Principle of Operation
System Plus is an environmentally sealed continuously pumped air system built around the Ion Science
TVOC product and can operate as a field portable or fixed operation system utilising different power supply
options to enhance the measurement capabilities of the TVOC Photo Ionisation Detector for measuring VOC
gases.
Gas flow in is connected to the Sample Inlet via a 6mm push fit connector, the integral Mini Pump, working
at a flow rate of 2 litres per minutes, draws the sample from the Sample Inlet, through a Water Trap Filter,
across the TVOC detectors’ sensor and through a Flow Fail Switch, the sampled gas then exits the system
via a VOC Stripping Filter to the Sample Exhaust.
Detected gas will be displayed on the TVOC’s LCD display and a measured output can be obtained via the
TVOC 4/20mA output (see TVOC manual for details). Also, as a safety precaution, any VOC gas passing
through the system will be absorbed into a VOC Stripping Filter before exiting the system via the Sample
Exhaust as clean air.
The System Plus option for TVOC is designed to be mounted in non-intrinsically safe areas only and allow a
gas sample to be drawn from a remote location up to a maximum of 30M away via 6mm PTFE tubing.
Ensure PTFE (or similar) sampling tubing is used so that any VOC’s are not absorbed into the tubing walls.
The 4-20mA analogue output is wired directly from the TVOC instrument to a DIN rail mounted connector for
ease of access for signal integration into a DCS for process control, BMS for warning alarms or used as a
data logging function. The System Plus box has multiple power input options (12V dc, 15V dc, 24V dc,
110/115V ac, 230/240V ac) allowing it to be utilised in both fixed and portable operations. Power input option
should be requested at time of order, standard build is 15V DC if not stated. Two additional cable glands are
provided on the bottom of the System Plus box to enable Power In and Control Out cabling.
PLEASE NOTE:
THIS MANUAL SHOULD BE READ IN CONJUNCTION WITH THE LATEST VERSION OF THE TVOC
INSTRUMENT MANUAL FOR INSTALLATION AND OPERATING PURPOSES:
Quality Assurance
System Plus has been designed in compliance with ISO9001:2008. This ensures that the equipment
supplied to our customers has been assembled reproducibly, and from traceable components.
Disposal
Dispose of the TVOC System+ and its components, in accordance with all local and national safety and
environmental requirements.
Responsibility For Use
The System Plus option for the TVOC instrument allows detection of a large range of Volatile Organic
Compound (VOC) gases which are dangerous from both a toxicological and explosive perspective. Ion
Science Ltd accepts no responsibility for the incorrect adjustment of features that cause harm or damage to
persons or property.
