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ALARM TONES  

   

The  meter  provides  six  different  alarm tones. Only one  of  these  can  be  emitted  at  a 
time.  These  alarm  tones  and  their  meanings  are  described  below  in  order  of 
importance:   
   
Meaning of tone    

 

 

 

 

Timing   

   

 

 

Duration  

   
1. Battery voltage too low. 

 

 

 

 - - - - - - - - - - - - - - - -   

5 seconds  

2. 

Radiation level exceeds measurement range

.    

––

 

––

 

––

 

––

  

… 

   

 

continuous  

3. Dose rate alarm level.  

 

 

 

 - -         - -          - - 

…  

 

continuous  

4. Cumulative dose alarm level.  

 

 

––

               

––

   ...      

continuous  

5. Button pressed.   

 

 

 

 

 -   

 

 

 

 

single beep  

6. Radiation pulse detected.    

 

 

-   

 

 

 

 

single beep  

   
The symbols used in the timing chart above have the following meanings:   

tone  

=   

pause  

... 

=   

sequence repeats  

  

SPECIAL DISPLAY MESSAGES  

   

   :

  

Low  battery  voltage  warning.  Appears  in  the  display  when  the  battery  voltage     
drops below a certain level. This indicates that the meter will operate for only fifty 
more hours at the most, and that the battery should be replaced with a new one as 
soon  as  possible.  If  the  battery  voltage  continues  to  drop  the  meter  will  emit  an 
alarm tone for 5 seconds then switch itself off. This is done to ensure that data is 
retained  in  memory,  and  in  the  case  of  NiCd  batteries,  to  prevent  complete 
discharge of the battery.  

   

OFL

 

Out-of-range warning. This message will appear in the display when the dose rate 

exceeds the meter’s measurement range. An alarm tone is also emitted. 

 

   

xxE3

  When the dose rate exceeds 9999 µSv/h it will be displayed in exponential mode  in 

integer  units  of  one  thousand.  For  example,  a  dose  rate  of  55000  µSv/h  will  be 
displayed in the form 55E3.  

   

Auto 

See section on measurement mode selection. 

   

Fast 

  

See section on fast measurement.  

   

h/H

   

See section on precision measurement.  

 
The meter executes a self-diagnostic routine to detect possible fault situations. If a fault is 

detected the meter displays an error message consisting of the letters ‘Er’ followed by a 

number. All error messages except Er1, which remains in effect until the fault has been 
corrected, can be cancelled by pressing any function button.  
The error messages are described below:  
   

Summary of Contents for DGM-1500 Turva

Page 1: ...Manual DGM 1500 Turva Personal Survey Meter Made in Finland...

Page 2: ...n invaluable tool The design of the DGM 1500 complies with official recommendations and requirements and reflects the expertise and experience gained by the manufacturer over a long period of time in...

Page 3: ...Fast measurement 4 3 2 3 Precision measurement 4 3 2 4 Programming the alarm limits 4 4 ALARM TONES 5 5 SPECIAL DISPLAY MESSAGES 5 6 USING THE DGM 1500 TURVA 6 6 1 General 6 6 2 Environmental measure...

Page 4: ...1500 TURVA PERSONAL SURVEY METER 2 OPTIONAL ACCESSORIES Mains adapter 9V Reg 3 mm DIN connector Wall mounting bracket and fixing screws Carrying case Display Dose Sound Power on Power off Display bac...

Page 5: ...r always contains the cumulative radiation dose whenever the meter is in operation This register can be cleared by the user at any time if required The measurement range of the dose register is 0 001...

Page 6: ...range of measurement is 0 01 9 99 microSv h If the dose rate momentarily exceeds this range the meter will immediately switch to the automatic mode Precision measurement is operational at low dose ra...

Page 7: ...e continues to drop the meter will emit an alarm tone for 5 seconds then switch itself off This is done to ensure that data is retained in memory and in the case of NiCd batteries to prevent complete...

Page 8: ...00 functions on two levels On the basic level it is an easy to use radiation meter which automatically measures both dose rate and cumulative dose All the user need do is switch the meter on In additi...

Page 9: ...urement of ambient radiation The DGM 1500 has a connector for a mains adapter allowing it to be used for round the clock radiation monitoring A wall mounting bracket for the meter is available as an o...

Page 10: ...tion level the effectiveness of the decontaminating process can be assessed and if necessary the cleansing process repeated with fresh purified water It should be noted that the authorities may impose...

Page 11: ...1 kilogram of the foodstuff sample to be measured This could be milk water meat or fish for example Put the bag inside another bag to make sure there is no leakage Squeeze the air out of the top and c...

Page 12: ...Press the O button until CS is shown on the display Then immediately place the foodstuff bag so that it is draped over the meter 3 Wait for at least one hour for the result The first intermediate res...

Page 13: ...g the old units will first have to convert the new units into the old in order to gain an idea of the radiation level The conversion table given below Table 2 facilitates this The R ntgen h is the irr...

Page 14: ...racy and reliability of ambient radiation measurements made with the DGM 1500 The meter was tested in a lead lined chamber where it was possible to achieve an ambient level of 0 02 microSv h and the v...

Page 15: ...ccuracy at low dose rates Unequalled accuracy at ambient radiation levels The meter reading is still valid at levels as low as 0 02 Sv h Finnish Centre for Radiation and Nuclear Safety STUK calibratio...

Page 16: ...TIFICATE DGM 1500 Turva Radiation survey meter Serial number Calibration point 1000 Sv h at 20 C Cs 137 source Reading at the calibration point 5 Linearity 10 at 20 C Warning and alarm levels in Finla...

Page 17: ...15 NOTES...

Page 18: ...16 NOTES...

Page 19: ...17 NOTES...

Page 20: ...Kata Electronics Oy Tehtaantie 8 80400 Yl mylly FINLAND Tel 358 13 631 971 Fax 358 13 631 474 E mail kata kata fi Web www kata eu...

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