Endress+Hauser RIA15 Manual
Compact process display unit with very low voltage drop for universal use to
display 4 to 20 mA/HART® signals
Application
• Display of 4 to 20 mA measured values or optionally up to
four of a sensor's HART® process variables in all industries
• Use as primary or secondary HART® master
• Panel-mount housing or field housing as local display
• Scalable display value
Your benefits
• No external power supply required
• Voltage drop ≤1 V (HART® ≤1.9 V)
• 5-digit measured value display with 17 mm (0.67 in) digit
height with dimension and bar graph; background lighting
can be activated
• Minimal installation depth
• Easy 3-key operation for configuring the device
• International approvals
ATEX, IECEx, FM, CSA
• SIL interference freeness acc. to EN 61508
• GL marine approval
Products Solutions Services
Technical Information
RIA15
Loop-powered 4 to 20 mA process display unit with
optional HART® communication
TI01043K/09/EN/05.15
71300884
RIA15
2 Endress+Hauser
Function and system design
Measuring principle The RIA15 process display unit is integrated in the 4 to 20 mA or HART® loop and transmits the
measuring signal or HART® process variables in digital form. The process display unit does not
require an external power supply. It is powered directly from the current loop.
The device meets the requirements of the HART® Communication Protocol Specifications and can be
used with devices with HART® Revision ≥ 5.0.
The LC display is easy to read even in bright sunlight and enables 5-digit, scalable measured value
display. In addition to measured value display, the associated value dimension and a bar graph can
be easily configured with simple 3-key operation.
The device can also be operated with backlighting where necessary. In such cases pay attention to
the higher voltage drop.
When used in conjunction with the Micropilot FMR20 radar level sensor, the RIA15 unit can also be
used to make the basic settings for the Micropilot FMR20. The RIA15 must be ordered with the
relevant option for FMR20 basic setting in this case.
Measuring system
Zone 1, 2 Zone 1, 2
Zone 0, 1, 2
A0018915-EN
1 RIA15 as field and panel display
Input
Voltage drop
Standard device with 4 to 20 mA communication ≤ 1.0 V
Device with HART® communication ≤ 1.9 V
Display lighting additionally 2.9 V
HART® input impedance
Rx = 40 kΩ
Cx = 2.3 nF
Measured variable The input variable is either the 4 to 20 mA current signal or the HART® signal.
HART® signals are not affected.
RIA15
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Measuring range 4 to 20 mA (scalable, reverse polarity protection)
Max. input current 200 mA
Power supply
Terminal assignment NOTICE
SELV/Class 2 device
‣The device may only be powered by a power unit with an energy-limited circuit in accordance
with IEC 61010-1: 'SELV or Class 2 circuit'.
Device destroyed if current too high
‣Do not operate the device at a voltage source without a current limiter. Instead, operate the
device only in the current loop with a transmitter.
Terminal Description
+ Positive connection, current measurement
- Negative connection, current measurement (without backlighting)
LED Negative connection, current measurement (with backlighting)
Auxiliary terminals (electrically connected internally)
Functional grounding:
• Panel-mounted device:
Terminal on the rear of the housing
• Field device:
Terminal in the housing
Connection 4 to 20 mA
Connection without backlighting Connection with backlighting
Connection with transmitter power supply
and transmitter
LED
-
+
-
-
+
+
I
Y
1
A0017704
1 Transmitter power supply
+
+
I
Y
1
-
-
LED
-
+
A0017705
1 Transmitter power supply
Connection with transmitter power supply
and transmitter using the auxiliary
terminal
-
-
+
+
I
Y
1
LED
-
+
A0017706
1 Transmitter power supply
+
+
I
Y
1
-
-
LED
-
+
A0017707
1 Transmitter power supply
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4 Endress+Hauser
Connection without backlighting Connection with backlighting
Connection with PLC and transmitter
-
-
+
+
I
Y
1
LED
-
+
A0019720
1 PLC
-
-
+
+
I
Y
1
LED
-
+
A0019721
1 PLC
Connection without transmitter power
supply directly in the 4 to 20 mA circuit
+
2
-
I
Y
LED
-
+
A0017708
2 4 to 20 mA power source
+
2
-
I
Y
LED
-
+
A0017709
2 4 to 20 mA power source
HART® connection
Circuit diagram / Description
2-wire sensor with
process display unit
and LPS, without
backlighting
Y
I
RsDC
1
2
3
LED
-
+
A0019567
1 Sensor
2 Power supply
3 HART® resistance
2-wire sensor with
process display unit
and LPS, with
backlighting
Y
I
RsDC
1
2
3
LED
-
+
A0019568
1 Sensor
2 Power supply
3 HART® resistance
4-wire sensor with
process display unit
and LPS, without
backlighting
1
3
Y
I
2
4
LED
-
+
A0019570
1 HART® resistance
2 Current meter
3 Sensor
4 Power supply
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Circuit diagram / Description
4-wire sensor with
process display unit
and LPS, with
backlighting
1
3
Y
I
2
4
LED
-
+
A0019571
1 HART® resistance
2 Current meter
3 Sensor
4 Power supply
Current output with
process display unit
and actuator (e.g.
actuator valve),
without backlighting
13
2
LED
-
+
A0019573
1 Actuator
2 Power supply
3 Current output
Current output with
process display unit
and actuator (e.g.
actuator valve), with
backlighting
13
2
LED
-
+
A0019574
1 Actuator
2 Power supply
3 Current output
Multi-drop 2-wire
sensors with process
display unit and LPS
RsDC
1
2
3
Y
I
LED
-
+
Y
I
Y
I
A0019575
1 Sensors
2 Power supply
3 HART® resistance
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Circuit diagram / Description
Multidrop 2-wire
sensors with process
display unit and LPS,
with backlighting
RsDC
1
2
3
I
Y
Y
I
Y
I
LED
-
+
A0019722
1 Sensors
2 Power supply
3 HART® resistance
2-wire sensor with
process display unit
and active barrier
RN221N as LPS
Y
I
12
3
O+
O-
RN221N
Rs
R
LED
-
+
A0019576
1 Sensor
2 HART® primary master
3 HART® resistance
The HART® communication resistance of 230 Ω in the signal line is always necessary in the
case of a low-impedance power supply. It must be installed between the power supply and the
display unit.
A HART® communication resistance module is available as an accessory → 13.
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Connection with optional HART® communication resistance module
Circuit diagram / Description
2-wire sensor with
process display unit
and transmitter power
supply, without
backlighting
1
LED
-
+
3
2
Y
I
RsDC
A0020839
1 HART® communication resistance module
2 Sensor
3 Power supply
2-wire sensor with
process display unit
and transmitter power
supply, with
backlighting
1
3
2
Y
I
RsDC
LED
-
+
A0020840
1 HART® communication resistance module
2 Sensor
3 Power supply
4-wire sensor with
process display unit
and transmitter power
supply, without
backlighting
1
3
Y
I
2
LED
-
+
A0020837
1 HART® communication resistance module
2 Power supply 4-wire device
3 Sensor
4-wire sensor with
process display unit
and transmitter power
supply, with
backlighting
1
3
Y
I
2
LED
-
+
A0020838
1 HART® communication resistance module
2 Power supply 4-wire device
3 Sensor
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Wiring with switchable backlighting
An additional current-limited current source is required to implement switchable backlighting, e.g.
active barrier RN221N. This current source is used to supply the LED backlighting of up to 7 RIA15
process display units without causing an additional voltage drop in the measurement loop. The
backlighting can be switched on and off using an external switch.
LED
-
+
-
+
I
Y
1
+
-
O-
LNPE
O+
7
6
5
+
-
O-
LNPE
O+
8
4
2
3
9
10
A0028248
1 Process display unit RIA15
2 3-wire connector, e.g. WAGO 221 series
3 2-wire sensor
4 Terminal block on top-hat rail
5 Active barrier, e.g. RN221N
6 4 to 20 mA output to the control unit
7 Power supply
8 Current source, e.g. RN221N
9 Switch to activate backlighting
10 Power supply
Supply voltage The display unit is loop-powered and does not require any external power supply. The voltage drop is
≤1 V in the standard version with 4 to 20 mA communication, ≤1.9 V with HART® communication
and an additional 2.9 V if display lighting is used.
Performance characteristics
Reference operating
conditions
Reference temperature 25 °C ±5 °C (77 °F ±9 °F)
Humidity 20 to 60 % relative humidity
Maximum measured error Input Range Measured error of measuring range
Current 4 to 20 mA
Over range up to 22 mA
±0.1 %
Resolution Signal resolution > 13 bit
Influence of ambient
temperature
< 0.02 %/K (0.01 %/°F) of measuring range
Warm-up period 10 minutes
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Installation
Mounting location Panel housing
The device is designed for use in a panel.
Required panel cutout 45x92 mm (1.77x3.62 in)
Field housing
The field housing version is designed for use in the field. The unit is mounted directly on a wall, or
on a pipe with a diameter of up to 2 " with the aid of an optional mounting bracket. An optional
weather protection cover protects the device from the effects of weather conditions.
Orientation Panel housing
The orientation is horizontal.
Field housing
The device must be mounted in such a way that the cable entries point downwards.
Environment
Ambient temperature range –40 to 60 °C (–40 to 140 °F)
At temperatures below –25 °C (–13 °F) the readability of the display can no longer be
guaranteed.
Storage temperature –40 to 85 °C (–40 to 185 °F)
Climate class IEC 60654-1, Class B2
Altitude Up to 5 000 m (16 400 ft) above MSL in accordance with IEC61010-1
Degree of protection Panel housing
IP65 at front, IP20 at rear
Field housing
IP67, NEMA4x (aluminum housing)
Electromagnetic
compatibility
• Interference immunity:
As per IEC61326 (Industrial Environments) / NAMUR NE 21
Maximum measured error < 1 % of MR
• Interference emission:
As per IEC61326, Class B
Electrical safety Class III, overvoltage protection category II, pollution degree 2
RIA15
10 Endress+Hauser
Mechanical construction
Design, dimensions Panel-mount housing
109.75 (4.32)
48 (1.89)
96 (3.78)
89.5 (3.52)
37 (1.46) 4.5 (0.18)
42.75 (1.68)
mm (in)
A0017721
2 Dimensions of the panel housing
Required panel cutout 45x92 mm (1.77x3.62 in), max. panel thickness 13 mm (0.51 in).
Field housing
131 (5.16) 55.5 (2.19)
106.5 (4.19)
81.5 (3.21)
mm (in)
A0017722
3 Dimensions of the field housing incl. cable glands (M16)
Weight Panel-mount housing
115 g (0.25 lb.)
Field housing
• Aluminum: 520 g (1.15 lb)
• Plastic: 300 g (0.66 lb)
Materials Panel-mount housing
Front: aluminum
Rear panel: polycarbonate PC
Field housing
Aluminum or plastic (PBT with steel fibers, antistatic)
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6
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