Mirion Technologies RDS-31iTx S User manual

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RDS-31iTx S/R
Multi-purpose Survey Meter
User Manual
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Doc.No.20966891
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Ver.1.11

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NOTE
This document and the information herewith are copyrighted
material as mentioned in the Copyrights Act. No part of this
document may be copied without a written authorization from the
manufacturer.
The manufacturer withholds the right to make changes in the
contents of this document without prior notice.
If you have any comments or suggestions for additions
concerning either the products or this document, please send
them to the address on the back cover. There is a feedback form
at the end of this document.
ATTENTION! The RDS-31iTx Multi-purpose Survey Meter does not
contain any hazardous or dangerous substances and can be
recycled accordingly. The batteries of the device must be recycled
separately as instructed by the manufacturer of the batteries.
Copyright © Mirion Technologies (RADOS) Oy 2014
Document No. 2096 6891
Version 1.11
Issue date 24.4.2014

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Table of Contents
1.Introduction ............................................................................. 1
1.1RDS-31iTx S/R Multi-Purpose Survey Meter......................................1
2 Taking the Instrument into Use for the First Time.................... 2
2.1Inserting Batteries ........................................................................2
2.2 Switch On....................................................................................4
2.3 Switch Off (OFF)...........................................................................4
3 Main Parts of the RDS-31iTx..................................................... 4
3.1Display of the RDS-31iTx ...............................................................4
3.2Connectors and Strap....................................................................6
3.3Push Buttons................................................................................6
4Using the Buttons and Special Features ................................... 7
4.1Button Pressing Times...................................................................7
4.2Normal Usage of the Buttons..........................................................8
4.3Special Feature: Shortcut-Function..................................................8
5Operation ................................................................................. 9
5.1Indication of the Measuring Unit....................................................10
5.2Display Illumination ....................................................................10
5.3Operating the Instrument Menu ....................................................11
5.4Menu Items................................................................................11
5.4.1ShowandResetCumulativeDose(DOSE)...............................................................12
5.4.2MaximumMeasuredDoseRate(MaxDR)...............................................................12
5.4.3ChirpOffandSettingDivisor(CHIRP).....................................................................13
5.4.4ShowandChangeDoseRateAlarmLevel(FX.RAL/SQ.RAL)...................................14
5.4.4.1Fixed Dose Rate Alarm Level:.............................................................15
5.4.4.2Sequential Dose Rate Alarm:...............................................................16
5.4.5ShowandChangeDoseAlarmLevel(FX.DAL/SQ.DAL)..........................................17
5.4.5.1Fixed Dose Alarm Level:........................................................................17
5.4.5.2Sequential Dose Alarm:.........................................................................19
5.4.6TimetoDoseAlarm(TM.2.AL)................................................................................20
5.4.7Diagnostics(DIAG)...................................................................................................21
5.4.8Communication(CONN)..........................................................................................23
5.4.9Histogram(HISTO)...................................................................................................25
5.4.9.1Other Histogram Records......................................................................29
5.4.10WRM Communication (WRM)....................................................30
5.5Shortcut Functions......................................................................30
5.6Other Displayed Messages............................................................33
5.6.1LowBatteryWarning...............................................................................................33
5.6.2LowBatteryAlarm...................................................................................................34
5.6.3DoseRateAlarm(BlinkingDisplay).........................................................................34

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5.6.4DoseAlarm..............................................................................................................34
5.6.5DoseRateOverflowAlarm(OFL)............................................................................34
5.6.6Error(dEF/Err).........................................................................................................34
6Configurable Parameters ........................................................ 35
6.1Display Illumination ....................................................................35
6.2Show and Reset Cumulative Dose (DOSE)......................................36
6.3Chirp On/Off and Chirp Rate (CHIRP).............................................36
6.4Show and Change Dose Rate Alarm Level (FX.RAL/SQ.RAL)..............36
6.5Show and Change Dose Alarm Level (FX.DAL/SQ.DAL).....................37
6.6 Time to Dose Alarm (TM.2.AL).......................................................37
6.7Battery and Display Test (DIAG) ...................................................37
6.8Histogram (HISTO) .....................................................................38
6.9 WRM transmission........................................................................39
6.10 Indication Unit...........................................................................39
7Maintenance and Decontamination......................................... 39
8RDS-31iTx Specifications........................................................ 41
8.1Radiological Characteristics ..........................................................41
8.2Functional Characteristics ............................................................42
8.3Electrical Characteristics ..............................................................42
8.4Mechanical Characteristics............................................................42
8.5Environmental Characteristics.......................................................43
8.6Connector..................................................................................43
8.7Detector Position ........................................................................43
9Accessories ............................................................................ 44
External Probes for RDS-31 with Binder Connector.................................44
FEEDBACK FORM ............................................................................. 46
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1.Introduction
1.1 RDS-31iTx S/R Multi-Purpose Survey Meter
The new RDS-31iTx S/R Multi-purpose Survey Meter continues
the line of the Mirion survey meters offering modern design and
approach to a wide range of radiation monitoring applications.
RDS-31iTx is a small hand held, battery-operated survey
instrument utilizing an energy-compensated GM-tube as a
primary detector. It is suited for a wide range of applications in
civil defense, firefighting, rescue, industrial and laboratory use
due to its versatile functions and rugged construction. With the
accompanying Configuration Software, it is easy to optimize the
behavior of the instrument to meet the various working
conditions and needs. The menu functions, which are available
to the end user, can be selected from the bare essentials (back
light activation only) to functions allowing the alarm limit
setting, dose resetting and histogram functions configurations.
In other words, this meter has its place wherever the user
wishes to observe the ionizing radiation in his/her environment
or work surroundings.
RDS-31iTx features excellent ergonomics; it is lightweight and
easy to handle with visual and audible alarms and a built-in
vibrating alarm. The instrument can be held and handled firmly
even under difficult conditions thanks to the rubber grip around
the instrument. The large graphical display with an Energy Save
Backlight can be easily read both in total darkness and in direct
sunlight. Additionally, to increase the easy operation of the
instrument, Shortcut-operations can be configured to the
buttons. This function allows the easy and configurable method
of performing repeated operations such as the Manual Histogram
Sample collection, the Dose value display, the Diagnostics etc.
In addition, to help the users to become accustomed to the
Shortcut-function, a novel Visualization display function can be
configured into the operations. With this aid, it is possible to
adjust the button press to the desired length.

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The basic instrument is easy to take into use, but it also offers
versatile possibilities to measure other types of radiation
qualities by using external probes. The total Mirion range of
external probes from the Turku and Lamanon manufacturing
sites can be attached to the instrument.
These detectors include the GMP-xx-3 series of gamma and
alpha/beta/gamma probes and GMP-25 alpha/beta/gamma
probe dedicated to RDS-31, additionally the GMP-12 series
gamma probes and the GMP-11/GMP-15 alpha/beta/gamma
probes of Mirion Technologies (RADOS) Oy. In addition, the TGS
gamma contamination, Alpha Wound and Alpha 125 alpha
contamination probes from Mirion Technologies (MGP) of France
can be connected to RDS-31. These various detectors can be
added to the instrument using the additional Cable Adapter
extending the capabilities of the instrument. The use of the
Cable Adapter also provides existing customers an easy and cost
effective way to update their current instruments while
maintaining the existing external detectors.
The meter provides an additional protective function to the user:
while using external probes, the meter is still measuring
simultaneously the dose rate using the detector of the
instrument. This allows the alarm to be triggered in case a too
high dose rate or an accumulated dose is measured.
The RDS-31 is ready for use after the batteries (2 x IEC LR6/AA)
have been installed.
2 Taking the Instrument into Use for the First
Time
2.1 Inserting Batteries
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Open the lid of the battery compartment by releasing the fixing
screws with a Pozidriv #1 screwdriver and pull the cap out.
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The instrument uses two IEC (LR6/ HR6) AA-size batteries. The
use of alkaline batteries is recommended, but rechargeable NiMH
batteries can also be used.
The polarity of the batteries can be seen in the picture below.
It is also engraved in the bottom of the battery compartment.
Insert the batteries and secure the battery cap.
Close the battery cover and tighten the screws first by using a
lower torque and then by increasing the force until the lid
becomes aligned with the bottom. The surface of the lid is
slightly above the instrument bottom surface.
The instrument is now ready for use. If the instrument is not
automatically switched on after replacing the batteries, turn the
instrument on by pressing the On/Off-button [] until the
instrument starts (about 2s).
Note: The operation of the instrument is optimized for alkaline batteries.
The use of NiMH batteries is possible. When changing the battery type the
instrument settings must be changed with the Configuration Software for
RDS-31.
Note: When changing the batteries, also check that there is no dust or dirt
inside the battery compartment. Clean the compartment. Check the
condition of the rubber sealing and the connector cap. Replace the sealing
or the cap in case they have become damaged.
Note: Using excessive force while tightening the screws may damage the
threads of the instrument. Should this happen the case must be replaced.
Note: If the batteries have been totally depleted or the batteries are not
changed within one minute, the Internal Real Time Clock is reset and has to
be set again using the CSW-31 software.

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2.2 Switch On
Press the On/Off []button until all the display
pixels are turned on and an audible signal is
heard. The meter performs a self-test function:
All the display pixels are turned on
The buzzer is activated
The display backlight is switched on
The battery condition is tested
The HV-generator is tested
The presence of the RF link is checked and the connection is
established.
In case the internal Real Time Clock (RTC) is not set to the proper
time, a flashing ‘TIME NOT SET’ message is displayed. The RTC can
be set with the CSW-31 software.
2.3 Switch Off (OFF)
To switch the instrument off:
Activate the menu (Short [Ξ]).
The display changes to blinking OFF.
Press an intermediate []
The display goes blank. The instrument is now switched off.
Note: The instrument does not completely shut down all the internal
circuitry. The RTC-circuit remains active maintaining the time signal. The
energy is supplied with the batteries. This means that the time setting of
the instrument RTC is lost in case the batteries are removed for more than
1 minute.
Note: In case the instrument is to be stored for a prolonged period of time,
it is advisable to remove the batteries to prevent any electrolyte leakage to
the battery compartment.
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3 Main Parts of the RDS-31iTx
This paragraph presents the main parts of the instrument.
3.1 Display of the RDS-31iTx
The display of the RDS-31 is a 128 x 64
pixel graphical display with the Energy
Saving Backlight (ESB). The ESB-circuitry
measures the ambient light condition and in case the lighting is
sufficient, the backlight is not activated when the buttons are
operated.
The start-up display informs current date & time, FW version
and calibration state. In case the time of meter’s Real Time
Clock is not set, the flashing ‘TIME NOT SET’ message is seen on
the 1
st
row. The RTC can be set with the CSW-31 software.

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Display symbols and related functions:
SymbolFunctionSymbol Function
Buttonandalarmbuzzer
enabled
Buttonbuzzerdisabled,
alarmbuzzerenabled
Buttonbuzzerenabled,
alarmbuzzerdisabled
Buttonandalarmbuzzer
disabled.
Audiblechirpenabled.
Audiblechirpdisabled.
Note:IfSpeakerandChirp
symbolarenotvisibledevice
ismuted
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TheVibrationAlarm
Activated
AlarmConditionexists
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Waitingforexternal
detectordetection.Externaldetectoris connected
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BetadetectorAlphaDetector
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RF‐linkactive
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Blinking`life’indicatoron
upperlefthandcornerbehind
thebatteryindicator
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Unitsforcontamination:
cps,cpm,dpm,Bq,
Bq/cm
2
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Unitsfordose&doserate:
µSv,mSv,Sv,µSv/h,mSv/h,
Sv/h
µrem,mrem,R,µrem/h,
mrem/h,rem/h
µGy,mGy,Gy,µGy/h,
mGy/h,Gy/h
Batteryfull.
50%Capacity(changes
showedinstepsof10%)
PoweredfromUSBor
cradle.Showsbattery
capacityandUSB/cradle
symbolintwosecond
intervals.
AnalogBarGraph,indicationofveryshortintegrationtimepulserate.Helpsinsearching.
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AnalogBarGraphScale.Unitsofthebargrapharesameasthemainunits.
Maindisplayarea;usedformeasuredvalues,textmessagesandsymbols

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3.2 Connectors and Strap
The connector for an external detector and an external charger
is in the bottom of the instrument. There is also the fixing lug of
the wrist strap. The round connector (Binder 702 series) is used
for external probes, for cable connections and for external
alarming devices.
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Wrist strap fixing lug
Charging contacts
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    Connector and protective cap
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Note: Charging connectors are used when the instrument is placed into the
car cradle. In case the RDS-31 uses alkaline batteries, the instrument is not
charged with this connection but it will overdrive the batteries instead thus
eliminating the power consumption of the batteries. If the RDS-31 is off
when connected to the cradle the external power will wake the RDS-31.
Note: Using existing external detectors may require use of a cable adapter.
The adapter transforms the connector of the detector to the suitable
receptacle for RDS-31. In some case the cable adapter is required also to
make the detector electrically compatible with the instrument.
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3.3 Push Buttons
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There are two push buttons above the instrument display. It
ensures that the user always has the best possible grip on the
instrument even when operating the buttons.
On/Off
Menu
The buttons have bossed and cut features so that they are easy
to distinguish from one another. In addition, the pressure
threshold of the buttons is slightly higher than in typical buttons
RDS-31iTx Connector

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to prevent any unwanted activation of the button e.g. while
wearing gloves.
The two buttons have been named On/Off []and Menu [Ξ].
This indicates the main purpose of the buttons.
The On/Off button switches (through the menu selection) the
instrument on and off. The Menu button is used to operate the
menu lists of the instrument.
Other functions of these buttons are explained under appropriate
locations.
In this manual the button names or the representing symbol is
used when describing various operations.
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4Using the Buttons and Special Features
Using the buttons is a trivial task. Pressing the buttons requires
a bit more force than, for example, a regular keyboard button
since the surface of the button is above the surface of the
instrument front face. In the RDS-31, the press duration of the
buttons is crucial with regard to the desired action, so it is
necessary to pay attention to the matter.
4.1 Button Pressing Times
When operating the instrument, three different length pushes
can be used. There is a visual guide and an audible signal that is
given at the start of each time interval:
Short (p < 0.75 s)
Intermediate (0.75 < p < 1.5 s)
Long ( p > 1.5 s)
Note: The Analog Bar Graph can be disabled with the CSW-31 software.
A Short push of the button while
An intermediate push while
A long push while
is lit.
is lit.
is lit.
Note: While the different lengths of presses add versatility to the operation
of the instrument, it is possible to keep everything simple. Almost all the
features that would need this operation mode can be disabled leaving only
the bare minimum of operations.
The minimum approach is to disable all the menu functions: meter would
be constantly switched on and the On/Off button would switch the backlight

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on for 24 seconds and the Menu button would give the current accumulated
dose in the display for 14 seconds. In the background, the instrument
would perform the diagnostics and record the current status, dose and dose
rate into the histogram memory with each pushing of the button (Manual
histog. Shortcut). Otherwise, the histogram would record the dose and
dose rate on every preprogrammed time interval.
In this mode the instrument could also operate in the Sequential Alarm
mode, which means that when the current Alarm threshold is exceeded and
the alarm triggers on, the pressing of the button would activate the next
Alarm Threshold in the sequence and the instrument would be silenced.
This mode would be most suitable for Fire Fighters and other workers who
need to concentrate on the task at hand rather than the operation of the
meter. When the daily activities are over, the instrument would be
connected to the CSW-31 software where the histogram would be recorded.
4.2 Normal Usage of the Buttons
Normally the Menu button is pressed to activate the user
interface menu and to scroll through the various functions. When
the desired function is in the display, the On/Off button is
pressed to activate the next level of display. Typically this level
shows the currently active configuration of the instrument.
Generally the buttons function in the menu as follows:
Short press of the Menu button scrolls down in the
menu.
Intermediate press of the Menu button scrolls up.
Long press of the Menu button goes back in the menu.
Short press of the On/Off button goes forward in the
menu.
Intermediate press of the On/Off button selects the
active blinking value.
Long press of the On/Off has no function.
4.3 Special Feature: Shortcut-Function
Both buttons can be programmed with two additional operations
when the display of the instrument shows the normal dose rate
values. These operations can be set with the CSW-31 software.
An intermediate or long pressing of the button is used to
activate the Shortcut-function.
For example, the On/Off-button can be programmed so that the
long pressing switches the instrument off. The default is through
the Menu operation. Alternatively, the Menu-button can be
programmed to perform the Manual Histogram Storage with an
intermediate pressing of the button and Change Histogram State
with a long pressing. With this programming it is easy to pick up
the new measurements from several different rooms/spaces
when performing the Plant surveillance.

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5 Operation
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Switch On
Press the []button until all the display pixels are turned on and an
audible signal is heard. The meter performs a self-test function:
All the display pixels are turned on
The buzzer is activated
The display backlight is switched on
The battery condition is tested
The HV-generator is tested
The presence of the RF link is checked and the connection is
established.
In case the internal Real Time Clock (RTC) is not set to the proper
time flashing ‘TIME NOT SET’ message is displayed. The RTC can be
set with the CSW-31 software.
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Switch Off (OFF)
To switch the instrument off:
Activate the menu (Short [Ξ]).
The display changes to blinking OFF.
Press an intermediate []
The display goes blank. The instrument is now switched off.
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The instrument has two push buttons. In order to change the
operational parameters of the instrument, the menu must be
activated (see the menu flow chart p.11). A short beep is
audible when the push button is pressed. See also the page 7
paragraph Using the Buttons and Special Features.
In order to activate the menu:
Press the [Ξ]button shortly, the display changes to the first
menu item, e.g. “OFF”. Release the button. Now the menu is
activated for 14 seconds and the menu items can be scrolled by
pressing the [Ξ]button shortly.
In order to activate the menu item:
When the desired menu item is displayed, press the []button
shortly and the desired menu item is activated.
If the push button is not pressed for 14 seconds after activating
a menu item, the menu and the menu item will be deactivated
automatically and the display returns to the dose rate display.
Note: In some situations the function of the buttons are changed
from the default. The changed functionalities are described later
in the manual.

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The instrument starts measuring the dose rate and accumulating
the dose immediately when the instrument is switched on.
During the initial start-up, the instrument informs the user that
the time of the Real Time Clock has not been set (flashing ‘TIME
NOT SET’ message). The RTC can be set with the Configuration
Software CSW-31.
The parameters of the instrument can be changed using the
menu functions described later in this manual. The Configuration
Software for RDS-31iTx (CSW-31) is required to change those
parameters that are either disabled from the Instrument Menu
or are included only in the CSW-31. Almost all of the menu
functions can be disabled with the software. When the menu of
the instrument has been activated and the push button is not
pressed for 14 seconds, the display returns to the dose rate
display.
5.1 Indication of the Measuring Unit
The basic instrument RDS-31iTx has two units available for the
measurements when using the internal GM-detector: Sv-based
and rem-based units. A suitable sub-multiplier ‘µ’ or ‘m’ is set to
extend the display range. In addition ‘/h’ is applied to indicate
the dose rate. With external probes, additional units can be
provided in the display, depending on the external detector.
With external gamma detectors, the same
basic units can be used (Sv/h, Sv, rem/h
and rem). With external pulse mode
detectors (GMP-11-3/15-3/25), the display
can be configured to units (cps, cpm, dpm,
Bq or Bq/cm
2
).
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The selected unit is indicated above the reading.
The prevailing dose rate will be displayed within 10 seconds.
5.2 Display Illumination
To switch the illumination on, press the []button shortly.
The display backlight is lit for 24 seconds
Note: The Backlight state will depend on the configuration and
the ambient light condition.
Note: Pressing the [Ξ]button will activate the backlight, but it
will also activate the Menu

11

5.3 Operating the Instrument Menu
The actual Menu list is completely dependent on the existing
instrument configuration. This means that in the most basic form
there are no items in the menu list that can be activated with
the button operations. Pressing the button will only illuminate
the display and perform some internal functions.
The following table summarizes the first level of all the possible
menu functions. The user has the total freedom to optimize the
instrument to the specific work by removing those menu
components that are not necessary to the work so that the
necessary functions can be reached easier.
5.4 Menu Items
Menu Item Function
OFF Switching the instrument Off (Immediate action with an
intermediate pressing of []button)
DOSE Check and reset the current accumulated dose value
MaxDR Check and reset the current maximum recorded dose rate
since last reset
CHIRP Adjust the sensitivity of the visual and audible pulse
indication
FX.RAL Check and change the activated threshold level of fixed
dose rate alarm system
XT.CLR /
XT.RAL
Shown only if the external detector is connected. Check
and change the activated threshold level of the external
detector alarm rate.
1)SQ.RAL Check and change the state of sequential dose rate alarm
system
FX.DAL Check and change the activated threshold level of fixed
dose alarm system
1)SQ.DAL Check and change the state of sequential dose alarm
system
TM.2.AL Display the remaining work time until the next dose
alarm is activated in the current dose rate field
DIAG Activate the internal diagnostics, check software revision
and battery capacity.
CONN Activate the communication with CSW-31 using the RF-
link .
HISTO Operate the Histogram functions and/or pick manually the
current data values into the memory.
EXTRN.DETECT. Shown only if the external detector is connected. Check
and change the configuration of the external detector.
WRM Check and change the WRM state.

12

1) Optional menu items depending on the configuration
5.4.1 Show and Reset Cumulative Dose (DOSE)

The instrument integrates the cumulative dose
continuously into a dose register when
switched on.
To see the cumulative dose:
Activate the menu (Short [Ξ]) and scroll (Short [Ξ]’s) until
display changes to DOSE.
The display shows the cumulative dose.
Note: The same basic unit is used both for the dose and for the
dose rate.
To reset the cumulative dose:
While the cumulative dose is displayed, press []shortly
and the display shows the text ‘RESET?’ blinking
Press an intermediate [] (Short [Ξ]takes back to the
menu)
The cumulative dose is now set to zero.
The display shows the 0 µSv (0 µrem) without any blinking and
if no button actions take place within the time-out period, the
display returns to the dose rate.
5.4.2 Maximum Measured Dose Rate (MaxDR)
The instrument monitors the maximum dose
rate while measuring. It is possible to check
the maximum dose rate value from the last
reset of this field. The value is stored into the
permanent memory so that removing the battery will not clear
the field and its value.
To see the maximum dose rate:
Activate the menu (Short [Ξ]) and scroll (Short [Ξ]’s) until
display changes to MaxDR.
The display shows the currently recorded Maximum dose
rate in the configured unit.

To reset the maximum dose rate:
While the current maximum dose rate is displayed, press
[]shortly and the display shows the blinking ‘RESET?’ text

13

Press an intermediate [](Short [Ξ]takes back to the
menu).
The maximum dose rate is now set to zero.
The display shows the 0.0 µSv/h (0 µrem/h) without blinking
and if no button actions take place within the time-out period,
the display returns to the dose rate.

5.4.3 Chirp Off and Setting Divisor
(CHIRP)
The chirp function can be used to activate or
deactivate the audible or visual chirp and to
select the Chirp divisor. The possible divisors are: 1/1, 1/2, 1/5,
1/10, 1/20 and 1/50. The division affects both the audible and
the visual chirp function.
Note: The audible and visual Chirp can be disabled individually, but
they share the common dividing ratio when enabled.
To see the chirp state:
Activate the menu (Short [Ξ]) and scroll (Short [Ξ]’s) until
display changes to CHIRP.
The display shows A:ON| A:OFF depending on the current
state of the Audible Chirp.
V:ON| V:OFF depending on the current state of the Visual
Chirp.
And, H:/1|…H:/50| depending on the current state of the
common dividing ratio.
CHIRPSUB‐menu1&2
...
↓
CHIRP
H:/1
Divisor
Submenu
↓ ↑
A:OFF→ Audio Submenu→ChooseOption
↓ ↑
V:ON
Visual
Submenu
↓
...

14

To change the chirp state:
While the current chirp state is displayed, press []shortly
and the display shows the state of the related Chirp
function blinking
Scroll with short [Ξ] until the desired value (CA:OFF|
CA:ON; CV:OFF| CV:ON; CH:/1|…CH:/50) is given
Press an intermediate [](Short []takes back to the
menu).
The Chirp state is now set.
DivisorSubmenu
...
↓ ↑
CH:
/50
↓ ↑
/1
↓ ↑
/2→
ChooseOption
↓ ↑
/5
↓ ↑
/10
↓ ↑
/20
↓ ↑
The display provides the new setting without blinking and if no
button action takes place within the time-out period, the display
returns to the dose rate.

5.4.4 Show and Change Dose Rate Alarm Level
(FX.RAL/SQ.RAL)
The dose rate alarm of RDS-31 can operate in two different
modes:
Fixed dose rate alarm level
Sequential dose rate alarm
NOTE: The mode can be selected only by using the CSW-31
software.
AudioSubmenuVisualSubmenu
CA:
...
CV:
...
↓ ↑ ↓ ↑
ON→
ChooseOptionOFF→ ChooseOption
↓ ↑ ↓ ↑
OFFON
↓ ↓
... ...

15

5.4.4.1 Fixed Dose Rate Alarm Level:
There are 8 different levels for dose rate
alarm:
disabled, 10, 50, 100, 500, 1 000, 5
000, 10 000 or 50 000 µSv/h or mrem/h.
The user may select any one of these to be the active alarm
threshold level.
Note: All these dose rate alarm threshold levels can be changed and stored
into the instrument’s internal memory with the CSW-31 software.
To see the current dose rate alarm threshold level:
Activate the menu (Short [Ξ]) and scroll (Short [Ξ]’s) until
display changes to FX.RAL
The current dose rate alarm threshold value is displayed on
right side of the display.
To change the current dose rate alarm level:
While the current dose rate alarm level is displayed, press
[]shortly; the next level in row starts blinking
Scroll with [Ξ]’s shortly until the desired value is given
Press an intermediate []
The new alarm limit is activated
FX.RALSUB‐menu
...
↓  ↑ 
FX.RAL
OFF
↓  ↑ 
10.00µSv/h
↓  ↑ 
50.00µSv/h→
Choose
Option
↓  ↑ 
100.0µSv/h
↓  ↑ 
500.0µSv/h
↓  ↑ 
1.000mSv/h
5.000mSv/h
10.00mSv/h
50.00mSv/h
Allnumericalvaluesofthelistcanbechanged
usingtheCSW‐31software.
↓  ↑ 
... 

16

5.4.4.2 Sequential Dose Rate Alarm:
When the sequential dose rate alarm
function is enabled, all the eight dose rate
alarm levels will be active in the order of the
list (the default values are the same as in the “fixed dose rate
alarm level”). When the first value on the list is exceeded, the
alarm signal is activated. It can be muted by pressing either one
of the push buttons and the value of the second lowest in the list
becomes active. The list will be taken into use in succession until
the last position is set as a reference. To set less than 8 effective
limits, the largest threshold values can be set to include the
same value.
Note: In case the Sequential dose rate alarm is activated and triggered, the
short pressing of either button has no other effect than to acknowledge the
alarm and to mute the audible signal. The display still shows the symbol’
AL’ while the condition continues.
Note: When the dose rate becomes lower than the limit on the list, which
has been acknowledged already, exceeding this limit will re-trigger the limit
again.
To enable/disable the Sequential dose rate alarm:
Activate the menu (Short [Ξ]) and scroll (Short [Ξ]’s) until
display changes to SQ.RAL
Press []shortly
The current state of the dose rate alarm system is
displayed (“lowest dose rate alarm level” = enabled|
SQ.RAL
OFF =disabled)
To change the state of the Sequential dose rate alarm system:
While the current state of the dose rate alarm system is
displayed, press []shortly; the next level in row starts
blinking
Select the desired state with short [Ξ]press (only the
lowest level can be chosen or SQ.RAL
OFF ).
Press an intermediate []
The lowest level/OFF-state is activated