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IOSI-02 signal converter

Similar to its succesful predecessor the IOSI-01, the IOSI-02 is a DIN-rail mounted programmable converter for the sensor’s thermocouple mV-signal and oxygen cell mV-signal  (EMF). The IOSI-02 converts these raw sensor mV-signals to calculation results such as temperature, log pO2 and oxygen concentration.

The IOSI-02 has three linear analog 4-20mA output channels, one linear analog 4-20mA input channel and one RS485 serial interface (Modbus ASCII or RTU protocol) for easy integration in the plant’s datalogging system.

The IOSI-02 converter comes with an MSI package for installing two PC applications. The IOSI02config app that connects with the device over USB and which is specifically designed for IOSI-02 configuration, and the IOSI02modbus app specifically designed for long distance logging and  iron-ratio calibration (only for glass melt redox sensor) over the RS485 bus.

 

Standard IOSI-02 calculation settings for the various types of Read-Ox sensors can be found here:

 

The Read-Ox IOSI-02 signal converter has following features:

  • High impedance Oxygen cell EMF measurement (>1 GOhm)
  • Temperature measurement with support for B, E, J, K, R, S and T type thermocouples and with automatic cold junction compensation
  • One 4-20mA fully insulated analog input
  • Three independent 4..20mA analog outputs, 12..30V loop powered galvanically isolated from each other and from the inputs and power supply
  • Input circuitry is electrically insulated from both the digital interfaces, power supply and analog outputs
  • Fully programmable calculations and 4-20mA output ranges
  • RS485 interface with Modbus ASCII or RTU communication protocol
  • PC software IOSI02config for device configuration, for displaying and recording of real time values via driverless USB connection
  • PC software IOSI02modbus for long distance PC communication (max. 1200m) for displaying and recording of real time values via RS485 Modbus protocol
  • DIN rail mountable casing, plug-in terminal blocks
  • Can be powered by the USB interface
  • Inter-IOSI power supply through DIN-rail connector
  • Inter-IOSI master/slave communication through DIN-rail connector in case more analog outputs, analog inputs or RS485 Modbus interfaces are needed per sensor or when measuring results from more than one sensor are used for a certain calculation result
  • Onboard in-situ sensor impedance test to monitor sensor condition over time

IOSI02CONFIG

The IOSI-02 can be connected to a PC via the USB port (driverless USB communication) on its front panel and can be configured using  the specially developed PC application IOSI02config. Standard calculations and 4-20 mA output ranges can be chosen for each particular type of sensor supplied by Read-Ox. Moreover, the end user may also configure the IOSI calculations and 4-20 mA output ranges according his own specific needs. Additionally,  real time measuring values can be (graphically) displayed and recorded using IOSI02config.

 

 

 

IOSI02modbus

The IOSI02modbus PC application has been specially developed for long distance data logging (max. distance 1200 m) through the IOSI-02 RS485 serial interface. Long distance communication is often required as the IOSI-02 is usually installed in a (cooled) DIN rail enclosure cabinet near the furnace and a PC is located in the control room further away from the furnace. Especially for the glass melt redox sensor, IOSI02modbus features on-line iron-ratio of the glass melt and Time Delayed Calibration (so-called TDC)

 

 

Sensor impedance test

The IOSI-02 has an on board sensor impedance test. The internal resistance or impedance of the sensor is an indication of its condition: a high sensor impedance may indicate it is near its end of life and should be replaced soon.

In the data logging window of the IOSI02config PC application, an impedance check can be performed and after the test the probe's impedance is automatically displayed.