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Intrinsically safe portable density meters: DMA™ 35 Ex and Ex Petrol

The intrinsically safe DMA™ 35 Ex and Ex Petrol portable density meters measure the density and concentration of your sample directly out of the sample container. With ATEX protection according to class II 2 G Ex ib IIC T4 the instruments are ready for safe operation in hazardous environments. The DMA™ 35 Ex version is designed for concentration measurement of flammable or explosive chemicals whereas DMA™ 35 Ex Petrol is the solution for measurement of petroleum samples. Their robust and lightweight design enables long-term on-site operation even in harsh working environments.

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Key Features



  • Rugged, leakproof housing design for industrial and field applications
  • Proven resistance of wetted parts to all common samples
  • Intrinsically safe instruments (Ex marking [Ex] II 2 G Ex ib IIC T4) for use in hazardous areas
  • DMA™ 35 Ex Petrol is equipped with a special housing which provides excellent resistance to petroleum samples


  • Easy operation
  • Compact, lightweight design enabling one-hand measurement
  • No-hassle measurement of hard-to-reach samples
  • Large LC display with backlight
  • Measuring cell with inspection window and backlight
Wireless communication

Wireless communication

  • IrDA interface for data exchange with a PC and data export to a printer
  • RFID interface for changing measurement settings quickly by reading RFID tags


  • Storage of up to 100 sample IDs for easy sample identification
  • Storage of up to 20 measuring methods
  • Storage of up to 1024 measurement results including time stamp and sample ID
  • Two exchangeable batteries ensure long-term, reliable service
  • Integrated conversion tables for simple concentration measurement on acids
  • Preinstalled API tables for product groups A, B, and D (crude oils, fuels, and lubricants)
  • Additional custom-specific measuring units programmable

Technical Specifications

DMA™ 35 Version DMA™ 35 Ex DMA™ 35 Ex Petrol
Measuring range Density: 0 g/cm³ to 3 g/cm³
Temperature: 00 °C to 40 °C (32 °F to 104 °F)*
Viscosity: 0 mPa*s to 1000 mPa*s
Accuracy Density: 0.001 g/cm? **
Temperature: 0.2 °C (0.4 °F)
Repeatability, s.d. Density: 0.0005 g/cm³
Temperature: 0.1 °C (0.2 °F)
Ambient temperature -10 °C to + 50 °C (14 °F to 122 °F)***
Supported measuring units
  • Specific gravity
  • Alcohol tables
  • Sugar/extract tables
  • API functions
  • H₂SO tables
  • Ten programmable custom functions (e.g. HO, HCl, CHO)
Sample volume 2 mL
Dimensions (L x W x H) 140 mm x 138 mm x 27 mm (5.5 in x 5.4 in x 1.0 in)
Data memory 1024 measured results
Power supply Two 1.5 V alkaline batteries
Weight 351 g (12.4 ounces) 396 g (14 ounces)
Interfaces IrDA OBEX/LPT, RFID
Intrinsically safe [Ex] II 2 G Ex ib IIC T4
  • Chemical Industry
  • Electronics
  • Petroleum Industry

* Filling at higher temperatures possible
**Viscosity < 100 mPa*s, density < 2 g/cm³
*** Sample must not freeze within the measuring cell



ASTM D7777


Energy Institute IP 559


ISO 15212-1

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