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

18KDYH2

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
• Possible to pull out the module from the nest with screw terminals fixed, for insulation test of field wiring.
Typical Applications
• 2-wire HART transmitters

MODEL: 18KDYH2–A6A–R[1]

ORDERING INFORMATION
• Code number: 18KDYH2-A6A-R[1]
Specify a code from below for [1].
(e.g. 18KDYH2-A6A-R/B)

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

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

OUTPUT 2
Current
A: 4 – 20 mA DC (Load resistance 600 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.)

[1] OPTIONS
Opencircuit detection
blank: none
/B: Opencircuit detector

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
Housing material: Flame-resistant resin (black)
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)
Opencircuit detection: Input current 0 mA when the output loop is open.
Photo MOS 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 min. 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.

HART COMMUNICATION
Transmission gain: Approx. -3 dB (within 1 – 3 kHz)
measured with 250 Ω at output
Loop impedance: 250 Ω ±10 %
Communication directions: Bidirectional

INSTALLATION
Current consumption: Approx. 120 mA
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Standard Rack 18KBXx
Weight: 110 g (0.24 lb)

PERFORMANCE in percentage of span
Accuracy: ±0.1 %
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F)
Response time: ≤ 0.5 sec. (0 – 90 %)
Line voltage effect
  Supply output: ±3 % over voltage range
  Output signal: ±0.1 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 500 V AC @ 1 minute (input to output 1 to output 2 to power to ground)

EXTERNAL DIMENSIONS unit: mm (inch)

TERMINAL ASSIGNMENTS

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.