4 в 0 2 1
Technical Information
RIA251
Process display
Digital loop powered display for 4...20 mA current loops
Application
Benefits at a glance
•
•
•
•
•
• 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
Plant and machine construction
Control panels
Laboratory fittings
Process display, monitoring
Suitable for Ex applications
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 connected
in 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
2
The 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 can
be 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
<2V
HART® 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)
Weight
4
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 connection
Plug on screw terminals (securable), Terminal size 1.5 mm2 (AWG 16) solid, 1.0 mm2 (AWG 17) strands with
ferrule
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
CE
89/336/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.
Approval
A
B
C
D
F
Non-hazardous area
ATEX II1G EEx ia IIC T6
FM IS, Cl.I, Div.1, Gr. ABCD
CSA Ex ia, Cl.I, Div.1, Gr. ABCD
NEPSI Ex ia IIC T6
Housing
1
2
RIA251-
Endress+Hauser
Panel mounting, 48 x 96 x 90 mm
Panel mounting, 48 x 96 x 90 mm + WCC=Works calibration certificate
⇐ Order code
5
Documentation
• System components - field and panel installation display unit, energy manager, active barrier, process
transmitter 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 2
4153 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
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