DSM-506 Digital Survey Meter

Includes internal probe for added high range

Ideal for Nuclear Medicine Applications

DSM-506 Survey Meter by WB JohnsonHP-265 Pancake GM probe by WB Johnson

The DSM-506 is a digital, auto-ranging, microprocessor-controlled instrument with a large backlit, digital LCD. An internal probe is included for high range. The user must choose an external probe. This instrument can be configured to indicate, Cpm, Cps, R/hr and/or Sv/hr. Standard features include diagnostics, scaler, adjustable alarms, over-range alarm and other error indicators. The DSM-506 supports several different probes. Separate HV supplies for each detector enable the utilization of any Johnson probe. Each detector has full auto-ranging and can be utilized for separate functions: internal= dose and external= CPM or a different dose range. The DSM-506 meets nuclear medicine requirements. Over-range and regular alarms are provided for each detector. Diagnostics are standard. An RS-232 data output is available on request.

DSM-506 Survey Meter Specifications

Input Sensitivity: 0.050v
Dose/CPM Switchable: External Dose/CPM switch
Display units: (four Digit LCD w/backlight) CPM, KCPM, CPS, μR/hr, mR/hr, R/hr, μSv/hr, mSv/hr, Sv/hr
Display refresh rate: 0.8-3.0 seconds, adjustable
Display Back Light: Toggle Switch on for 30 seconds auto OFF, Repeat as needed
Scaler Timed Count: Settings 0.10-2550 seconds in 10 second increments
Probe 1 Range: (HP-265 Pancake probe) 0-200 mR/hr, 0-999,9 K CPM (other ranges and probes available)
Internal Detector: EC GM Detector 0-2,000 mR/hr - 0-999.9Kcpm
Scaler Range: 0-999.9Kcpm
Diagnostics: Low Battery, Over Range, HV out of range
Alarm: Adjustable from 5% to 95% of full scale for Dose and CPM
Over Range Alarm: Adjustable 10% above maximum range (dose calibration only)
Electrically Linearity: < 5%
Response Time: Fast: 10-250 seconds , Slow: adjustable from 10 --250 seconds
Drift: < 5%
Environmental: -20 deg F (-28 deg C) to140 deg F (60 deg C) | 5-95% RH IPX4 Housing
#1 High Voltage Adjustable: 300-1500 VDC | Regulation ±1%
#2 High Voltage Adjustable: 300-1500 VDC | Regulation ±1%
Audio: (loud click per input event) On/Off switch on Front panel
Battery: six AA Alkaline (Nominal 200 hrs Operation)
Display: four digit 0.75” (19mm) tall with Led backlight
Circuitry: Digital Microprocessor Controlled
Dimensions: 5.5" (14cm) H X 4" (10 cm) W X 7" (18cm) L
Weight: 2.5lbs (1.2 kilo) W/ Batteries
Construction: Heavy Duty Cast Aluminum & Stainless Steel

The most common choice for an external probe is:

HP-265 G-M Pancake Probe Specifications

Description: Long life halogen pancake G-M detector with 1.6 mg/cm2 End Window
Efficiency: (4pi geometry): Typically 5%-C-14; 22%-Sr-90/Y-90; 19%-Tc-99; 32%-P-32; 15%-Pu-239, Gamma dose to 200 mR/hr (Based on 137Cs calibration)
OperatingVoltage: 900 vdc
Window Thickness: 1.6mg/cm2
CPM/mR/hr: (137CS): 2,500
Energy Response: 3.5 MeV alpha, 20 MeV gamma, 100 keV beta
Sensitive Area: 15 cm2
Finish: Polyurethane Coated Aluminum
Dimensions: 2.75" dia. X 11" long
Weight: 16 ounces
Environmental: 20º - 60ºC, 5% - 95% RH non-condensing---IPX4
Construction: Polyurethane coated aluminum probe housing, nylon coated stainless steel probe clip

Other probe configurations are available.

DSM-506 Survey Meter with internal high range G-M probe and external pancake G-M probe (Order Online) (US Orders ONLY)(Please make sure to choose an external probe. SSL Encypted Ordering. )

For other probe configurations, please call.


Nuclear Instrumentation

Dosimetry Shielding Sources Specials

Hepa Vacuums

Chemical Detection

Marinelli Beakers

Fume Hoods


Emergency Response

Nuclear Medicine

Radiation Therapy Search Home

Direct Scientific  /  tel (310) 589 0601 /   Email

contact us: en español, auf Deutsch
Open 8:00 AM - 5:00 PM Pacific Standard Time
Follow us on twitter and youtube.
visit our youtube channel
follow us on twitter
Check out our instrument demos.