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Manual
RTM 1688-2
Radon- and Thoron-Measurement equipment
Version 02/2023
Referenced documents:
Software manual Radon Vision
Software manual ROOMS 1.2.0
SARAD GmbH
Wiesbadener Straße 10
D-01159 Dresden
GERMANY
Internet:
www.sarad.de
E-mail: sales@sarad.de
Tel.: ++49 (0)351 / 6580712
FAX: ++49(0)351/6580718
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Summary of Contents for SARAD RTM 1688-2
- Page 1 Manual RTM 1688-2 Radon- and Thoron-Measurement equipment Version 02/2023 Referenced documents: Software manual Radon Vision Software manual ROOMS 1.2.0 SARAD GmbH Wiesbadener Straße 10 D-01159 Dresden GERMANY Internet: www.sarad.de E-mail: sales@sarad.de Tel.: ++49 (0)351 / 6580712 FAX: ++49(0)351/6580718...
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Page 2: Table Of Contents
Implemented MODBUS functions ..................... 13 Statistical Error (for non-mathematicians) .................... 14 Error Prediction ..........................14 Detection Limit ..........................16 Service ..............................17 Disposal instructions ..........................18 Technical Data ............................19 Scope of delivery: ..........................20 Optional accessories: ..........................20 SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 3: Applications
Short Description The RTM 1688-2 is an absolutely universal radon / thoron monitor with which the entire range of radon measurements can be covered. Its high sensitivity, combined with the measurement method of alpha spectroscopy, allow the fastest possible measurements even with low radon concentrations. -
Page 4: Important Hint
Now, the decay chain is continued by the both beta emitters Pb-214 and Bi-214 followed by another alpha emitter, the Po-214. That means, each Po-218 decay causes one more detectable decay by the Po-214 which is delayed about 3 hours because of the superposed SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... - Page 5 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. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx...
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Page 6: Operating Of The Instrument
The pressing of the “TOGGLE” button leads back to the standard display output. If the battery voltage decreases down to 11.2V the running sample will be stopped and the instrument enters in the stand by status. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 7: Input Filter
The penetration of water into the device can lead to its failure and, as a result, to very expensive repairs! SARAD GmbH offers to its customers a special stainless-steel container with floating contact to prevent the penetration of water into the device when measuring radon in soil gases and in water samples. -
Page 8: Carrying Out A Measurement
The next page shows the average values of the Radon and Thoron concentration from the start of the actual measurement series. The total sampling time is given in the first row. Average 68.0Hrs 314Bq/m³ 141Bq/m³ SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 9: Adjustment Of The Sampling Interval
(if any) and immediately decomposes in the measuring chamber. In order to receive information as quickly as possible, the acoustic signal generator can be set to "sniffing" mode. Each registered decay is indicated by a short signal. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 10: Data Handling
Each data record is stored after completion of the integration interval and contains the full information of this single integration interval: • time stamp • integration time • alpha spectrum • readings of additional sensors SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 11: Printing A Protocol
Single point measurements are also possible. Printing a protocol The RTM 1688-2 enables the direct printout of acquired data on the portable protocol printer. Only the last acquired measurement series can be printed. Connect the printer to the RTM 1688-2 by the adapter cable (9-pin SUB-D male to 3-pin round connector) included in the delivery. -
Page 12: Data Transfer
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. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 13: Version Rtm1688-2 Modbus
RTM 1688-2 Version RTM1688-2 MODBUS The MODBUS protocol offers a communication option in addition to the SARAD standard protocol. The protocol type can – depending on the type of instrument – be selected either by jumper, switch or menu. The MODBUS protocol implements only a part of the interface functionality and has been implemented primarily for the cyclic reading of current measuring results. -
Page 14: Statistical Error (For Non-Mathematicians)
Error Prediction The relative statistical error E for a chosen confidence interval of k-Sigma can be predicted from the number of detected counts N by the equation: E[%] = 100% * k * (N) / N SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... - Page 15 * (N) / N = 100 % * 1 * (192) / 192 = 7.22 % Now one could say 68.3% is not sure enough, I want to choose 2 confidence interval to get a more trustable result: SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx...
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Page 16: Detection Limit
1. Because of the statistical variations, intervals without any detected decay will appear frequently. The most extreme situation would be a measurement series with a lot of “zero” intervals and only one interval with one detected decay (because a decay cannot be split). SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 17: Service
You will then receive an initial cost estimate from us as well as information on how to proceed. The device check and the preparation of the cost estimate for repairs after the warranty has expired are subject to a fee. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 18: 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. SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 19: Technical Data
232 mm x 182 mm x 135 mm Environmental condition Temperature 5 °C ... 40 °C rel. humidity 0 … 95%, not condensing bar. pressure 800...1100 hPa Weight , net 3.5 kg Tamper detection if instrument is moved > 8 Seconds SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx... -
Page 20: Scope Of Delivery
No. Article no. Name Quantity Remark Measurement case * 20050025 incl. 1x tube 2m (6x3mm) 2x adapter 5/10mm 1x tube 1m (10x6mm) Transportation case for RTM 1688-2 with 20050021 IP68 (Peli™)* 10010003 Aqua Kit 500ml 1set to measure Rn in water incl. - Page 21 Thermal printer 13 90050027 Water ingress protection 1 Set 14 80020002 Dust filter 1 Set 10 pcs 15 78800001 4G VPN-Router incl. adapter 16 50011012 5l barrel to measure radon emanation from bulk materials * selectable SARAD GmbH 2023 Manual_RTM1688-2_EN_24-02-2023.docx...
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