External calibration of the leak detector
Contents
1. 0 03x 25 20 x 1 O 02x2 1x108 mbarl s Reminder 1 PPM 1 0x10 concentration Example container with 100 PPM helium mixture 2 possibilities enter target value 1 0 E 02 to display the test result in PPM enter target value 1 0 E O4 to display the test result in helium concentration 100 PPM 100 x10 1x10 6 6 Alcatel Vacuum Technology France ASM 182 TD ASM 192 T2D User s Manual GB 00262 Edition 03 September 012. 3 j I TARGET VALUE 1 0E 08 OK gt PRESS NEXT ig CYCLE IN PROGRESS mavroca ED oe B INLET E IE NEXT Target value m n hard vacuum test mode possible case determination The target value is the value of an external calibrated leak connected to the installation to test or at the inlet port of the leak detector gt Case A m In sniffing test mode 2 possible cases the target value is the value of an external calibrated leak gt Case A Ifa container or installation is filled with a known gas mixture including Helium it is possible to enter helium concentration as a target value Case B Alcatel Vacuum Technology France ASM 182 TD ASM 192 T2D User s Manual 5 6 Case A Case B C73 External calibration of the leak detector VVhen an external calibrated leak is used it is recommended to take into account date of calibration and temperature effect for calculating the target value from the calibrated leak value as shown on its identification label HELIUM CALIBRATED LEAK Helium leak rate 1 0x10 8 mbar I s at 20 C Date of calibration 10 Dec 1997 loss per year 2 increase per C 3 Example of calibrated leak label indications as listed here If the date is 1 Dec 1999 about 2 years after calibration and calibrated leak ambient temperature is 25 C Target value 1 0x O8x
3. GB 00262 Edition 03 September 01 Purpose of the external calibration C73 External calibration of the leak detector In some instances it may be convenient to display a helium leak value so that matches a desired target value typically the value of an external calibrated leak connected to the installation to test or at the inlet port of the leak detector E In hard vacuum test mode gt when the measurement range is very different from the value of the internal calibrated leak E In sniffing test mode when a specific calibration is required in the sniffing test mode to certify that the measurement is valid and accurate E In hard vacuum or sniffing test mode gt when the leak detector is connected to an installation ha ving its own pumping system in operation and a small amount of the leak goes into the leak detector The external calibration allows to get a direct readout of the current leak value gt when the helium signal needs to be displayed in a different unit for convenience or to calibrate the leak detector if the internal calibrated leak is temporary unavailable manual auto calibration selected The external calibration is provided for the operator to easily obtain a direct readout of the target value or current external leak thanks to a correction factor automatically calculated and applied to the digital display of the leak detector Alcatel Vacuum Technology France ASM 182 TD AS
4. M 192 T2D User s Manual 16 External calibrated leak Recalibration Digital and analog display External calibration procedure External calibration cancellation C73 External calibration of the leak detector An external calibrated leak defined in accordance to your own requirements is required for the external calibration procedure 8 Accessories BF A70 It is recommended to have every calibrated leak recalibrated at regular intervals to validate its value 8 Accessories B A70 When the external calibration is performed the digital display will show a connected value Then will come on to reflect it The analog display is not connected and therefore both values might be different The external calibration should always be performed only when the leak detector is already auto calibrated internally The external calibration procedure is performed in 2 steps m step selection of the test mode m 2 step adjustment of the target value These 2 steps are explained in below paragraphs At any time operator can cancel external calibration procedure COR RESET 2 6 Alcatel Vacuum Technology France ASM 182 TD ASM 192 T2D User s Manual GB 00262 Edition 03 September 01 GB 00262 Edition 03 September 01 C73 External calibration of the leak detector 1 step Reminder Operating principle of the control panel 3 C 20 Selection of the hy pies tie ley yx activate
5. d test mode N Note External calibration should be performed in the test mode used by the operator if operator uses the both test modes hard vacuum and sniffing he should performed one external calibration for each test mode The external calibrated leak is connected to the inlet port of the leak detector or at a suitable location of the installation to test CYCLE IN PROGRESS Emi MODE ii IET INLET ea TEST AUTO CAL EN EXTERNAL CALIBRATION NEXT MODE gross leak A EM TARGET VALUE 1 0E 07 OK gt PRESS NEXT Iy COR Fi EXTERNAL CALIBRATION FQ Oo ail MODE fae I or EM TARGET VALUE 1 02 07 OK gt PRESS NEXT Ig Alcatel Vacuum Technology France ASM 182 TD ASM 192 T2D User s Manual 3 6 2 step Adjustment of the target value About sniffing test mode C73 External calibration of the leak detector The target value is the desired value to be displayed on the digital display at the end of the auto calibration The target value adjustment procedure is the same in hard vacuum and sniffing test mode The target value can be memorized following 2 methods E the operator enters directly the target value see below paragraph E the target value is automatically calculated by the leak detector ES C 74 In sniffing test mode the calibration can be p
6. erformed with E the ambient atmosphere E an external calibrated leak E a container or installation at atmospheric X pressure filled with a known gas mixture including Helium The sniffer probe will be exposed to one of the 3 items listed above 3 one represents the most reliable and accurate way of calibrating a leak detector in sniffing mode The 1 and 2 ones are the most common and practical methods Before using one of the 2 methods Connect the sniffer probe to eal READY FoR cycus 2 the sniffer port of the leak TET Te detector STDBY E SNIFFER Ly EXTERNAL CALIBRATION MODE sniffing Ea ETI TARGET VALUE 1 0E 08 Mm OK gt PRESS NEXT I Please use after chosen method 4 6 Alcatel Vacuum Technology France ASM 182 TD ASM 192 T2D User s Manual GB 00262 Edition 03 September 01 GB 00262 Edition 03 September 01 C73 External calibration of the leak detector Enter target value EMM EXTERNAL CALIBRATION MODE seis EBM TARGET VALUE 1 0E 07 2d OK gt PRESS NEXT ce EXTERNAL CALIBRATION Fa UC EN mone DM TARGET VALUE 1 0E 07 AN OK gt PRESS NEXT Iy i EXTERNAL CALIBRATION Adjust target value E Rae amme D TARGET VALUE 1 0E 08 AN OK gt PRESS NEXT i 2 8 Adjustment of a value BA C 20 F3 E EXTERNAL CALIBRATION MODE IE F
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