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The CRM-100 The CRM-100 is a general purpose geiger counter that measures alpha, beta, gamma, and x-radiation. Like the popular Radalert 100, the CRM-100 features a 3-second update on its digital liquid crystal display (LCD). The LCD shows the current radiation level in your choice of milliroentgens per hour from .001 to 110 or counts per minute (cpm) from 0 to 350,000. When SI units are selected, the LCD shows readings in microsieverts per hour from .01 to 1100 or counts per second (cps) from 0 to 3,500. This instrument also offers an accumulated total and timer function, up to 9,999,000 counts and 40 hours. A red LED blinks and a beeper chirps with each count (the chirp can be muted). Use the CRM-100 to: • Detect the presence of ionizing radiation • Measure background radiation • Detect radiation leaks and contamination • Monitor changes in background radiation • Demonstrate principles of nuclear physics • Check for radioactive minerals in the earth Specifications: Sensor: • Halogen-quenched Geiger-Meuller detector (LND712) • Mica end window density is 1.5-2.0 mg/cm² • Side wall is 0.012' #446 stainless steel • Detects Alpha, Beta, Gamma, and X-radiation Display: 4-digit liquid crystal display with mode indicators Operating range: mR/hr: .001-110 CPM: 0-350,000 µSv/hr: .01-1,100 CPS: 0-3,500 Total: 0-9,999,000 counts Timer: up to 40 hours Calibration: Cesium 137 (gamma) Sensitivity: 1000 cpm/mR/hr referenced to Cs-137 Accuracy: ±10% typical; ±15% max. (mR/hr & mSv/hr modes) Alert: No alert feature. If your intended application requires a user-adjustable alert, we recommend the Radalert 100. Count light: Red LED flashes with each count Audio: Beeper chirps for each count (can be muted) Ports: • Output: Stereo 3.5 mm jack sends counts to computers, data loggers, other CMOS-compatible devices, and headphones • Input: Mono 2.5 mm jack provides electronic calibration input Power: One 9-volt alkaline battery; average battery life is 2160 hours at normal background, 625 hours at 1 mR/hr with beeper off Size: 150 x 80 x 30 mm (5.9' x 3.2' x 1.2') Weight: 225 grams (8 oz) including battery Options: Computer cable and software (IBM PC compatible) บริษัท โฟร์โทรนิคส์ เทคโนโลยี จำกัด www.fourtronic.com Tel. 02-914-2075 MB : 086-331-2488 E-mail : [email protected]