The model 4-20 IQ is a microprocessor based intelligent sensor transmitter. It comes equipped with a digital display which provides a local reading of the gas concentration. Operating on 14-24 VDC power, it provides a linear 4-20 mA output proportional to the gas concentration, and is housed in an explosion-proof casing. The 4-20 IQ has been UL Classified and CSA Approved Class I, Div. 1, Groups B, C, and D. The 4-20 IQ can operate as a stand-alone instrument, or it can be used with an IST control unit to provide control room readings and alarm relays.

The 4-20 IQ come equipped with an automated calibration feature which allows the unit to be calibrated without manually adjusting any potentiometers. Just apply gas and the 4-20 IQ will do the rest. It couldn't be easier! Interfacing with the 4-20 IQ is accomplished by using a magnetic wand to activate magnetic switches located on the front panel. Thus, all functions can be performed with removing any covers, meaning there's no need to declassify an area being monitored. The 4-20 IQ can be used with any of IST's sensor technologies: infra-red (IR), solid state, catalytic bead, or electrochemical.