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Instruction Manual
GSM-4
4-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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Related Manuals for CWE GSM-4
Summary of Contents for CWE GSM-4
- Page 1 Instruction Manual GSM-4 4-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...
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Page 3: Table Of Contents
Figure 4: GSM-4 Alarm display ..........................13 Figure 5: GSM-4-CommMX Mode selection) ......................16 Figure 6: GSM-4-CommMX screen (MODE 1: Four-channel mixer mode shown) ..........17 Figure 7: Independent (MODE 2: all channel flows independently set) ..............17 Figure 8: Mimic (MODE 3: Channel 4 = Total Flow of mixture) ................18 Figure 9: Mass Flow Controller values entered for each channel. -
Page 4: Quick Start Guide
GSM-4 Gas Mixer Instruction Manual 1.0 QUICK START GUIDE This section provides a short guide to setting up and operating the GSM-4 Gas Mixer. A more detailed description will be found in later sections of this instruction manual. Equipment set-up: Place the GSM-4 in a convenient location. - Page 5 GSM-4 Gas Mixer Instruction Manual 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. © 2023 CWE, Inc.
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Page 6: Introduction
A typical application of the GSM-4 is to generate gas mixes for hypoxia, hypercapnia, or other respiratory gas studies. Because these studies often involve a low concentration of one gas relative to the other gas components, one GSM-4 flow channel normally uses a different range flow controller. A typical configuration might be as follows (your instrument may be different): Note: Each GSM-4 is customized to the user’s requirements with the... -
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-4. If your computer does not have a serial port, install and use the supplied USB-Serial adapter. This adapter will create a... -
Page 8: Operation
LOCAL REMOTE LOCAL Up to four custom gas mixtures can be created and stored in the GSM-4. 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: Notes On Gas Mixtures
– 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-4 controllers, this turndown ratio is approximately 100:1. For example, a 1000sccm (standard cc/minute) controller can accurately operate over a 10 –... -
Page 10: Indicator Lights
4.5 LOCAL / REMOTE SWITCH Set this switch to to perform gas mixture setup and execution from the LOCAL GSM-4 front panel. Set this switch to to use the GSM-4-CommMX software REMOTE to remotely control the instrument. Note that in remote mode, the ACTIVE MIXTURE led’s are not automatically on, indicating that the... -
Page 11: Rear Panel Connections
(also called K-factor) is applied to match the new gas. If K-factors are enabled on your GSM-4 system (see page 2, User Information), these corrections will be applied when you select a gas, either from the front panel or using the GSM-4-CommMX software. - Page 12 ADJUST KNOB change. The GSM-4 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...
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Page 13: Flow Alarms
GSM-4 Gas Mixer Instruction Manual 7.0 FLOW ALARMS The GSM-4 Gas Mixer is equipped with an alarm system to detect a discrepancy between the requested flow and the actual output flow from any of the four Mass Flow Controllers (MFC’s). The major trigger conditions for this alarm are: 1. -
Page 14: Specifications
GSM-4 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 15: Gas Characteristics
GSM-4 Gas Mixer Instruction Manual 9.0 GAS CHARACTERISTICS If your GSM-4 Gas Mixer has one or more channels calibrated for nitrogen, you can apply a K-factor to make it work with one of the gasses listed below. Note that these almost always reduce the accuracy as compared to a channel calibrated for a specific gas. -
Page 16: Gsm-4-Commmx Software
The software provided with the GSM-4 system is used to remotely control the Gas Mixer. All the functions available on the front panel of the GSM-4 can be performed using this software. Multiple configuration files can be easily created and saved to disk on the computer for later use, and automated timed switching, or sequencing of gas mixtures can be performed. - Page 17 GSM-4 Gas Mixer Instruction Manual Figure 6: GSM-4-CommMX screen (MODE 1: Four-channel mixer mode shown) Figure 7: Independent (MODE 2: all channel flows independently set) © 2023 CWE, Inc.
- Page 18 GSM-4 Gas Mixer Instruction Manual Figure 8: Mimic (MODE 3: Channel 4 = Total Flow of mixture) Setting the COM port – Use the COM PORT control on the screen to select the COM number of the serial port on your computer. The control will automatically be populated with the available serial ports on your computer.
- Page 19 GSM-4 Gas Mixer Instruction Manual Load and Save Configuration -- These operate as you might expect: Load configuration will retrieve from disk a set of previously stored settings; Save configuration will save the current settings to a file of your choice. You might try loading one of the pre-configured files to see how this works (e.g., the hypoxia...
- Page 20 Increase TOTAL FLOW to fix. All the percentages should add Enter the TOTAL FLOW of this up to 100%. mixture. Figure 12: Mixture configuration panel, GSM-4 mode. No FILL GAS. Each Channel is Flows are independently set independently. calculated as: Flow = percent X REF FLOW.
- Page 21 Store - Run button – Clicking any of these light-green buttons causes the selected mixture to be downloaded to the GSM-4 and immediately executed. It will be stored in the GSM-4 for later use. Each mixture must be separately downloaded.
- Page 22 GSM-4 Gas Mixer Instruction Manual left-hand box, enter the desired duration of that step in HH:MM:SS (Hours, Minutes, Seconds) format. These functions are somewhat self-explanatory; Mix 1 - 4 runs the specified mixture for the programmed time. REPEAT starts the sequence steps above this command again from the top.
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Page 23: Appendix A: Gsm-4 Communication Protocols
Labview or Visual Basic. In addition, the file format of the configuration files used by the GSM-4- CommMXprogram is described. These text files can be easily created using Notepad or any text editor. - Page 24 Notes: Gas identification number is the same as in the table in Section 7.0. For example, oxygen = 3. Configuration file format: This is the file format used by the GSM-4-CommMX program to save and load configuration data. Note that this is a simple text (ASCII) string of numbers, with comma delimiting.
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