MODEL: 18SN

18SN SPECIFICATIONS

ES-1819 Rev.8 Page 1/4

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

Rack-mounted DCS Signal Conditioners 18-RACK

INPUT LOOP POWERED ISOLATOR

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

MODEL: 18SN–[1][2]0

ORDERING INFORMATION

• Code number: 18SN-[1][2]0

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

(e.g. 18SN-A60)

[1] INPUT

Current

A: 4 – 20 mA DC

H: 10 – 50 mA DC

[2] OUTPUT 1

Current

A: 4 – 20 mA DC

Voltage

6: 1 – 5 V DC

OUTPUT 2

0: None

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

connector

Screw terminal: Nickel-plated steel

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 CURRENT [mA]

4

12

20

5.0

approx.

3.7

3.0

approx. 5.0

4.0