Technical Information

RIA251
Process display
Digital loop powered display for 4...20 mA current loops

Application

Benefits at a glance• Plant and machine construction• Control panels• Laboratory fittings• Process display, monitoring• Suitable for Ex applications• 5 Digit LC display
with 17 mm (0.67 in) character height• Loop powered display,no additional power supply cabling required• Measurement range - 19999 to 99999• Flexible measurement range set up
using 3 push buttons

4â
021

TI063R/09/en
51000857

RIA251

Function and system design
Measuring principle

The display receives an analog signal and shows the corresponding value on the display. The unit is connectedin the 4 ... 20 mA circuit and also receives the required power from this circuit.
The analog signal connected is digitalized, analysed and indicated in the LC display.

Example of an application of the process display unit

Measuring system

2The RIA251 process display is connected directly into the 4 ... 20 mA measurement loop. The power required
is taken from the current loop. The voltage drop of <2 V has no significant influence on the measurement
circuit. Setting up the measurement range, decimal point and offset is easily done using the 3 front mounted
push buttons. Setting up can also take place whilst the unit is operational, which means that later changes canbe easily made.
The unit can be obtained with Ex certification to ATEX II 1 G EEx ia IIC T6, FM, CSA and NEPSI (option).
Therefore special applications where the display is required directly in the hazardous area can now be realized.

Endress+Hauser

RIA251

Input
Measured variable

Current

Measuring range

4...20 mA (polarity protected)

Max. input current

150 mA (short circuit current)

Voltage drop

<2VHART® protocol

The display is suitable for transmitting the HART® protocol.

Power supply
Electrical connection

Both the terminals and the connection values of the display correspond to the Ex requirements.
Connection of an active current source e.g. Transmitter with its own power source and an active current
output.

!

Note!
The display can be placed into the explosion hazardous area if a suitable barrier is used.

Terminal layout of the process display

Voltage supply

From 4...20 mA current loop

Voltage drop<2V

Performance characteristics
Accuracy

Accuracy < 0.1% of FSD

Temperaturdrift< 0.01% / 10 K

Installation
Installation instructions

Endress+Hauser

Mounting location
Panel cutout 48 x 96 mm (1.9 x 3.78 in)
Installation angle
No restrictions.

3

RIA251

Environment
Ambient temperature range-20 to +60 °C (-4 to +140 °F)

Storage temperature-30 to +70 °C (-22 to +158 °F)

Climate class

As per IEC 60654-1, Class B2

Protection degree

Between bezel and panel: NEMA 4x, IP 65
Terminals: NEMA 1, IP 20

Electromagnetic compatibility(EMC)

RF protection
To EN 55011 Group 1, Class A
Interferance safety• ESD:To IEC 61000-4-2, 6/8 kV• Electro magnetic fields:
To IEC 61000-4-3, 10 V/m• Burst (supply):
To IEC 61000-4-4, 2 kV
• Surge:
To IEC 61000-4-5, 1 kV
• Cable high frequency:
To EN 61000-4-6, 10 V

Mechanical construction
Design, dimensions

Dimensions of the RIA251 in mm (inch)

Weight4

approximately 300 g (10.6 oz)

Endress+Hauser

RIA251

Material• Housing front: Die cast aluminium• Housing casing: Galvanized sheet steel• Housing rear panel: Plastic ABS

Electrical connectionPlug on screw terminals (securable), Terminal size 1.5 mm2 (AWG 16) solid, 1.0 mm2 (AWG 17) strands withferrule

Human interface
Display elements• Display
5 digit LC display, 17 mm (0.67 in) character height• Range-19999 to +99999• Offset-19999 to +32767

Operation

3 push button operation (-/+/E)

Certificates and approvals
CE89/336/EWG guidelines

Ex-Zulassung• ATEX II 1 G EEx ia IIC T6
to DIN EN 50014 and DIN EN 50020• FM IS, Class I, Div. 1+2, Group A,B,C,D
to FM 3600 and FM 3610
• CSA IS, Class I, Div. 1+2, Group A,B,C,D
to C22.2 No 157• NEPSI Ex ia IIC T6

Ordering information
Product structure

RIA251

Electronical indicator, Depth: 90 mm.
Loop powered.
1 channel, scalable.
Display LC, 5-digit, Character hight 17 mm.
Approval: CSA GP.

ApprovalA
B
CDF

Non-hazardous area
ATEX II1G EEx ia IIC T6
FM IS, Cl.I, Div.1, Gr. ABCDCSA Ex ia, Cl.I, Div.1, Gr. ABCDNEPSI Ex ia IIC T6Housing
12
RIA251-Endress+Hauser

Panel mounting, 48 x 96 x 90 mm
Panel mounting, 48 x 96 x 90 mm + WCC=Works calibration certificate⇐ Order code5

Documentation• System components - field and panel installation display unit, energy manager, active barrier, processtransmitter and overvoltage protection: FA016K/09• Operating instructions ’Process display RIA251’: BA087R/09• Ex documentation:
ATEX II(1)GD: XA001R/09/a3

Instruments International
Endress+Hauser
Instruments International AG
Kaegenstrasse 24153 Reinach
Switzerland
Tel. +41 61 715 81 00
Fax +41 61 715 25 00
www.endress.com
info@ii.endress.com

TI063R/09/en/10.09
51000857
FM+SGML6.0 ProMoDo