RDS-200 Survey Meter
RDS-200 UNIVERSAL SURVEY METER
USER’S GUIDE
DOC.NO 2096 4388, ISSUE 1.5
Document No. 2096 4388 Ver 1.5
Copyright © RADOS Technology Oy 1998-2000
This document and the information herewith are copyrighted material as
mentioned in the Copyrights Act. No part of this document may be copied
without written authorization from the manufacturer.
The manufacturer withholds the right to make changes in the contents of this
document without prior notice.
CONTENTS
1. INTRODUCTION ................................................................................... 1
1.1. Range of Use .................................................................................. 1
1.2. Taking the Meter in Use .................................................................. 1
2. USER INTERFACE ............................................................................... 2
2.1. Front Panel Controls ....................................................................... 2
2.2. Display............................................................................................. 2
2.3. External Device Interface ................................................................ 4
3. FUNCTIONS .......................................................................................... 4
3.1. Clearing the Accumulated Dose...................................................... 4
3.2. Display Illumination ......................................................................... 5
3.3. Pulse Indication ............................................................................... 5
3.4. Muting an Alarm .............................................................................. 5
3.5. Dose Rate Display Time Constants ................................................ 5
3.6. Dose Display ................................................................................... 7
3.7. Cov-Display ..................................................................................... 7
3.8. Alarm Thresholds ............................................................................ 7
3.8.1. Setting the Dose Rate Alarm Threshold ................................... 8
3.8.2. Dose Rate Alarm ...................................................................... 9
3.8.3. Setting the Dose Alarm Threshold............................................ 9
3.8.4. Dose Alarm............................................................................. 10
3.8.5. Simultaneous Dose Rate & Dose Alarm ................................ 10
4. OTHER FUNCTIONS .......................................................................... 10
4.1. Sample Memory ............................................................................ 10
4.2. Printing the Dose Rate Readings .................................................. 10
4.3. Print Format................................................................................... 11
5. EXTERNAL GAMMA PROBE.............................................................. 12
6. EXTERNAL BETA PROBE.................................................................. 13
6.1. Pulse Indication ............................................................................. 13
7. ACTIVITY MEASUREMENT WITH AN EXTERNAL BETA PROBE... 14
7.1. Starting Up the Measurement ....................................................... 14
7.2. Setting the Measurement Time ..................................................... 14
7.3. Starting and Stopping the Measurement....................................... 15
8. ATTACHING A PC............................................................................... 15
9. ALARMS AND ERROR CODES ......................................................... 16
10. AUXILIARY ALARM DEVICES .......................................................... 17
11. CONNECTORS ................................................................................. 18
12. CONFIGURATION............................................................................. 19
13. SPECIFICATIONS ............................................................................. 21
1
1. INTRODUCTION
This manual is a description of the functions of the RDS-200 Universal
Survey Meter with program version V1.0X. The program version can be
checked at start-up when the program version number is displayed at the
bottom of the display.
1.1. Range of Use
The RADOS RDS-200 is a portable radiation meter for general use.
Because of its versatile functions and durability it is suited for a wide
range of applications in military, civil defense, industrial and laboratory
use etc.
An external gamma probe can be attached to the RDS-200. An external
pulse measurement beta probe can be used for activity measurements. A
printer can be used to print out the measurement results.
The RDS-200 can also be used as a measurement unit with the RADOS
AAM-90 Area Monitoring System.
1.2. Taking the Meter in Use
The RDS-200 uses three size IEC LR6 (AA) alkaline batteries. It is also
possible to use normal dry cells or rechargeable batteries, but this
shortens the operation time, especially in cold conditions. Also, the drycell batteries may leak as they run out of power. The battery case cover is
located at the bottom end of the meter. The cap is slotted, easing the
opening e.g. with a coin. (The cap includes also a thread for connection
on a camera tripod.) Fresh batteries are inserted positive (+) pole first. It
is also possible to use external +12V DC power supply with a special
adapter.
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2. USER INTERFACE
2.1. Front Panel Controls
The front panel controls consist of the following:
On/Off
Display Illumination
Dose Rate, slow time constant
Dose
Alarm
2.2. Display
The analog bargraph display is logarithmic and covers four decades
(0.1… 1000 µSv/h) and a unit display. If dose rate is higher than
999
µSv/h, the unit segment (µSv/h, mSv/h or Sv/h) after the digital dose rate
starts blinking. One bar equals to a change of 30%. The display is used to
display the dose rate, its alarm threshold, and pulse rate, the latter with
the range of 1 – 10000 cps. The time constant of the bargraph is fast (0.5
sec), enabling the observation of rapid dose rate changes.
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The larger numeric display is used for displaying the dose rate, the dose,
setting the alarm thresholds and displaying the number of pulses. In
addition the larger numeric display shows the status of the meter (OFL,
DEF). The dose rate and dose display places the decimal point
automatically and displays the unit of measurement (µSv/h, mSv/h and
Sv/h; or µSv, mSv and Sv). Units mSv/h, Sv/h, mSv and Sv are blinking
when in use. Two different time constants can be selected for the dose
rate display (see 3.5 Dose Rate Display Time Constants). In pulse rate
mode the display has automatic decimal point and unit (cps, kcps)
selection.
The smaller numeric display is used for displaying the error codes.
Note that the unit "rem" is indicated as "R" on the display.
The display also contains the following symbols:
ALARM (Used in dose and dose rate alarms.)
PULSE INDICATION
BATTERY (Indicates a battery alarm.)
SETTINGS (Used in setting the alarm thresholds.)
SNAIL (Indicates the dose rate display’s slow time
constant. See Chapter 3.5.)
METER, ARROW and BETA (Beta probe attached.)
METER AND ARROW (Gamma probe attached.)
METER AND ARROW (Printing.)
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2.3. External Device Interface
The meter has an interface for external gamma probes or for a beta
probe. There is also a connector for the attachment of the meter to a PC
with software like RADOS AAM-95 Area Monitoring System. The
connectors are located at the bottom part of the meter. The connectors
are equipped with protective covers. When the connectors are not in use,
the covers should be kept in place.
3. FUNCTIONS
The meter is turned on by pressing the POWER switch. Note that the
switch must be pressed for about one second for the meter to switch on.
The meter is also turned off by pressing the POWER switch again for
about one second. When the meter is turned on, all segments of the
display are turned on and off so that the proper functioning of the display
may be verified.
Following functions can be done with the keyboard:
1. Clearing the accumulated dose
2. Illuminating the display
3. Setting the pulse indication on and off
4. Muting a dose or dose rate alarm signal
5. Selecting the integration time of the dose rate display,
(1.5 s/ 1...99 min)
6. Selecting the dose display
7. Changing alarm threshold
3.1. Clearing the Accumulated Dose
The total accumulated dose is the dose that has accumulated since the
dose was last reset. The dose does not clear even when the power is
switched off or the batteries are removed. The dose can however be
cleared when the power is switched on. This can be done by pressing the
DOSE button when the text 'Clr DoS' with blinking Clr appears on the
display.
The text 'Clr DoS' is shown on the display for five seconds after the meter
is turned on. If you do not want to clear the dose you can press the DOSE
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RATE button. If none of the keys is pressed, the dose is restored after a
waiting time of 5 seconds.
3.2. Display Illumination
The display illumination is turned on by pressing the DISPLAY
ILLUMINATION switch. The display illumination will be on for as long as
the button is pressed.
3.3. Pulse Indication
Pulse indication emits short beeps, whose frequency is proportional to the
dose rate. With the help of the pulse frequency it is easy to note any
changes in the dose rate, without having to keep an eye on the display all
the time. The useful range of the pulse indication is approximately 1… 100
µSv/h corresponding to 0.5… 50 pulses/s.
The pulse indication is turned on by pressing the ALARM button; the
PULSE INDICATION symbol appears on the top left hand corner of the
display. To turn off the pulse indication, press the ALARM button again;
the PULSE INDICATION symbol disappears.
3.4. Muting an Alarm
If the set dose or dose rate alarm thresholds are exceeded (see 3.8 Alarm
Thresholds), the ALARM symbol starts to blink on the display,
simultaneously the meter emits an audible alarm. If external devices are
connected to the meter, the meter will emit also an external audible alarm.
The alarm may be muted with the ALARM button. Muting the alarm
switches the alarm sound off. The ALARM symbol remains on the display
until the alarm thresholds are no longer exceeded.
3.5. Dose Rate Display Time Constants
Because of the random nature of radiation, large variations may occur in
the dose rate readings of the meter, especially at low dose rates. These
variations are smoothened in the dose rate numeric display by integrating
the readings. Thus the displayed reading is a mean value of the readings
over a longer period and the variation is lessened. The time constant of
integration represents the degree of the integration, i.e. its smoothening
effect. A higher time constant means that the reading is a mean value for
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a longer period and thus the variations on the display are smaller. Two
time constants, slow and fast, may be chosen for the dose rate display. In
normal use the fast time constant is used.
After the meter is turned on the time constant is set at fast. To change to
the slow time constant, press the DOSE RATE button. As a sign of the
long time constant the SNAIL symbol appears on the display and there
will be a text '1...99 m' on the smaller numeric display. The slow time
constant is active as long as the button is pressed. To change back to the
fast time constant, release the DOSE RATE button. The SNAIL symbol
and the text '1...99 m' disappear from the display.
The integration time can be set between 1… 99 minutes. The long time
average of the dose rate is displayed and updated every 30 seconds.
Before the first average of the dose rate the symbol ‘- - - ‘is shown on the
display.
Note that although the display is updated every 30 seconds, the sampling
rate is the set 1… 99 min. Thus the slow time averages of the dose rate
are stored in the internal memory of the meter within the set integration
time of 1… 99 min. Maximum of 864 averages are stored.
Time Constants of Display Sections
Display Section
Time Constant
Analog bargraph
0.5 s
Numeric display,
fast time constant
1.5 - s
Numeric bargraph,
slow time constant
1...99 min
Algorithm
Other terms
Integration of pulses of
the last 0.5 seconds
7/8 x old dose rate +
1/8 x new dose rate
Integration of pulses of
the last 1...99 minutes
if new dr < 0.3 uSv/h,
dr = the average of
previous and present
dose rates
Slow Time Constant
The measurement interval can be set by serial communication.
Note! If the RDS-200 meter’s ID is set to 0 (zero), the slow time constant
will change back to the default value of 5 minutes, after the power has
been switched off and on.
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3.6. Dose Display
To change to the dose display, press the DOSE button. The accumulated
dose can be seen on the larger numeric display. On the smaller numeric
display there will be a text 'DoS' indicating dose display. To change back
to the dose rate display, release the DOSE button.
3.7. Cov-Display
The coefficient of variation display (‘CoV’) can be activated by serial
communication. The value of 'Cov' is shown on the display below the
dose rate value. The 'Cov' is displayed as %. The range is 0 - 99%. The
value of 'Cov' is calculated as
n-1
n
x 100%
where 'n' represents the number of pulses from the GM tube.
3.8. Alarm Thresholds
Two dose rate alarm thresholds and one dose alarm threshold may be set
in the meter. The default value of the first alarm thresholds is 100
µSv/h. The other two thresholds (0 µSv/h and 0 mSv) are not active. The
default values can be changed freely between 0 - 999 mSv/h and
0999 mSv with a PC.
If the dose or the dose rate values reach the thresholds, the meter will
sound an alarm. The alarm thresholds can be changed from preset
menus. Both thresholds can be set and removed independently.
The alarm thresholds are set in a special threshold setting mode, where
the threshold is selected from a menu by stepping up or down with the
DOSE RATE and DOSE buttons. To enter the threshold setting mode
press the ALARM and DOSE RATE buttons (for dose rate alarm
threshold setting) or the ALARM and DOSE buttons (for dose alarm
setting) together for two seconds. The meter returns to the operating
mode, if no button has been pressed within the last 10 seconds.
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3.8.1. Setting the Dose Rate Alarm Threshold
Enter the threshold setting mode by pressing the ALARM button and
DOSE RATE button for two seconds. The SETTINGS symbol appears on
the display, and dose rate display digits start to blink. Now you can
choose the alarm threshold from the preset menu. The DOSE RATE
button steps down the menu and the DOSE button steps up the menu. To
step faster, hold the DOSE RATE or DOSE buttons down longer. The
possible alarm threshold values are: 0.10, 0.20, 0.30, 0.40, 0.50, 0.60,
0.70, 0.80, 0.90, 1.00, 2.00, 2.50, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00,
10.0, 20.0, 25.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100, 200, 250,
300, 400, 500, 600, 700, 800 and 900 µSv/h, and 1.00, 2.00, 2.50, 3.00,
4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.0, 20.0, 25.0, 30.0, 40.0, 50.0, 60.0,
70.0, 80.0, 90.0, 100, 200, 250, 300, 400, 500, 600, 700, 800 and 900
mSv/h.
To clear the alarm threshold set the value at 0.00. The menu does not
scroll around, i.e. you cannot step directly from the smallest value to the
highest by pressing the DOSE RATE button or vice versa.
When the dose rate alarm threshold has been selected, it is activated by
exiting the threshold setting mode. The threshold setting mode may be
exited either by waiting for the 10 seconds or by pressing the ALARM
button.
Note that the selected alarm thresholds are active, but depending on the
configuration they either are or are not stored on EEPROM. If the alarm
thresholds are not stored on EEPROM, they are valid as long as the
meter is on. After the meter has been turned off, the default values are
restored.
The set threshold is displayed on the analog display as a bar, if the
threshold is set within the range of the scale displayed.
The active alarm threshold level can always be checked by pressing the
ALARM and DOSE RATE buttons simultaneously and then exiting the
mode after 10 seconds.
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3.8.2. Dose Rate Alarm
If the dose rate alarm threshold is met, the ALARM symbol starts to flash
on the display and the meter emits an audible alarm signal.
The alarm signal is a FAST SERIES OF BEEPS. The signal stops when
either the alarm condition is no longer met or the alarm is muted by
pressing the ALARM button. The alarm begins again, if the meter is
restarted with the POWER switch and the alarm condition is still met.
The flashing ALARM symbol on the display is not cleared from the
display, before either the dose rate falls below the threshold or the
threshold is changed to a higher one above the current dose rate value.
3.8.3. Setting the Dose Alarm Threshold
Enter the threshold setting mode by pressing the ALARM and DOSE
buttons for two seconds. When the SETTINGS symbol appears on the
display the dose display digits start to blink. Now you can choose the
alarm threshold from the preset menu. The DOSE RATE button steps
down the menu and the DOSE button steps up the menu. To step faster,
hold the DOSE RATE or DOSE button down longer. The possible
numeric values are the same as in the dose rate threshold setting (the
corresponding units being µSv and mSv). To clear the alarm threshold set
the value at 0.00. The menu does not scroll around. When the dose alarm
threshold has been selected, it is activated when the user exits the
threshold setting mode. The threshold setting mode may be exited either
by waiting for 10 seconds or by pressing the ALARM button once.
Note that the selected alarm thresholds are active, but depending on the
configuration they either are or are not stored on EEPROM of the meter,
when exiting the alarm threshold mode. If they are not stored on the
EEPROM, they are valid only as long as the meter is on. After the meter
has been turned off, the default values are restored.
The active alarm threshold level can always be checked by pressing the
ALARM and DOSE buttons simultaneously and then exiting the mode
after 10 seconds.
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3.8.4. Dose Alarm
If the dose alarm threshold is met, the ALARM symbol starts to flash on
the display and the meter emits an audible alarm signal. The dose alarm
signal is a SLOW SERIES OF BEEPS. The signal stops when either the
dose limit is changed or the alarm is muted by pressing the ALARM
button. The alarm begins again, if the meter is restarted with the POWER
switch and the alarm condition is still met. (Dose is not cleared.)
The flashing ALARM symbol on the display is not cleared from the display
until the alarm condition is no longer met, i.e. when the accumulated dose
is cleared or when the alarm threshold is changed to a higher one above
the current dose reading.
3.8.5. Simultaneous Dose Rate & Dose Alarm
If both the dose rate and the dose alarm thresholds are met at the same
occasion, the ALARM symbol starts to flash on the display and the meter
emits an audible alarm signal.
The alarm signal is a CONTINUOUS, NOT INTERMITTENT BEEP. If one
of the two alarm conditions is no longer met, the alarm signal changes
accordingly.
4. OTHER FUNCTIONS
4.1. Sample Memory
The dose rate averages of 1...99 minutes are collected in the so called
sample memory. The sample memory capacity is 864 dose rate readings.
The dose rate readings are cleared, when the meter is switched off.
4.2. Printing the Dose Rate Readings
At any time the readings already stored may be printed on a printer or be
downloaded to a computer (see Chapter 8. Attaching a PC). In addition to
the readings, also the highest, the lowest and the mean dose rate values
are printed.
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To start printing the dose rate readings press the DOSE RATE and the
DOSE buttons simultaneously. During the printing the METER symbol is
displayed, along with an ARROW pointing away from the METER symbol.
Note that during printing the dose and dose rate are not calculated.
However, the pulse indication is operating, if it was switched on before
starting the printing.
4.3. Print Format
In the printout the sample memory locations are divided into groups of
five, starting from the first location. Each group is printed on a separate
line. One line consists of the number of the first memory location and five
dose rate samples. If one of the memory locations of the group does not
contain a value, a dash is printed in its place.
In addition to the dose rate readings, the printout contains a header text,
the time interval of the automatic sampling, the reading unit (microSv/h or
millirem/h), the number of readings, the mean and the greatest and
smallest values.
Following is an example of a printout:
RDS-200
V 1.00 PRINTOUT
TIME INTERVAL: 5 MIN
DOSE RATE UNIT: microSv/h
NUMBER:
1
6
11
16
21
26
31
36
SAMPLES
0.10
19190
6.72
287
151
768
195
0.14
0. 10
10363
106
137
325
255
195
-
0. 10
0. 21
172
1.20
343
293
1.54
-
11. 2
0.16
112
0.22
0.27
312
1.17
-
50592
1.57
945
0.16
1344
311
0.39
-
AVERAGE OF 36 SAMPLES:
2400
MIN:
3
0.10
MAX:
5
50592
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5. EXTERNAL GAMMA PROBE
External gamma probes, type GMP-12 (RADOS cat. no. 1233-183), GMP12XL (RADOS cat. no. 1233-197), GMP-12L (RADOS cat. no. 1233-190)
and GMP-12H (RADOS cat. no. 1233-191) can be used with the meter.
The probes are attached to the interface connector at the bottom part of
the meter. The meter automatically recognizes the probe when it is
attached to the meter.
During the recognition all display segments are switched on. When the
probe has been recognized the meter indicates it by sending short audible
beep signals and a METER symbol with an ARROW pointing towards the
meter appears down in the bottom left-hand corner of the display.
Audible signals:
three short beeps
two short beeps
one short beep
GMP-12 or GMP-12XL recognized
GMP-12L recognized
GMP-12H recognized
The functions of the meter with the external gamma probe are congruent
with its functions with the internal gamma detectors (see chapters 3 and
4) except for cases mentioned later on.
The useful range of pulse indication is about 0.05 uSv/h...5 uSv/h
(0.5 urem/h...500 urem/h), when using the GMP-12XL sensor. With
the GMP-12 and GMP-12L sensors the useful range of pulse indication
is about 0.25 uSv/h...25 uSv/h (25 urem/h...2.5 mrem/h). With the GMP12H sensor the useful range of pulse indication is about
10
uSv/h...1 mSv/h (1 mrem/h...100 mrem/h).
If the external gamma probe is in use and error codes Er5, Er6 or Er7
appear on the display, the error codes are due to the GM tubes of the
external gamma probe. (See chapter 9.)
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6. EXTERNAL BETA PROBE
An external beta probe, type GMP-11 (RADOS cat. no. 1233-122) or
GMP-15 (RADOS cat. no. 1233-176) can be used with the meter. The
probe is attached to the interface connector at the bottom part of the
meter.
The meter automatically recognizes the probe. When the probe is in use
the METER symbol is shown on the display, with an ARROW pointing
toward the symbol, and a BETA symbol next to the ARROW, both below
the METER.
In the beta measurement mode the meter displays the results as pulses
per time unit. The displayed unit is either pulses per second, “CPS”, or
one thousand pulses per second, “kCPS”. The unit is chosen
automatically.
Note that with an external probe the results cannot be printed out.
6.1. Pulse Indication
Pulse indication can also be used with the beta probe. Each pulse is
indicated by a short beep. The pulse frequency corresponds to the level of
radiation. Any changes in the level of radiation can be quickly noted from
the frequency of the pulses, without having to keep an eye on the display
all the time.
The useful range of the pulse indication is about 0.5-50 pulses/s.
To turn the pulse indication on, press the ALARM button. The PULSE
INDICATION symbol appears in the top left-hand corner of the display.
To turn the pulse indication off, press the ALARM button again. This also
clears the PULSE INDICATION symbol from the display.
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7. ACTIVITY MEASUREMENT WITH AN EXTERNAL
BETA PROBE
With an external beta probe it is possible to measure the activity levels of
e.g. foodstuff or equivalent samples. The meter calculates the total
number of counts from the probe over a determined period of time.
The beta probe is connected to the interface at the bottom part of the
meter.
In the foodstuff activity measurement the probe is placed in a container.
The measurements are done with an empty container, and with a known
sample of foodstuff. The sample’s activity level can be estimated from the
results. When more accurate results are needed, the probe has to be
calibrated in standard geometry for each separate isotope.
The meter displays the result as total counts. If the number of counts
exceeds the value of 999 the display changes to display thousands of
counts, indicated by a “k” after the number. If the display exceeds 999
thousand counts, the display will indicate an overflow by showing “OFL”.
In such a case the pulse counting is interrupted.
7.1. Starting Up the Measurement
To start the measurement, switch the meter into the measurement mode
by pressing the DOSE and DOSE RATE buttons simultaneously. The
smaller numeric display starts to flash “060 m”.
If pulse indication is needed, it has to be turned on before switching to the
measurement mode (see 6.1 Pulse Indication).
7.2. Setting the Measurement Time
When the meter is in the measurement mode the measurement time can
be chosen. The measurement time flashes on the smaller numeric
display. The default value is 60 minutes, which can be seen on the display
as “060 m”. The measurement time is chosen from a preset menu. The
DOSE RATE button steps down the menu and the DOSE button steps
upwards. Possible values for the time are: 15, 30, 60, 90 seconds, 6, 10,
15, 30, 45, 60, 90, 120, 180, 240, 300, 360, 420, 480,
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720 and 960 minutes. The periods indicated in minutes correspond to 0.1,
0.167, 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 12 and 16 hours. ‘Minute’
is abbreviated “m” in the display. Seconds are displayed without a unit
mark.
After the measurement time has been chosen, the measurement may be
started.
7.3. Starting and Stopping the Measurement
To start the measurement, press the ALARM button.
During the measurement the larger numeric display shows the number of
pulses stored and the smaller numeric display shows the remaining
measurement time. The measurement stops automatically after the
measurement time has elapsed, and the meter emits a long audible
signal. After the measurement the larger numeric display shows the total
number of counts and the smaller numeric display flashes the time that
was used for the measurement.
If you want to repeat the measurement press the ALARM button. The
meter switches again over to the measurement time selection. The
default value is the same that was used in the previous measurement.
To exit from the measurement mode switch the power off.
8. ATTACHING A PC
The RDS-200 meter is attached to a PC with a Data Transfer/ Alarm
cable (RADOS cat. no. 1233-202). The cable can be attached also to a
printer equipped with a serial RS 232C interface. Connector adapters may
be needed when connected to the printer.
The interface parameters of the meter are as follows:
–
–
–
–
Data transfer rate
Data length
Parity
Handshake
300 Bd or 1200 Bd, set by PC
8 bits
no
no
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9. ALARMS AND ERROR CODES
The alarms are indicated with the display symbols and audible beep
signals. The possible alarms are:
– Dose rate alarm (a flashing ALARM symbol and a fast intermittent
sound signal).
– Dose alarm (a flashing ALARM symbol and a slow intermittent sound
signal).
– Battery alarm when at least 5 hours of operating time in background
radiation level left (long sound alarm when the alarm first appears,
and after it the BATTERY symbol is shown on the display).
– Battery alarm when no more power to operate (a continuous sound
alarm and the display is turned off.
The error codes are displayed on the smaller numeric display. The error
codes are blinking. The possible error codes and the corresponding errors
are as follows:
– Er0; dose rate of 10 Sv/h has been exceeded.
Dose may be under estimated.
– Er1; an incorrect calibration coefficient (the meter has not been
calibrated)
– Er2; the dose and parameter memory’s checksum incorrect (faulty
memory)
– Er3; the total dose over 10 Sv (the meter must be serviced)
– Er4; not in use
– Er5; the more sensitive GM tube is not sending pulses (the tube is
faulty)
– Er6; the less sensitive GM tube is not sending pulses (the tube is faulty)
– Er7; neither one of the GM tubes is sending pulses (both of the tubes
are faulty or the voltage of the tubes is missing)
– Er8; incorrect program memory checksum (the memory is faulty)
– Er9; operation error in the sample memory (the memory is faulty)
If the meter has several errors, the corresponding error messages
alternate on the display. An audible alarm is sounded along the error
messages. With the codes Er7, Er8 and Er9 the sound is continuous
(measurements cannot be performed). With the other codes the sound
is a short, infrequent beep.
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The other status messages are displayed on the larger numeric display
(dose rate display). The possible messages are as follows:
−
−
−
−
Dose rate overflow:
OFL (overflow, alternates with the dose rate display when in the
range of 10… 40 Sv/h, continuously on the display in the range of
40… 100 Sv/h)
Dose rate overflow at low energies:
OFL (when the radiation energy is in the range of 50 keV...70 keV
and the dose rate is over 10 mSv/h)
Dose overflow:
OFL on the larger numeric display and Er3 on the smaller numeric
display indicating that the total dose is over 10 Sv
Faulty meter:
DEF (the meter is faulty, situations in which the measurements
cannot be performed: error codes Er7, Er8 and Er9)
10. AUXILIARY ALARM DEVICES
Auxiliary alarm devices can be connected to the RDS-200 meter with a
Data Transfer / Alarm cable (RADOS cat. no. 1233-202). The cable is
equipped with a connector to the RDS-200 meter and with a Dconnector.
To connect an auxiliary alarm device open the shell of the D-connector.
Solder extra wires to the brown wire and to the black wire. If the
Dconnector is going to be used with a PC, do not disconnect the black
wire from the D-connector pin. Put insulating tape around the solder
points to prevent short circuit. Close the D-connector shell.
The wires are connected as follows:
Brown:
Open collector output.
When alarm is activated, output will sink current max. 100 mA,
voltage typ. 0.2 V above ground.
When alarm is not activated, current sink is 0 (or OFF).
Maximum allowed voltage at this output is +24 V DC above
ground.
Black:
Ground, negative battery voltage.
Doc.no 2096 4388 ver. 1.5
18
D-connector
RDS-200
Brown
AUXILIARY
ALARM
DEVICE
*)
Black
12Vdc
*) Use protective diode (e.g. 1N4935 or equivalent) right across
the alarm device, if the alarm device is an inductive load (e.g.
relay or magnetic buzzer).
Notice that the RDS-200 meter itself does not supply power to the
auxiliary alarm device, thus an external DC voltage supply (typically
12
V) is needed. The auxiliary alarm is activated in case of lower dose rate
alarm or error codes Er0...Er9.
11. CONNECTORS
The RDS-200 has the following connectors:
PC/ Alarm Connector:
1. Hirschmann
2. Binder Series 718
type: ELST 4408 RV FM8 05
type: 09-3391-00-04
External Probe Connector:
1. Souriau
2. Amphenol
type: 851 02E 10-6S50
type: 62GB-12E10-6S
Doc.no 2096 4388 ver. 1.5
19
12. CONFIGURATION
The configuration of meter can be set by the U command. The
communication parameter, one HEX-ASCII-character, consists of four
bits. Parameter value ranges from '00' to 'FF' corresponding to bit values
0000 0000b ... 1111 1111b. (Hex characters 0 ...9, A...F are in use, note
that A...F are all capital letters.)
Meaning of the bits; b7 b6 b5 b4 b3 b2b1b0:
Bit
Function
Configuration
Default
0
Communication speed
0 = 300 Bd
1 = 1200 Bd
1
1
Chirp on/off
0 = off
1 = on
1
2
Analog display
0 = Only unit uSv/h in use (max display
1000 uSv/h)
1 = Units uSv/h, mSv/h and Sv/h in use
(automatic scale)
1
3
Push buttons (on/off and
display illumination
always enabled)
0 = disabled
1 = enabled
1
4
Dose rate alarm
0 = Alarm according to the short time dose
rate
1 = Alarm according to the average dose
rate
0
5
Auxiliary alarm connection 0 = with Data Transfer / Alarm Cable
1 = with CB-200 Connection Box
0
6
Restore original alarm
thresholds
0
7
Low power mode (RS-232 0 = off
driver powered only
1 = on
during communication)
0 = disabled
1 = enabled
1
20
Command line for default configuration is #10*0*U*8F*01AB
The unit can be changed by command Z. This message has two
parameters (characters). The parameters are as follows:
‘R’= Rem
‘S’= Sievert
‘C’= Cov (coefficient of variation) display enabled
‘N’= Cov display disables
Possible combinations are as follows:
#10*0*Z*SN*01D3
#10*0*Z*SC*01C8
#10*0*Z*RN*01D2
#10*0*Z*RC*01C7
(Sievert-unit and measurement without Covdisplay)
(Sievert-unit and measurement with Cov-display)
(Rem-unit and measurement without Cov-display)
(Rem-unit and measurement with Cov-display)
Doc.no 2096 4388 ver. 1.5
21
13. SPECIFICATIONS
Radiation detected:
Gamma and x-rays, 50 keV… 3 MeV. Beta
radiation with an external probe.
Detectors:
Two energy-compensated GM tubes. Energy
response according to the ambient dose
equivalent.
Dose rate
measurement range:
0.01 µSv/h… 10 Sv/h or 1 µrem/h...1000 rem/h
Dose
measurement range:
0.01 µSv … 10 Sv or 1 µrem...1000 rem
Resolution:
Three significant digits or 0.01 Sv/h on dose
rate and 0.01 µSv on dose. Alternatively three
significant digits or 1 µrem/h on dose rate and
1 µrem on dose.
Calibration accuracy:
<± 5%, Cs 137 reading along the calibration
direction and in the calibration field,
temperature +20 °C.
Dose rate linearity:
< ± 15% ± least significant number, in the
range of 0.05 µSv/h… 10 Sv/h or
5 µrem/h...1000rem/h
Response dependence
on radiation direction:
± 25%, within ±45 degrees from the calibration
direction, test energy 65 keV, within the range
of 0.05 µSv/h...10 mSv/h or 5 µrem/h...1 rem/h
± 35%, within ±45 degrees from the calibration
direction, test energy 83 keV, within the range
of 10 mSv/h… 10 Sv/h or 1 rem/h...1000rem/h
22
Energy range:
50 keV… 3 MeV, within the range of
0.05 µSv/h … 10 mSv/h or 5 µrem/h...1 rem/h
80 keV… 3 MeV, within the range of
10 mSv/h… 10 Sv/h or 1 rem/h...1000 rem/h
Note that at energy levels between
50… 80 keV overflow messages are given, if
measurement range limit 10 mSv/h or 1 rem/h
are exceeded.
Response dependence
on radiation energy:
-20%… +30 %, within the range of
0.05 µSv/h… 10 mSv/h or 5 µrem/h...1 rem/h
± 15%, within the range of 10 mSv/h… 10 Sv/h
or 1 rem/h...1000 rem/h
Temperature range:
-30°C… +55°C, operating
-40°C… +55°C, operating (restricted display
operation)
-40°C… +70°C, storage
Power supply:
3 alkaline batteries (IEC LR6), +12 V DC
external battery adapter (optional) or AC
adapter (optional)
Battery life:
200 h in background field (+ 25 °C)
Battery alarm:
15 h before battery power-out
Overflow indication:
OFL displayed
Error diagnostics:
Continuous checking of electronics and GM
tubes operation (10 error codes).
Casing:
Impact resistant, aluminium profile body with
ABS plastic end caps, enclosure class IP67
(IEC 529), shielded against RF interference
and NEMP.
Dimensions:
92 x 199 x 44 mm
Weight:
610 g without batteries
700 g with batteries
Doc.no 2096 4388 ver. 1.5
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