If the measured DER value is over the upper limit of the DER indication range
(200 mSv/h for the РМ1621, РМ1621М and 2.0 Sv/h for РМ1621А, РМ1621МА), the LCD
will show the overload symbol “OL” and non continuous audible signal will sound.
In the DER mode the collected statistics of DER measurement can be reset and the
process of measurement can be reactivated by simultaneous pressing of the
LIGHT/SET+MODE buttons.
2.4.4 DE measurement mode
In the DE mode (figure 2.3) the following values are indicated on the LCD:
- DE ( Sv, mSv, Sv);
- DE accumulation time.
DE and DE accumulation time reset is possible in the set mode by simultaneous
pressing of the LIGHT/SET+MODE buttons (figure 2.3).
In the mode of data transmission to PC it is possible to set an inhibit for DE reset
using the buttons.
There are two methods of measurement of the DE accumulated over a certain period of
time.
The first method (recommended). In the beginning of measurement the DE should
be reset using the keys or the PC and the user software supplied on CD. Then the dose
displayed at the end of the period will be the dose accumulated over the period of
measurement.
The second method. The dose value in the beginning of the period of
measurement should be deducted from the DE value displayed at the end of the period.
In the DE mode the indication (figure 1.2 display (3) and (4)) of values of time
remaining for staying at the working place depending on the current measured DER and
DE values is possible. Calculation of time is performed relative to the second preset DE
threshold (the function may be switched on at the DE measurement mode configuration).
2.4.5 Settings mode
Auxiliary mode of settings (figure 2.4) is meant for verification and (or) setting of the
threshold DE (DER) values, DE and DE accumulation time reset.
Attention! To enter the “set” mode press and hold for about 5 s the
LIGHT/SET button and the parameter to be set will be flashing.
To chose the parameter press and release the LIGHT/SET button.
To change the set parameter:
- rapidly – press and hold the MODE button;
- for exact setting – press and release the MODE button.
The dosimeter will exit the “set” mode by pressing and holding the LIHGT/SET
button or automatically in approximately 90 s.
Inputting the DER (DE) threshold levels into the memory
This procedure can be performed in the DER (DE) measurement mode as well as in
the mode of data transmission to PC. DER (DE) thresholds are inputted during DER (DE)
measurement on the LCD.
Enter the settings mode by pressing and holding the LIHGT/SET button (figure 2.4).
Input successively the first and then the second threshold levels.
Exit the set mode.
In the mode of data transmission to PC it is possible to set an inhibit for changing
the threshold levels using the buttons.
In case of exceeding the value of the first (second) DER (DE) threshold the
dosimeter turns correspondingly into the DER (DE) measurement mode and
noncontinuous (frequent noncontinuous) audible signal will sound.
When DER value decreases below the preset threshold, the audible signal will shut
off. Press any button to silence the alarm sound. The audible signal will shut off
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