MODEL 200SB Tritium Detector

MODEL 200SB HTO Tritium Detector

The Overhoff Technology Corporation 200SB portable tritium survey monitor is a low cost light weight survey meter. The front panel features only three controls, an ON - OFF - SAMPLE switch and the switch for setting the alarm level. Zero adjustment is unnecessary, the 200SB shows no zero drift over a temperature range of 0° C to +50° C. A large pump and fast electronics are combined to give this instrument fast overall response.

This instrument is useful where measurement sensitivities of the order of 10μCi/m3 (1 MPCA) is sufficient, and where wide range, and fast response are needed. This low cost portable model has a 4 1/2 digit LCD display for readings from 0 to 19,999 MPCA.

The instrument needs no zero adjustment. It is ready for use by merely selecting the desired alarm level and activating the instrument power. The initial power surge transient will disappear in a minute, the readings will then be accurate.

The use of twin, side by side, or coaxial ionization chambers provides gamma compensation in moderate background gamma radiation fields.

The use of a large pump, 3 liters a minute, together with fast electronics yields an overall measurement time constant of under 5 seconds.

An HTO discriminating version is available. By addition of an external desiccant column, this survey instrument will specifically measure HTO in the presence of HT, or other radioactive gases.

MODEL 200SB Tritium Detector Specifications

MEASUREMENT RANGE 10 – 199,999 μCi/m3, basic sensitivity of the order of 10 μCi/m3

DISPLAY 0 – 19,999 digits, LCD panel meter

GAMMA COMPENSATION two chambers in a side by side arrangement

RESPONSE RATE 5 seconds to reach 90 % of final reading,

NOISE LEVEL +10 μCi/m3, 1 S.D. (3 second electronic time constant)

ZERO STABILITY after 1 minutes (or less) warm up, the zero drift to less than 10 μCi/m3

ALARM (ACOUSTIC) 1. nine position stepped attenuator set point for signal of 20 – 10,000 μCi/m3, steady tone 2. low flow produces a steady tone

ALARM (VISUAL) signal level: red LED

low flow: yellow LED

low battery: red LED

DUST FILTER in line disposable cartridge Pall No. 12082

SAMPLING SYSTEM 2 hose barb ports are located on the front panel

IONIZATION effective volume: 200 cm3

CHAMBER VOLUME port to port volume: 220 cm3

PUMP Special high volume internal pump for a flow rate

from 2-3 LPM

POWER two “D” size batteries alkaline, carbon-zinc or NiCd,

ENVIRONMENTAL 0 ° C to +50° C, 0 - 98 % RH

CASE light weight aluminum

SIZE AND WEIGHT 7.6" L, 5.2" W, 4.4" H excluding handle, 5 lbs (2.3 kg)

ACCESSORIES sniffer hose

OPTIONAL EQUIPMENT transit case, jack for external power supply

 A special version of the basic 200SB instrument with six hose connections is available for specific HTO measurement in the presence of HT or other radioactive gases as well as external and internal gamma fields.