MODEL: 18KDYH2

18KDYH2 SPECIFICATIONS

ES-0430 Rev.3 Page 1/5

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

Rack-mounted DCS Signal Conditioners 18K-RACK

CURRENT LOOP SUPPLY

(applicable to HART signal, opencircuit detection selectable)

Functions & Features

• Powers a 4 – 20 mA DC current loop

• Isolates and relays HART signals

• Shortcircuit protection

• Opencircuit detection selectable

• Module can be retracted without removing wiring for an

insulation test

Typical Applications

• 2-wire HART transmitters

MODEL: 18KDYH2–A[1]–R[2]

ORDERING INFORMATION

• Code number: 18KDYH2-A[1]-R[2]

Specify a code from below for each of [1] and [2].

(e.g. 18KDYH2-A6A-R/B/RE)

INPUT

Current

A: 4 - 20 mA DC (Input resistance approx. 250Ω)

[1] OUTPUT 1 / OUTPUT 2

6A: 1 – 5 V DC (Load resistance 2000 Ω min.)

/ 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*

A6: 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*

/ 1 – 5 V DC (Load resistance 2000 Ω min.)

AA: 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*

/ 4 – 20 mA DC (Load resistance 500 Ω max.)

* 250 Ω ±10% for HART communication

POWER INPUT

DC Power

R: 24 V DC

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

[2] OPTIONS (multiple selections)

Opencircuit detection

blank: none

/B: Opencircuit detector (Only for HART signal)

Connector output polarity reversal

blank: none

/RE: Connector output polarity reversal (Only for HART signal)

GENERAL SPECIFICATIONS

Construction: Rack-mounted; terminal access via screw

terminals on the front and connector on the rear; terminal

cover provided

Connection

Input: M3.5 screw terminals (torque 0.8 N·m)

and connector

Output 1: Connector

Output 2: M3.5 screw terminals (torque 0.8 N·m)

and connector

Power input: Supplied from connector

Screw terminal: Nickel-plated steel

Isolation: Input to output 1 to output 2 to power

Overrange output: Approx. -10 to +110 %

Zero adjustment: -5 to +5 % (front)

Span adjustment: 95 to 105 % (front)

Open-circuit detection: This function enables the input

device to detect open circuit of output circuit isolated from

the input circuit.

Input current 0 mA when the output loop is open.

Photo MOSFET Relay ON Resistance; 3 Ω max.

SUPPLY OUTPUT

(across the terminals 1 – 2)

Output voltage: 24 – 28 V DC with no load

18 V DC at 20 mA

Current rating: ≤ 22 mA DC

• Shortcircuit Protection

Current limited: 30 mA max.

Protected time duration: No limit

INPUT SPECIFICATIONS

■ DC Current: Input resistor incorporated

Input current: ≥ 0 mA

OUTPUT SPECIFICATIONS

The output goes below 0 % when the input is open.

Polarity of connector output is reversed with option code

/RE (with connector output polarity reversal).