AMES MRS 110B-1 Manual - Page 8

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Radiological monitor MRS 110B-1

Manual

2. USE OF MRS 110B-1

MRS 110B-1 is switched on by pressing the "ON" key. Immediately after this,

self-test is done: all segments of LCD are turned on and content of EEPROM

is checked. If an error is detected in EEPROM, message "Err0" is displayed

on the LCD and instrument runs with the default settings. Default values are

summarized in the section »SETTING THE PARAMETERS".

After instrument being turned on, measured value slowly rises to the "real"

value. Velocity of approaching the "real" value depends on the measured

activity, but in all cases MRS 110 B-1 after 1 minute shows result within the

declared statistical uncertainty.

MRS 110 B-1 (after at least 1 minute from the switch-on) is carried by an

operator as a personal radiation meter. Acoustic signals indicate passing of

photons through the GM tube. When there is no elevated background,

approximately 20 short beeps are heard each minute, MRS 110 B-1 showing

aprox. 20 cpm. If we detect an increased frequency of beeps (or increased

value on LCD), this means that we are approaching the source of ionising

radiation.

In this case we turn the side of MRS 110 B-1, marked with the red dot (side

with the GM tube), towards the source. Beeping immediately follows the

radiation strength, LCD result, due to the numeric filtering, with slight delay.

In any case, at latest after 1 minute, result is accurate within the statistical

uncertainty.

If alarm level is exceeded, acoustic alarm is heard.

Measuring results are shown on LCD both in digital and in analogue form.

Range is automatically scaled to the range of the measured value. For the

analogue scale, factor in the upper right corner shows the power of 10, with

which readings on the semicircular scale should be multiplied.

At extremely high dose rates, GM tube becomes saturated. MRS 110 B-1

detects it and starts emitting continuous sound. Such audible signal warns us,

that radioactivity is over limits, measurable with MRS 110 B-1.

AMES d.o.o. Jamova 39, Ljubljana, Slovenia