RTA421
Technical Information
RTA421
Limit alarm switch
Alarm switch and power supply for monitoring current or voltage
signals
Application
Your benefits
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Plant and machine construction
Panel builders
Process monitoring
Process control
TI00074R/09/EN/01.11
71157628
2 relays for set point monitoring (with SPDT contacts)
Loop power supply for connected sensors
LC display for alarm set points and bar graph
Compact housing
Front end setup using 3 push buttons
RTA421
Function and system design
Measuring system
The RTA421 contactor monitors industrial processes for safe operation. The unit analyses current (0/4...20
mA) and voltage signals (0/2...10 V) and switches two independent output relays if the values either exceed
or undercut the preset alarm set points.
Applications include pump control in the waste water industry, level measurement in silos can be economically
achieved.
3
1
2
a0016740
1
2
3
Alarm set point function
2
Pump
Signal input with loop power supply
Relays
Mode
Minimum, Maximum
Switch threshold
00 to 99%
Hysteresis
01to 100%
Time delay
00 to 99 s
Reaction time
0.4 s
Endress+Hauser
RTA421
Input
Number
1
Measured variable
Current and voltage
Measuring range
Voltage
0/2...10 V, max. voltage 50 V
Ri: 1 MΩ
Current
0/4...20 mA; max. current 150 mA
Ri: 5 Ω
Resolution
Voltage
41 mV, 8 Bit
Current
83 μA, 8 Bit
Overrange
10 %
Integration time
4/s
Output
Output signal
Loop power supply
Output signal
Terminal 81: 24 V ±20%, 30 mA
Number
1
Galvanic isolation
Between power supply and relay outputs
Relays
Endress+Hauser
Output signal
Binary, switches when alarm set point is reached
Number
2
Contact type
SPDT potential free contact per relay
Contact load
≤ 250 VAC, 8(2) A / 30 VDC, 5(2) A
3
RTA421
Power supply
Terminal assignment
1
51 52 53
2
3
4
41 42 43
11 15 16 81
L/L+ N/La0016729
1
2
3
4
Relay 2
Relay 1
Analog input with loop power supply
Power supply (20...250 V DC/AC, 196...250 V AC, 98...128 V AC)
Supply voltage
196...250 VAC, 50/60 Hz
98...126 VAC, 50/60 Hz
20...250 VDC/AC, 50/60 Hz
Power consumption
Max. 9 VA
Electrical connection
Power supply
Relays (internal circuit)
Relay 1
41
L/L+
42
Relay 2
43
51
52
53
N/LContact condition shown in alarm or power off state
4
Endress+Hauser
RTA421
Current input
Current input with loop power supply
Voltage input
0/4…20 mA
4…20 mA
0/2…10 V DC
-
+
-
+
Y
- I+
11 16
11 15
16 81
Terminals
Keyed, plug on screw terminals, core sizes flexible to 2.5 mm2 (13 AWG)
Fuse
315 mA, slow blow
Input current limit
Imax / In < 15
Overvoltage protection
As per IEC 61010-1
Overvoltage category II, Installation area excessive current system ≤ 10 A
Performance characteristics
Maximum measured error
Voltage / current
Accuracy: 0.5% FSD
Influence of ambient
temperature
Voltage / current
Temperature drift: 0.02% / K (0.011% / °F) of ambient temperature
Installation
Orientation
no restrictions
Environment
Ambient temperature range
-20 °C…+70 °C (-4…+158 °F)
Storage temperature
-20 °C…+70 °C (-4…+158 °F)
Climate class
As per IEC 60 654-1 Class B3
Degree of protection
IP20
Altitude
Up to 2000 m (6560 ft.) above sea level according to IEC 61010-1 (EN 61010-1), CSA 1010.1-92
Electromagnetic compatibility
As per IEC 61326, Class A (industrial environment)
Endress+Hauser
5
RTA421
Mechanical construction
Housing for top hat DIN rail mounting to IEC 60715 TH35
H: 110 mm (4.33 in), W: 45 mm (1.77 in), D: 112 mm (4.41 in)
Dimensions
112 (4.41)
mm (in)
95 (3.74)
45 (1.77)
107.8 (4.24)
Design, dimensions
a0016637
Weight
approximately 150 g (0.33 lb.)
Materials
Housing: Plastic PC/ABS, UL 94V0
Operability
Operating concept
Quick Set
The unit is fitted with a quick set up menu so that if the set points are to be frequently changed this feature can
be started by operating the “+” and “E” push buttons. This means that the set points SP1 and SP2 can be easily
changed even during operation without opening the setting up menu.
If required a 2 digit security code is available in order to stop any changes being made to the alarm set points.
Local operation
4
1
2
3
a0016739
1
2
3
4
6
LED´s: Operational display, fault display, condition display set point relays
Selection keys
Enter key
4 digit LC display with alarm markings and bargraph
Endress+Hauser
RTA421
Both set points are simultaneously visible in the display. The ten segment bargraph additionally displays the
percentage value of the connected signal. The actual percentage measured value in the measurement circuit
can be displayed by operating either the “+” or “-” push button.
Display
LED:
Operation, 1 x green
Fault condition, 1 x red
Alarm set point, 2 x yellow
LC display:
Numeric display: 4 x 7 segments
Alarm set point condition: 2 x channel number, 4 x 1 segment
Bargraph: 10 x 1 segment
Display range
2 x 0 to 99%
Operation
3 key operation (-/+/E)
Certificates and approvals
CE mark
Guidelines 89/336/EWG and 73/23/EWG
Ordering information
Detailed ordering information is available from the following sources:
• In the Product Configurator on the Endress+Hauser website: www.endress.com É Select
country É Instruments É Select device É Product page function: Configure this product
• From your Endress+Hauser Sales Center: www.endress.com/worldwide
!
Note!
Product Configurator - the tool for individual product configuration
• Up-to-the-minute configuration data
• Depending on the device: Direct input of measuring point-specific information such as measuring range
or operating language
• Automatic verification of exclusion criteria
• Automatic creation of the order code and its breakdown in PDF or Excel output format
• Ability to order directly in the Endress+Hauser Online Shop
Accessories
Field housing
IP66 protective housing for field mounting
Order no. 51002468
Documentation
Standard documentation
Endress+Hauser
Operating instructions BA00101R/09/
7
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
TI00074R/09/EN/01.11
71157628
FM9
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