The Model 26-1 uses a time-tested GM detector in an ergonomically designed, ruggedly-constructed, and water-resistant housing using cable-less design. These features combine with other user-friendly functions such as a large LED display, automatic backlighting, and 3-button operation to make surveying personnel and objects into a simple operation. The Model 26-1 DOSE is a variant of the Model 26-1 with a removable energy compensation filter that flattens the energy response to facilitate measuring Ambient Equivalent Dose (Sv).
The Model L-2002-1050 Ambient Dose Equivalent Filter simply snaps on the face of the Model 26-1 whenever dose measurements are desired. The filter is easily removed to allow the operator to continue with measuring contamination.
The Model 26 series may also be ordered with a standard 3 mm (1/8 in.) plug, mono headphone jack to better monitor the instrument's audible output in noisy environments (part number 4498-538). See more under the Options tab.
- Integrated, Lightweight Design Simplifies Frisking
- High-Impact Plastic with Water-Resistant Rubber Seals
- Employs Standard 15.51 cm2 GM Pancake Detector
- Displays in mR/hr, µSv/h, dpm, Bq, cpm, or cps
- Dead-Time Correction (DTC) Allows Gamma Measurements Up to 500 mR/hr or Up to 1999 µSv/h
- Simple Three-Button Operation
- Count Rate, Dose/Exposure, and Counting Alarms
- Automatic Display Backlight
- Bright Red Flashing ALARM LED
- Includes Wrist Strap, Clear Pancake Cover & Ludlum Lanyard
- DETECTOR: pancake GM (Geiger-Mueller) detector, stainless steel screen (79% open)
- WINDOW AREA: Active: 15.51 cm² (2.4 in²); Open: 12.26 cm² (1.9 in²)
- EFFICIENCY (4π) Alpha: 11% for 239Pu; Beta: 18% for 99Tc; 32% for 32P; 2% for 14C; 22% for 90Sr/90Y; 0.2% for 125I: Gamma: 3300 cpm/mR/hr or 5.5 cps/μSv/hr (137Cs) ≤1% for 99mTc
- RESOLVING TIME: approximately 110 microseconds as defined by IEC 60325
- LINEARITY: ± 10% ALARMS: count rate and scaler alarm setpoints adjustable over the display range
- OVERLOAD: high count rate saturation protection prevents false display of lower count rates
- ZERO PROTECTION: after 60 seconds of no pulses from detector, unit will flash a zero reading and the alarm audio will be triggered
- LCD DISPLAY: 3½ digit LCD with large 12.7 mm (0.5 in.) digits, (k)cps, (k)cpm, (k)dpm, (k)Bq, mR/hr, µSv/h, Bq, and dpm; low battery indicator, MAX, ALARM
- RANGE: 0.1 cps to 19.9 kcps, or 1 cpm to 999 kcpm, 0.0–500 mR/hr, 0.01–1999 µSv/h; 0.1–19.9 kBq; 1–999 kcpm
- BACKLIGHT: built-in ambient light sensor automatically activates low-power LED backlight, or may be configured for ‘Continuous On’ operations (will reduce battery life)
- CONTROLS: three pushbuttons
- ON/OFF/QUIET: press to turn ON, tap to alternate between ‘click’ audio and QUIET, hold for OFF
- MODE: select NORMAL (count rate), MAX (captures peak rate), or COUNTER (user-selectable count time from 0–20 minutes) •
- UNITS: changes units from count rate (cpm, cps) to dose/exposure (µSv/h, mR/hr) to activity (dpm/Bq)
- RESPONSE TIME: user-selectable from 1 to 60 seconds, or Auto-Response Rate FAST or SLOW
- CLICK AUDIO: greater than 60 dB at 0.6 m (2 ft)
- POWER: two “AA” batteries
- BATTERY LIFE: approximately 1000 hours of operations (as low as 500 hours with backlight configured for ‘Continuous On’), 16-hour low battery warning
- CONSTRUCTION: high-impact plastic with water-resistant rubber seals and separate battery compartment
- ENVIRONMENTAL RATING: NEMA 3/IP 53
- TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F), may be certified for operation from -40 to 65 °C (-40 to 150 °F)
- DISTANCE FROM SURFACE PLANE TO SCREEN: 0.32 cm (0.125 inch)
- SIZE: 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in.) (H x W x L);
- WEIGHT: 0.45 kg (1.0 lb)
| Code | Description |
| 48-3965 | Model 26-1, Integrated Frisker |
| 47-4007 | Model 26-1 DOSE, Integrated Frisker with Dose Equivalent Filter |
