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20VS1D

P. 1 / 2

EM-4431

ISOLATION AMPLIFIER

(top adjustment, for current output, output isolation)

MODEL

20VS1D

INSTRUCTION MANUAL

BEFORE USE ....

Thank you for choosing M-System.  Before use, please check 
contents of the package you received as outlined below.
If you have any problems or questions with the product, 
please contact M-System’s Sales Office or representatives.

 PACKAGE INCLUDES:

 Amplifier ....................................................................... (1)

 MODEL NO.

Confirm Model No. marking on the product to be exactly 
what you ordered.

 INSTRUCTION MANUAL

This manual describes necessary points of caution when 
you use this product, including installation, connection and 
basic maintenance procedures.

POINTS OF CAUTION

 POWER INPUT RATING & OPERATIONAL RANGE

• Locate the power input rating marked on the product and  

confirm its operational range as indicated below:

  15V DC ±2%, approx. 35mA with 20mA output

• When there is spike noises in the power, make a filter with 

an appropriate capacitor and inductor to cut it off.

 ENVIRONMENT

• Indoor use
• When heavy dust or metal particles are present in the air, 

install the unit inside proper housing with sufficient ven-
tilation.

• Do not install the unit where it is subjected to continuous 

vibration.  Do not subject the unit to physical impact.

• Environmental temperature must be within 0 to 60°C (32 

to 140°F) with relative humidity within 10 to 95% RH in 

order to ensure adequate life span and operation.

 WIRING

• Do  not  install  cables  (power  supply,  input  and  output) 

close to noise sources (relay drive cable, high frequency 
line, etc.).

• Do  not  bind  these  cables  together  with  those  in  which 

noises are present.  Do not install them in the same duct.

• Mounting  multiple  isolator  modules  on  single  printed 

wiring board could cause beat.  In such case, use the way 
shown as below to make the power supply oscillation fre-
quency of each module to a same one for prevention.

22kΩ

22kΩ

17

18

20VS1D

17

18

20VS1D

17

18

20VS1D

 INSTALLING THE MODULE

When it is installed on the printed wiring board, land diam

-

eter ø1.5 and through-hole ø0.9  are recommended.

 AND ....

• The unit is designed to function as soon as power is sup

-

plied, however, a warm up for 10 minutes is required for 
satisfying complete performance described in the data 
sheet.

• With  voltage  output,  do  not  leave  the  output  terminals 

shortcircuited for a long time.  The unit is designed to en-
dure it without breakdown, however, it may shorten ap-
propriate life duration.

18 (.71)

49 (1.93)

1 2 3 4 5 6 7 8 9

15161718

22212019

36353433

0.5 (.02) 0.3 (.01)

0.5 (.02)

14 (.55)

14 (.55)

5.5 (.22)

20.32 (.80)

13.97 (.55) 7.62 (.30)

2.54 (.10)

1.27 (.05)

19.25 (.76)

SPAN

ZERO

TERMINAL CONNECTIONS

 EXTERNAL DIMENSIONS mm (inch) 

 TERMINAL ASSIGNMENTS 

+

+

OUTPUT

+16V

COM   (0V)

–16V

9

8

15

16

7

1

2

3

5

20

19

+

EXCITATION

*

1

INPUT 

POWER SUPPLY

*

To be used in the printed wiring board on which the unit is mounted.

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