Endress+Hauser RMA42 Specifications

TI00150R/09/EN/05.16
71315973

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Technical Information

RMA42

Process transmitter with control unit

Digital process transmitter for monitoring and
visualizing analog measured values

Application

• Plant and apparatus engineering and construction

• Control rooms and cabinets

• Laboratories

• Process recording and supervision

• Process control

• Signal adjustment and signal conversion

• WHG compliant limit signal transmitter

Your benefits

• 5-digit, 7-segment backlit LC display

• User-configurable dot matrix display range for bar graph, units and tag name

• 1 or 2 universal inputs

• 2 relays (optional)

• Min./max. value saved

• 1 or 2 calculated values

• One linearization table with 32 points for each calculated value

• 1 or 2 analog outputs

• Digital status output (open collector)

• Operation using 3 keys

• Configuration via interface and FieldCare or DeviceCare software

Measuring principle

Analog in 1

Analog in 2

RMA42

Function and system design

A0011762

 1 Example for "differential pressure" application

Measuring system

Mathematics functions

The RMA42 process transmitter powers the transmitter and processes analog signals from
transmitters, particularly from the area of process instrumentation. 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.

The RMA42 is a process transmitter, which is controlled by a microcontroller, and exhibits a display,
analog inputs for process and status signals, analog and digital outputs, as well as an interface for
configuration.

Connected sensors (e.g. temperature, pressure) can be powered by the integrated transmitter power
supply system. The signals to be measured are converted from analog to digital signals, processed
digitally in the device, and then converted from digital to analog signals and made available to the
various outputs. All measured values, and values calculated in any way, are available as a signal
source for the display, all outputs, relays and the interface. It is possible to make multiple use of the
signals and results (e.g. a signal source as an analog output signal and limit value for a relay).

The following mathematics functions are available in RMA42:

• Sum

• Difference

• Multiplication

• Mean

• Linearization

Linearization function

Up to 32 user-definable points are available in the device per calculated value to linearize the input,
e.g. for tank linearization. In the case of the two-channel device (option), mathematics channel M2
can be used to linearize mathematics channel M1.

Linearization is also available in the FieldCare configuration software.

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RMA42

Input

Measured variable

Measuring ranges

Current, voltage, resistance, resistance thermometer, thermocouples

Current:

• 0/4 to 20 mA +10% overrange

• Short-circuit current: max. 150 mA

• Load: 10 Ω
Voltage:

• 0 to 10 V, 2 to 10 V, 0 to 5 V, 0 to 1 V, 1 to 5 V, ±1 V, ±10 V, ±30 V, ±100 mV

• Max. permitted input voltage:
Voltage ≥ 1 V: ±35 V
Voltage < 1 V: ±12 V

• Input impedance: > 1 000 kΩ

Resistance:
30 to 3 000 Ω

Resistance thermometer:

• Pt100 as per IEC60751, GOST, JIS1604

• Pt500 and Pt1000 as per IEC60751

• Cu100, Cu50, Pt50, Pt46, Cu53 as per GOST

• Ni100, Ni1000 as per DIN 43760

Thermocouple types:

• Typ J, K, T, N, B, S, R as per IEC60584

• Typ U as per DIN 43710

• Typ L as per DIN 43710, GOST

• Typ C, D as per ASTM E998

Number of inputs

Update time

Galvanic isolation

One or two universal inputs

200 ms

Towards all other circuits

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Output

RMA42

Output signal

Loop power supply

Switching output

One or two analog outputs, galvanically isolated

Current/voltage output

Current output:

• 0/4 to 20 mA

• Overrange up to 22 mA
Voltage:

• 0 to 10 V, 2 to 10 V, 0 to 5 V, 1 to 5 V

• Overrange: up to 11 V, short-circuit proof, I

< 25 mA

max

HART®

HART® signals are not affected

• Open-circuit voltage: 24 VDC (+15% /-5%)
Ex version: > 14 V at 22 mA
Non-hazardous operation: > 16 V at 22 mA

• Maximum 30 mA short-circuit-proof and overload-proof

• Galvanically isolated from system and outputs

Open Collector for monitoring of the device state and alarm notification. The OC output is closed in
normal state. In error state, the OC output is opened.

• I

= 200 mA

max

• U

= 28 V

max

• U

= 2 V at 200 mA

on/max

Galvanic isolation towards all other circuits; test voltage 500 V

Relay output

Relay output for limit function

Relay contact Changeover

Maximum contact burden DC 30 V / 3 A (permanent state, without destruction of the input)

Maximum contact burden AC 250 V / 3 A (permanent state, without destruction of the input)

Minimum contact load 500 mW (12 V/10 mA)

Galvanic isolation towards all other circuits Test voltage 1 500 V

Switching cycles > 1 million

AC

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