ES-1951 Rev.10
LDSN
INPUT LOOP POWERED ISOLATOR
(super-miniature size)
Functions & Features
• Loop-powered design eliminates output loop power supply
• 500 V DC input-to-output isolation
• 350 Ω output drive with 4 – 20 mA
Typical Applications
• Isolation between control room and field instrumentation, between telemetering system and input device
• Eliminates ground problems in existing systems thanks to easiness of application without requiring additional power wiring
• Can be used as field-I/O terminals
MODEL: LDSN–[1][2][3]
ORDERING INFORMATION
• Code number: LDSN–[1][2][3]
Specify a code from below for each of [1] through [3].
(e.g. LDSN-A6/D/Q)
• Specify the specification for option code /Q
(e.g. /C01/S01)
[1] INPUT
Current
A
: 4 – 20 mA DC
H
: 10 – 50 mA DC
[2] OUTPUT
Current
A
: 4 – 20 mA DC
Voltage
6
: 1 – 5 V DC
[3] OPTIONS (multiple selections)
Mounting
blank
: Surface
/D
: DIN rail
Other Options
blank
: none
/Q
: Option other than the above (specify the specification)
SPECIFICATIONS OF OPTION: Q (multiple selections)
COATING (For the detail, refer to our web site.)
/C01
: Silicone coating
/C02
: Polyurethane coating
/C03
: Rubber coating
TERMINAL SCREW MATERIAL
/S01
: Stainless steel
GENERAL SPECIFICATIONS
Construction
: Stand-alone; terminal access at the front
Connection
: M4 screw terminals (torque 1.2 N·m)
Screw terminal
: Nickel-plated brass (standard) or stainless steel
Housing material
: Flame-resistant resin (black)
Isolation
: Input to output
Zero adjustment (front)
Voltage output
: -5 to +5 %
Current output
: -0.5 to +0.5 %
Span adjustment (front)
Voltage output
: 95 to 105 %
Current output
: 98.5 to 101.5 %
INPUT & OUTPUT
■ Input 4 – 20 mA DC / Output 1 – 5 V DC
Equivalent input impedance
: Approx. 250 Ω with 20 mA input
Operational range
: 3 – 22 mA DC
(Accuracy is assured within 4 – 22 mA)
Load resistance
: ≥ 50 kΩ
■ Input 10 – 50 mA DC / Output 1 – 5 V DC
Equivalent input impedance
: Approx. 100 Ω with 50 mA input
Operational range
: 7 – 55 mA DC
(Accuracy is assured within 8 – 55 mA)
Load resistance
: ≥ 50 kΩ
■ Input 4 – 20 mA DC / Output 4 – 20 mA DC
Equivalent input impedance
: 230 Ω plus load resistance with 20 mA input
Operational range
: 3 – 22 mA DC
(Accuracy is assured within 4 – 22 mA)
Load resistance
: 50 – 350 Ω (min. 50 Ω required for adequate operation)
■ Input 10 – 50 mA DC / Output 4 – 20 mA DC
Equivalent input impedance
: 90 Ω + [load resistance×0.16] with 50 mA input
Operational range
: 7 – 55 mA DC
(Accuracy is assured within 8 – 55 mA)
Load resistance
: 50 – 600 Ω (min. 50 Ω required for adequate operation)
•INPUT 4 – 20 mA DC / OUTPUT 1 – 5 V DC
•INPUT 10 – 50 mA DC / OUTPUT 1 – 5 V DC
•INPUT 4 – 20mA DC / OUTPUT 4 – 20 mA DC
•INPUT 10 – 50 mA DC / OUTPUT 4 – 20 mA DC
INSTALLATION
Operating temperature
: -10 to +55°C (14 to 131°F)
Operating humidity
: 30 to 85 %RH (non-condensing)
Mounting
: Surface or DIN rail
Weight
: 100 g (0.22 lb) for surface mounting
120 g (0.24 lb) for DIN rail mounting
PERFORMANCE in percentage of span
Accuracy
: ±0.1 %
Temp. coefficient
Voltage output
: ±0.015 %/°C (±0.008 %/°F)
Current output
: ±0.02 %/°C (±0.01 %/°F)
Response time
Voltage output
: ≤ 0.5 sec. (0 – 90 %)
Current output
4 - 20 mA DC input
: Approx. 45 msec. (0 – 90 %, 50 Ω load)
10 - 50 mA DC input
: Approx. 15 msec. (0 – 90 %, 50 Ω
load)
Load effect (current output)
4 – 20 mA input
: 0.015 %/Ω (50 – 150 Ω)
0.003 %/Ω (150 – 350 Ω)
10 – 50 mA input
: 0.015 %/Ω (50 – 100 Ω)
0.003 %/Ω (100 – 600 Ω)
(The unit is calibrated with 250 Ω load at the factory.)
Insulation resistance
: ≥ 100 MΩ with 500 V DC
Dielectric strength
:
500 V AC @1 minute (input to output)
2000 V AC @1 minute (input or output to ground)
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
MOUNTING REQUIREMENTS unit: mm [inch]
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM