Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for SARAD RTM1688-2
Summary of Contents for SARAD RTM1688-2
- Page 1 SARAD GmbH User Manual RTM1688-2 Version 02/2019 SARAD GmbH Wiesbadener Straße 10 D-01159 Dresden GERMANY Internet: www.sarad.de E-mail: support@sarad.de Tel.: ++49 (0)351 / 6580712 FAX: ++49(0)351/6580718 User Manual RTM1688-2 06-02-2019.docx...
-
Page 2: Table Of Contents
Data Handling ............................7 Data Storage ............................ 7 Printing a protocol ........................... 8 Data transfer............................ 9 Version RTM1688-2 MODBUS ....................... 10 General information .......................... 10 Selection of the transfer protocol, Addressing ................. 10 Implemented MODBUS functions ..................... 10 RTM1688-2 GEO Version ........................12 Power Supply ............................. -
Page 3: Important Hint
The RTM1688-2 offers two calculation modes for the Radon concentration, one (Slow) includes both, Po-218 and Po-214 decays and the other one includes Po-218 only (Fast). The advantage of the “Fast”... - Page 4 The half-life of the Po-216 decay products Pb-212 (beta) and Pb-212/Bi-212 (alpha) are too long to use them for Thoron measurement. The single nuclides of the Thoron decay chain will be also separated by alpha spectroscopy. User Manual RTM1688-2 06-02-2019.docx...
-
Page 5: Operating The Instrument
Press the push button to start a new measurement series. The pump starts and the display will show the remaining time to complete the first integration interval. RTM1688 SN:00001 Wait 120 Minutes for first data! The actual status and set-up information (see below) may be displayed by pressing the button again. User Manual RTM1688-2 06-02-2019.docx... - Page 6 To finish a measurement series keep the push button down and wait for at least four beeps from the buzzer. If the button is released, the sample will be stopped. If the button has been locked by software, the button has to be unlocked before. User Manual RTM1688-2 06-02-2019.docx...
-
Page 7: Adjustment Of The Sampling Interval
This will save time during the next transmission and avoids redundant data storage. Each data record is stored after completion of the integration interval and contains the full information of this single integration interval: User Manual RTM1688-2 06-02-2019.docx... -
Page 8: Printing A Protocol
Single point measurements are also possible. Printing a protocol The RTM1688-2 enables the direct printout of acquired data on the portable protocol printer AP 1300. Only the last acquired measurement series can be printed. Connect the printer to the RTM by the adapter cable (9-pin SUB-D male to 3-pin round connector) included in the delivery. -
Page 9: Data Transfer
Connect the PC interface cable (9-pin SUB-D female to 3-pin round male) to both, instrument and PC COM port. If the PC is not equipped with a standard COM port a USB to serial converter can be used. For further information read the software manual. User Manual RTM1688-2 06-02-2019.docx... -
Page 10: Version Rtm1688-2 Modbus
RS485 data lines such as EXPERT EX9520R. The MODBUS interface supports only the transmission of the recent readings. For all other functions the SARAD standard protocol has to be used. The protocol frames are explained in detail by the document “SARAD_MODBUS_Protocol”. The complete MODBUS Documentation can be found in the internet under “modbus.org”. - Page 11 IEEE 745 float values (4 Byte) are transmitted as two sequential 16 bit registers. The number of registers to be read must be two. That means, only one value can be transmitted per frame. Other values and not stated register addresses will cause an exception response. User Manual RTM1688-2 06-02-2019.docx...
-
Page 12: Rtm1688-2 Geo Version
SARAD GmbH RTM1688-2 GEO Version The RTM188-2 GEO is a special version of the RTM1688-2. The control panel of the unit, the battery and an optional modem have been integrated into a sealed enclosure (IP68 protected). The Radon measurement chamber, sensors for temperature and humidity as well as the tilt detector are placed into a separate soil gas probe. -
Page 13: Connection Of The Soil Gas Probe
Therefore, each serious measurement contains beside the calculated Radon value the error band for a stated confidence interval. The commonly used confidence intervals are 1, 2 or 3 Sigma () which refer to a likelihood of 68.3%, 95.45% and 99.73%. User Manual RTM1688-2 06-02-2019.docx... -
Page 14: Error Prediction
T(fast) = N / (C * S) = 100 cts / (0.2 kBq/m³ * 4 cts/(min*kBq/m³) = 125 min. Because the required interval is longer than 2 hours, the slow mode is the better choice, leading to the following result: User Manual RTM1688-2 06-02-2019.docx... - Page 15 The error bands of the readings do not overlap each other. Therefore, a statistical significant concentration change is given. Two arbitrary points of a measurement series may be considered using this test. It is not necessary that the points are direct neighbours. User Manual RTM1688-2 06-02-2019.docx...
-
Page 16: Detection Limit
Required mean value (number of counts from the table): N = 3. Calculating the detection limit by the formula: C = N / (T * S) = 3 cts / (60 min * 8 cts/(min*kBq/m³)) = 0.00625 kBq/m³ = 6.25 Bq/m³ The detection limit in this case is 6.25 Bq/m³. User Manual RTM1688-2 06-02-2019.docx... -
Page 17: Disposal Instructions
The measuring instruments must be disposed of in the electronic waste or handed to the manufacturer at the end of their service life for proper disposal. If necessary, they have to be decontaminated before. User Manual RTM1688-2 06-02-2019.docx... -
Page 18: Technical Data
MODBUS RTU (9600/19200bps) ASCII Protocol print Dimensions 232 mm x 182 mm x 135 mm Weight 3.5 kg Tamper detection if instrument is moved > 8 Seconds User interface Display 3 x 16, 2 push buttons, buzzer User Manual RTM1688-2 06-02-2019.docx...