SEEIT TM-91N Manuel D'utilisation page 4

Operation procedure:

Press the
two seconds. It is now ready for testing

Intermittent BEEP signal follows during detection, auxiliary radiation strength sensing. The higher the reception rate.

Press the

Press the

Press the
setting value.

Press the

Press again
value.

 button or
Press the

Press again
LCD display ON or OFF.

Press the

Press again
button or
press
button 1 second to exit and return measurement mode.

The Geiger –Mueller tube is located behind the slots in the upper edge of the case. The surface of the tube is very thin.

This allows beta radiation to penetrate and to be detected with greater efficiency. (Beta rays and other types of radiation will
be discussed in the next section). This thin surface is fragile and poking sharp objects through the lots will damage the tube.

Your Geiger Counter is designed to be sensitive to :
- Gamma radiation (which includes X-Rays).
- Beta radiation.

Gamma radiation and X-rays can penetrate the plastic case with comparative ease.

Beta radiation can most efficiently enter the case through the slots. Although Beta Radiation is easily detected. It is difficult
to measure accurately. Therefore, when a radioactive object is being searched for beta radiation, the open slots in the case
should be positioned in such a way that they are exposed to the object (see Figure 1).

If the unit shows a significantly higher reading with increasing beep sound volume in this position, you can be certain that
the object is emitting Beta radiation.

Now position the unit as shown in Figure 2. In this position, where radiation cannot pass directly through these slots (Beta
Radiation travels in straight lines for the most part) only Gamma X-ray radiation from the object will be detected. This is the
position in which to hold the Geiger counter to take reading.
power switch button: All segment of the LCD indicator is illuminated together with BEEP signal for about
button: Select test unit µSv/h (T1).
button: Select test unit µRem/h (T2).
button for more than 1 second to enter setting alarm – mode, the LCD display "ALR" first the press the
 button or  button to change three digit values, Alarm the initial value 0.5µSv/h.
button more than 1 second to enter setting auto power (APO), the LCD display "APO" first the setting
 button change the digit value, Auto power off setting, the initial value is 30 minutes.
button more than 1 second to enter the setting buzzer ON or OFF, the setting default is always " ON", the
button or  button change the ON or OFF.
button more than 1 second to enter setting calibration factor, the LCD display "CF" first the setting value,
 button change the digit value. Calibration factor the initial value 1.00, Press again