MODEL: A3DYH

A3DYH SPECIFICATIONS

ES-5971 Rev.8 Page 1/4

http://www.m-system.co.jp/

Intrinsically Safe Galvanic Isolators A3-UNIT Series

CURRENT LOOP SUPPLY

(HART communication)

Functions & Features

• Powers a 4 – 20 mA DC current loop

• Isolated intrinsically safe associated apparatus: no need of

grounding

• Isolates and relays HART signals bidirectionally

• Shortcircuit protection

• Power LED

Typical Applications

• 2-wire HART transmitters

18 (.71)

106

(4.17)

110.5

(4.35)

mm (inch)

MODEL: A3DYH–[1]A–R

ORDERING INFORMATION

• Code number: A3DYH-[1]A-R

Specify a code from below for [1].

(e.g.: A3DYH-0A-R)

For the safety approval code 2, specify the product’s

destination country using Ordering Information Sheet (No.

ESU-5971).

[1] SAFETY APPROVAL

0: None

1: FM intrinsically safe

2: CENELEC intrinsic safety (ATEX)

INPUT

Current

4 – 20 mA DC

OUTPUT

Current

A: 4 – 20 mA DC

POWER INPUT

DC Power

R: 24 V DC

(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Construction: Stand-alone; terminal access at the front

Connection: Euro type connector terminal

mm)

Housing material: Flame-resistant resin (gray)

Isolation: Input to output to power

Overrange output: Approx. -10 to +110 %

Zero adjustment: -2 to +2 % (front)

Span adjustment: 98 to 102 % (front)

Power indicator LED: Green LED turns on while the power is

supplied.

SUPPLY OUTPUT

■ SUPPLY OUTPUT (across the terminals 1 – 2, 4 – 5)

Output voltage: Approx. 22 V DC with no load 14 V DC

minimum at 20 mA.

A loop-powered device (e.g. indicator) through which the

A3DYH supplies excitation voltage to a two-wire transmitter

causes a certain voltage drop. Be sure that the voltage after

the drop remains within the transmitter’s operating range.

Current rating: ≤ 22 mA DC

• Shortcircuit Protection

Current limited: 30 mA max.

Protected time duration: No limit

INPUT SPECIFICATIONS

■ INPUT: Input resistor incorporated.

Approx. 330Ω as two-wire transmitter excitation supply;

approx. 45 Ω as isolator with 4 – 20 mA input

OUTPUT SPECIFICATIONS

■ LOAD RESISTANCE: 550 Ω max. (230 min. required for

HART communication)

HART COMMUNICATION

Frequency band: 500 Hz – 5 kHz (within -3 dB)

Communication directions: Bidirectional

INSTALLATION

Power consumption

•DC: Approx. 3 W

Operating temperature: -5 to +55°C (23 to 131°F)

Operating humidity: 0 to 95 %RH (non-condensing)