+31 313 47 19 98 |
+31 313 47 19 98 |

ISC 230B

ISC 230B intrinsically safe mains power supply and signal interface

The ISC 230B is designed for set-up with UNIGAS 300. It combines the functionalities of intrinsically safe circuits for pulses & serial communication, as well as explosion safe external power supply for the UNIGAS 300. The ISC 230B is operated by 230 VAC but can be supplied by 12 VAC or 12 – 15 VDC as well. Because of this, the ISC 230B is ready for use with a solar system.

4 – 20 mA module

The 4 – 20 mA module converts measurement data from a UNIGAS 300 or a pulse signal originating from a gas meter to an analogue 4 – 20 mA signal. The module is equipped with two analogue 4-20 mA outputs and two digital electronic relay outputs. A standard application may consist of a gas meter where an LF output of the gas meter is connected to a UNIGAS 300 for billing purposes and where the HF pulse output of the gas meter is connected to a ISC 230B with 4 – 20 mA module for controlling an industrial process with a 4 – 20 mA signal.

Pulse-out module

The Pulse-out module is equipped with 4 configurable and galvanically separated pulse outputs with electronic relays. The pulse outputs can switch both DC voltage and AC voltage. A jumper field on the module allows several pulse outputs to be set in parallel. This allows the same pulse to be fed galvanically separated to multiple systems.

RS232 module

The RS232 module provides the ISC230B with an RS232 port. This allows the UNIGAS 300 to be read over RS232.

G485B module

The G485B module provides the ISC230B with a two-wire RS-485 bus connection. This allows the UNIGAS 300 to be read over RS485. Using an RS-485 bus, it is possible to connect multiple meter setups or meters. The bus can be built entirely with Wigersma & Sikkema equipment, but also with third-party equipment.

Ethernet module

The Ethernet module provides the ISC230B with an Ethernet port for RJ-45 connector allowing the UNIGAS 300 to be read over a local IP connection. The Moxa microcontroller is set up plug and play for direct readout of the UNIGAS 300, and the IP address can be easily accessed using the Moxa Web console.

PSTN module

The PSTN module provides the ISC230B with an RJ-11 port for RJ-45 connector allowing the UNIGAS 300 to be read over a fixed telephone line. The microcontroller takes care of all settings in the modem section.

Alarm Puls Extension module

The Alarm Pulse Extension module is specially designed to extend the pulses coming from the alarm outputs of UNIGAS 300 to the end of a clock hour. In addition, the module can also forward an externally offered pulse via the DIP switches.




  • Easy to install and ready for wall mounting
  • Protection class IP65, may be placed outdoors
  • ATEX approved, installation outside the EX-area
  • EX earthing is not necessary due to intrinsic safe circuits
  • Intrinsically safe circuits which enables connection to devices in the EX-area
  • Power supply 230 VAC or 12 VAC or 12 – 15 VDC
  • One serial port for connection to UNIGAS
  • Power supply for UNIGAS 300
  • 3 connectors for modules; pulse out (2 x 2) pulses, RS485, RS232
  • Standard supplied with a local bus for maximum 4 x ISC 230B and 1 UNILOG 300 mains operated, maximum distance 50m

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