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Summary of Contents for Granville-Phillips 270001 004
- Page 1 .. . � 1 H S D ENGINEERING INC. 10828 BANCROFT AVE. OAKLAND,CA 94603 SERIES 270 IONIZATION GAUGE CONTROLLER INSTRUCTION MANUAL GRANVILLE-PHILLIPS (G1�...
- Page 2 MANUAL AS IT PERTAINS TO YOUR PARTICULAR INSTRUMENT BEFORE YOU AffiMPT TO INSTALL OR USE YOUR INSTRUMENT. This manual is to be used only with the following Series 270 Controller part numbers. See Section 1.3 for part number explanations. 270001 004 270019 003 270045 101 270056 100...
- Page 3 LIMITED WARRANTY This Granville-Phillips Company product is warranted against defects in materials and workmanship for one year from the date of shipment provided the installation and preventive maintenance procedures specified in this instruction manual have been followed. Granville...
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Page 4: Table Of Contents
PAGE SECTION Emission Control Emission Sensing Amplifier '· 5- 3 Electrometer Circuit Pressure Amplifier ,-•· Autoranging 5.10 IG Process Control 5.11 -� Thermocouple Circuit 5.12 Thermocouple Process Control Maintenance General Information Guidelines for Troubleshooting 6- 3 Input Power Problems Power Supply Problems Filament Turn on and Emission Problems 6- 7 Electrometer Circuit... -
Page 5: General Information
I ½1 inch taut band ruggedized meters. Recorder outputs are also provided for each of the thermocouple circuit s. The thermocouple circuitry is designed to operate with Granville-Phillips 70006 or comparable transducers. Thermocouple process controls, when included, provide an individual SPOT relay contact set point for each thermocouple gauge. - Page 6 < ' I) 0 to -2.4V corresponding to front panel meter Recorder Output, Ion Gau ge • Output impedance indication of Oto 12 x I 0- is 2 Kohm. 2) 0 to -5V corresponding to IV /decade of pressure. Output impedance is 2 Kohms. Recorder Output, Thermocouple 0 to 2V corresponding to 0 to I Torr to 1.33...
- Page 7 ' ' • SECTION II INSPECTION 2. I Receiving Inspection Prior to using your controller for the first time, remove tJ:ie two screws of the upper corners of the rear panel and take off the top cover. Visually inspect the unit for shipment damage.
- Page 8 This procedure uses a conventional Volt-Ohm Meter (VOM) and Resistor (10 ohm, 10 watt) With the gauge controller turned off, test for both DC and AC voltages between the metal parts of the vacuum chamber and the gauge controller chassis. If no voltages exist, measure resistance.
- Page 9 Figure 3-2 shows the configuration the tube elements must have if the tube is to mate directly to a standard cable assembly. Granville-Phillips catalog numbers 270007, 270008 and 270040 are standard cable assemblies with tube connection as shown in Fig.
- Page 11 Units of Measure Selection, Ion Gauge The ion gauge is capable of providing direct readout in Torr, mbar and Pascal units. To switch units, refer to Fig. 3-5 for proper location of the jumper plug. The jumper plug is located on the main printed circuit board directly behind the ion gauge panel meter (see Fig. 6-1 ).
- Page 12 SECTION IV OPERATION INSTRUCTIONS It is desirable to read these instructions if full use is to be made of the many NOTE: features designed into this controller. Purpose of Controls (Left to right) (Refer to Fig. 4-1) ·· Power Switch - Supplies power to the entire unit when switch is placed in the on position.
- Page 13 Complete the previous section on thermocouple zero. Rotate the TC t/2 set pot full CCW. Place the filament switch in the prese t position if auto filament control is to be u sed. Set the system pressure for the desired trip point� Slowly rotate the TC 112 set pot CW until the filament light turns on and/or the t/2 process relay energizes.
- Page 14 IG Set Point Adjust (power on) Rotate the set point pot fully CCW. Allow pressure in the system to stabilize at the desired control point. Slowly rotate the pot CW until the process relay energizes. The process control relays on the ionization gauge are interlocked in the following manner: Operation i s only possible when the autorange switch i s i n the on position.
- Page 15 For example, if your tube has a sensitivity of 25/Torr, then the meter reading during calibration to make the controller direct reading is: 10/Torr Meter reading ::: x 10 25/Torr To set the emission current, proceed as follows. Establish the necessary meter reading as described in the previous section.
- Page 16 The controller is capable of supplying rated filament power to a tube with up to a 40 foot gauge cable. A longer cable can be used if the filament and grid wire size is increased to maintain a line resistance of less than .06 ohms per lead. Consult Granville-Phillips for long cables.
- Page 17 SECTION V THEORY OF OPERATION General Theory of Operation of Ion Gauge Tube and Controller FILAMENT GRID FIG. 5-1 SCHEMA TIC OF COMMON IG TUBE The pressure indication of a Bayard-Alpert gauge is based on the ionization of gas molecules by a constant flow of electrons. The functional parts of the gauge, shown schematically in Fig.
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Page 18: Emission Control
Fi lament On-Off (Refer to Fig. 5-4) Transistor Ql4 and filament relay K3 control the power to the filament. During manual operation the base of Ql4 is turned on by the +I0V signal applied from C7 when the filament switch is momentarily toggled to the on/off position. This energizes K3 establishing a holding path through R2 6 and R24. -
Page 19: Pressure Amplifier
IC6-A and IC6-B are voltage comparators having as their inputs a voltage corresponding to the desired set point and the output of the pressure amplifier. When the pressure is lower than the set points selected the amplifier switches from positive saturation to negative saturation turning on the relay driver transistor and energizing the relay. -
Page 20: Guidelines For Troubleshooting
If the prescribed remedies do not correct the troubles, or if additional assistance or special parts are required, contact the Technical Service Department, Granville-Phillips Company, 5675 East Arapahoe Avenue, Boulder, Colorado, 80303. Telephone: 303-443-7660. -
Page 21: Input Power Problems
"')) 6.3 Input Power Problems Cure Problem Possible Cause Power light wi II not light (all Power cord not plugged in. Plug in power cord. functions inoperative.) Refer to Fig. 5 -3 . No power to receptacle. Restore power to receptacle. Controller fuse FI blown. -
Page 22: Electrometer Circuit
Problem Possible Cause Cure IC 10-A or associated component Troubleshoot and repair defective. Using an oscilloscope, verify that the waveform present on pin I of IC I 0-A is as shown on Fig. 5-4 when the filament light is on. Verify that the waveform present Troubleshoot and repair as at the junction of R33 and CI O is as... - Page 23 . ,..._,J ❖I� Possible Causes Cure Problem Gauge tube filament turns on as Shorted triac S CR I, Fig. 5-4. Apply lace triac. soon as ac power is turned on. a short from gate to anode I (across C23). Filament light is not on. Filament glows very brightly indicating high emission current.
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Page 24: Autoranging
- 'j ,,<-'- " -',� ..� ·,-:.} ·· • Cure Problem Possible Causes Manual or autoranging only Defective up range comparator IC7-B T roub I eshoo t and repair. operates in down-range direction. or associated comparator defective. Check voltage at test point D for 0V de when the manual switch is depressed to the up position. -
Page 25: Thermocouple Process Control
· • . l .-:::- ,� . ·:,:) �' Problem Possible Causes Cure Defective op amp or associated circuit Troubleshoot and repair. component. Check that the amplifier has a D C gain of 200. Eout 0 mV 2V de 5 mV IV de 10 mV OV de... - Page 26 ··•:·. < ·-- ·, ._/.., �3 ..� -� •'144 C>\27 . --:--:.. [ 1 , 3 � cJ= - h- � � c � � □ C,:/31 L____ � = " . ' I f" 1 , p n �, �;...
- Page 27 t>l, M ain Circuit Board Parts List (R efer to Fig. 6-1) Cir cuit G-P Part N umber D esi gnation Description Integrated Circuits IC I thru IC4 Quad 2-input nand 4011 UB 004697 101 Binary up/ dn counter 45 I 6B 004696 100 IC6 thru IC8 Dual Operational amp MC l458, Motorola...
- Page 29 . Cir cuit G-P Part Number De s ignation Description Resistors and Potentiometers Resistor 10 Kohm 5.0% 5.0W 004780 100 Resistor 510 Kohm 5.0% 0.5W 005691 001 Resistor 200 ohm 5.0% 0.5W 004773 100 Resistor 500 ohm 5.0% 5.0W 004781 100 004773 100 Resistor 200 ohm 5.0% 0.5W .
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Page 31: Ig Process Control
+12v ✓ R13 7.SK SWITCH DECADE SWITCH SWITCH EOUJVALENT NOTES TO EMISSJON -··1 1. ALL RESISTORS IN OHMS. ,SW ,5% CONTROL UULESS OTHERWISE NOTED 100K 10" JC2·C TO AUTORANGING 2. RESISTOR ARRAYS (RA TYPES) 118W +12V RA1-1 22K DENOTES SIGNAL GROUND R? 61,'l I{ 1% DENOTES CHASSIS GROUND lO M... - Page 33 )> "Tl (./') )> '° ---J TO ELECTAOMETER AUTOAANGING >:::� ..◄. - IC 8 OFF f EMISSION CONTROL : IC10-A · b, ·23V C 12 .01,IJF @! , . , J3· 13&P J3·15&S 100K 5K 20% • PROCESS J3· 14&R DELAY PROCESS CONTROL AA7·5...
- Page 34 ,- ----------------- --------------------------------------------� :7 6 - ;, ,-----------------------------------------------------------➔ .r&-J �,TQ ·7 ,- ---------------------------- -- --------- - --------- - - - ---- ➔ J&•H � ' TC. # 2 Z.£1'<0 .7 6 - L ,..,..., RAJO-S T,1. ---------~v-_.=.vU\.-= '----"-fiJ\,--..�J'--4•&:, r;;;,_ , 1 1 '"...
- Page 35 ..., r--11) > ::; --"- - -Wl----1 1,,, � /_ rJ / t, Zi \ I• t:! --'\ FIG. 5-8 THERMOCOUPLE SCHEMATIC 004973 103 5-12...
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