Aplisens APRE-2000 PD Smart Differential Pressure Transmitter

Aplisens APRE-2000 PD Smart Differential Pressure Transmitter

Table of Contents

Aplisens APRE-2000 PD Smart Differential Pressure Transmitter is applicable to the measurement of differential pressure of gases, vapors, and liquids. The active element is a piezoresistance silicon sensor separated from the medium by separating diaphragms and a specially selected type of manometric fluid.

The special design of the active sensing element ensures that it is able to withstand pressure surges and overloads of up to 250, 320, or 413 bars. Electronics in the casing with a degree of protection IP65, IP66.


  • 4…20 mA output signal + HART protocol
  • ATEX Intrinsic safety
  • Static pressure limit up to 413 bar
  • Accuracy 0.1%
  • Gold-plated diaphragms (Au)
  • Wetted parts material 316L/Hastelloy C276


APRE electronic differential pressure transmitters work by converting changes in the resistance of a piezoresistance bridge, which are proportional to the pressure difference being measured, into a standard current signal. The active sensing element is a silicon diaphragm with four (bridge) piezoresistors, separated from the medium by a sealing diaphragm and manometric fluid. The electronic system digitally processes the measurement signal and generates output signals: an analogue: 4÷20 mA signal, and a digital HART communication signal. A transmitter electrical block diagram is presented in Figure 1. On the input circuit, two analogue signals are formed, reflecting the measured pressure and the sensing module temperature. These signals are digitized and imputed to a microprocessor. Using data input during the production process adjusts for thermal errors and carries out linearization. After processing, the digital signal is converted into an analogue 4÷20mA current signal, with a superimposed digital communication signal. For communication with the transmitter via an analog signal line the Aplisens KAP communicator, or a PC computer meeting the requirements given in 10.2.4, is used.
The transmitter’s input point is fitted with a noise filter and elements protecting against excess voltage. The plasma surge arrester is installed in the special Exi version on request. The transmitter then has got, on a rating plate, marking “Version SA”


The transmitter with a P-type process connection is not heavy, so it can be fitted directly onto impulse lines. For fitting in any desired position on aA25 pipe an Aplisens mounting bracket (Fi 25 mounting bracket, see page IV/ 5) is recommended.

The version with C-type process connections can be fitted directly to a 3- or 5-valve manifold. We recommend factory-mounted transmitters with VM-type valve manifolds (see page IV/ 2). A transmitter without a valve manifold can be fitted in any position on a 2″ pipe or on a wall using the C-2″ mounting bracket (see page IV/ 5).

When special process connections are required for the level measurement of media in closed tanks (e.g. in the sugar and chemical industries) the transmitter is fitted with an Aplisens diaphragm seal. Sets of differential pressure transmitters with diaphragm seals are described in detail and presented in the further part of the catalog.

Aplisens APRE-2000 PD Metrological Parameters

  • Accuracy: ≤±0,1% of calibrated range
  • Long-term stability (for the nominal measuring range):
    • ≤ accuracy for 3 years
    • ≤ 2 x accuracy for 5 years
    • HS version: ≤ accuracy for 6 years
    • or ≤ 2 x accuracy for 10 years
  • Thermal error
    • < ±0,08% (FSO) / 10°C
    • max. ±0,3% (FSO) in the whole compensation range
  • Thermal compensation range: -25…80°C
  • Zero shift error for static pressure
    • 0,01% (FSO) / 10 bar for ranges no. 3, 4, 5, 6, 7, 9
    • 0,03% (FSO) / 10 bar for range no. 8
    • 0,06% (FSO) / 10 bar for ranges no. 1, 2
    • 0,01% (FSO) / 10 bar for ranges no. 2, 8 in HS version
    • 0,02% (FSO) / 10 bar for range no. 10
      Zeroing the transmitter in conditions of static pressure can eliminate this error.
  • Response time: 16…230ms (programmable)
  • Additional electronic damping: 0…60 s
  • Error due to supply voltage changes: 0,002% (FSO) / V

Aplisens APRE-2000 PD Electrical Parameters

  • Power supply: 7,5…55 VDC (Ex ia 7,5…30 VDC)
  • Output signal:  4…20 mA + HART
  • Load resistance: R[Ω ]≤ Usup [V] – 7,5V / 0,0225A
  • Resistance required for communication min. 240 W


  • Wetted parts: SS316L, Hastelloy C276
  • Diaphragms: SS316L, Hastelloy C 276, Au
  • Casing: SS304

Operating Conditions

  • Operating temperature range (ambient temp.):
    • -25…85°C
    • Exi a version -25…80°C
  • Medium temperature range -25…120°C
    • over 120°C – measurement with use an impulse line or diaphragm seals
    • up to 100°C – PED version
    • up to 100°C – version for 413bar static pressure
      CAUTION: the medium must not be allowed to freeze in the
      impulse line or close to the process connection of the transmitter


  • M-type connector with M20x1.5 thread – see figure 5a;
  • P-type connector with M20x1.5 thread – see figure 6a;
  • CM30x2-type connector with flush diaphragm – see figure 7a;
  • G1/2 -type connector with G1/2” thread – see figure 8a;
  • GP -type connector with G1/2” thread;
  • CG1-type connector with G1” thread and flush diaphragm;
  • RM–type connector with M20x1.5 thread with radiator;
  • RP – type connector with M20x1.5 thread with hole Φ12 with radiator;
  • G1/4 – type connector with G1/4” thread with hole Φ4;
  • 1/2NPT M type connector with 1/2NPT tread;
  • 1/2NPT F type connector with 1/2NPT tread;
  • R1/2-type connector with R1/2 tread;
  • CG1/2-type connector with G1/2 tread and flush diaphragm;
  • Other connection types by arrangement

Download Datasheet: Aplisens Smart differential pressure transmitter APRE-2000 PD

Reference: aplisens.com

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