MODEL: 18DYH2
Rack-mounted DCS Signal Conditioners 18-RACK
[1] OPTIONS
Opencircuit detection
blank: none
CURRENT LOOP SUPPLY
(applicable to HART signal, opencircuit detection selectable)
Functions & Features
/B: Opencircuit detector
• Powers a 4 – 20 mA DC current loop
• Isolates and relays HART signals
• Shortcircuit protection
GENERAL SPECIFICATIONS
Construction: Rack-mounted; terminal access via screw
terminals on the front and connector on the rear; terminal
cover provided
• Opencircuit detection selectable
Connection
Typical Applications
Input: M3.5 screw terminals (torque 0.8 N·m)
Output 1: Connector
• 2-wire HART transmitters
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)
Opencircuit detection: Input current 0 mA when the output
loop is open.
Photo MOSFET Relay ON Resistance; 3 Ω max.
MODEL: 18DYH2–A6A–R[1]
SUPPLY OUTPUT
ORDERING INFORMATION
• Code number: 18DYH2-A6A-R[1]
Specify a code from below for [1].
(e.g. 18DYH2-A6A-R/B)
(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
INPUT
Current
Current limited: 30 mA max.
Protected time duration: No limit
A: 4 - 20 mA DC (Input resistance approx. 250Ω)
INPUT SPECIFICATIONS
■ DC Current: Input resistor incorporated
Input current: ≥ 0 mA
OUTPUT 1
Voltage
6: 1 – 5 V DC (Load resistance 2000 Ω min.)
OUTPUT SPECIFICATIONS
The output goes below 0 % when the input is open.
OUTPUT 2
Current
A: 4 – 20 mA DC (Load resistance 600 Ω max.)
250 Ω ±10% for HART communication
HART COMMUNICATION
Transmission gain: Approx. -3 dB (within 1 – 3 kHz)
measured with 250 Ω at output
POWER INPUT
DC Power
Loop impedance: 250 Ω ±10 %
Communication directions: Bidirectional
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)
INSTALLATION
Current consumption: Approx. 120 mA
Operating temperature: -5 to +55°C (23 to 131°F)
18DYH2 SPECIFICATIONS
ES-1832 Rev.2 Page 1/3
http://www.m-system.co.jp/