Endress+Hauser RTA421 Manual

TI00074R/09/EN/02.12

71196717

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

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

RTA421

2Endress+Hauser

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.

a0016740

1Pump

2 Signal input with loop power supply

3Relays

Alarm set point function

Mode Minimum, Maximum

Switch threshold 00 to 99%

Hysteresis 01to 99%

Time delay 00 to 99 s

Reaction time 0.4 s

RTA421

Endress+Hauser 3

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

Relays

Output signal Terminal 81: 24 V ±20%, 30 mA

Number 1

Galvanic isolation Between power supply and relay outputs

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

RTA421

4Endress+Hauser

Power supply

Terminal assignment

a0016729

1Relay2

2Relay1

3 Analog input with loop power supply

4 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

41 42 43

51 52 53

L/L+ N/L-

11 15 16 81

Power supply Relays (internal circuit)

Relay 1 Relay 2

Contact condition shown in alarm or power off state

L/L+ N/L-

41 42 43

51 52 53

RTA421

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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: 1% 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)

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

RTA421

6Endress+Hauser

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

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

a0016739

1 LED´s: Operational display, fault display, condition display set point relays

2 Selection keys

3Enterkey

4 4 digit LC display with alarm markings and bargraph

95 (3.74)

107.8 (4.24)

112 (4.41)

45 (1.77)

mm (in)

RTA421

Endress+Hauser 7

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 ÉSelect

country ÉInstruments ÉSelect device ÉProduct 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 Operating instructions BA00101R/09/

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

[email protected]

TI00074R/09/EN/02.12

71196717

FM9

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