Smart Differential Pressure Transmitter GET A QUOTE


  • 4…20 mA output signal + HART protocol (special version: 0…20 mA or 0…5 mA output signal + HART protocol)
  • Display with backlight
  • SIL 2 certificate
  • Intrinsic safety certificate (ATEX, IECEx)
  • Explosion proof certificate (ATEX, IECEx)
  • PED Conformity (97/23/EC)
  • Programmable zero range, shift, characteristics and damping ratio with local panel keys
  • Static pressure limit up to 700bar
  • Accuracy 0,075% (0,05% on request)
  • Marine certificate – DNV, BV
  • Gold plated diaphragms
  • Wetted parts material 316L/Hastelloy C276

Application and Construction

The MICRO APR transmitter is applicable to the measurement of differential pressure of gases, vapours and liquids. The active element is a piezoresistant 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 250/320/413/700bar. The casing is made of aluminum alloy cast or 316SS stainless steel, degree of protection IP66/IP67. The design of the casing enables the use of a local display, rotation of the display, rotation of the casing by 0-340° relative to the sensor, and a choice of cable direction.

Communication and Configuration

The communication standard for data interchange with the transmitter is the Hart protocol.

Communication with the transmitter is carried out with:

  • a KAP-03, KAP-03Ex communicator
  • some other Hart type communicators(*)
  • a PC using an HART/USB converter and Report 2 configuration software.

The data interchange with the transmitter enables users to:

  • identify the transmitter
  • configure the output parameters:
    • measurement units and the values of the start points and end points at the measuring range
    • damping time constant
    • conversion characteristic (inversion, user’s non-linear characteristic)
    • read the currently measured pressure value of the output current and the percentage output control level
    • force an output current with a set value
    • calibrate the transmitter in relation to a model pressurea


The transmitter with P or PN type process connection is not heavy, so can be installed without additional mounting bracket on application. For fitting in any desired position we recommend an universal Micromod mounting bracket for 2” pipe. 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 manifold. 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. When the special process connection are required for the measurement of specific media levels in closed tanks (e.g. in the sugar and chemical industries) the transmitter is fitted with an Micromod diaphragm seal. Sets of differential pressure transmitters with diaphragm seals are described in detail in the further part of the catalogue.

Measuring Ranges
Technical Data

Metrological Parameters


≤ ±0,075% of the calibrated range

(≤ ±0,1% for range no. 10)

Special version: ≤ ±0,05% of the calibrated range

Long-Term Stability

(for the nominal measuring range)

≤ accuracy for 3 years

or ≤ 2 x accuracy for 5 years

HS version: ≤ accuracy for 6 years

or ≤ 2 x accuracy for 10 years

Thermal Error

< ±0,05% (FSO) / 10°C for ranges no. 1 – 9

< ±0,08% (FSO) / 10°C for ranges no. 10

max. ±0.25% (FSO) in the whole compensation range

spec. version for ranges no. 1-9:

< ±0,03% (FSO) / 10°C

max. ±0.1% (FSO) in the whole compensation range

Thermal Compensation Range


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…480ms (programmable)

Exd version: 150ms

Additional Electronic Damping

0…60 s

Error Due To Supply Voltage Changes

0,002% (FSO) / V

Accuracy Depending On The Set Range

Electrical Parameters

Power Supply

10…55 VDC / Exia: 10,5…30 VDC / Exd: 10,5…45 VDC

SIL2: 15…45 VDC / SIL2 Exia: 16…28 VDC

Output Signal

4…20 mA + HART

Load Resistance (for standard version)

Resistance Required for Communication

min. 240 Ω


Wetted Parts

SS316L, Hastelloy C276


SS316L, Hastelloy C 276, Au



Option: SS316

Material of window: polycarbonate glass, hardened glass

Operating Conditions

Operating Temperature Range (ambient temp.)


special version -40…85° C

Exia version -25…80° C

Exd version -25…75° 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

up to 80° C – version for 700bar static pressure

CAUTION: the medium must not be allowed to freeze in the impulse line or close to the process connection of the transmitter

Ordering Procedure
  • Quote