The DG7 Series Intelligent gas detectors is split over three main options housed in a common unit with interchangeable, intrinsically safe sensor cartridges that can be replaced while powered. The DGI-TT7-E monitors toxic gases or oxygen using electrochemical cells, the DG-TT7-S employs a solid-state metal oxide semiconductor, and the DG-TX7 utilizes dual OXYCOL catalytic sensors. These microprocessor-driven detectors are easily configured via a wireless hand-held terminal (TLU) or a hard-wired HART option, allowing for flexible installation and reduced servicing costs, with relay operation and alarm levels adjustable through the hazardous area approved TLU. Featuring an integral daylight-readable display for local status, the series can directly interface with various control systems and PLCs.
The DG7 Series is a group of intelligent gas detectors employs a wide choice of sensor types.
The DG-TX7 employs a pair of OXYCOL catalytic sensors for flammable gases.
The DG-TT7-S is a solid-state metal oxide semiconductor for Hydrogen Sulphide gas.
The DGI -TT7-E is used for Toxic gases or Oxygen monitoring.
All DGi-TT7 are constructed from a common housing and electronics with the detection properties being determined by the type of sensor (cartridge) used. A wide range of cells are available, these cells are intrinsically safe, and may be replaced with the detector powered which minimises the system down time. The intelligent, microprocessor driven unit is fully configurable using a wireless hand-held terminal (TLU) or by using the hard wired HART option giving true flexibility to the installer and reduced service costs.
Elements such as relay operation and alarm levels are all set via the TLU, a hazardous area approved hand-held unit. The unit may be interfaced directly with a wide range of panels, controllers and PLC’s etc. Its integral daylight readable alphanumeric display indicates local status and alarm level.
The device has been designed for ease of operation and maintenance.
| Intelligent Gas Detector | DG-TX7 | DG-TT7-S | DGi-TT7-E |
| Sensor Type | Oxycol Catalytic Sensor | Solid State MOS | Electrochemical Toxic |
| Gas Detected (Most Common) | Flammable Gases | H2S | O2, H2S, NH3, CO, NO, NO2, H2, SO3, Cl2, HCl, HCN. ACN |
| Signal Output | 4-20mA & HART Protocol | ||
| Power Supply | 18-28vDC | 18-35vDC | 18-30vDC |
| Power Consumption (24vDC) | 2W (Max 5W) | 2W (Max 7.8W) | |
| Dimensions | 117 x 168 x 146 | ||
| Housing Material | 316L Stainless Steel | ||
| Protection Rating | IP66 | ||
| Gas Type | Measuring Range | Life Expectancy | Response Time (T90) | Temp Range |
| DG-TX7 Flammable Gas Detector | ||||
| Flammable Gases | 0 to 100% LEL | Better than 5 Years | 15 Secs (Methane) | -20 to 60°C |
| DG-TT7-S Solid State (MOS) Gas Detector | ||||
| Hydrogen Sulphide (H2S) | 0-20ppm 0-50ppm |
Better than 5 Years | -20 to 65°C | |
| DGi-TT7-E Electrochemical Toxic Gas Detector | ||||
| Oxygen (O2) | 0-5% Vol 0-25% Vol |
12 or 18 Months | <25 Seconds | -10 to 40°C |
| Oxygen (O2) Acid Ambiance | 0-25% Vol | 48 Months | <20 Seconds | +5 to 50°C |
| Hydrogen Sulphide (H2S) | 0-20ppm 0-50ppm 0-100ppm 0-200ppm |
24 Months | <60 Seconds | -20 to 50°C |
| Ammonia (NH3) | 0-50ppm 0-100ppm 0-1,000ppm |
24 Months | <120 Seconds | -20 to 40°C |
| Carbon Monoxide (CO) | 0-100ppm 0-200ppm 0-500ppm 0-1,000ppm |
36 Months | <35 Seconds | -20 to 50°C |
| Nitrogen Monoxide (NO) | 0-100ppm | 36 Months | <20 Seconds | -20 to 50°C |
| Nitrogen Dioxide (NO2) | 0-20ppm | 24 Months | <45 Seconds | -20 to 50°C |
| Hydrogen (H2) | 0-2,000ppm | 24 Months | <70 Seconds | -20 to 50°C |
| Sulphur Dioxide (SO2) | 0-20ppm 0-100ppm |
24 Months | <30 Seconds | -20 to 50°C |
| Chlorine (Cl2) | 0-10ppm 0-20ppm 0-100ppm |
24 Months | <30 Seconds | -20 to 50°C |
| Hydrogen Chloride (HCl) | 0-50ppm 0-100ppm |
24 Months | <150 Seconds | -20 to 50°C |
| Hydrogen Cyanide (HCN) | 0-50ppm | 18 Months | <60 Seconds | -20 to 50°C |
| Acrylonitrile (ACN) | 0-100ppm | 24 Months | <140 Seconds | -10 to 50°C |
The table shows a small selection of the most common gases. A full list is available on request.
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