·Some details are not shown. Please refer to specification sheets for all information.

A3DYH

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

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
(applicable wire size: 0.2 to 2.5 mm2, stripped length: 8 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)
Mounting: DIN rail
Weight: 130 g (0.29 lb)

PERFORMANCE in percentage of span
Accuracy: ±0.1 %
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F)
Response time: ≤ 0.1 sec. (0 – 90 %)
Line voltage effect: ±0.1 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 1500 V AC @ 1 minute
(input to output or power to ground)
500 V AC @ 1 minute (output to power)

STANDARDS & APPROVALS
Refer to the manuals to comply with the standards.
EU conformity:
ATEX Directive  (for ATEX intrinsic safety)
  Ex ia EN 60079-11
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
RoHS Directive
  EN 50581
Safety approval:
FM: Intrinsically safe associated apparatus
  Class I, Div. 1, Groups A, B, C and D
  Class II, Div. 1, Groups E, F and G
  Class III, Div. 1
  Class I, Zone 0, [AEx ia] IIC
  (Class 3600)
  (Class 3610)
  (ANSI/ISA 60079-0)
  (ANSI/ISA 60079-11)

HART COMMUNICATION

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.