- Light Weight - Approximately 1/3 the Weight of Comparable Instruments
- 1.1 m (45 in.) to 4.5 m (177 in.) Telescoping Carbon Fiber Pole
- 10 µSv/h–10 Sv/h (1 mR/hr–1000 R/hr)
- 1 µSv/h (0.1 mR/hr) Display Resolution
- Large Backlit Auto-Ranging LCD with Adjustable Viewing Angle
- Simple Green, Yellow, and Red Status Indicators
- 3-Button Intuitive Interface for Easy Operation
- USB Port and All-Digital Calibration
The Model 79 Stretch Scope provides the operator with the ability to investigate areas of suspected gamma contamination while remaining at a greater distance from potentially high fields of radioactivity. The 4.5 m telescoping pole allows the attached detector to reach areas difficult to access with other types of instruments.
A large, easy-to-read LCD display rotates to maximize ease of viewing. Padded shoulder strap (included), piercing warning tone, and easy, intuitive design are also featured. The unit’s body is made of durable, high-impact plastic with splash-resistant construction allowing the Model 79 to be used outdoors.
This versatile instrument has three modes of operation - RATE, MAX, and COUNT. Measurements can be collected in two sets of units (primary and secondary) for RATE and MAX modes in cps, spm, Sv/h, mrem/hr, and R/hr units. The user can choose between two sets of units by simply pressing the Units button. An internal switch is used to enable or disable the front-panel setup feature to protect desired settings from inadvertent modification.
Specifications
DETECTOR:Geiger-Mueller (GM)
ENERGY RESPONSE: within 25% of true value from 60 keV–3 MeV
LINEARITY: reading within 10% of true value
ALARMS: count rate, exposure/dose, and scaler alarm setpoints adjustable over the display range
OVERLOAD: high count rate saturation protection to prevent the false display of lower count rates
LOSS OF COUNT ALARM PROTECTION: after preselected time interval (default 60 seconds) of no pulses from detector, audible and visual alarms will be activated
LCD DISPLAY: 3-digit LCD with large 13.4 mm (0.53 in.) digits, (k)cps, (k)cpm, (k)Bq, (k)dpm, (μ)(m)R(/h), (μ)(m)Sv(/h), low-battery indicator, MAX, ALARM, MUTE
DISPLAY RANGE: 0.0 cps to 99.9 kcps; 0.00 cpm to 999 kcpm; 0.00 Bq to 99.9 kBq; 0.00 dpm to 999 kdpm; 0.00 μR/h to 999 R/h; 0.00 μSv/h to 999 Sv/h. Max Display can be set to limit display to calibrated range
BACKLIGHT/RESET: built-in ambient light sensor automatically activates low-power LED backlight, unless internal dipswitch is set to continuous-On (will reduce battery life)
USER CONTROLS:
ON/OFF/ACK - press to turn ON, tap to acknowledge alarms and silence alarm tone, press to reset Sigma Audio alarm, turn "click" audio On/Off, turn Sigma Audio beep On/Off, hold for OFF
MODE - alternates between NORMAL (count rate), MAX (captures peak rate), and COUNT (user-selectable preset count time from 0 to 10 minutes). Number of modes can be reduced in setup.
UNITS - changes the units between primary and secondary units
RESPONSE TIME: user-selectable from 1 to 60 seconds, or Auto-Response Rate FAST or SLOW
ALARMS: count rate, exposure/dose, and scaler alarm setpoints adjustable over the display range
AUDIO: greater than 75 dB at 0.6 (2 ft), approximately 4.5 kHz
POWER: two alkaline or two rechargeable “AAA” batteries (instrument does not support in-device charging)
BATTERY LIFE: approximately 100 hours of operation, 16-hour low battery warning, and battery level indicator at start up
CONSTRUCTION: Meter - high-impact plastic with water-resistant rubber seals, separate battery compartment. Probe - carbon fiber telescope. IP (Ingress Protection) rating of 52 on the electronics
TEMPERATURE RANGE: -20 to 50 °C (-5 to 122 °F), may be certified for operation from -40 to 65 °C (-40 to 150 °F)
SIZE: 20.3 x 8.1 x 114 cm (8 x 3.2 x 45 in.) retracted; 4.5 m (177 in.) fully extended.
WEIGHT: 1.0 kg (2.3 lb), including batteries
