Wago 857-421 Data Sheet

Isolation amplifier; Current input signal; Current output signal; Supply
voltage: 24 VDC; 6 mm module width

This item has been discontinued and as of 20.02.2019, can no longer be delivered.

Data sheet | Item number:857-421

857-421

!

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This item has been discontinued and as of 20.02.2019, can no longer be delivered.

Item description

Short description:

The HART Repeater Power Supply links SMART transmitters located in the field. It provides the power required and transmits the analog signals in
an electrically isolated way.

Features:

HART communication

Power supply to SMART transmitters

Safe 3-way isolation with 2.5kV test voltage per EN 61140

Data

Technical Data

Configuration

Configuration options permanently configured

Input

Input signal type Current

Data sheet | Item number:857-421

857-421

!

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This item has been discontinued and as of 20.02.2019, can no longer be delivered.

Input signal, current 4 … 20mA (with superimposed HART signal)

Input resistance (intput/current) ≤50Ω

Sensor supply U = 18 V; 30 mA

v

Max. input current Max. power supply

Output

Output signal type Current

Output signal current 4 … 20 mA (with superimposed HART signal)

Load impedance (output/current) 230 … 600Ω

Offset ≤20µA

Residual ripple ≤10mV (rms)

Signal processing

Max. operating frequency 100Hz (HART signal: ≥ 2.5 kHz)

Step response typ. 3.5ms

Measurement error

Transmission error typ. ≤ 0.1 % of upper range value

Temperature coefficient ≤ 0.01 %/K

Power supply

Type of power supply 24 VDC

Nominal supply voltage U

S

DC24V

Supply voltage range ±30%

Current consumption at supply voltage ≤45mA

Safety and protection:

Test voltage (input/output/supply) AC 2.5kV;50Hz;1min

Protection class IP20

Approvals / Certificates

UL-Approvals

Logo Approval Additional Approval Text

Certificate
name

UL

UL International Netherlands B.V. (ORDINARY
LOCATIONS)

UL 508 E175199

Sec.4

!

Data sheet | Item number:857-421

857-421

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This item has been discontinued and as of 20.02.2019, can no longer be delivered.

Compatible products

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Switched-mode power supply; for JUMPFLEX® Signal Conditioners; 1-phase; 24 VDC output voltage; 1
A output current

787-2852

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Data sheet | Item number:857-421

857-421

!

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