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  • measuring of differential pressure in gases and liquids

  • easy operation

  • battery power supply

  • low consumption

  • reasonable price

MST - set for measuring differential pressure

Basic technical information

Nominal pressure range10 kPa100 kPa1000 kPa
Measuring pressure range±19,99 kPa±199,9 kPa-100 ÷ +1000 kPa
Overpressure max.50 kPa500 kPa2000 kPa
Errormax. 1%max. 1%max. 1%
Static pressuremax. 1 MPamax. 1 MPamax. 1 MPa
Common mode pressure errormax. 1%max. 1%max. 1%
Ambient temperature range0 ÷ 85°C, transiently 100°C (non condensing)
ProtectionIP 41
Damping time constantcca 5s
Supplybattery 9V
Current consumptionmax. 4mA
Battery lifemin. 50 hours of operation
Outside dimensions of DMU unit145 x 85 x 35 mm
Case outside dimensions270 x 220 x 85 mm
Set weight1,1 kg

EMC – accords to ČSN EN 61326-1
At the customer´s wish it is possible to secure a metrological verification of the transmitters at an accredited Calibration Service Centre.

Instructions for use

  • The instrument is started up by a short pressing of the “ON-OFF” button. In case of insufficient voltage of the battery, the sign “LO BAT” will appear on the display. In such a situation the battery must be changed because it could cause distortion of the measured results. After the battery is changed, always switch on and off the instrument using the “ON-OFF” button. After a short setting of the measuring circuits, it is possible to carry out resetting the data if necessary. We recommend carrying out resetting always when the battery is changed. When zero pressure difference on the inputs is secured, the resetting routine is started up by a short pressing of the “NUL” button. This process lasts for a few seconds and its course is indicated by flashing of all decimal points. Never start up resetting during measuring!
  • If you need to switch on time filtration of the measured signal, you must hold the “NUL” button with the instrument switched off and switch of the instrument by pressing the “ON-OFF” button. The operation of the filter is signalized by a flashing colon between the second and third figure on the display. Cancelling of this function is made by repeated switching off and on of the instrument without holding the “NUL” button.
  • If the DMU-T instrument is equipped with an analogue output, it is necessary to connect it with a data recorder or the converter card of the computer. The input resistance of the follow-up device should be higher than 10 kohm. The output is resistant against permanent short-circuit.
  • Before the gauge is connected to the pressure circuit, it is necessary to check whether the measured medium does not attack the used materials, ie. silicon, duralumin, brass, plastic material polyetherimid and fluorine-silicon sealing. Air, nitrogen, ethyl alcohol, oil, etc. are convenient to this requirement.
  • It is also necessary to secure that the pressure range of the instrument corresponds with the measured pressure. With the differential gauge, the user must secure that the measuring membrane is not one-sidedly overloaded by pressure higher than the permitted maximum overpressure corresponding with the nominal range. That is why the DMU-T gauge with the integrated three-way apparatus is equipped with a ball valve. This valve is opened during manipulation and connecting pressure tubes (the wing parallel to the valve) and thus minimizes the pressure difference. After natlakování and settling, the valve is closed and measuring of necessary pressure differences are made. After the measuring is finished, the valve is opened again and then the tubes are disconnected from the pressure circuit. If this procedure is not observed, it can cause destruction of the measuring sensor!!!
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