General Monitors

TS4000H intelligent hydrogen gas detector
The TS4000H intelligent hydrogen gas detector provides reliable continuous monitoring and accurately detects hydrogen at 0–500 ppm levels. It features a precision electrochemical hydrogen sensor that has a T90 response of under 30 seconds and experiences minimal zero shift across its operating conditions. In addition, it is unaffected by short-term (= 2.5 min) exposure to hydrogen concentrations up to 50% of the lower explosive limit (LEL). The detector has many advanced functions, including 4–20-mA output, 8-amp relays, HART or Modbus communications, and a 3-digit LED screen that displays gas concentrations in ppm. The system also displays fault codes for troubleshooting and provides complete status information to the facility’s control room. The sensor may be mounted remotely, up to 2,000 ft away from the electronics. The detector complies with ATEX, CSA, CE, and GOST standards, and is certified for use in SIL 2 environments. In addition to monitoring for low hydrogen levels, the TS4000H can be configured to detect a variety of other toxic gases, including ammonia, carbon monoxide, chlorine, chlorine dioxide, hydrogen chloride, hydrogen sulfide, nitric oxide, nitrogen dioxide, oxygen deficiency, ozone, and sulfur dioxide.

IR5500 Open Path Gas Detector
The IR5500 Open Path Gas Detector provides continuous monitoring of combustible gas concentrations that pose a significant danger at petrochemical, electric utility, wastewater treatment, and other types of plants. It is reported to be the first open-path detector to meet International Society of Automation (ISA) performance requirements on both the lower explosive limit (LEL) and parts-per-million (ppm) scales, the first with a split-range scale for ppm and LEL monitoring, and the first to be certified for operation at –55°C. In addition, it is among the first major open-path detectors certified to FM Approvals, EN, and IECEx performance standards. Consisting of an infrared source and receiver, the system continuously monitors for methane in the 0–5,000 ppm and 0–5% LEL ranges, as well as for propane in the 0–2,000 ppm and 0–1% LEL ranges. The IR5500 provides two 4–20-mA analog signals proportional to each of the above ranges, in addition to a digital display and relay contacts. The advanced IR sensor has a single-beam detection design, which improves accuracy and reduces drift, and includes continuous self-check monitoring for fail-to-safe operation. Automatic gain control compensates for dirty optics, rain, and fog. Unlike most open-path detectors, the IR5500 features a built-in display, which simplifies installation and maintenance while reducing the total cost of ownership. Sensor data and status information from the IR5500 can be transmitted up to 9,000 ft to any industrial analog-to-digital (A/D) converter for use in multipoint computer-based monitoring. Event logging is provided for faults, maintenance, warning, and alarm events. The IR5500 is available with HART and Modbus, providing complete status and control capability in the control room.

Gassonic Observer ultrasonic gas detector
Gas compressor stations face a high risk of fire and explosion due to a combination of intense heat, pressure and vibration, which can produce cracks in seals and flanges. The Gassonic Observer ultrasonic gas detector monitors fugitive gas leaks in compressor stations. The non-concentration-based gas detector responds to the airborne ultrasound generated from gas releases in open, well-ventilated areas. The device responds to the source of a gas release (rather than the dispersed gas) using robust microphone technology, so it is unaffected by changing wind direction, gas dilution, or the direction of the gas leak. It provides a detection radius of up to 20 m at a leak rate of 0.1 kg/s. The integral Senssonic acoustic self-test periodically verifies the integrity of the electronic circuitry and the operation of the acoustic sensor. Setting the alarm trigger level above the ultrasonic background noise ensures immunity to other noise sources, providing reliable detection.

TS4000 toxic-gas monitoring system
The TS4000 toxic-gas monitoring system guards against exposure to hazardous industrial gases and oxygen deficiency. It has been certified as meeting Safety Integrity Level 2 (SIL2) requirements and can be used in applications that require this standard of reliability, including those in the chemical, food-processing, oil and gas, and pulp and paper industries. Inside an explosionproof housing, the system uses a highly intelligent microprocessor-based design with reliable and rugged electrochemical sensors. Its intrinsically safe interface module supports sensor replacement in the field without the need for special tools or hot work permits. For long-distance applications, it can be mounted remotely up to 2,000 ft away. Other features include dual redundant MODBUS communications, 8-A relays, three-digit display, 4–20-mA output, and indication of remaining sensor life. The TS4000 displays gas concentrations up to 500 ppm, fault codes for troubleshooting, and provides complete status information to the control room.

HazardWatch Integrated Fire and Gas Detection System
A modular system that combines a programmable logic controller (PLC) platform with advanced gas and flame field devices, the HazardWatch Integrated Fire and Gas Detection System is scalable to 13 local gas and fire alarm panels operating over a network up to 25 km in length. The controller, hardware configuration and software have been tested and certified by Factory Mutual (FM) to verify NFPA 72 compliance, including certification for central station monitoring as both a fire alarm panel and a gas controller, for fault-tolerant digital communications, and as a releasing control panel. The optional HazardNet dual-media (coaxial or fiber optic cable), fault-tolerant communications network supports communication between the local gas and flame panels and optional HazardWatch central station with a HazardView workstation that is AC-powered with uninteruptible power supply (UPS) back-up.