Thermo Scientific RO-20 Operating Manual Download | Manualshive

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1-6 RB-XXX-XXXXXX

E RO-20

Löw 08.10.2008

1.4.7.5

Weight

Approximately 3.6 pounds (1.63 kg) with alkaline AA cells.

1.4.7.6

Size

4.2 in. wide

x

7.9 in. long

x

7.7 in. high (10.7 cm

x

20.1 cm

x

19.6 cm), including handle.

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Summary of Contents for RO-20

Page 1: ...Operating Manual RF 000 xxxxxx RO 20 AA Ion Chamber ...

Page 2: ......

Page 3: ...F 0 1 REVISIONS SHEET Rev Rev Dept Name Rev Cat Explanation State resp page Category C editorial correction I clearing improvement A substantial amendment Explanations must be given at least with Category A ...

Page 4: ...neral Specifications 1 4 1 4 1 Ranges Five linear ranges 1 4 1 4 2 Meter 1 4 1 4 3 Response Time 1 4 1 4 4 Linearity 1 4 1 4 5 Controls 1 4 1 4 5 1 External 1 4 1 4 5 2 Internal 1 5 1 4 6 Batteries 1 5 1 4 7 Environment 1 5 1 4 7 1 Temperature 1 5 1 4 7 2 Temperature Compensation 1 5 1 4 7 3 Moisture 1 5 1 4 7 4 Humidity 1 5 1 4 7 5 Weight 1 6 1 4 7 6 Size 1 6 2 Operation 2 1 2 1 Description of Co...

Page 5: ...c Circuitry 2 2 3 Theory of Operation 3 1 3 1 General Theory 3 1 3 2 Functional Theory 3 2 3 2 1 Ion Chamber 3 2 3 2 2 The Circuit 3 3 4 Maintenance 4 1 4 1 Preventive Maintenance 4 1 4 1 1 Batteries 4 1 4 1 2 Desiccant 4 2 4 1 3 Calibration 4 2 4 1 4 Circuit Checks 4 3 4 1 5 Disassembly 4 3 4 1 6 Reassembly 4 5 4 1 7 Troubleshooting 4 7 5 Appendix A Electronics and Parts List 5 1 ...

Page 6: ... 2 4 Table 5 1 RO 20 Electronics and Parts 5 1 WEEE Compliance This product is required to comply with the European Union s Waste Electrical Electronic Equip ment WEEE Directive 2002 96 EC It is marked with the following symbol Thermo Electron has contracted with one or more recycling disposal companies in each EU Member State and this product should be disposed of or recycled through them Further...

Page 7: ...γ and x ray radiation The RO 20 has five linear ranges of operation to measure exposure rate for x ray and gamma radiation The ion chamber is vented to atmospheric pressure The RO 20 is calibrated to γ radiation 137 Cs A single rotary Function Switch turns the instrument off provides battery checks checks the Zero setting and selects the range of operation Figure 1 1 Model RO 20 Ion Chamber ...

Page 8: ...etector Specifications 1 3 1 Size 2 84 inch inside diam 13 4 in3 volume 7 21 cm diam 220 cm3 1 3 2 Fill Air vented to atmospheric pressure 1 3 3 Wall 0 20 in 0 51 cm conductive plastic approximately 640 mg cm2 inside 0 063 in wall aluminum case making approximately 1000 mg cm2 total thickness 1 3 4 Window Two layers one on the chamber one on the can 0 001 in 25 micron mylar approximately 7 mg cm2 ...

Page 9: ...h the closed slide facing the source 15 from 55 keV to 1 3 MeV through the side of the instrument 1 3 8 Examples of Beta Response Uranium slab 30 of true mrad h field behind 7 mg cm2 window with the RO 20 resting on the slab slide open 90 Sr 90 Y Approximately 93 of true mrad h field at 30 cm with slide open 1 3 9 Fast Neutron Response PuBe Reads approximately 8 in mR h of true neutron field in mr...

Page 10: ...scale Battery Dependence Within 5 The reading is independent of battery voltage when the battery check indications are in the green arc In order to achieve but linearity in the 50R h Range it is recommended to exchange the 3 ea 12 Volt batteries indicated by Battery 2 once the needle falls below 4 0 1 4 5 Controls 1 4 5 1 External Function Switch with Off Zero and Battery checking positions The Ze...

Page 11: ...d allow for at least 50 000 five second battery checks The battery drain is negligible on all other positions of the Function Switch Note Frequent or continuous use of the light will reduce battery life significantly 1 4 7 Environment 1 4 7 1 Temperature Operable from 40 F to 140 F 40 C to 60 C For operation below 0 F 18 C alkaline or nickel metal hydride AA cells should be used 1 4 7 2 Temperatur...

Page 12: ...RB XXX XXXXXX E RO 20 Löw 08 10 2008 1 4 7 5 Weight Approximately 3 6 pounds 1 63 kg with alkaline AA cells 1 4 7 6 Size 4 2 in wide x 7 9 in long x 7 7 in high 10 7 cm x 20 1 cm x 19 6 cm including handle ...

Page 13: ...diation field strengths measurable by the RO 20 can cause personal injury in a short time Before using the instrument check Battery 1 AA cells and Battery 2 l2V alkaline cells The meter should indicate in the green Battery Check arc Do not leave the Function Switch in the Battery 2 position for an extended period Turn the Function Switch to the Zero position Check that the meter reads 0 If not set...

Page 14: ... and sides of the RO 20 Because the ion chamber is vented to the atmosphere it is sensitive to changes in atmospheric pres sure Table 2 1 and Table 2 2 give correction factors to be applied if the RO 20 is used at an elevation other than the elevation at which it was calibrated Normal atmospheric pressure variations at one lo cation are small enough to be ignored The chamber output signal is fully...

Page 15: ... 0 77 0 74 3000 1 12 1 08 1 04 1 0 96 0 93 0 89 0 86 0 83 0 80 0 77 4000 1 16 1 12 1 08 1 04 1 0 96 0 93 0 89 0 86 0 83 0 80 5000 1 20 1 16 1 12 1 08 1 04 1 0 96 0 93 0 89 0 86 0 83 6000 1 25 1 20 1 16 1 12 1 08 1 04 1 0 96 0 93 0 89 0 86 7000 1 30 1 25 1 20 1 16 1 12 1 08 1 04 1 0 96 0 93 0 89 8000 1 35 1 30 1 25 1 21 1 16 1 12 1 08 1 04 1 0 96 0 93 9000 1 40 1 35 1 30 1 25 1 21 1 16 1 12 1 08 1 ...

Page 16: ...81 0 78 0 76 1250 1 16 1 13 1 10 1 06 1 03 1 0 97 0 94 0 91 0 89 0 86 0 83 0 81 0 78 1500 1 20 1 16 1 13 1 10 1 06 1 03 1 0 97 0 94 0 91 0 89 0 86 0 83 0 81 1750 1 24 1 20 1 16 1 13 1 10 1 06 1 03 1 0 97 0 94 0 91 0 89 0 86 0 83 2000 1 28 1 24 1 20 1 16 1 13 1 10 1 06 1 03 1 0 97 0 94 0 91 0 89 0 86 2250 1 32 1 28 1 24 1 20 1 16 1 13 1 10 1 06 1 03 1 0 97 0 94 0 91 0 89 2500 1 36 1 32 1 28 1 24 1 ...

Page 17: ... the amplifier output which is connected to the feedback elements through a temperature compensating divider circuit The feedback elements are connected to the amplifier input and to the ion chamber and they conduct away all of the current generated in the ion chamber The second amplifier stage which is fed from the first amplifier drives the meter through calibrating adjustable resistors The gain...

Page 18: ...ded feedthrough is positioned on insulators between the center conductor and the outer ring to prevent leakage from the chamber voltage to the center electrode The guard ring and center electrode are maintained at the same common potential to prevent leakage from the guard to the electrode The chamber is sealed but vented through a plastic tube to a silica gel desiccant package A small hole connec...

Page 19: ... of the chamber structure is maintained at chassis potential but the center electrode disk and all the remaining circuitry is biased at 36 volts relative to the chassis Three 12 V alkaline batteries provides this voltage Except for insulation leakage and the very few microamps taken during battery check the alkaline battery 3ea 12V is essentially open circuited and will last indefinitely 3 2 2 The...

Page 20: ...ge has a separate calibration control an adjustable resistor in series with the second stage output This circuit then feeds the meter directly through the Function Switch The Zero Knob provides a slight voltage offset adjustment to the input of the first stage of A101 The amplifiers are DC coupled and this adjustment is reflected at the meter Component A203 is a 5 volt regulator whose output is co...

Page 21: ...o hold the relay coils at common potential whenever the relays are not actuated helping reduce leakage currents when using the mR h ranges Amplifier A201 5 6 7 provides a slow reduction of relay coil current when switching to the mR h ranges in order to minimize transients ...

Page 22: ......

Page 23: ...e performing the procedures described in this chapter Figure 4 1 Interior View RO 20 4 1 1 Batteries Replace the AA cells when Battery 1 check indicates near the left end of the meter s green arc Replace the 12V alkaline batteries when Battery 2 check indicates the needle is left 4 in the meter s green arc ...

Page 24: ...he crystals begin to turn clear or pink in color Slip the hose from the fitting on the old desiccant pack and onto the new one The used silica gel crystals can be repeatedly dried by heating them to 250 F 120 C for 12 hours or to 400 F 205 C for one hour Keep dried crystals in tightly sealed containers until ready for use The snap on cap of the desiccant package has a small hole in it to allow the...

Page 25: ...ield strengths required for calibration of the RO 20 can cause personal injury in a short time Use safe procedures 4 1 4 Circuit Checks Flip the light switch in both directions and observe that the lamps are functional Select Battery 1 position on the Function Switch and measure the voltage of the AA cells The meter should indicate battery voltage multiplied by 0 6 within 5 Select Battery 2 positi...

Page 26: ...the chamber circuit to the chamber body or damage to the components may result To remove the small battery connector board from the chamber 1 Remove the two screws and gently pull the board from the chamber 2 As soon as the cable connector can be reached hold it and unplug it from the connector board Handle the cable gently 3 Remove the board To remove the center electrode disk from the chamber 1 ...

Page 27: ...cover 2 Remove the Knob from the Function Switch and remove the nut from the switch bushing 3 Remove the two screws from the long standoffs at the front of the board and pull the cover and the board apart The light switch pins will slip out of the connector To remove the meter 1 Unsolder the wires from it 2 Remove the two nuts and washers and remove the two long hexagon shaped spacers at the front...

Page 28: ...rew in the guarded feedthrough from the top of the chamber assembly 2 Press the three nylon shoulder washers into the holes in the chamber plate The widest washer diameter must be on the chamber side 3 Insert the three screws from inside the chamber up through the nylon washers Hold them in place 4 Place the insulating disk over the three screws 5 Place the metal cup over the three screws Make sur...

Page 29: ... way for air insulation If substituting new amplifiers does not solve the problem then track the circuit functions to find the fault Several components connect to the point in the circuit where the extremely small ion chamber current flows It is of the utmost importance that they be clean free of fingerprints and carefully installed They include Pin 2 of A101 the two feedback resistors R101 and R1...

Page 30: ...4 8 RB XXX XXXXXX E RO 20 Löw 08 10 2008 ...

Page 31: ...Ro 20 RB XXX XXXXXX E 4 9 Löw 08 10 2008 Figure 4 2 General schematic ...

Page 32: ......

Page 33: ...20 Electronics and Parts Part No Description 5 ALKALINE AA SIZE BATTERIES 3 ALKALINE 12V BATTERIES FOR CHAMBER BIAS SF 11546501 1 PCB POWER SUPPLY UNIT RO 20 HDKN25 RANGE KNOB HDKN4 ZERO KNOB ICAOALMC662 DUAL MOS INPUT LMC662AIN MMRU7 RUBBER FEET MTPA35 METER ASSEMBLY REHV151G3X 1 5X10 11 150G OHM 5 REHV158B2X 1 5X10 9 1 5G OHM 5 RLRD1 READ SWITCH SWRO57 RO20 ROTORY SWITCH SWTO39 TOGGLE SWITCH VEC...

Page 34: ...008 YX11502001 RO20 CAN ASSEMBLY WITH NO CAL HOLE ZP10448011 HANDLE POWDERCOATED ZP10894010 RO 20 ZERO KNOB GUARD ZP11498003 RO20 COVER PAINTED w o OVERLAY ZP11498012 GASKET COVER RO 20 ZP11498014 COVER OVERLAY RO 20 ZP11502004 RO 20 SLIDE ...

Page 35: ...Meßnetzprogramm NetView RF 019 950313 Schl Ff 13 03 1995 SACHWORT REGISTER ...

Page 36: ......

Page 37: ...o Electron Erlangen GmbH Radiation Measurement Security Frauenauracher Straße 96 Postfach P O Box 16 60 D 91056 Erlangen Germany D 91051 Erlangen Germany www thermo com 49 0 9131 998 0 info rmp erlangen thermofisher com 49 0 9131 998 475 fax ...

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