Technical information
Field display

RIA 261
Digital loop-powered field display
for 4 to 20 mA current loops

Features and benefits• Loop-powered display, no additional power supply
cable required• 5 digit LC display, 26 mm height• Trend bargraph in 10% steps• Rear illumination without additional power supply• Measurement range displayed from -19999 to 99999• Flexible measurement range set up using three pushbuttons• Certification- ATEX- FM- CSA
• GL Germanischer Lloyd Marine approval• Two cable entries for wiring the measurement circuit• Space for installing additional measurement electronics, e.g. temperature head transmitters• Housing can be lead sealed• Protection class IP66/NEMA 4X• GORE-TEX® membrane for pressure compensation

TI083R/09/en51002768

Application• Plant and machine construction• Field mounted applications• Laboratory fittings• Process display, monitoring• Suitable for Ex application

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Function and system design

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Measuring principle

Example for field display application area

The display measures an analogue measurement signal and indicates this on the display. The display is connected in a 4 to 20 mA current loop and also derives its supply from the loop. The volt drop is almost negligible(< 2.5 V). The dynamic internal resistance (load) makes sure that independently from the loop current, themaximum volt drop is never exceeded. The analogue signal at the input is digitised, analysed and shown in therear illuminated display.
Equipment architecture

Micro-controller controlled field mounted display with illuminated LC display. Setting up measurement range,
decimal point and offset of the display is easily done on an open unit using the three operational push buttons
fitted. Setting up during operation is possible. The rear illuminated display is always active and needs no further
wiring for its energy requirement.

Input
Measured variable

Current

Measuring range

4 to 20 mA (polarity protected)

Electrical specifications• Volt drop (load)< 2.5 V• Max. input current (short circuit current)
200 mA

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OutputOutput signal

The analogue input signal (4 to 20 mA) is not converted. The input signal is digitised, analysed and shown inthe LC display.

Signal on alarm

No measured value seen in the LC display, no rear illumination.

Transmission behaviour

The display allows transmission of the HART® transmission protocol.

Auxiliary energy
Electrical connection
activeG09-RIA261ZZ-04-00-xx-en-001.eps

passive

Field mounted display terminal layout
Terminal

In- and outputs

1

Measurement signal (+) 4 to 20 mA

Signal input

2

Connection terminal for further instrumentation

Terminal

3

Measurement signal (-) 4 to 20 mA

Signal input

4Connection terminal for further instrumentation

Terminal

Supply voltage

The power supply is done using the 4 to 20 mA current loop power.
Volt drop:< 2.5 V

Cable entry

2 x M20 cable entries
Alternative:
2 x ½" NPT cable entries

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RIA261

Performance characteristics
Reference conditions

T = 25 °C

Maximum measured error< 0.1% of scaled analogue range

Non-repeatability

Not specified

Influence of ambient
temperature

Temperature drift = 0.01%/K ambient temperature

Operating conditions
Installation instructions• Installation area: Wall or pipe mounting (see Accessories)• Installation angle: No limitations

Environment
Ambient temperature range−20 to +60 °C (for Ex areas, see Ex certificate)Ambient temperature limits

See ambient temperature range

Storage temperature-25 to +70 °C

Climate class

To IEC 60654-1, Class D1

Degree of protection

IP66, NEMA 4X

Shock resistance

7 Nm housing, 4 Nm glass to IEC 60079-0

Vibration resistanceNot specified

Electromagnetic compatibility

RF protection
To EN 55011 Group 1, Class B
Interference safety• ESD to IEC 61000-4-2, 6 kV/ 8 kV
• Electromagnetic fields to IEC 61000-4-3, 10 V/m• Burst (power supply) to IEC 61000-4-4, 4 kV
• Surge to IEC 61000-4-5, 1 kV
• Cable high frequency to IEC 61000-4-6, 10 V

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Mechanical construction

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Design, dimensions

Unit dimensions in mm
Dimensions for wall mounting holes (lower picture) in mm• There is room available behind the hinged electronics for additional electronics e.g. temperature head transmitter. Take note of manufacturers installation instructions!
Internal dimensions: H = 60 mm, W = 140 mm, D = 30 mm• Housing can be lead sealed• GORE-TEX® membrane used as pressure compensation fitted to the left of the cable entries
WeightApprox. 800 g

MaterialHousing
Die cast aluminium epoxy coated with glass insert
Wall/stand pipe mounting kit and tensioning tape1.4301 stainless steel

Terminals

Endress+Hauser• Plug in screw terminals inside the housing in order enable loop current connection:
Plug on screw terminals, terminal size 1.5 mm² solid core, 1.0 mm² stranded with ferrule• Earth (ground) connection on housing exterior: Terminal range 2.5 mm²5RIA261

Human interface
Display elements• Display
5 digit LC display, 26 mm character height, rear illuminatedBargraph display in 10% steps, markers for over/under range display• Display range-19999 to +99999• Offset-19999 to +32767• Operation
Three push button operation (-/+/E) integrated in the unit, access when unit is opened• Signals
Measurement range over/under value• Rear illumination
Illumination brightness increases with an increase in loop current

Certificates and approvals

4Ex approval

The measurement system fulfils the legal requirements laid out within the EU regulations 89/336/EWG.
Endress+Hauser acknowledges successful testing of the unit by adding the CE mark.
Details regarding the availability of the Ex versions (ATEX, FM, CSA, etc.) can be obtained from your local E+Hsales organisation. All relevant data for Ex protection can be found in separate Ex documentation, which canbe requested separately.

Ordering information
Product structure
Process Display RIA261, Field
Electronic indicator.
Loop powered.
1 channel, presettable scale.
Display LC, 5 digit, char. height 26mm.
Bargraph -10...110%.
Approval: GL (German Lloyd) Marine.
Rear-illuminated display.
Approval:A
Non-hazardous area
B
ATEX II2(1)G EEx ia IIC T6
C FM IS, NI Cl.I / 1,2 Gr.ABCD T6
D CSA Cl.I, Div 1,2 Gr. ABCD T6
E
ATEX II3G EEx nA IIC T6
Housing; Cable entry:1
Alu IP66 NEMA4x; gland M20
2
Alu IP66 NEMA4x; thread NPT 1/2
Additional option:
1
Basic version
2
Mounting bracket, wall / pipe
3
Works calib. certif.
4
Mounting bracket, wall / pipe + WCC=Works calib. certif.
RIA261-6⇐ Order code

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Accessories

Wall and stand pipe mounting kit, pos. B (with tension tape installation, pos. A)
Order number 51003502

Further documentation• Operating manual process display RIA 261 (BA111R/09/)• Ex additional documentation: ATEX (XA007R/09/a3) FM, CSA, etc.
• Brochure "System Components" (FA016K/09/en)

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Subject to modification

International Head Quarter
Endress+Hauser
GmbH+Co. KG
Instruments International
Colmarer Str. 679576 Weil am Rhein
Germany
Tel. +49 76 21 9 75 02
Fax +49 76 21 9 75 34 5
www.endress.com
info@ii.endress.com

TI083R/09/en/05.05
51002768
FM+SGML 6.0