Simtronics DG-TT7 and DG-RT7 series by Teledyne is part of the DG7 family of gas detectors. All have a common mode of operation for standardised training and maintenance.

The range is split into two categories:

• DG-TT7/S uses a solid-state metal-oxide-semiconductor sensor. For the detection of Hydrogen Sulphide. The DG-RT7/S versions have a Syntel output.
• DG-TT7/K features a thermal conductivity sensor to monitor explosion risks posed by flammable gases or vapours (hydrogen, hydrocarbons, alcohol, etc.). The DG-RT7/K versions have a Syntel output. The principle is very stable and can operate at high gas concentrations. In this configuration, the presence of oxygen is not essential, and catalytic poisoning is not an issue.

Microprocessor-driven, configurable using a wireless hand-held terminal (TLU) or by using a hard-wired HART protocol option, providing installation options and reduced service costs. Relay operation and alarm levels can be set using the TLU, a hazardous-area-approved device.

Common Features

• Easy to use.
• Ultrabright four-digit LED display, shows local status by display colour & alarm level.
• 4-20mA output & 2 x configurable relays.
• Compatible with most controllers and PLCs.
• Power supply 24V DC.
• Housing corrosion-resistant Stainless Steel.
• Ingress Protection IP66.
• Approvals ATEX & IECEx.
• Range previously by Simrad Optronics.

Output Signal Options

• HART Protocol 7th edition (facilitating nonproprietary interface).
• Lonworks (Syntel).
• 0-22mA (User configurable) included with DG-TT7-S.