Victoreen 190 Radiation Survey and Count Rate Meter

Model 190 is a portable, battery-operated general-purpose survey meter for use with most scintillation and Geiger-Mueller (GM) radiation detector, proportional counting probes, and neutron probes. The design combines CMOS microprocessor technology, automatic range changing, and a Liquid Crystal Display (LCD) into an easy to use instrument. Refer to Figure 1-1 for a general view. The Model 190 is housed in a lightweight, plastic case designed for portability and durability. Measurement results are indicated on the front panel LCD.

The display includes:

• A 51 element analog bar graph near the top of the display to provide real time response.

• A scale multiplier, located below the bargraph relates the analog bargraph full scale to the units displayed.

• Detector range bargraph consisting of five horizontal bars that indicate the quantity of the dynamic range of the detector in use.

• A 16 character alphanumeric display that (1) provides a digitized average of the bargraph value or integrated reading with elapsed time, and (2) displays operational information (e.g., such as response time changes or changes in the units of the display).

• A backlight, activated by either of two front panel switches that provides for operation in dark environments. The analog bargraph emulates an analog meter movement and is especially useful in survey applications. The digitized value is intended for quantitative analysis and data logging applications where an interpretation of the average reading of the analog bargraph is required. The following controls are available from the front panel:

• Light (2) activates the LCD backlight.

• Mode changes the display units.

• Log, if activated, logs currently displayed data or changes current location identifier, depending on the currently active logging mode (i.e., timed or manual logging)

·       Rate/Integ toggles the alphanumeric display between the digitized rate value and the integrate value.

• Resp Time changes the response time on the first range or resets the integrate value and elapsed time (if pressed and held for three seconds).

• Audio toggles the click output associated with counting events in the detector on/off and acknowledges alarms.

• On/Off turns instrument power on/off when permitted by the microprocessor (i.e., when Logging is inactive or all logged data has been uploaded to a computer).

The batteries (four) are housed in a separate compartment accessed from the instrument back panel. All four 9-volt alkaline batteries are required to operate the unit for approximately 200 hours. Visual and audible low battery indications are provided whenever battery power is low (four minute intervals for the audible and continuous for the visual after a battery test). Communication with the Model 190 is accomplished through an optional infrared two-way adapter, Model 190-1A, which mounts at the top of the instrument. The adapter provides positive keying with the instrument for stable connection and communication.

Specifications

Radiation Detected: Alpha, Beta, Gamma, or X-ray depending on detector used.

Operating Rang: Rate Mode: CPM: 0-100; 0-1000; 0-10,000; 0-100,000; 0-1,000,000, and 0-10,000,000. CPS: 0-1, 0-10, 0-100, 0-1000, 0-10,000, 0-100,000, and 0-166,666. µR/hr, mR/hr, R/hr, µSv/hr, mSv/hr, Gy/hr, dpm, Bq/cm2, & µCi/cm2: Integrate Mode: Counts: 0-100,000,000; displayed as 4 digits up to 9999 counts, 3 digits plus a K (for thousand) or an M (for Million) at higher counts. Seconds: 0-65535; displayed as 4 digits up to 9999 seconds, 3 digits in minutes and tenths of minutes above 9999 seconds. µR, mR, R, cts, d, µSv, mSv, Bq, & µCi: depends on conversion factor of the probe used.

Accuracy: Within 10% of reading between 10% and 100% of full-scale indication on any range, exclusive of energy response. Ranges: Six (6) decades are available for calibration; the number of usable decades is detector dependent.

Deadtime Correction: Provided above 1000 CPM.

Jam Detection: Adjustable level for determining jam condition; provided in probe adapter modules. Alarm: Can be set on any decade at 10% to 100% (in increments of 10%) of full scale.

Detector Probes: Part No.: 489-4, 489-35, 489-50, 489-55, 489-60, 489-110C, 491-30, 491-40, 493-50, 425-110A, 425-200, 489-120, 489-200, RP-1 & PRN