation or deliver until full details are given, these include;

  1. Identity of purchaser. Company name, ABN (Australian companies), street address and accounts email address.
  2. Required delivery address.
  3. Full part number and calibration detail required to manufacture items.
  4. Total on purchase order to include delivery charges. Orders received with missing information will be entered and marked to indicate missing details and returned to the customer for correction or approval.

Compliance with the above ensures that your items are manufactured and delivered according to the required specifications.

Standard delivery times commence after the order has been approved for processing.