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Oldham Simtronics DG-TX7 Intelligent Flammable Gas Detector

Oldham Simtronics

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The MultiXplo DG-TX7 is an intelligent catalytic sensor based flammable gas detector used to detect a wide range of gases, including hydrogen (H2). The device has been designed for ease of installation, operation and maintenance in testing environments.

The MultiXplo DG-TX7 employs a pair of OXYCOL catalytic sensors in a compensated circuitry in order to provide reliable flammable gas detection in harsh environments, as long as oxygen is present.

The intelligent microprocessor driven unit is fully configurable using a wireless handheld terminal (TLU) or optionally via HART giving true flexibility to the installer. Parameters such as relay operation and alarm levels are all set via the TLU; a hazardous area approved handheld unit. In addition, the sensor element is protected by the onboard electronics to prevent exposure to over-range LEL gas concentrations. This helps reduce on-going maintenance and service costs.

Users can select between 4-20 and 0-22mA depending on system requirements. The unit may be interfaced directly with a wide range of panels, controllers and PLC’s etc.

Device status, including measured gas level is indicated on a colour coded 4 digit LED display.

Oldham Simtronics DG-TT7-S Solid-State (MOS) Gas Detector


  • High visible display
  • On board relays
  • Display color is status dependent

Oldham Simtronics DG-TX7 Intelligent Flammable Gas Detector
Technical data


Technology Low temperature oxidation process, Oxycol
Detects Flammable Gases
Range 0 to 100% LEL
Calibration with calibration gas


Response time T90 < 15 s (Methane)
Zero drift +/- 3% Full scale deflection
Accuracy +/- 5% Full scale deflection
Repeatability +/- 1% Full scale deflection
Sensor life Better than 5 years

Output signal:

Standard 4-20mA, max. load impedance 700M (Std. )
2 x configurable Relays max 1 A / 30V
option HART (R) HART Protocol (7th edition)
option 0-22mA (User configurable)
option Lonworks (Syntel)
Local display 4 digit led display and backlight color status with automatic intensity adjustment


Power supply 24V DC, range (18 – 28V DC)
Power consumption 2W normal, 5W max (backlight at max)
Connection 0.3 mm2 (22 AWG) – 1.5 mm2 (16 AWG)
Shielded cable recommended


Storage -40°C TO +70°C (-40°F TO 1 58°F)
Operation -40°C TO +60°C (-4°F TO 1 40°F)
Option Sunshade, max. temp. 85°C (185°F)
Humidity 99% RH (non-condensing)
Pressure Atmospheric pressure +/- 10%
Ingress IP66
RFI /EMI Complies with EN50270


Material 316L stainless steel
Weight 4 Kg (8Lbs)


ATEX II 2 G Ex d IIC T6 Gb (-40°C to +65°C)
(-40°F to +149°F)
IECEx Ex d IIC T6 Gb
IECEx LCI 11.0060X




TLU600 Infrared remote control unit
AS056-250 shade
AS005 Calibration cup
AS047 Display protection
AS011 -2 Sample flow housing
AS019 Splash guard
CAL-K1 C-xxDF-1 A1 -00 Calibration kit 20ppm H2S

Other products (stainless steel range):

DGi-TT7-E MultiTox, Toxic (EC Cell) Gas Detector
DG-TT7-S MultiTox, Solid-State (MOS) Gas Detector
DG-TV7 MultiFlame, Flame Detector


Product Data Sheet


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