The RIA251 is a digital loop-powered process display that monitors 4-20 mA measurement signals with high accuracy and resolution, displaying readings on a 5-digit LCD. It has IP65 protection, operates from -20 to 60°C, and connects directly to measurement circuits requiring a voltage drop of less than 2V. Prices range from $233-309 depending on approvals and quantity.

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Technical Datasheet
TD 00012E/24/EN/01.13
• 3-key operation
• Highly legible five-digit LC-display
• For connection to 4 to 20 mA
circuits
Complete product information:
www.e-direct.us/ria251
Specs at a glance:
• Voltage drop: < 2 V
• Display: 5 digit LC display
• Protection: IP 65
• Accuracy: < 0.1% of display
range
Digital loop-powered display
RIA251
$ 233.00

2. RIA251 2
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Application / Function
Application The RIA251 process
display monitors measurement signals
and displays them with high
resolution and accuracy. It can be
easily installed in switch cabinets,
control rooms, with laboratory
equipment, plant and equipment
facilities.
Function The process display module
is directly connected to the 4 to 20
mA measurement circuit. Parameters
such as the measurement range can
be set using the three pushbuttons on
the face of the unit. Parameter setting
is possible during operation. The
readings are shown on a five-digit,
seven-segment LC display.
Application example
System component
without own transmitter
loop power supply,
e.g. printers, displays, PLC…
Setting up transmitters
using HART®communication
Active barrier RN221N
RIA251
as front end display
Temperature sensor with
electronic insert TMT181/182
Zone

3. RIA251 3
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DimensionsTechnical data
Technical data Dimensions (in inches)
Input
Input 4 to 20 mA (reverse-polarity protection)
Measured parameter Current
Max. input current 150 mA (short circuit current)
Accuracy < 0.1 % of full scale
Temperature drift < 0.01 %/10K
Output
Voltage drop < 2 V
HART® The display allows transmission of the
HART® transmission protocol
Operating conditions
Ambient temperature -20 to +60 °C (-4 to +140 °F)(Ex/non Ex)
Storage temperature -30 to +70 °C (-22 to +158 °F)
Climate category to standard EN 60654-1 Class B2
EMC Interference emission to EN 5011 Group 1,
Class A; interference immunity to EN
61000-4-2 up to 61000-4-6
Protection Front IP 65, terminals IP 20
Panel cutout
1.77
3.62
1.89
3.78
Mechanical construction
Materials Front of housing: Die-cast aluminium;
housing tube: galvanized steel plate; rear
panel of housing: ABS plastic
Electrical connection Plug-in screw terminals (can be fixed
permanently), terminal area 1.5 mm², solid,
1.0 mm² strand with threaded sleeve
User interface
Display 5-digit LC display, 17 mm (0.67”) range of
display: -19000 to +99999
Operation 3 buttons
Power supply
Supply Via 4 to 20 mA loop supply
Approvals
Ex approval ATEX II 1 G EExia IIC T6

4. RIA251 4
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Price table
Process indicator RIA251 Order no. Price/pcs. in USD
Approval 1 to 5 6 to 10 11 to 35
Non-hazardous area RIA251-A1 265.00 246.00 233.00
ATEX II1G EEx ia IIC T6 RIA251-B1 309.00 287.00 272.00
Prices valid until 09.30.2013 in U.S. dollars per unit (not including shipping and applicable sales tax).
See Endress+Hauser, Inc. Terms and Conditions of Sale for shipping, tax, and payment terms.
Complete product information:
www.e-direct.us/ria251
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Y
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1 2 3 4
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Contact
E-direct
Endress+Hauser, Inc.
2350 Endress Place
Greenwood, IN 46143
Direct order
Internet www.e-direct.us
by phone 888-EH-DIRECT
(343-4732)
per Fax 317-535-8498
E-Mail e-direct@us.endress.com