CWE GSM-3 Instruction Manual
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CWE GSM-3 Instruction Manual

3-channel programmable gas mixer
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Instruction Manual
GSM-3
3-Channel Programmable Gas Mixer
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
info@cwe-inc.com
©CWE 2023
www.cwe-inc.com

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Summary of Contents for CWE GSM-3

  • Page 1 Instruction Manual GSM-3 3-Channel Programmable Gas Mixer 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.
  • Page 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...

  • Page 3: Table Of Contents

    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 © 2023 CWE, Inc.

  • Page 4: Quick Start Guide

    GSM-3 Gas Mixer Instruction Manual 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.
  • Page 5 GSM-3 Gas Mixer Instruction Manual  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.

  • Page 6: Introduction

    GSM-3 Gas Mixer Instruction Manual 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.

  • Page 7: Setup

    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...

  • Page 8: Creating A Gas Mixture

    LOCAL REMOTE 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 knob. When any of the stored STORED MIXTURE mixtures is selected, its current settings will be displayed on the LCD panel.

  • Page 9: Indicator Lights

    GAS 3 (CO 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.

  • Page 10: Immediate Action Controls

    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.

  • Page 11: Gas Supply Error Detection

    OUTPUT allowing for the response time of the flow controllers. If a gas supply to any of the three channels is disrupted (e.g., a gas tank runs out), the GSM-3 will detect this as an alarm condition. Note: In cases where one or more channels are deliberately not connected or used, no error will be detected.
  • Page 12 ADJUST KNOB change. The GSM-3 will re-start, and apply the new K-factor. 8. After re-starting, the previously run test gas mixture should be displayed. Run it, and note the output gas concentration. If the concentration still needs...

  • Page 13: Specifications

    GSM-3 Gas Mixer Instruction Manual 8.0 SPECIFICATIONS Flow controller type ............thermal mass flow controllers Linearity (0 - 100%) ................... +1% Repeatability and hysteresis ................ +0.15% Long-term stability ....+0.2% full scale / 7500 hours continuous operation Response time ................<1 second, typical Operating temperature ..................

  • Page 14: Gas Characteristics

    These correction factors are automatically applied when different gasses are used with the GSM-3 Gas Mixer. In case your gas is not one of those programmed into the instrument, you can choose among the pre-programmed gasses one that has similar characteristics to your gas.

  • Page 15: Gsm-Commvs Software

    Figure 4: GSM-CommVS screen The GSM-CommVS software provided with the GSM-3 system is used to remotely control the instrument. All the functions available on the front panel of the GSM-3 can be performed using this software. In addition, multiple configuration files can be easily created and saved to disk on the computer for later use, and automated timed switching of gas mixtures can be performed..
  • Page 16 GSM-3 Gas Mixer Instruction Manual Set flow ranges – Enter the flow ranges of the installed flow controllers in your instrument in the three labeled text boxes near the bottom right of the main screen. These values are saved with any mixture configuration setting files (see below), and are automatically re-entered whenever a configuration file is loaded.
  • Page 17 Note that these buttons execute the program currently stored on the GSM-3 in the corresponding location (Mix 1 – 4). Therefore, if the GSM-3 has been previously configured with stored programs, these will be run (which may be different from those shown on the software screen).
  • Page 18 GSM-3 Gas Mixer Instruction Manual Timed experiments – An important and useful feature of the GSM-CommVS software is the ability to run pre-programmed, timed experiments. Figure 6: Timed experiment setup panel allows a timed sequence of gas mixtures to be delivered, and SEQUENCER either repeated indefinitely, or terminated after one sequence has completed.

  • Page 19: Appendix A: Gsm-3 Communication Protocols

    GSM-3 Gas Mixer Instruction Manual 11.0 Appendix A: GSM-3 Communication protocols The GSM-CommVS software communicates with the GSM-3 Gas Mixer hardware via the serial protocol described below. This description is provided in case the user wants to develop his own custom control software using, for example, Labview or Visual Basic.
  • Page 20 GSM-3 Gas Mixer Instruction Manual The example program in the table below would set up the GSM-3 to do: Mix position #1, gas1 = oxygen, %gas1 = 20.9, gas2 = carbon dioxide, %gas2 = 0.1, gas3 = nitrogen, %gas3 = 79.0, total mix flow = 1000 ml/min...

  • Page 21: Appendix B: Disabling The Gas Source Alarm Function

    3. Place Jumpers on positions 1, 2, and 3 as shown by arrows below. Leave the 4 pair of pins uncovered. 4. Replace the top cover and reconnect the power cord. Figure 7: GSM-3 Alarm PCB showing Jumper locations. Left: Default, Alarm enabled; Right: Alarm disabled © 2023 CWE, Inc.

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