Related Manuals for overhoff RS400-HTO
Summary of Contents for overhoff RS400-HTO
- Page 1 OPERATION/MAINTENANCE MANUAL PORTABLE TRITIUM MONITOR MODEL RS400-HTO with Alkaline Battery Option OVERHOFF TECHNOLOGY CORPORATION 1160 US ROUTE 50, MILFORD, OHIO, USA...
- Page 3 SAFETY NOTICE This Tritium Monitor has been designed and tested in accordance with EN 61010-1. To ensure that the monitor is used safely, follow all safety and operating instructions in this manual. If the monitor is not used as described in this manual, the safety features of the monitor might be impaired. x Do not use the monitor unless it is fully assembled, housed inside the case secured with the screw fasteners it was supplied with.
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Page 4: Table Of Contents
FIGURE 1, FRONT PANEL CONTROLS FIGURE 2, HOSE BARB CONNECTION FIGURE 3, OUTPUT CONNECTIONS 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... -
Page 5: Introduction
1.0. INTRODUCTION The Model RS400-HTO portable tritium monitor is a small, high sensitivity, hand held, battery operated fully gamma compensated survey meter with an RS232 serial data output. instrument case is constructed of light weight aluminum. A handle is attached for hand held survey use. -
Page 6: Technical Specifications
2.0. TECHNICAL SPECIFICATIONS, MODEL RS400-HTO MEASUREMENT DISPLAY 4 1/2 digit LCD 1 to 19,999 μSv/hr MEASUREMENT RANGE NOTE: Conversion factor according to ICRP-68 Table C1 where: 1 μSv/h = 3.09E4 Bq/m = 0.835 μCi/m 2-3 μSv/hr h (2 μCi/m SENSITIVITY ACCURACY ±10%... - Page 7 TECHNICAL SPECIFICATIONS, MODEL RS400-HTO, continued IONIZATION effective volume: 400 cm CHAMBER VOLUME port to port volume: 440 cm POWER Alkaline Battery Option Requires two “D” size batteries Alkaline type with external jack for supplementary power input ENVIRONMENTAL 0° C to +40° C 20 to 90 % R.H.
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Page 8: Circuit Description
3.0. CIRCUIT DESCRIPTION CAUTION: This instrument has not been designed for indiscriminate opening or disassembly of the internal parts. Electrostatic charge from the bias voltage on the ionization chamber cans will be present even when the instrument is switched OFF. The detector pre-amp contains highly sensitive semiconductors which are destroyed by even the slightest electrostatic discharge. - Page 9 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.
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Page 10: Configuration
4.0. CONFIGURATION 4.1. EXTERNAL FEATURES The front panel features include: 1. the digital panel meter, 1 to 19,999 μSv/hr 2. function control knob 3. alarm level control knob, 2 to 1,000 μSv/hr 4. red LED; dual function; low battery, indicates when the D-cell batteries need to be replaced and indicates red if the high voltage power supply (HVPS) has a malfunction 5. -
Page 11: 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 “MEASURE”. The “low flow” LED will flash, since the pump is inactive. The “mute”... - Page 12 OFFSET COMPENSATION: 1. Switch the instrument into the measure model. 2. After approximately three minutes. The instrument should indicate 0000 on the digital panel meter. An offset of 5-7 μSv/hr is typical for situations due to temperature changes. This offset should disappear as thermal equilibrium is attained.
- Page 13 RS232 OUTPUT The RS232 interface serves the purpose of transmitting data to any digital computer via a standard 2 wire RS232 link. The data includes: The tritium measurement level, status for level and flow alarms, alphanumeric information representing location and identification for the instrument. With a personal computer use Hyper Terminal or another suitable application to view the data.
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Page 14: Calibration
6.0. CALIBRATION 6.1. METHOD Tritium monitors employing ionization chambers, such as the 400 series portable instruments 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 known field strength. - Page 15 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...
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Page 16: Maintenance
7.0. MAINTENANCE Overhoff 400 series portable instruments have been designed for many years of trouble free service. Very little maintenance is required, but some periodic attention may be necessary, especially if the instrument is to be used in adverse environments. -
Page 17: Service
7.1. D-CELL BATTERY REPLACEMENT The Model RS400-HTO with optional Alkaline batteries uses (2) “D” size Alkaline batteries. The batteries will need to be replaced within an hour after the low battery light illuminates. NOTE: Remove the batteries before shipment or inactive storage of more than 30 days This instrument contains components that are easily destroyed if the case is opened and handled without proper precaution. -
Page 18: Replaceable Parts
10.0. REPLACEABLE PARTS The following parts and components are disposable items and may be obtained from Overhoff Technology Corporation or from any original supplier: Battery, "D” size, alkaline P/N EN95,(qty 2 req’d) Dust Filter P/N 12082 Ionization Chamber Can P/N 1020686...
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