• High µR sensitivity measurement of rate and dose simultaneously
• Records peak rate using “Freeze Mode”
• Auto-ranging and auto-zeroing
• RS-232 communications interface with optional Windows-based Excel add-in for data logging
• Ergonomic, anti-fatigue handle with replaceable grip, wrist strap and tripod mount
• Programmable flashing LCD display
• Easily-accessible battery door (operated by two 9-volt alkaline batteries) on the outside of the bottom case
• Available with dose equivalent energy response (SI units)

451P Pressurized µR Ion Chamber Survey Meter – Specifications

Key Features:

• High µR sensitivity: Measures radiation rate and accumulated dose simultaneously.

• Freeze Mode: Records peak rate using "Freeze Mode".

• Auto-ranging and auto-zeroing: Automatically adjusts measurement ranges and zeroes the instrument.

• RS-232 communications interface: Allows data logging with optional Windows-based Excel add-in (451EXL).

• Ergonomic design: Features an anti-fatigue handle with replaceable grip, wrist strap, and tripod mount.

• Programmable flashing LCD display: Enhances visibility and user interaction.

• Easily accessible battery compartment: Operated by two 9-volt alkaline batteries.

• Available with dose equivalent energy response: Complies with SI units.

Technical Data:

• Radiation Detected:

  • Beta: >1 MeV

  • Gamma: >25 keV

• Operating Ranges:

  • 0 μR/h to 500 μR/h (5 sec response time)

  • 0 mR/h to 5 mR/h (2 sec)

  • 0 mR/h to 50 mR/h (1.8 sec)

  • 0 mR/h to 500 mR/h (1.8 sec)

  • 0 R/h to 5 R/h (1.8 sec)

• Accuracy: Within 10% of readings between 10% and 100% of full scale indication on any range, exclusive of energy response.

• Detector: 230 CC Pressurized ionization chamber to 8 atmospheres or 125 psi.

• Controls: ON/OFF and MODE buttons.

• Automatic Features: Auto-zeroing, auto-ranging, and auto-backlight.

• Warm-up Time: Less than one minute for initial operation when the instrument is in temperature equilibrium with the surrounding area.

• Display:

  • LCD analog/digital with backlight.

  • Analog: 100-element bar graph (6.4 cm long).

  • Digital: 2.5-digit display with significant zero digit, units of measurement indicated on the display at all times.

  • Low battery and freeze indicators.

• Modes:

  • Integrate mode: Operates continuously 30 seconds after the instrument has been turned on.

  • Freeze mode: Places a tick mark on the bar graph display to hold the peak displayed value.

• Environmental:

  • Temperature Range: -20°C to 50°C (-4°F to 122°F).

  • Relative Humidity: 0% to 100%.

  • Geotropism: Negligible.

• Typical Energy Dependence: 16NIT gamma rays are 110% to 120% of indicated readings as determined at the University of Lowell.

• Power Requirements: Two 9 V alkaline batteries, providing approximately 200 hours of operation.

• Dimensions: 10 cm x 20 cm x 15 cm (4 in x 8 in x 6 in).

• Weight: 1.07 kg (2.4 lb).

Ordering Information:

• Models:

  • 451P-RYR: Pressurized µR Ion Chamber Survey Meter with standard chamber.

  • 451P-RYR-SS: Pressurized µR Ion Chamber Survey Meter with molded grip handle and shoulder strap.

• Optional Accessories:

  • 451EXL: 451 Assistant for Excel, includes RS-232 interface cable.

  • 190HPS: Single Unit Carrying Case.

  • 62-103: Check Source, 137Cs, 10 µCi. Flat disc, 1-inch diameter.

N/A

• Accessories:

  • 451EXL: 451 Assistant for Excel, includes RS-232 interface cable.

  • 190HPS: Single Unit Carrying Case.

  • 62-103: Check Source, 137Cs, 10 µCi. Flat disc, 1-inch diameter.