vacuubrand DCP 3000 Instructions For Use Manual

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vacuubrand DCP 3000 Instructions For Use Manual Manual pdf 30 page image

page 30 of 36Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefullythe validity of this document with respect to his product. Manual-no.: 999162 // 19/01/2011Instead of adjustment under vacuum to a pressure < 0.1 mbar,adjustment to a precisely known reference pressure withinthe range of 0 ..... 20 mbar is possible. Evacuate the pressuretransducer VSK 3000 to a pressure within 0 ..... 20 mbar➨ In function ”Configuration” select the menu item ”Adjust-ment”.☞ The reading is automatically adjusted to ”zero”.➨ Use the selection knob to adjust the reading to the refer-ence pressure at the vacuum connection within the rangeof 0 ..... 20 mbar.➨ Press the selection knob to confirm.Note: The accuracy of the value of the reference pressure will directly affect the accuracy of the adjust-ment. If the nominal ultimate vacuum of a diaphragm pump is used as reference vacuum, the accuracyof the device might be doubtful. The diaphragm pump may not achieve the specified value (due to con-densate, poor condition, failure of valves or diaphragm, leaks).The pressure transducer VSK 3000 was adjusted using factory standards, which aretraceable through regular calibration in an accredited laboratory (German Calibrationservice) to the German national pressure standard. Depending on the process and/or on accuracy requirements, check the adjustment and readjust if necessary. Forreadjustment, the device has to be adjusted both at atmospheric pressure as wellas under vacuum. For readjustment the reference pressures have to be known pre-cisely. In the range between 20 and 700 mbar no adjustment is possible; ---- mbaris displayed.Adjustment at atmospheric pressureAn adjustment at atmospheric pressure is only possible if thepressure is higher than 700 mbar.Ventilate the pressure transducer VSK 3000 and/or the vac-uum system. Make sure that the vacuum connection at theVSK 3000 is at atmospheric pressure.➨ In function ”Configuration” select the menu item ”Adjust-ment”.➨ Use the selection knob to adjust the reading to the actualatmospheric pressure.➨ Press the selection knob to confirm.Note: To determine the actual atmospheric pressure, use an accurate barometer or get accurate read-ing from the weather service, the next airport, etc. (take into account the difference in altitude betweene. g. airport and laboratory).Adjustment under vacuumAn adjustment under vacuum is only possible if the pressureis lower than 20 mbar.Evacuate the pressure transducer VSK 3000 to a pressure< 0.1 mbar (e. g. by applying a good two-stage rotary vanepump).➨ In function ”Configuration” select the menu item ”Adjust-ment”.☞ The reading is automatically adjusted to ”zero”.➨ Press the selection knob to confirm.Note: Adjustment under vacuum with an actual pressure higher than 0.1 mbar reduces the accuracy ofthe measurement. If the pressure is significantly higher than 0.1 mbar, adjustment to a reference pres-sure is recommended.Adjustment at a reference pressure1013 mbar0 mbar0...20 mbarReadjustment of pressure transducer VSK 3000NOTICE