ES-1828 Rev.9
18DU
Rack-mounted DCS Signal Conditioners 18-RACK
CURRENT LOOP SUPPLY
(10 – 50 mA / 4 – 20 mA loop)
Functions & Features
• Powering a current loop
• 10 – 50 mA or 4 – 20 mA jumper selectable
• Isolation
• Shortcircuit protection
• Applicable to smart transmitters
• Usable as Isolator for 10 – 50 mA / 4 – 20 mA DC signals
• Second channel output available at the front terminals and at the Standard Rack connector
Typical Applications
• Various 2-wire transmitters
MODEL: 18DU–66–R
ORDERING INFORMATION
• Code number: 18DU-66-R
INPUT
Current
10 – 50 mA DC or 4 – 20 mA DC
OUTPUT 1
Voltage
6
: 1 – 5 V DC (Load resistance 2000 Ω min.)
OUTPUT 2
Voltage
6
: 1 – 5 V DC (Load resistance 2000 Ω min.)
POWER INPUT
DC Power
R
: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)
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)
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 +120 % at 1 – 5 V
Zero adjustment
: -5 to +5 % (front)
Span adjustment
: 95 to 105 % (front)
Input range selector
: Jumper pin on the PCB
The input is factory set to 10 – 50 mA DC. Specify when 4 – 20 mA is required.
SUPPLY OUTPUT
Output voltage
: 24 – 28 V DC with no load
Current rating
: ≤ 60mA DC
■
Shortcircuit Protection
Current limited
: 77 mA maximum
Protected time duration
: No limit
INPUT SPECIFICATIONS
■
DC Current
:
Input resistor incoporated
110 Ω ±1 % with 10 – 50 mA
260 Ω ±1 % with 4 – 20 mA
OUTPUT SPECIFICATIONS
The output goes below 0 % when the input is open.
INSTALLATION
Current consumption
: Approx. 105 mA
Operating temperature
: -5 to +55°C (23 to 131°F)
Operating humidity
: 30 to 90 %RH (non-condensing)
Mounting
: Standard Rack 18BXx or 18KBXx
Weight
: 150 g (0.33 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.1 %
Temp. coefficient
: ±0.015 %/°C (±0.008 %/°F)
Response time
: Approx. 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
: 1500 V AC @ 1 minute
(input to output 1 or output 2 or power)
500 V AC @ 1 minute
(output 1 to output 2 to power)
1500 V AC @ 1 minute
(input or output or power to ground)
EXTERNAL DIMENSIONS unit: mm [inch]
TERMINAL ASSIGNMENTS
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM