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OPERATION/MAINTENANCE MANUAL

PORTABLE TRITIUM MONITOR

MODEL RS400-HTO

with Alkaline Battery Option

OVERHOFF TECHNOLOGY CORPORATION

1160 US ROUTE 50, MILFORD, OHIO, USA

Содержание RS400-HTO

Страница 1: ...OPERATION MAINTENANCE MANUAL PORTABLE TRITIUM MONITOR MODEL RS400 HTO with Alkaline Battery Option OVERHOFF TECHNOLOGY CORPORATION 1160 US ROUTE 50 MILFORD OHIO USA ...

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Страница 3: ...m the monitor if the monitor is to be stored for long periods x This instrument has not been designed for indiscriminate opening or disassembly of the internal parts The bias voltage batteries are always connected to the ionization chamber cans even when the instrument is switched OFF The electronics contains highly sensitive semiconductors which are destroyed by even the slightest electrostatic d...

Страница 4: ...AINTENANCE 12 8 0 SERVICE 13 9 0 WARRANTY 13 10 0 REPLACEABLE PARTS 14 FIGURE 1 FRONT PANEL CONTROLS 15 FIGURE 2 HOSE BARB CONNECTION 16 FIGURE 3 OUTPUT CONNECTIONS 17 DRAWING J2 OUTPUT CABLE DRAWING FUNCTIONAL BLOCK DIAGRAM DRAWING GENERAL ARRANGEMENT MODEL RS400 HTO WITH OPTIONAL ALKALINE BATTERIES WIRING DIAGRAM MODEL RS400 HTO WITH OPTIONAL FOR ALAKINE BATTERIES ...

Страница 5: ...eries although operating duration maybe vary Onset of battery depletion is signaled by illumination of an LED located next to the meter face An external power supply can be used by attaching to a small receptacle the side of the instrument case The same LED also signals red when the high voltage power supply HVPS used for ionization chamber bias has a malfunction DO NOT SUBSTITUTE use only the rec...

Страница 6: ...less warm up ALARM ACOUSTIC 1 ten position stepped attenuator set point for signal alarm 2 to 1 000 μSv hr steady tone OFF position included 2 low flow produces an intermittent tone 3 Mute switch silences audible tone ALARM VISUAL LEVEL red LED when tritium level exceeds set point FLOW yellow flashing LED low pump flow LOW BAT red LED D cell batteries need to be replaced AND HVPS red LED illuminat...

Страница 7: ...meter long cable for RS232 serial data Mini DIN plug for J2 output connector at one end with DB9 plug for serial connection on other end Power converter 100 240 VAC 50 60 Hz 25 A to 3 3 Vdc 1 2 A 5 5 mm O D x 2 1 mm I D Plug Center pin is positive DO NOT SUBSTITUTE use only the recommended power supply ADDITIONAL ACCESSORY ITEMS FOR RS400 HTO VERSION 2 each desiccant column for HT HTO measurement ...

Страница 8: ...rrent contribution from external gamma radiation In the RS400 instruments the four ionization chambers are arrayed in a cruciform pattern ensuring almost perfect gamma compensation in all directions and even for high gradient non uniform fields The ionization chamber polarizing voltage is supplied by an electronic high voltage power supply The surfaces of the ionization chambers have a thin coat o...

Страница 9: ...itium contamination of the chambers or otherwise A front panel control has been provided for adjustment of the set point level at which the acoustic alarm is desired to sound The acoustic signaler has the second function of alerting the user that sample gas flow is impeded All power supplies are regulated A warning LED on the front panel will illuminate red when the battery terminal voltage has dr...

Страница 10: ...lumbing hose attachments is selected to suit the mode in use FIRST MODE refer to Figure 2 Measures total tritium plus any noble gases when present A sniffer hose is attached to a small in line dust filter which is directly attached to the IN hose barb The other measurement chamber hose barb is routed to the inlet of the pump by means of a short piece of hose Connecting a short loop of hose to each...

Страница 11: ...osition Now the pump is operating and the low flow indication will be eliminated If it is desired to operate the instrument continuously on an external power supply only a source of 3 3VDC 1 2 3A current capacity should be used Attaching the external power plug will automatically disconnect the D cell batteries NOTE If the audible alarm is an intermittent tone sample flow through the chambers is b...

Страница 12: ... or excessive grounding may actually enhance the potential of danger and disturb the proper internal operation of the instrument The electronic circuitry including logic adjustment controls local and remote displays are centrally and all inclusively grounded at the ionization chamber module The circuit system common line is electrically connected to the metal frame or housing of the electrometer m...

Страница 13: ...trated below There are eight fields with single spaces between the fields The data string is terminated with r n The data string appears as shown below followed by an explanation of each field A0F1 000421 uSv h 004199 L0H0 0090 1 10 00000523 Field 1 A0F1 start character A Alarm high tritium alarm 0 no alarm or 1 alarm F Flow Alarm 0 flow is OK or 1 low flow blocked filter bad pump or blockage Fiel...

Страница 14: ...s rather then cancels and a known gamma field should produce a predetermined measurement indication 6 2 GAS CALIBRATION Since the instrument is essentially linear a relatively high concentration can be used for most accurate results Values between 100 1 000 μSv hr are convenient but any other values from 20 5 000 μSv hr can be used The manufacturer of the gas calibrator generally provides instruct...

Страница 15: ...on potentiometer with a small screwdriver The calibration potentiometer is accessed by removing the small Phillips head screw on the front panel located above the label CAL Large changes in calibration are evidence of malfunction The factory should be consulted immediately OVERHOFF TECHNOLOGY CORPORATION Telephone 513 248 2400 Facsimile 513 248 2402 Email support overhoff com 6 4 GAMMA CHECK If a ...

Страница 16: ...commend a low intensity gamma check source of the type which is commonly intended for G M counters or other survey instruments For example a 10 micro Curie Cesium 137 check source should be sufficient for a monitor reading of 100 200 μSv hr IMPORTANT Do not adjust the calibration when performing a gamma check Manipulate the alarm set point to verify correct functioning of the alarm If the instrume...

Страница 17: ...out proper precaution Special training can be given to qualified technical personnel who are entrusted with instrument service and repair responsibility Warranty is void if maintenance or repair other than that which is listed in this manual is performed by an unauthorized repair facility OVERHOFF TECHNOLOGY CORPORATION Telephone 513 248 2400 Facsimile 513 248 2402 Email support overhoff com 9 0 W...

Страница 18: ...Barb Sample Outlet Brass P N 230 4 2 Panel Meter P N DMO 742W AC power converter P N KTPS05 03315U VI P1 Input 100 240 VAC 47 63Hz 0 25A Output 3 3 Vdc 1 2A Output Plug 5 5 mm O D x 2 1 mm I D Plug Center pin is positive DO NOT SUBSTITUTE use only the recommended power supply Fuse 2 Ampere P N MDL 2 RS232 Cable P N J2 RS400 2M 2 3 meter length cable is standard a maximum length of 15 meters is ava...

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