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Summary of Contents for overhoff 200SB-HTO
- Page 1 OPERATION/MAINTENANCE MANUAL PORTABLE TRITIUM MONITOR MODEL 200SB-HTO OVERHOFF TECHNOLOGY CORPORATION 1160 US ROUTE 50, MILFORD, OHIO, USA...
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Page 2: Table Of Contents
8.0. Service 9.0. Replaceable Parts 10.0. Warranty Figure 1 – Front Panel Controls Figure 2 – Hose Barb Connections Figure 3 – Functional Block Diagram Drawing, Model 200SB-HTO General Arrangement Drawing, Model 200SB-HTO Chamber Position Drawing 1020686, Ionization Chamber Can... -
Page 3: Introduction
The instrument will measure tritium in its elemental form. 1.1. PHYSICAL DESCRIPTION Model 200SB-HTO uses two identical ionization chambers in a side by side arrangement. One ionization chamber, with a total volume of 200 cc, is used for measurement, the second chamber serves for gamma compensation. -
Page 4: Technical Specifications
2.0. TECHNICAL SPECIFICATIONS MEASUREMENT DISPLAY 4 1/2 digit LCD 0.1 - 1999.9 MBq/m GAMMA COMPENSATION two chambers in a side by side arrangement RESPONSE RATE 20 seconds to reach 90 % of final reading, NOISE LEVEL +0.1 MBq/m , 1 S.D. (5 second electronic time constant) ZERO STABILITY after 1 minute (or less) warm up, the zero drift... -
Page 5: Circuit Description
3.0. CIRCUIT DESCRIPTION CAUTION: This instrument has not been designed for indiscriminate opening or disassembly of the internal parts. It contains highly sensitive semiconductors which are destroyed by even the slightest electrostatic discharge. 3.1. IONIZATION CHAMBERS In its simplest form, an ionization chamber is an enclosed volume with two electrodes. Voltage is applied between the electrodes, generating an electric field which will segregate and collect electric charges which are created by nuclear events occurring inside the chambers. -
Page 6: Signal Processing Amplifier
3.3. SIGNAL PROCESSING AMPLIFIER A single printed circuit board attached directly to the front face of the instrument contains all power supply and signal processing electronics. Proprietary circuitry is used for the recognition and elimination of transient signals due to radon or high energy cosmic ray pulses. -
Page 7: Configuration
4.0. CONFIGURATION 4.1. EXTERNAL FEATURES The front panel features include: 1. the digital panel meter, 0.1 - 1999.9 MBq/m 2. function control knob 3. alarm level control knob, 0.2 - 100 MBq/m 4. low battery LED 5. signal level alarm LED 6. -
Page 8: Operation
5.0. OPERATION Ensure that a dust filter is connected in line ahead of this instrument flow inlet in use. The following steps are necessary and sufficient to operate the instrument: 1. Set measurement alarm level to desired value. 2. Rotate mode switch to the MEASURE position. Allow one minute or less for the instrument to stabilize. -
Page 9: Calibration
6.0. CALIBRATION 6.1. METHOD Tritium monitors employing ionization chambers, such as Model 200SB may be calibrated with either of two methods. The first method consists of injecting a known activity of tritium gas; the second method uses external gamma radiation of a known field strength. To ensure trace ability to National Standards, the first method must be employed. -
Page 10: Gamma Calibration
6.3. GAMMA CALIBRATION If the unit has previously been calibrated with tritium gas, then it is sufficient to use a small check source to any type of gamma radiation to produce a response when placed at a specified location relative to the instrument under test. If the check source is long lived, no chronological correction is needed. -
Page 11: Maintenance
7.0. MAINTENANCE Very little maintenance is required for Model 200SB tritium monitors, but some periodic attention may be necessary, especially if the instrument is to be used in adverse environments. The batteries should be replaced within half an hour when the low battery light illuminates. Access to the batteries is made by twisting off the caps located on the front panel of the instrument. -
Page 12: Service
8.0. SERVICE This instrument contains components that are easily destroyed if the case is opened and handled without proper precaution. Overnight service is provided by the factory. Special training can be given to qualified technical personnel who are entrusted with instrument service and repair responsibility. -
Page 13: Replaceable Parts
9.0. REPLACEABLE PARTS The following parts and components are disposable items and may be obtained from Overhoff Technology Corporation or from any original supplier: Batteries, primary power "D” size, alkaline, EN95 Batteries, polarizing 45 V, No. 415 Dust filter Pall No. 12082 Dust Filter Clip Clic No. -
Page 14: Warranty
Should it appear to be necessary to return the instrument to our factory, authorization for the return must be obtained from Overhoff Technology Corporation prior to shipping. In- freight charges will be borne by the customer.
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