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VEGADIF 85 Differential pressure measurement

A universal differential pressure transmitter for measuring liquids, gases, and vapours is the VEGADIF 85. Level measurement in pressurised vessels and flow measurement in conjunction with efficient pressure transmitters are examples of typical application areas. Monitoring filter pressure as well as density and interface measurements are further applications.

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  • Benefits
  • Function
  • Technical Data
  • Materials
  • Housing versions
  • Electronics versions
  • Supplementary electronics
  • Approvals
  • Adjustment
  • Electrical connection
  • Dimensions
  • Measurement of extremely small differential pressures through high precision measured value detection
  • High reliability through integrated overload system
  • Versatile use through a variety of measuring ranges and process fittings

A metallic measuring cell is used as sensor element. The process pres- sures are transmitted via the separating diaphragms and an oil filling to a piezoresistive sensor element (resistance measuring bridge using semiconductor technology).

The difference between the acting pressures changes the bridge volt- age. This change is measured, further processed and converted into a corresponding output signal.

In addition, the measuring cell temperature and the static pressure are measured on the low pressure side. The measuring signals are further processed and are available as additional output signals.

Measuring ranges

+0.01 … +40 bar/+1 … +4000 kPa

(+0.145 … +580 psig)

Smallest adjustable span

1 mbar/100 Pa (0.015 psig)


< ±0.065 %

Process fitting - basic


¼-18 NPT according to IEC 61518

Process fitting with chemi- cal seals

Flanges from DN 32 or 2", hygienic fittings from DN 32 or 2"

Process temperature -

basic version

-40 … +105 °C (-40 … +225 °F)

Process temperature with

chemical seals

-40 … +400 °C (-40 … +752 °F)

Process pressure

-1 … +400 bar/-100 … +40000 kPa

(-14.5 … +5802 psig)

Ambient, storage and

transport temperature

-40 … +80 °C (-40 … +176 °F)

Operating voltage

11 … 35 V DC

The process flanges are made of stainless steel 316L, Alloy 276 or Su- perduplex. The process diaphragm is available in 316L and in the high resistance materials such as Alloy C276 and Tantalum.

The housings are available as single chamber or double chamber ver- sion in plastic, aluminium or stainless steel.

They are available in protection ratings up to IP68 (25 bar) with external electronics as well as in IP69K.

Apart from the two-wire electronics with 4 … 20 mA or 4 … 20 mA/ HART, also purely digital versions with Profibus PA, Foundation Field- bus and Modbus are available.

For instruments with double chamber housing two supplementary electronics such as radio module, a second current output or a power pack are available.

Worldwide approvals are available for VEGA instruments, e.g. for use in hazardous areas, on ships or in hygienic applications.

The technical data in the respective safety instructions are valid for ap- proved instruments (e.g. with Ex approval). In some cases, these data can differ from the data listed herein.

Adjustment directly at the measuring point

The adjustment of the instrument is carried out via the optional display and adjustment module PLICSCOM or via a PC with the adjustment software PACTware and corresponding DTM.

Wireless adjustment via Bluetooth

The Bluetooth version of display and adjustment module enables a wireless connection to standard adjustment units. This can be smartphones/tablets with iOS or Android operating system or PCs with

PACTware and Bluetooth USB adapter.

Wireless connection to standard operating devices

Adjustment is hence carried out via a free-of-charge app from the Apple App Store or the Google Play Store or the adjustment software PACTware and respective DTM.

Adjustment via remote systems

Further adjustment options are possible via a HART Communicator as well as manufacturer-specific programs such as AMS™ or PDM.

Electronics and connection compartment, single chamber housing

  • Voltage supply/Signal output
  • For display and adjustment module or interface adapter
  • For external display and adjustment unit
  • Ground terminal for connection of the cable screening

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