Process signals transmitter

Universal process transmitter with control unit


from € 206.-
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    • 1 or 2 universal inputs, optional intrinsically safe

    • Backlit 5-digit LCD

    • 2 limit value relays with additional status output

    Specs at a glance

    Inputs 1/2 universal inputs measuring current, voltage, resistance, temperature, optional intrinsically safe
    Functionalities Linearization, mathematical calculations, differential pressure package
    Outputs 2 relays, 1/2 analog outputs
    Dimensions 45 × 115 × 118 mm (1.77" × 4.53" × 4.66")

    LCD - 2 lines;


    toggle function between channels

    Product / VersionPrice / pcs. in EUROrder code
    ApprovalInput; Output1 to 34 to 1011+
    Non-hazardous area1x universal; 1x analog251,-226,-206,- RMA42-AAA
    2x universal; 2x analog341,-307,-279,- RMA42-AAB
    1x universal; 1x analog + 2 relay304,-274,-250,- RMA42-AAC
    2x universal; 2x analog + 2 relay394,-354,-323,- RMA42-AAD
    ATEX II(1)GD [Ex ia] IIC1x universal; 1x analog296,-266,-243,- RMA42-BHA
    2x universal; 2x analog386,-348,-317,- RMA42-BHB
    1x universal; 1x analog + 2 relay350,-315,-287,- RMA42-BHC
    2x universal; 2x analog + 2 relay439,-395,-360,- RMA42-BHD


    Product / VersionPrice / pcs. in EUROrder code
    Configuration kit TXU10- for PC-programmable devices. set-up programme+interface cable for PC with USB-Port. 4 pin plug101,72 TXU10-AC
    Housing Field, R4 182x180x165, 5xM20, PC Protection housing Minitec. Synthetic housing with transparent cover. Protection IP66. 4x22.5mm / 2x45mm. Usage: FTL825.74,96 52010132

    Prices valid until 31.12.2020 in EUR per unit (not including shipping and applicable sales tax). See
    Endress+Hauser Terms and Conditions

  • Application

    Due to its universal design the RMA42 process transmitter is suitable for many industries such as chemical, water and waste water and food and beverages. Typical applications include monitoring of signals for any violation of preset limit values (also to WHG) as well as transmission of signals from hazardous areas, differential pressure applications and signal multiplying. RMA42 can be installed in a switch cabinet or used in a field housing.


    The RMA42 process transmitter powers the transmitter or sensor and processes the analog signals from those. These signals are monitored, evaluated, calculated, saved, separated, linked, converted and displayed. The signals, intermediate values and the results of calculations and analysis are transmitted by digital or analog means. With the two relays the process can be controlled.

  • Technical data

    Input parameters

    1/2 × universal input 0 to 20 mA, 4 to 20 mA;

    Over range: up to 22 mA, 0 to 10 V, 2 to 10 V, 0 to 5 V, 1 to 5 V, ±1 V, ±10 V, ±30 V, ±100 mV, 30 to 3000 Ω;

    Pt 100 according to IEC60751, GOST, JIS1604, Pt 500 and Pt 1000 according to IEC60751;

    Cu 100, Cu 50, Pt 50, Pt 46, Cu 53 according to GOST;

    Ni 100, Ni 1000 according to DIN43760;

    Type J, K, T, N, B, S, R according to IEC60584;

    Type U according to DIN43710;

    Type L according to DIN43710, GOST;

    Type C, D according to ASTM E998

    Linearization 2 Linearization tables of input values (up to 32 linearization points supported)
    Output parameters
    Analog output

    1/2 x analog output, 0 to 20 mA, 4 to 20 mA; 0 to 10 V, 2 to 10 V, 0 to 5 V;

    short-circuit proof, Imax < 25 mA

    Loop power supply 24 V DC (+15 % / –5 %), max. 30 mA; short-circuit proof and overload proof; galvanically isolated from system and outputs
    Status Output Open Collector to monitor device status as well as cable open circuit
    Relay 2 changers with function modes: min, max, gradient, alarm, out-band, in-band
    Limit function Max. contact burden DC 30 V / 3 A
    (permanent state, without destruction of the input)
    Max. contact burden AC 250 V / 3 A
    (permanent state, without destruction of the input)
    Min. contact load 500 mW (12 V/10 mA)
    Operating conditions
    Protection Class DIN rail housing IP20
    Ambient temperature –20 to +50 °C (–4 to 122 °F)
    Storage temperature –40 to +85 °C (–40 to 185 °F)
    Power supply
    Wide range power supply 24 V to 230 V AC/DC (–20 % / +10 %) 50/60 Hz
    Structural design
    Housing (W × H × D) 45 × 115 × 118 mm (1.77" × 4.53" × 4.66")
    Electrical Connection Pluggable screw clamps, 2,5 mm²
    Display and user interface

    LCD 2-lines;


    toggle function;

    1st line: 7 segment, 5-digit;

    2nd line: Dot-Matrix free programmable for Bargraph, TAG, unit


    2 × Device status;

    2 × Relay status

    Operation using three buttons and/or via configuration software FieldCare Device Setup
    Ex-Approvals ATEX II(1)GD [Ex ia] IIC
    Others SIL2, UL, GL, CSA GP
    Software functionalities
    Min/Max log function / memory, alarm logging, differential pressure application package, 2 calculation channels: sum, difference, average, linearization
    Configuration software FieldCare Device Setup
    Commubox TXU10 (including FieldCare Device Setup)

    Dimensions (in mm)

    Dimensions of a process transmitter RM42

    Installation according to instruction manual

    Electrical connection

    Electrical connection of a RMA42 process transmitter

    a) Input

    b) Output

    c) Analog Out

    d) OC

    e) Relay

  • More documents for RMA42
  • Application Example: Differential pressure measurement

    Analog process transmitter RMA42

    Differential pressure measurements are no more complicated or expensive than an RMA42 process transmitter coupled with a pair of Cerabar pressure sensors. The signals from the pressure sensors are transmitted to the RMA42.

    Inside the RMA42, the set analog input parameters  are used to automatically calculate the difference between both pressures, hence the filling level value. The linearization of the level value then in turn allows calculating the volume. As a result, the level and the volume can be shown on the display and the values can be transmitted to other systems using the analog outputs of the device.
    In addition, the RMA42 process transmitter possesses an integrated loop power supply and manages the sensors' power supply.

    The same instruments combination is perfectly fit either to control the condition of a filter and to monitor a pump.


    Note that the RIA45 display for panel mounting and the the RIA46 display in field housing can be used like the RMA42.


    a) Level

    b) Head pressure