DSM-500 Radiation Survey Meter

For External Probe

DSM-500 Survey Meter by WB Johnson

Choose from G-M, NaI Scintillation, Plastic Scintillation, and Alpha Scintillation Detectors

The DSM-500 includes a large, backlit digital LCD display. The DSM-500 can be configured to indicate, CPM, CPS, R/hr and/or Sv/hr. Units can be easily changed with an internal switch; no recalibration is required. The survey meter includes probe-saturation and other error indicators. A scaler function and adjustable alarms are also included. This survey meter supports most external probes. For a choice of probes with photos and specifications, scroll down for a list of probes. If you require a dual probe survey meter, we recommend the DSM-525.

DSM-500 Survey Meter Manual

Dose/Counts Switch Change Dose Rate to Count Rate by Toggling an External Switch
Display LCD 4-Digit x .75" LCD w/LED Backlight
External Probe Input All Johnson Probes
Dose Range Probe Dependent
Energy Range Probe Dependent
CPM Range 0-999.9 Kcpm or Kcps
Probe Linearization Internal adjust for calibration constant and dead time
Scaler Ranges 0-999.9 Kcounts
Scaler Count Time Ranges 10-2550 Seconds (10 second increments)
Alarms 5-95% of Range
Diagnostics Low Battery, Over-range - Audible & Visual Alarms
Range Adjustment Auto-Ranging All Scales
Electrical Non-Linearity < 5% Full Scale
Response Time Fast - 10-2550 Seconds (adjustable) | Slow 10-250 seconds (adjustable)
Drift < 5%
Environmental -20°F [-28°C] to 140°F [60°C] 5-95% RH IPX4 Housing
High Voltage Adjustable 400-1250 VDC | Regulation +-1%
Battery 6 - "AA" Alkaline (nominal 200hrs Operation)
Dimensions 6.25" (16cm) H x 4" (10cm) W x 7" (18cm) L
Weight 2.5 lbs. (1.2 Kilos)

Probes /Detectors Available, Choose one per monitor.

Pancake GM probe, HP-265 by Johnson Nuclear

General Purpose Survey

HP-265 G-M Pancake Probe

Sodium Iodide Scintillation Detectors for Gamma - MircoR

 Johnson Nuclear MRSP-1 plastic Scintillation detector

GLE-1 Probe for Low Energy Gamma
GSP-1 NaI Scintillation, 1 inch x 1 inch
GSP-2 NaI Scintillation probe, 2 inch x 2 inch

Gamma Plastic Scintillation - MicroR

MSRP-1 Plastic Scintillation Probe measures in the microR range
MSRP-2 Plastic Scintillation Probe measures in the microR range

Model  GP-1010 probeG-M Probes

GP-1010 Beta-Gamma G-M Probe with rotating beta window
GP-200 End-Window G-M Probe
GP-1001 Energy Compensated Cylinder G-M probe (0-200 mR/hr)
GP-1002 Energy Compensated Cylinder G-M (0-2,000 mR/hr)
GP-1003 Energy Compensated Cylinder G-M probe (0-10,000 mR/hr)

Alpha Scintillation Probe

Model ASP-2A 2" x Alpha Scintillation Detector