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Technical Information
RTA421
Limit alarm switch
Alarm switch and power supply for monitoring current or voltage
signals
Application
• Plant and machine construction
• Panel builders
• Process monitoring
• Process control
TI00074R/09/EN/02.12
71196717
Your benefits
• 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
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Summary of Contents for Endress+Hauser RTA421
- Page 1 Technical Information RTA421 Limit alarm switch Alarm switch and power supply for monitoring current or voltage signals Application Your benefits • Plant and machine construction • 2 relays for set point monitoring (with SPDT contacts) • Panel builders • Loop power supply for connected sensors •...
- Page 2 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.
- Page 3 RTA421 Input Number 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...
- Page 4 RTA421 Power supply Terminal assignment 51 52 53 41 42 43 11 15 16 81 L/L+ N/L- a0016729 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...
- Page 5 RTA421 Current input Current input with loop power supply Voltage input 0/4…20 mA 4…20 mA 0/2…10 V DC 11 16 11 15 Terminals Keyed, plug on screw terminals, core sizes flexible to 2.5 mm (13 AWG) Fuse 315 mA, slow blow Input current limit <...
- Page 6 RTA421 Mechanical construction Design, dimensions 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 45 (1.77) 112 (4.41) mm (in) a0016637 Weight approximately 150 g (0.33 lb.)
- Page 7 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...
- Page 8 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/02.12 71196717...
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Questions and answers
**** să mă întorc la setările normale am băgat ceva greșit 20 -4 mA și ledul roșu flash nu Ami mai da voie sa schimb input volt și mA mulțumesc