Limit switch with loop power supply
RTA421
Linha de atendimento
+351 212 388 403
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2 relays for setpoint monitoring (with changeover contacts)
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LC display for alarm setpoints and bargraph
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Front end setup using 3 push buttons
Specs at a glance
Limit function 2 relays Input Current, voltage Transmitter power supply Optional Time delay 0 to 99 s Product / Version Price / pcs. in EUR Order code Loop Power Supply Power Supply 1 to 3 4 to 10 11+ without 196-250VAC 139,- 129,- 122,- RTA421-A11A 98-126VAC 139,- 129,- 122,- RTA421-A21A 20-250VDC/AC 170,- 158,- 150,- RTA421-A31A with 196-250VAC 170,- 158,- 150,- RTA421-A12A 98-126VAC 170,- 158,- 150,- RTA421-A22A 20-250VDC/AC 202,- 188,- 177,- RTA421-A32A Accessory
Product / Version Price / pcs. in EUR Order code Housing Field, R4 182x180x165, 5xM20, PC Protection housing Minitec. Synthetic housing with transparent cover. Protection IP66. 4x22.5mm / 2x45mm. Usage: FTL825. 74,96 52010132 Prices valid until 31.12.2019 in EUR per unit (not including shipping and applicable sales tax). See
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Application
The RTA421 contactor is used to monitor and protect industrial processes. The unit has two independent relays which offers a number of cost-effective applications such as pump control in wastewater technology and level monitoring in containers. The quick setup feature allows for changes of limit values and the unit is particularly suited for use in plant and engineering applications as well as switching cabinets.
Function
The instrument evaluates current signals (0/4 to 20 mA) and voltage signals (0/2 to 10 V) and switches upon going over or under the predefined limit values. Both limit values are shown on the display. The bargraph displays the connected signal in percentages. A 2-digit bar code is available as an option to prevent entry of limit value.
Application Example
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Technical data
InputInput Current: 0/4 to 20 mA, 20 to 0/4 mA, max. 150 mA, Ri: 5 Ω;
Voltage: 0/2 to 10 V, 10 to 0/2 V, max. 50 V, Ri: 1 MΩ;
Integration time: 4/s
Accuracy 0.5 % FSD Temperature drift 0.02 % / K ambient temperature OutputOutput (option) 24 V ± 20 %, 30 mA Output (Relays) 2, binary, switches when alarm setpoint is reached, 1 potential free changeover contact per relay,
Contact load ≤ 250 V AC, 8 A, 30 V DC, 5 AMechanical constructionHousing (W × H × D) 45 × 110 × 112 mm (1.77" × 4.33" × 4.41") Weight Approx. 150 g (5.29 oz) Materials Housing Plastic PC/ABS, UL 940 Electrical connection Keyed, plug on screw terminals, core sizes flexible to 1.5 mm² User interfaceLED Operation, 1 × green (2 mm/0.08")
Fault condition, 1 × red (2 mm/0.08")
Alarm setpoint, 2 × yellow (2 mm/0.08")
LC display Numeric display 4 × 7 segment (6 mm/0.24”);
alarm setpoint condition 2 × channel number, 4 × 1 segment;
bargraph 10 x 1 segment
Display range 2 × 0 to 99 % Operation 3 pushbutton operation Power supplySupply voltage 196 to 250 V AC, 50/60 Hz
98 to 126 V AC, 50/60 Hz
20 to 250 V DC/AC, 50/60 Hz
Power consumption Max. 9 VA Dimensions (in mm)
Installation according to instruction manual
Electrical connection
a) Power supply
b) Relays (internal circuit)
c) Relay 1
d) Relay 2
e) Contact condition shown in alarm or power out
f) Current input
g) Current input with loop power supply (option)
h) Voltage input
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