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Summary of Contents for Ludlum Measurements 194 Series
- Page 1 LUDLUM MODEL 194 SERIES DOSE EQUIVALENT RATE METER June 2021 Serial Number 350220 and Succeeding Serial Numbers...
- Page 2 LUDLUM MODEL 194 SERIES DOSE EQUIVALENT RATE METER June 2021 Serial Number 350220 and Succeeding Serial Numbers...
- Page 4 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
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Page 5: Table Of Contents
User’s Manual Model 194 Series Table of Contents Introduction Getting Started Unpacking and Repacking Description of Controls and Functions Specifications Operating Procedures Calibration Non-Radiation Adjustment Calibration Equipment Required Initial Calibration Procedures Cs-137 Gamma Range Calibration Cs-137 Gamma Range – Overload Check... -
Page 6: Introduction
User’s Manual Model 194 Series Section 1 Section Introduction he Ludlum Model 194 DOSE EQUIVALENT RATE METER is designed to accurately measure gamma radiation doses. It utilizes a special plastic scintillator that converts the radiation to visible light, which is then measured and displayed. It is very sensitive and can measure background levels of radiation as well as higher levels. - Page 7 (part # 4475-118) and a shoulder strap (part # 4475-120). This manual encompasses the Model 194 Series, which includes the Model 194 (µrem/hr display and internal detector), the Model 194/E (µrem/hr display and extended detector), the Model 194/S (µSv/h display and internal detector), and the Model 194/SE (µSv/h display...
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Page 8: Getting Started
Repair and Calibration division where you will find a link to the form. Note: Ludlum Measurements, Inc. recommends recalibration at intervals no greater than one year, assuming that regular operational checks are performed. Check the appropriate local, state, and federal regulations to determine required recalibration intervals. - Page 9 User’s Manual Model 194 Series Section 1 position provides the operator with a full-scale reading of 1999 µrem/hr (or 19.99 µSv/h). Moving the range selector switch to the HI range position provides the operator with a full-scale reading of 199.9 mrem/hr (or 1999 µSv/h).
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Page 10: Specifications
User’s Manual Model 194 Series Section 3 Section Specifications Detector: 3.2 x 3.2 cm (1.25 × 1.25 in.) lead-loaded plastic scintillator Linearity: ±10% Energy Response (Model 194 and 194/S only): energy-flat within 30% ambient dose equivalent from 50 to 1300 keV, relative to... - Page 11 User’s Manual Model 194 Series Section 3 Battery Dependence: instrument calibration change of less than 3% from fresh batteries to batteries at the threshold of BAT OK, see below. Power: standard alkaline ˝AA˝ cell batteries, secured in an isolated compartment...
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Page 12: Operating Procedures
User’s Manual Model 194 Series Section 4 Section Operating Procedures Note: To open the battery lid, twist the slotted, knurled knob counter-clockwise a quarter of a turn. To close, twist clockwise a quarter of a turn. Open the lid and install two "AA" size batteries. Note the (+) (-) marks on the bottom of the battery holder. - Page 13 Proceed to use instrument. Use the LO range whenever possible, and switch to the HI range if needed. If the display over-ranges in the HI range, use another instrument to measure the radiation level. Ludlum Measurements, Inc. Page 4-2 October 2020...
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Page 14: Calibration
User’s Manual Model 194 Series Section 5 Section Calibration Calibration controls are under the CAL cover on the front panel. The controls may be adjusted with an 1/8-inch blade screwdriver. Non-Radiation Adjustment AUDIO CALIBRATION: Potentiometer marked AUD may be adjusted as desired. -
Page 15: Initial Calibration Procedures
User’s Manual Model 194 Series Section 5 Initial Calibration Procedures 1. If any calibration procedure cannot be completed satisfactorily, the instrument should be tagged and removed for proper disposition. 2. A “low” gamma background radiation area is needed, defined as an area away from known radiation sources, measuring 15 uR/hr (0.15 µSv/h) -
Page 16: Cs-137 Gamma Range Calibration
User’s Manual Model 194 Series Section 5 Cs-137 Gamma Range Calibration 1. Switch the instrument to LO range. 2. Ensure that the center of the detector is correctly placed and expose the instrument to a calibrated field of 1500 µrem/hr (15 µSv/h). Adjust the front-panel potentiometer marked L-HV until the instrument LCD shows 1500 µrem/hr (15.00 µSv/h) within 10%. - Page 17 User’s Manual Model 194 Series Section 5 Note: It may take the instruments a few (less than 5) minutes to recover and measure low radiation fields properly after this overload test. Ludlum Measurements, Inc. Page 5-4 October 2020...
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Page 18: Safety Considerations
User’s Manual Model 194 Series Section 6 Section Safety Considerations Environmental Conditions for Normal Use Indoor or outdoor use No maximum altitude Temperature range of -10 to 50 °C (14 to 122 °F). Display will tend to “freeze” if kept below 0 °C (32 °F) for several hours, so users should limit cold temperature exposure to less than two hours. -
Page 19: Cleaning And Maintenance Precautions
User’s Manual Model 194 Series Section 6 The “crossed-out wheelie bin” symbol notifies the consumer that the product is not to be mixed with unsorted municipal waste when discarding. Each material must be separated. The symbol is placed on the label located on the side panel. -
Page 20: Spare Parts List
User’s Manual Model 194 Series Section 7 Section Spare Parts List Item Part # Model 194 DOSE EQUIVALENT RATE METER 48-4364 Model 194/S DOSE EQUIVALENT RATE METER with µSv/hr Display 48-4364-1 Model 194/E DOSE EQUIVALENT RATE METER with Extended Detector... -
Page 21: Recycling
To this end, Ludlum Measurements, Inc. strives to supply the consumer of its goods with information regarding reuse and recycling of the many different types of materials used in its products. With many different agencies –... -
Page 22: Drawings And Diagrams
User’s Manual Model 194 Series Section 9 Section Drawings and Diagrams Model 194 Wiring Diagram, Drawing 475 x 103 Ludlum Measurements, Inc. Page 9-1 October 2020...
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