Pure Infinity’s VOC measuring device

Simple and quick setup

At Pure Infinity we have FID’s for rent. These are built in a complete case with PLC remote connection by GSM to our servers for data collection. The setup of the FID can be done by a Pure Infinity professional or a staff member of your organization in approximately 30 minutes. Once connected to the electricity, the system will connect with our servers and we can control, monitor and collect the data.

Detailed results

Once setup, the system can run for long periods up to several months. The FID records standard data per 6 seconds – so every minute there are 10 measurements of the concentration of the solvents or VOC’s in the air. The FID measures on 1 mg/Nm3 accurate. This data is combined with a separate sample that is analysed in the lab. This allows us to differentiatie between the different types of VOC’s and know the precise total VOC concentration. Results can be presented as either raw data in .csv or Excel or be shown in a full report with our professional interpretation of the data.

The mechanizations of the Flame Ionisation Detector

A Flame Ionization Detector (FID) consists of a hydrogen (H2)/air flame and a collector plate. The effluent from the GC column passes through the flame, which breaks down organic molecules and produces ions. The ions are collected on a biased electrode and produces an electrical signal. The FID is extremely sensitive with a large dynamic range. Flame ionization detectors are used for detecting hydrocarbons, also called Volatile Organic Compounds (VOC).

The sample to be analyzed is mixed with a special burner fuel, hydrogen (H2). Ions and electrons that were formed in the flame enter the electron gap, decrease the gap resistance and thus permit a current to flow into the external circuit. The current is proportional to the rate of ion formation, which depends on the hydrocarbon concentration in the gases and is detected by a suitable electrometer and displayed on an analogue output.

Easily adjust your measuring sequence

The Pure FID measures 4 sample points simultaneously, in a sequence that can be adjusted for the specific use of the Pure FID. The settings that can be used are xx minutes sampling of sample point 1, then switching over to sample point 2. Wait xx seconds to refresh the sample line for the air from the new sample point, then xx min of measuring sample point 2. It continues in this way. If the air is wet or dusty, the Pure FID automatically purges the sample lines in reverse with a built-in air pump.

“To measure is to know.”

Data collection by REMUS

The Pure Infinity REMUS system automatically collects all the data that is generated by the FID. The data is sent to REMUS via a mobile netwerk, where it is transformed into an easy visual presentation. It also exports data to .csv and Excel files, so it can be used by process engineers. REMUS is built for these specific tasks and runs on the dataservers of Pure Infinity.

Specification for H2 (hydrogen)

Please not that due to the restrictions on transporting compressed gasses, and explosive gasses in particular, the burner fuel (hydrogen) for the FID needs to be organised at a local gas supplier. Companies like Praxair, Linde Gas and Air Liquide are possible suppliers. H2 gas is available in cylindrical bottles under pressure in different sizes.

Specifications:

• Fuel gas: hydrogen (H2) CAS: 1333-74-0
• Purity: N5,0 (99,999% pure H2) is required
• Usage: ~ 1,2 liter per hour
• Connection: DIN 477 type 1. This is a connection W21,8 x 1/14” L (left turning).
• Pressure to FID: to be confirmed by Pure Infinity. Regulator also connected/included to the Pure FID.