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940-3 On-line (Snowplow) Monitor

On-line (Snowplow) Monitor


The Model 940-3 On-Line (Snowplow) Monitor is an easily installed, liquid effluent monitor that clamps around a process line to be monitored.

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Key Features

  • Horizontal or vertical configurations
  • Hinged door for ease of detector replacement
  • Air purge for hazardous locations
  • Integral junction box for cable termination
  • High temperature gamma scintillation detectors available
  • Universal Digital Ratemeter or microprocessor based ratemeter with dynamic range up to 107 CPM
  • Sensitivity comparable to in-line type
  • NaI gamma scintillation detector for sensitivity and reliability
  • Ease of installation


The Code of Federal Regulations requires assurance that radioactive materials within liquid effluents do not exceed maximum permissible concentrations (MPC) as set forth in the United States Nuclear Regulatory Commission (USNRC) radiation protection standards. This simply means that any effluent that could possibly contain radioactivity must be monitored. Besides the legal implications, sound industrial hygiene practices require that personnel be protected against the possibility of exposure to excessive radiation from any source. Scintillation detectors are used because of their sensitivity and reliability.

  • On-line liquid monitor
  • Compatible with Model 943 Series detectors and Model 942A Series or Model 960 Series electronics
  • Non-Invasive to process line
  • Available for various pipe diameters

Additional Information

The detector measures gross gamma radiation in the process fluid, amplifies and shapes the pulse output from the photomultiplier tube and transmits the signal to the Universal Digital Ratemeter. The ratemeter may be locally mounted or remotely located up to 1500 feet. The ratemeter displays measured radiation in CPM. The ratemeter also provides output alarm contacts for Alert, High Radiation and Channel Fail. Check source actuation is manual from the ratemeter, with alarms muted when in the check source mode. The Model 940-3 assembly may be furnished with the optional cooling water jacket around the standard detector or with a high temperature gamma scintillation detector (up to 300ºF) for high temperature process liquid applications. The Snowplow monitor can be oriented either horizontally or vertically to accommodate plant process piping runs.


Model Name


940-3 On-Line (Snowplow) Monitor
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