Ludlum Model 9DP-1 Ion Chamber - Used

  • Model: 9DP-1

Starting at: $2,200.00

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Pre-owned, Good Condition

The Ludlum Model 9DP-1 ion chamber meter is specially designed for radiography work where pulsed fields are being measured. This instrument correctly integrates 50 nanosecond pulses (and wider) that other systems typically miss or measure inaccurately. This instrument measures both exposure and exposure rate and can simultaneously display the exposure rate with either the integrated value or highest rate seen by the instrument. The integrated value can be reset (if desired) using one of the four convenient front-panel mounted buttons. The buttons also control instrument power, function selection, setting the speaker volume and acknowledging alarms.

The detector chamber is only pressurized to 1.7 atmospheres (20 psi), thus avoiding all (USA) HAZMAT concerns for shipping and handling. The stunning 256-color, bit-mapped display provides an optimized presentation of the data and is accompanied with icons informing the user of the active functions and instrument status. Alarms are manifested using color changes on the display and an acknowledgeable audio output.

The instrument is powered using NiMH type rechargeable batteries that deliver upto 30 hours operation between charges. Measurements can be logged to an industry standard, USB thumb drive plugged into the instrument USB port. Data are wriiten in csv format for convenient retrieval by a PC spreadsheet or database program.

The Model 9DP-1 features a built-in USB port facilitates password-protected access to parameter settings via direct connection to a USB keyboard eliminating any need to install PC application software or dealing with operating system compatibility issues.


RADIATION DETECTED: gamma & X-rays above 25 keV; beta above 1 MeV, correctly integrates pulsed fields with 50 nanosecond pulse widths

OPERATING RANGES: With R/h units: 0–5 mR/h, 0–50 mR/h, 0–500 mR /h, 0–5 R/h, 0–50 R/h With Sv/h units: 0–500 μSv/h, 0–5 mSv/h, 0–50 mSv/h, 0–500 mSv/h

CHAMBER VOLUME: 220 cc volume pressurized to 1.36 atmospheres (20 psi)

ACCURACY: +/-10%

RESPONSE TIME: 5 seconds in lowest range, 2 seconds in all other ranges, when measuring from 10% to 90% of final value MEASUREMENT READOUTS: simultaneous display of rate and either the integrated reading or highest rate (peak hold)

INCLUDED FUNCTIONS: integrated reading, peak reading, range lock (0–50 R/h) for reading pulsed fields

DATA LOGGING: Data is stored to detachable USB thumb drive in CSV format for easy retrieval by PC spreadsheet/database programs. Data points include real-time clock generated date and time with rate, integrated reading, and instrument status. Logging time intervals are set by PC interface program or standard USB keyboard.

LCD DISPLAY: 8.9 cm (3.5 in.) diagonal, 240 H x 320 W pixels, TFT active matrix, 262,000 colors, 220 cd/m²

USER CONTROLS: 4 pushbuttons: instrument on/off, peak rate/integrate mode, audio on/off, alarm acknowledge/meter reset/clearing integrated dose or peak rate

AUTOMATIC FUNCTIONS: auto ranging, auto zeroing, auto LCD backlighting

AUDIO OUTPUTS: built-in unimorph speaker, > 60 dB at 0.6 meters (2 ft.) An optional audio jack can be installed for connecting to an external headset (not supplied).

ALARMS: two levels of radiation alarms available, each are user programmable throughout entire readout range and set through a PC interface program. Other alarms include low battery and various detector failures.

TEMPERATURE RANGE: -20 to 40 °C (-4 to 104 °F) POWER: eight rechargeable "AA" NiMH batteries, supplied with wall charger for direct connection to instrument

BATTERY LIFE: 12 to 30 hours between charges, depending upon use of backlighting

USB INTERFACE: single USB port, may be connected directly to a USB keyboard to facilitate password-protected parameter changes, accepts USB thumbdrive for storing logged data, optional interface kit facilitates connection to a PC for paramater editing and calibration

CONSTRUCTION: durable molded plastic with internal metal support

SIZE: 21.9 x 11.6 x 24.5 cm (8.6 x 4.6 x 9.6 in.) (H x W x L) WEIGHT: 1.5 kg (3.3 lb), including batteries

This product was added to our catalog on Saturday 30 September, 2017.


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