READ THE INSTRUCTION MANUAL BEFORE USINGSPECIFICATIONS,INSTRUCTION MANUALGAS MIXER
GMX-SD001

No. TR-GMX-SD001-E02

1-2-3,Nishi-shiriike-cho,Nagata-ku,Kobe,Hyogo 653-0031 JAPANTEL. +81-78-631-6000 FAX. +81-78-631-6020

Table of Contents
Page

Introduction ........................................................................................................................................ 1
I. Precautions .................................................................................................................................... 1
II. Specifications .............................................................................................................................. 2
III. Names of Components ......................................................................................................... 3
IV. Installation
1. Use environment ................................................................................................................. 3
2. Installation location ............................................................................................................ 3
3. Piping........................................................................................................................................ 3

V. Operation
1. Start of operation ............................................................................................................... 4
2. Stop and resume of operation....................................................................................... 4
3. Completion of operation .................................................................................................. 4

VI. Accessories ................................................................................................................................ 5VII. Periodic inspection ............................................................................................................... 6VIII. Product Warranty ................................................................................................................. 6Outline ................................................................................................................................................... 7

Introduction
Thank you for purchasing the Gas Mixer GMX-SD001.

△！

CAUTIONFor your safety- Please read this instruction manual beforehand to use the product safely and correctly.
Misuse may cause failure and lead to damage or accidents.
- Please keep this instruction manual nearby so that it can be referenced by workers wheneverneeded.

I. Precautions△WARNING！

- This device is intended for mixing Ar gas and CO2 gas.
DO NOT use any type of gas other than the Ar gas or CO2 gas or liquids.
- DO NOT use oxygen gas.
This device is not oil free. Use of oxygen gas may cause ignition.
- DO NOT use any combustible, flammable, corrosive, or toxic gas.
- DO NOT apply pressure exceeding the withstand pressure.
The maximum withstand pressure of this device is 0.5 MPa. If the pressure exceeds the limit, the diaphragm inthe pressure control section is damaged and may result in injury or disaster, such as an accident.
- DO NOT use the device in locations exposed to high vibration or shock.
Doing so may cause performance degradation or failure and may result in injury or disaster.
- DO NOT disassemble or modify the device.
Doing so may not only invalidate the warranties but also cause performance degradation or failure and may
result in injury or disaster.
- DO NOT use the device in locations exposed to rainwater, etc.
This device is not waterproofed. If it is exposed to rainwater, etc., it may lead to injury or disaster.
- DO NOT turn the pressure control knob located inside the device.
Doing so will change the settings for the scales of flow volume and mixture ratio disabling correct operation.

△CAUTION！

- This device shall be installed in horizontal orientation.
Place the bottom of the device horizontally to prevent it from affecting the accuracy of mixture ratio.
- Securely perform installation and piping work in accordance with the instruction manual and check that there
is no leakage of gas from joints and piping connections.
- Choose piping materials that withstand the maximum pressure applied to the use location.
- Use Ar gas and CO2 gas compliant with JIS standards described in the specifications.
If moisture contained in the gas enters and condensates inside the device, the flow volume and mixture ratio
characteristics will vary and may make it impossible to obtain the standard accuracy.
- DO NOT use the device in locations exposed to direct sunlight or strong heat source.
- DO NOT connect a buffer tank with this device.
- After completing the operation, release the internal pressure as described on page 4 section 3 “Completion ofoperation.”1II. Specifications
Product name

GMX Gas Mixer SD001 Ar+CO2

Model

GMX-SD001

UsageFor mixing shield gas for MAG welding, etc.

Features

Supported gas- Highly precise gas mixer supporting mixture ratio from 5% CO2 to 30% CO2- An optimum mixture ratio and flow volume can be obtained by just turning the knobs
to the desired positions of each scale.
- A stable supply of mixed gas is enabled without the need for a buffer tank even during
intermittent gas supply.
Ar gas, CO2 gas
Quality class
Ar : Class 2 specified in JIS K1105 or higher
CO2 : Class 1 specified in JIS K1106 or higher

Installation posture

Horizontal installation Place the bottom of the device horizontally.

Standard mixture
ratio

Ar:CO2 = 80:20

Range of scale for
mixture ratio

5% to 30% CO2

Setting accuracy of
mixture ratio±1% CO2 abs.

Range of scale forflow volume

15–25 L/min

Inlet pressure range

0.3–0.5 MPa

Inlet pressure
settingMax. withstanding
pressureAr gas and CO2 gas shall be set at the same pressure
0.5 MPa

Check valve

A check valve is mounted at the piping connections on the inlet side

Dust-proof
measures

A metal mesh (Ø0.06 × 150 mesh) is mounted at the piping connections on the inletside

Inlet joint screw

9/16-18 UNF

Outlet joint screw

9/16-18 UNF

Installation method
Accessories
External dimensions
Weight△！

CAUTION- Floor standing (using rubber feet in four corners at the bottom)- Wall mounted … A set of wall installation board (separately available) is required(See page 5)
Hose nipple for Ø1/4 (6.4 mm) for the hose 3 pcs
Cup nut (9/16-18UNF) 3 pcs
See the external drawing Y3-7400-100-01B
Approx. 4.4 kg

While ensuring gas mixture accuracy, this device does not ensure the quality of welds.
2III. Names of Components
Joint for Ar gas inlet
Joint for mixed gas outlet
Cap nut

191820 21 22231716241525

Hose nipple
Flow volume control knob

Joint for CO2 gas inlet
20152510530

Mixture ratio control knob

* The cap nut and hose nipple are included with this device.

IV. Installation
1. Use environmentA) Use this device in a well-ventilated location.
B) Do not expose it to direct sunlight or strong heat sources.
C) Do not use it in locations exposed to large vibration, shock, rainwater, etc.

△！

CAUTION

When using the device in a narrow space, be sure to sufficiently ventilate the area and install
an alarm for monitoring the reduction of oxygen concentration in the atmosphere.

2. Installation location
This device shall be installed in a horizontal orientation. Place the bottom part horizontally for use.

3. Piping
Connect piping equipment as shown in the figure below.
- Install a reducing valve, pressure gage, and inlet valve (ball valve, etc.) between both the gas supply
sources and inlet joints of this device.
- Install an outlet valve (ball valve or opening/closing valve on the welded nozzle side) after the joint for
mixed gas outlet on this device.
Main unit of GMX-SD001
Gas supply
sourcePressure gage
Joint for Ar gas inlet

Joint for mixed gas outlet

INAr gascylinderIN

CO2 gascylinder
Reducing valve

Inlet valve
Joint for CO 2 gas inlet

3

Flow volume
control valve

Pressure equalization
valve

Pressure gage

Confluence
deviceInlet valve

Mixture ratio
control valve

Reducing valve

Internal pressure controller

OUT
Outlet valve

V. Operation
1．Start of operation1) Adjustment of inlet pressure
Please adjust the inlet pressure in accordance with the following procedure.
(i) Turn the mixture ratio control knob and flow volume control knob to set them at 20% CO2 and20 L/min respectively.
(ii) Close the inlet valves for both gases and open the outlet valve.
(iii) Adjust the gas pressure of the both gas supply sources to the same pressure within the rangeof 0.3–0.5 MPa by using the reducing valve located on the inlet side.
(iv) Be sure to open the Ar gas inlet valve first, and then open the CO2 gas inlet valve.
* By following this step, it is possible to reduce the load of the rush pressure applied to thediaphragm in the pressure control section.
(v) The device discharges a mixed gas of 20% CO2 at the rate of 20 L/min.

△！

CAUTION

When mixed gas is discharged, it may change the setting pressure of the reducing valves on
the inlet side of both gases. In such a case, adjust the gas pressure of the both gas supply
sources again to the same pressure within the range of 0.3–0.5 MPa by using the reducing
valve located on the inlet side.

2) Adjustment of concentration and flow volume of mixed gasTurn the mixture ratio control knob and flow volume control knob to set concentration and flow volumeof mixed gas at the desired values. The order of adjusting the mixture ratio and flow volume is arbitrary.

△！

CAUTION

When the outlet piping is opened on this device, the flow volume scale shows the value preseton the scale by design. If the output flow volume is reduced, the actual flow volume will bedifferent from the value indicated on the scale.

2. Stop and resume of operation
To stop:
Close the mixed gas outlet valve.
To resume:
Open the mixed gas outlet valve. The device discharges mixed gas with the same mixture ratio and flow
volume as those before the stop. A stable supply of mixed gas is enabled without the need for a buffertank even during intermittent gas supply.

△！

CAUTION

DO NOT connect a buffer tank to this device.

3. Completion of operation
Release the internal pressure of this device in accordance with the following procedure.
(i) Turn the mixture ratio control knob to set the ratio at 20% CO2, and then open the mixed gas outletvalve.
* Make sure to adjust it around 20% CO2 because CO2 gas will not be discharged if it is set at 0% CO2.
(ii) Stop the supply of Ar gas and exhaust Ar gas from this device until the pressure inside the piping(iii) Stop the supply of CO2 gas and exhaust CO2 gas from this device until the pressure inside thepiping reaches 0.
(iv) Close the inlet valves for both gases and the mixed gas outlet valve to complete operation.

△！

CAUTION

If CO2 gas is exhausted first, Ar gas remaining in the device is not exhausted, which makes
the pressure source and piping of the device still pressurized.
If you exhausted CO2 gas first, supply CO2 gas again, and then exhaust both gases inaccordance with step 2 and onward.

4

VI. Accessories
Seet of wall installation board
d9.5
95
1.5

Stainnless steel [sepparately availabble]

146
126

189
169

6×φ5（hole）
4×φ8（hole）

Producct No.：BRKT
T-GMX-SD
Byy replacing thhe back board with this boaard, it is possible to install the device onn a wall surface.
Exxternal dimensions when th
he set of wall installation boardbis mounnted
Wall instaallation board

1919.5Use accesssory bolt set

169

126

10

Installation wall surfface

10Fix
x with 4 × M6 hex
xagon bolts, etc.
(not included with thiis device)△！

CCAUTION

Install on a sttrong wall surrface.

5VII. Periodic inspection
For replacement of the rubber components and gaskets, we recommend overhaul inspections at intervals of aroundevery five years.

VIII. Product Warranty
Warranty Period
The warranty period shall be for one year from the date that the product has been delivered to the location specified
by the purchaser.
Warranty Scope
In the event of any failure or defect in the product or non-conformity of specifications due to the reasons solely
attributable to Yamamoto Electric Works, Yamamoto Electric Works shall remedy such malfunctioning or defective
product at its own cost in one of the following ways to be selected by Yamamoto Electric Works:ⅰ) repair such product, ⅱ) replace such product.
However, this Warranty shall not cover the damages or defects that arise due to any of the following reasons.
(1) Any failure resulting from improper conditions, improper environments, improper handling, or improper
usage other than described in the instruction manual or the specifications arranged between thepurchaser and Yamamoto Electric Works.
(2) Any failure resulting from factors other than a defect of our product, such as the purchaser’s
equipment or the design of the purchaser’s software.
(3) Any failure resulting from modifications or repairs carried out by any person other than Yamamoto
Electric Works’ staff.
(4) Any failure caused by a factor that cannot be foreseen at a scientific/technical level at the time when
the product has been shipped from Yamamoto Electric Works.
(5) Any disaster such as fire, earthquake, and flood, or any other external factor, such as abnormal voltage,
for which we are not liable.
Yamamoto Electric Works specifically disclaims all implied warranties of merchantability and/or fitness for aparticular use or purpose, as well as liability for incidental, special, indirect, consequential or other damages
relating to the product.
*This product warranty is only valid within Japan.
Product Applicability
Our products are designed and manufactured as general-purpose products for general industries. Therefore, ourproducts are not intended for the applications below and are not applicable to them.
(1) Facilities where the product may greatly affect human life or property, such as nuclear power plants,aviation, railroads, ships, motor vehicles, or medical equipment(2) Public utilities such as electricity, gas, or water services(3) Usage outdoors, under similar conditions or in similar environments
This document has been translated from the original Japanese version, and the original Japanese version takes firstpriority.
Be sure to refer to the original Japanese for the details of this warranty.

<Prior notice>
The specifications and description of the product explained in this instruction manual may be subject to change
without prior notice because of modification and the like.

6Outline7