CWE GSM-3 Manuale utente

GSM-3

3-Channel Programmable Gas Mixer

©CWE 2023

Read instructions carefully before operating this device.



This device is not to be used for Human Life Support applications.



To avoid possible electrical shock, do not operate this device if is wet or has had

liquids spilled onto it.



Service or calibration procedures should only be performed by qualified

personnel familiar with the electrical hazards of line-powered devices.

Ardmore PA 19003 U.S.A.

(610)642-7719

[email protected]

Instruction Manual

www.cwe-inc.com

GSM-3 Gas Mixer Instruction Manual 2

STATEMENT OF WARRANTY

IF THIS INSTRUMENT FAILS WITHIN A PERIOD OF ONE YEAR FROM THE DATE OF

DELIVERY OR INSTALLATION, CWE, INC. WILL, AT ITS OPTION, REPAIR OR REPLACE IT

FREE OF CHARGE TO THE PURCHASER. THIS WARRANTY EXCLUDES DAMAGE

INCURRED THROUGH ABUSE OR ACCIDENT AND CONSUMABLE ITEMS OR

COMPONENTS SUCH AS BATTERIES. CWE, INC. DOES NOT ASSUME ANY LIABILITY FOR

ANY CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OR MISUSE OF THIS

INSTRUMENT. THIS WARRANTY IS APPLICABLE ONLY TO THE ORIGINAL PURCHASER

OF THE INSTRUMENT, AND IS NON-TRANSFERRABLE.

IF YOU HAVE A PROBLEM

Please call or write describing your problem. We can often identify what is wrong, and suggest a

solution without recourse to returning the device. Defective units under warranty should be

returned to the factory along with a note describing the nature of the fault. Every effort will be

made to ensure prompt repair or replacement of the device.

FACTORY SERVICE

Out of warranty or damaged instruments may be returned to the factory postage prepaid for

service at prevailing rates. Upon request, a written or verbal quotation for such service will be

issued after examination of the unit but prior to commencing repairs or service. Address requests

for service or technical information to:

CWE, Incorporated

Technical Support Department

[email protected]m

TEL (610)642-7719

LIFE SUPPORT POLICY

Instruments manufactured by CWE, Incorporated are not authorized for use as critical

components in humanlife support devices or systems. "Life support devices or systems", as used

herein, are devices or systems whose failure to perform, whether through misuse, failure, or

proper operation, can reasonably be expected to result in significant injury to the operator or

subject persons.

USER INFORMATION:

Base Unit Serial Number: _______________

Calibration gas: Channel A________, Channel B________, Channel C________

Flow ranges: Channel A________, Channel B________, Channel C________

GSM-CommVS Software version: __________________

Gas correction factors (see Note): enabled_____ not used_____

NOTE: If gas correction factors (K-Factors) are not used, this indicates the flow controllers for each channel are

pre-calibrated with a specific gas for the highest accuracy.

This document last updated May 26, 2023

GSM-3 Gas Mixer Instruction Manual 3

TABLE OF CONTENTS

1.0 QUICK START GUIDE..............................................................................................4

2.0 INTRODUCTION.......................................................................................................6

3.0 SETUP......................................................................................................................7

4.0 OPERATION.............................................................................................................7

4.1 CREATING A GAS MIXTURE...................................................................................8

4.2 NOTES ON GAS MIXTURES ...................................................................................8

4.3 INDICATOR LIGHTS.................................................................................................9

4.4 IMMEDIATE ACTION CONTROLS.........................................................................10

4.5 LOCAL / REMOTE SWITCH...................................................................................10

5.0 REAR PANEL CONNECTIONS..............................................................................10

6.0 GAS SUPPLY ERROR DETECTION......................................................................11

7.0 CALIBRATION USING CORRECTION FACTORS.................................................11

8.0 SPECIFICATIONS ..................................................................................................13

9.0 GAS CHARACTERISTICS......................................................................................14

10.0 GSM-CommVS SOFTWARE ................................................................................15

11.0 Appendix A: GSM-3 Communication protocols.....................................................19

12.0 Appendix B: Disabling the Gas Source Alarm Function ........................................21

Figure 1: GSM-3 Gas Mixer front panel...............................................................................6

Figure 2: GSM-3 LCD panel...............................................................................................7

Figure 3: LCD panel showing alarm condition ...................................................................11

Figure 4: GSM-CommVS screen........................................................................................15

Figure 5: Gas selection drop-down menu...........................................................................16

Figure 6: Timed experiment setup .....................................................................................18

Figure 7: GSM-3 Alarm PCB showing Jumper locations......................................................21

GSM-3 Gas Mixer Instruction Manual 4

1.0 QUICK START GUIDE

This section provides a short guide to setting up and operating the GSM-3 Gas

Mixer. A more detailed description will be found in later sections of this instruction

manual.

Equipment set-up: Place the GSM-3 in a convenient location. If a computer is to

be used for remotely controlling the GSM-3, it should be

located nearby.

Connect the tubing: Connect the compressed gas sources to the gas inlets on the

rear panel. Note that these are “one-touch” press-in tubing

connectors. The gas outlet supplies the mixed gas.

Connect the cables: Connect the serial port cable between your computer and the

and the GSM-3 rear panel connector. If your computer does

not have a serial port, use the supplied USB-Serial adapter.

Install the software: Insert the GSM-CommVS CD in your computer. If the install

program does not auto-start, select run, then browse to

setup.exe on the CD. Follow the instructions to install the

program.

Start GSM-COMMVS: From the start menu, choose programs, and locate GSM-

CommVS. Select it to run the program.

Select config file: A dialog box will open asking you to select a configuration file.

Select default.txt to select a generic configuration file, or

cancel to go directly to the main screen.

Configure COM port: At the bottom of the GSM-CommVS window, set your Comm

port. Many computers will use the default COM1, but yours

may be different. The program will not work if the correct

COM port is not selected!

Set flow ranges: If not already displaying the channel flow ranges (bottom right

of screen), enter them now.

Power up the GSM-3: Turn on the GSM-3 power. After a few introductory

messages, the LCD will display the main screen. Select

LOCAL if you want to begin making settings from the front

panel, or REMOTE if you want to set up the GSM-3 from your

computer.

Ready to go! Using either the front panel controls (local mode) or the

GSM-CommVS software, select the gasses you have

connected to the inlets. Adjust the percentages for each

and set the total flow desired.

 Configurations: The GSM-3 allows you to store up to four mixtures, which can

be immediately accessed using the stored mixture knob. The

GSM-CommVS software similarly allows setting up four

mixtures. These sets of mixtures can be saved as

configuration files. Use the configuration menu at the top of

the screen to save or load these files.

GSM-3 Gas Mixer Instruction Manual 5

 Save on exit: Use the exit pushbutton on the screen to close the program.

A dialog box will open, asking you to save a configuration file.

Select an existing file, or create a new one, or select cancel to

exit without saving a configuration file.

 Operating tips: Give your configuration files meaningful names to allow easy

retrieval and use in the future. A few sample files are included

as examples.

GSM-3 Gas Mixer Instruction Manual 6

2.0 INTRODUCTION

The GSM-3 Gas Mixer allows you to easily create accurate, custom gas blends

using up to three different gasses. All parameters (gas type, percent of each gas in

the output mixture, and total flow) can be set using the front panel controls, or can

be set using the provided GSM-CommVS software. The instrument automatically

corrects for different gas densities and other properties when setting the mass flow

controllers.

A typical application of the GSM-3 is to generate gas mixes for hypoxia,

hypercapnia, or other respiratory gas challenge studies. Because these studies

often involve a low concentration of one gas relative to the other gas components,

one GSM-3 flow channel normally uses a different range flow controller. A typical

configuration might be as follows (your instrument may be different):

Note: Each GSM-3 is customized to the user’s requirements

with the appropriate mass flow controllers installed (see page 2

for your configuration). Examples shown in this manual will

probably differ from yours.

Channel:

Nominal Range

Usable Range

GAS 1

0 –10,000 ml/min

250 –10,000 ml/min

GAS 2

0 –10,000 ml/min

250 –10,000 ml/min

GAS 3

0 –1000 ml/min

20 –1000 ml/min

For the best mixture accuracy, any of the channels should be set within the usable

range shown above.

The GSM-CommVS software provided allows the user to save any number of pre-

set configurations for later use. These mixtures can then be downloaded and run on

the GSM-3 itself.

Figure 1: GSM-3 Gas Mixer front panel

GSM-3 Gas Mixer Instruction Manual 7

3.0 SETUP

Setting up the GSM-3 Gas Mixer is straightforward. The following instructions

assume that a computer with a standard serial port is available.

1. Install the GSM-3 Gas Mixer in a location convenient to the gas sources, and

near the computer that will be used with it. The unit can be rack mounted if

desired.

2. Connect your pressurized gasses to the GAS 1, GAS 2, and GAS 3ports on the rear

panel. These ports require 0.25” (6.35mm) O.D. semi-flexible tubing, which

makes a press-fit connection. To disconnect any of the tubing connections, press

in on the outer ring of the connector and pull out the tubing. Gas pressures

should be in the range of 20 - 75 psi (1.4 –5 bar).

Note: Most GSM-3’s will be configured for specific gasses,

which must be connected to the appropriate inlet.

3. Connect the GAS OUTLET port using the same type tubing, or use one of the hose-

barb adapters included with the system.

4. Connect the supplied serial port cable from your computer to the 9-pin female

RS232 port on the rear of the GSM-3. If your computer does not have a serial

port, install and use the supplied USB-Serial adapter. This adapter will create a

virtual COM port, whose COM number can be located at: Control Panel /

System / Device Manager /Ports (COM & LPT) / USB-Serial COM4

(typical, but your COM port number may be different).

5. Install the GSM-CommVS software on your PC. Insert the CD in your computer,

and run Setup.exe. We recommend accepting the default directories. The

program will then be installed in: C:\Program files\GSMComm.

6. When the GSM-3 is turned on, select LOCAL to set up the instrument from the

front panel, or REMOTE to use the GSM-CommVS software. Be sure to set the

COM port to the actual port used on your computer.

4.0 OPERATION

The instructions below describe the procedure for setting up gas mixtures and

running them from the instrument itself. The operation of the GSM-CommVS

software is described later.

Figure 2: GSM-3 LCD panel

GSM-3 Gas Mixer Instruction Manual 8

4.1 CREATING A GAS MIXTURE

Be sure the LOCAL /REMOTE switch is set to LOCAL.

Up to four custom gas mixtures can be created and stored in the GSM-3. To create,

edit, or run any of these, use the STORED MIXTURE knob. When any of the stored

mixtures is selected, its current settings will be displayed on the LCD panel.

Selecting gasses –Using the GAS SELECT knob, select either A, B, or C. While

holding the SELECT GAS /SET %switch in the SELECT GAS position, rotate the ADJUST

knob until the desired gas is shown on the display. Perform this procedure to set

gasses A, B, and C.

Note: Most GSM-3’s will be configured for specific gasses for

each of the three channels.

Setting gas percentages –Each gas can be set to anywhere in the 0 –100%

range, with 0.1% resolution. The total should add up to 100%, or the flows will be

inaccurate. The ERROR light will turn on and stay on until the gas fractions add up to

100 percent. To set a percentage, first point to A, B, or C using the GAS SELECT

knob. While holding the SELECT GAS /SET %switch in the SET %position, rotate the

ADJUST knob until the desired percentage is shown on the display. Repeat for the

other gasses. Remember that the total should add up to 100%!

Setting flow –The GSM-3 allows you to set the total flow of the mixture only.

Individual gas flows are computed and shown on the display, but the user cannot

change these directly.

To set the total flow, rotate the SELECT GAS knob to the TOTAL FLOW position. Use

the ADJUST knob to set the flow, which will be displayed on the LCD panel.

Storing the mixture -- After a mixture is configured, press the EXECUTE pushbutton,

which will store the mixture and start it running. Press the SHUT OFF FLOW

pushbutton to stop the flow. The mixture is now stored in non-volatile memory, and

will be available even if the instrument has been turned off, and then on again.

The four stored mixtures can be created and stored as described above, and can be

selected and executed any time the instrument is used.

4.2 NOTES ON GAS MIXTURES

No flowmeter or flow controller is “ideal”; i.e., it does not operate linearly over a

zero –full scale range. The range of operation is known as the turndown ratio. This

is simply the ratio of full-scale to minimum usable range. In the case of the GSM-3

controllers, this turndown ratio is approximately 50:1. For example, a 1000sccm

(standard cc/minute) controller can accurately operate over a 20 –1000sccm range.

The practical result of this information is that all possible combinations of mixtures

and flows may not be accurate if any of the gas channels fall outside of the usable

range for that channel. If any of the computed flows falls below the minimum usable

flow, the TOTAL FLOW should be increased to raise the channel flow above the

usable lower limit. The following example illustrates this condition:

GSM-3 Gas Mixer Instruction Manual 9

Desired flow mixture, total flow = 1000 ml/min, initial settings:

Channel

Percent of mix

Computed channel flow

GAS 1 (O2)

21.0%

210 ml/min (bad!)

GAS 2 (N2)

78.0%

780 ml/min (good)

GAS 3 (CO2)

1.0%

10 ml/min (bad!)

The flows for GAS 1and GAS 3fall below the minimum (250 and 20 ml/min,

respectively). To obtain an accurate mixture, increase the total flow to move these

individual flows into the usable ranges:

Total flow increased to 2000 ml/min:

Channel

Percent of mix

Computed channel flow

GAS 1 (O2)

21.0%

420 ml/min (good)

GAS 2 (N2)

78.0%

1560 ml/min (good)

GAS 3 (CO2)

1.0%

20 ml/min (good)

If very low flows are routinely required, the GSM-3 can be retro-fitted with flow

controllers for different ranges. Please contact the factory for details.

4.3 INDICATOR LIGHTS

The various indicator lights give important information about the operation of the

GSM-3 Gas Mixer.

Active Mixture lights –These four red LED’s indicate which mixture is currently

selected by remaining steadily on. A blinking ACTIVE MIXTURE led indicates that a

particular mixture is currently running (flow is being delivered). Even while one

mixture is running, the STORED MIXTURE knob can be used to select another mixture

for configuration. In this case, one of the LED’s will be blinking (that mixture is

running), and another is steadily on (indicating that that mixture is being displayed

for editing, etc.).

Running light –This green led will turn on when gas is actually flowing; i.e., a

mixture is currently running.

Error light –This red led will indicate setup errors, such as when the gas

percentages do not add up to 100%.

This will also light when a gas source error is detected (see section 6.0).

GSM-3 Gas Mixer Instruction Manual 10

4.4 IMMEDIATE ACTION CONTROLS

As described above, the EXECUTE pushbutton will immediately cause the currently

selected mixture to run. Conversely, pressing the SHUT OFF FLOW pushbutton will

immediately shut off the flow controllers.

4.5 LOCAL / REMOTE SWITCH

Set this switch to LOCAL to perform gas mixture setup and execution from the

GSM-3 front panel. Set this switch to REMOTE to use the GSM-CommVS software to

remotely control the instrument. Note that in remote mode, the ACTIVE MIXTURE

LED’s are not automatically on, indicating that the STORED MIXTURE switch setting is

ignored, since this function is performed by the software.

5.0 REAR PANEL CONNECTIONS

Gas Inlets –These ports are used to connect any of the three inlet gasses. The

connectors are compatible with ¼” OD semi-flexible tubing (urethane or similar).

Press in the outer ring of the connector to withdraw the tubing.

Gas Outlet –This port provides the gas mixture created by the GSM-3.

Fuse –In case this fuse blows, replace it with one of the same current and voltage

rating as the original. If the fuse blows repeatedly, the instrument should be

returned for service.

Serial Port –The RS232 serial port uses a standard 9-pin D-sub connection. This

port should be connected to your computer using a straight-wired cable (not a

crossover or modem cable). Use the supplied USB-Serial adapter if a true serial

port is not available.

Analog Outputs –These BNC jacks provide an analog voltage corresponding to

the flow rate of each of the three gasses in the current gas mixture.

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