Profile: TQ Environmental Plc specializes in the design, manufacture, installation, commissioning & servicing of fixed gas detection instruments and gas monitoring systems. We provide gas detection instruments & gas monitoring systems for oxygen, toxic, flammable and refrigerant gases. The 4200 system is a refrigerant gas leak detection system. With reliable detection levels down to 10 ppm, leaks can be detected quickly. In addition to complying with F-Gas regulations governing larger installations the TQ 4200 can save money both in reduced leaks and improved efficiency. Available in 8, 16 or 24 point versions and with many HCFC and HFC gasses pre programmed into the system. The 4200 system is ideal for both new installations and R22 upgrades, where no recalibration is necessary. For installations where more then one Freon is used in separate packs, the 4200 can monitor separate Freon, pack combinations with a single unit.