M-system MDK-LC Instruction Manual Download Page 1

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:

Lightning surge protector ...................................................(1)

 

MODEL NO.

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

 

INSTALLATION / INSTRUCTION MANUAL

This manual describes necessary points of caution when 
you use this product, including installation, and basic main-
tenance procedure.

LIMITATION APPLICABLE TO M-RESTER

The M-RESTER will protect electronics equipment from 
damage caused by lightning by absorbing most of the 
surge voltages.
However, M-RESTER may not be effective against cer-
tain extremely high voltages caused by a direct or almost 
direct hit by lightning.
M-RESTER must be installed according to this installa-
tion / instruction manual.

GENERAL

 

FUNCTION & FEATURES

• Specifically designed to protect strain gauge transmitters 

from lightning surge damage that enters on the wiring 
between the strain gauge and the transmitter

• Absorbs surges only without affecting transmitted sig-

nals.

 

SPECIFICATIONS

OUTPUT SIDE EXC. SIDE

LINE TO GND

Discharge voltage

±0.3V min.

15V min.

±15V min.

Max. surge voltage* ±15V max.

30V max.

±30V max.

Response time

≤5 nsec.

Discharge current 
capacity

100A

 (8/20 µsec.)

50A

(8/20 µsec.)

50A

(8/20 µsec.)

Leakage current

≤0.2µA

@±0.3V DC

≤0.2µA

 @15V DC

≤0.2µA

@±15V DC

Maximum voltage

±0.3V

15V

–––

Int. series resist.

≤0.1Ω

*The maximum voltage that could pass through M-RESTER. 
Protected equipment must be able to withstand this voltage 
for a very short time period.

POINTS OF CAUTION

 

ENVIRONMENT

• When heavy dust or metal particles are present in the at-

mosphere, install M-RESTER inside proper housing and 
ventilate it.

• Do not install the M-RESTER where it is subjected to 

continuous vibration. Do not apply physical impact to the 
M-RESTER.

• Environmental temperature must be within -5 to +55°C 

(23 to 131°F) and relative humidity within 30 – 90% RH 
in order to ensure adequate life span and operation.

 

DIELECTRIC STRENGTH TEST

• The unit will start discharging when 15V or greater volt-

age is applied bewteen lines and ground. DO NOT per-
form dielectric strength tests with wires connected to the 
unit.

 

AND ....

• We recommend that you keep spare M-RESTERs so that 

you can replace them when necessary.

• Lightning surge can enter not only through signal lines 

but also through power supply lines. We recommend that 
you also use the Lightning Arrester for Power Lines for 
sufficient protection.

COMPONENT IDENTIFICATION

Body

Specification

Label

Connection

Diagram Label

LIGHTNING SURGE PROTECTOR FOR STRAIN GAUGE USE

MODEL

MDK-LC

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201  Fax: +81(6)6659-8510  E-mail: [email protected]

EM-8136  Rev.4  P. 1 / 3

INSTRUCTION MANUAL

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