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- Page 1 InstruTech, Inc. CVM-211 " " " " Convection Vacuum Gauge Module User’s Manual Revision: 1.05 Sept 25 2007 1475 S. Fordham St. Longmont, CO 80503 Phone 303-651-0551 Fax 303-678-1754 E-mail info@instrutechinc.com www.instrutechinc.com...
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Page 2: Table Of Contents
Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Table of Contents page Introduction / General Information Description Specifications Options & Accessories Safety General Service & Operation Electrical Grounding Overpressure Gases other than N Flammable/Explosive Gases Installation Mechanical Position Vibrations... -
Page 3: Introduction / General Information
2 of this manual to make sure you have ordered the appropriate model for your use. A built-in display provides a convenient user interface for setup and operation of the vacuum gauge. This manual applies to InstruTech CVM-211 series modules. -
Page 4: Safety
InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Safety Instrutech has designed and tested this product to provide safe and reliable service, provided it is installed and operated within the strict safety guidelines provided in this manual. Please read and follow all warnings and instructions. -
Page 5: Gases Other Than
Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Gases other than Nitrogen: InstruTech gauges and modules are calibrated for N . Do not attempt to use with other gases such as argon or unless accurate conversion data for N to the other gas is properly used. -
Page 6: Electrical
A good recommended practice is to remove power from any cable prior to connecting or disconnecting it. ® The InstruTech CVM-211 will directly replace GP Mini-Convectron modules that have a 9-pin D connector, and you can use your existing cables and electronics. -
Page 7: Setup & Operation
Setting up the CVM-211 Stinger Module 1. With the CVM-211 in the normal pressure display mode, press and hold <select> for 3 seconds. 2. The readout displays the value of the 'setpoint turn-on’ pressure. The relay energizes when pressure drops below this value. -
Page 8: Service Calibration
Service Calibration Every InstruTech module is calibrated prior to shipment using Nitrogen. However, you can adjust the zero and span, using the procedure described above. Zero and span settings affect the displayed value and the output signal. Care should be exercised when using gases other than nitrogen N - See Appendix B for more information. -
Page 9: Module & Gauge Replacement
The CVM module is factory calibrated for the specific gauge tube installed in it. Since each gauge tube and module calibration is different, the gauge cannot be replaced. If the gauge fails for any reason, the CVM-211 module must be replaced. Given the low cost of a new CVM-211 module, it is generally considered an expendable item. - Page 10 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Appendix A: CVM-211 User Interface Map Map Normal pressure display To enter setup mode, press and hold <select> for 3 seconds. Readout displays value of "setpoint turn-on" pressure. (Relay energizes when pressure is below this value.) [Factory default = 100 mTorr.] To keep this value and go to next step, To change this value, use <up>...
- Page 11 Log-Linear Analog Output Log-Linear Analog Output Log-Linear Output Many InstruTech modules and controllers also provide a log- Output - Volts Output - Volts linear output signal, as an alternative to the non-linear signal described above. This output, shown at right, is a 1 Volt per decade signal that may be easier to use for data logging or control.
- Page 12 Other considerations when using gases other than N Flammable or explosive gases: InstruTech CV gauges and modules are not intrinsically safe or explosion proof, and are not intended for the measurement, or use in the presence, of flammable or explosive gases or vapors.
- Page 13 The X-Axis is the pressure reading indicated by the convection gauge under test. ® The chart shows readings for an InstruTech CVG as well as for a GP Convectron gauge, to illustrate that the response of the gauges to these different gases is virtually indistinguishable. (Caution: Do not assume this data applies to other convection gauges, which may or may not be the same.)
- Page 14 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Table 1 - Non-Linear Analog Output Voltage vs Pressure, for Selected Gases The following Stinger part numbers ending with the letter “A” provide a Non-Linear Analog output: CVM211GAA, CVM211GBA to…CVM211GHA . Refer to next page if you have ordered a Stinger with a Log-Linear Analog output.
- Page 15 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Table 2 - Log-Linear Analog Output Voltage vs Pressure, for Selected Gases The following Stinger part numbers ending with the letter “L” provide a Non-Linear Analog output: CVM211GAL,CVM211GBL to…CVM211GHL. True Pressure...
- Page 16 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Log-Linear Analog Output Voltage vs Pressure 0.0001 0.001 0.01 1000 Pressure (Torr) This is a plot of the formulas and data for the log-linear output signal, from the previous page. InstruTech, Inc...
- Page 17 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Table 3 - Displayed Pressure Readings vs Pressure, for Selected Gases True Total Freon12 Freon22 Pressure mTorr mTorr mTorr mTorr mTorr mTorr mTorr mTorr 10.0 11.0 14.7 13.5 12.1 15.3 mTorr 20.0...
- Page 18 Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module The most common cause of all vacuum gauge failures is contamination of the sensor. Noisy or erratic readings, the inability to set zero or atmosphere, and total gauge failure, are all possible indications of gauge contamination.
- Page 19 More commonly, particles in the process chamber are swept into the gauge during the vent cycle. InstruTech gauges have a screen built into the gauge port, to help keep the largest particles out of the gauge. In very dirty applications, or where particles are small enough to get through the screen, an additional filter installed on the inlet may help prolong gauge life further.
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Page 20: Warranty
Instruction Manual InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module Warranty SELLER warrants that its products, are free of defects in workmanship and material and fit for the uses set forth in SELLER's catalog or product specifications, under the normal use and service for which they are intended.