Global certifications allow use in Zone 0, 1 and 2 or Division 1 or 2 hazardous areas. Crowcon’s intrinsically safe TXgard-IS+ gas detector is fitted with electrochemical sensors which enable it to detect a wide range of toxic gases and oxygen. Gases detected include those commonly found in industrial applications such as carbon monoxide (CO), hydrogen sulphide (H2S), chlorine (Cl2), ammonia (NH3), nitrogen dioxide (NO2), sulphur dioxide (SO2) and oxygen (O2).
Already certified to ATEX* and IECEx** standards, the addition of UL*** certification means the TXgard IS+ can now be used globally, including North America, the Middle East and South East Asia in Zone 0, 1 or 2 or Division 1 or 2 hazardous areas when used with a safety barrier (zener barrier or galvanic isolator) ****.
Typical environments where the Txgard IS+ can be used include plastic, rubber, chemical and semiconductor manufacturing plants, water and sewage treatment plants, steel manufacturing facilities, oil and gas drilling and processing facilities, car parks and tunnels.
Tough and hard-wearing, with IP65 ingress protection, the Txgard-IS+ already has a proven track record in industrial and offshore oil and gas installations worldwide. Simple to operate, it has an intuitive display menu and keypad which enables simple maintenance and which provides comprehensive diagnostic facilities which allow true, one-person non-intrusive calibration.
The detector has configurable display options and configurable fault and inhibit currents. Also, by displaying line voltage, there is no need to access test points inside the unit. In addition, the signal current can be ramped manually to a desired value to simplify commissioning with control panels.
Sensor signals are temperature compensated and the device is compatible with virtually any 4-20mA control system. Unlike some 4-20mA gas detectors featuring LCD displays and keypads, the Txgard IS+ combines its power and signal in just two wires, so only one zener barrier is required.
* ATEX – EU Directive covering equipment for use in potentially explosive environments
** IECEx – a scheme to facilitate international trade in equipment and services for use in explosive areas
*** UL – Underwriters Laboratories Inc. The leading North American product safety certification organization, whose certifications are recognised worldwide
**** A zener barrier is an electrical safety barrier that limits the voltages and currents appearing in the hazardous location when faults occur on a circuit. A galvanic isolator is used in situations where two or more electric circuits must communicate, but their grounds may be at different potentials.