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BGB Projects LPR Technical Information

Corrosion rate meter
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Dr J P Broomfield
Mr K G Davies
57 Brook Rd
Flixton, Manchester
M41 5RY, UK
Tel: +44 (0) 161 748 3645
Fax: + 44 (0) 161 748 3645
Email: corrosioneer@btconnect.com
BGB Projects
LPR Corrosion Rate Meter
Technical Information
Registered Office: 18 Craig Avenue, Flixton, Manchester, M41 5PT – Tel: +44 (0) 161 748 3645 – Fax: +44 (0) 161 748 3645
Company Registration No: 333 7082 – VAT No: 693 2194 16

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Summary of Contents for BGB Projects LPR

  • Page 1 Fax: + 44 (0) 161 748 3645 Email: corrosioneer@btconnect.com BGB Projects LPR Corrosion Rate Meter Technical Information Registered Office: 18 Craig Avenue, Flixton, Manchester, M41 5PT – Tel: +44 (0) 161 748 3645 – Fax: +44 (0) 161 748 3645...
  • Page 2 The LPR Corrosion Rate Meter measures rates of corrosion of metals in corrosive environments. There are many similar devices available, these are usually intended to be used with corrosion probes of a relatively small surface area. The LPR Corrosion Rate Meter is specifically designed for measurement of corrosion of steel reinforcement in concrete where the surface area of the test electrode (rebar) can be large.
  • Page 3 Ensure that the SE (BLUE) and WE (GREEN) terminals are shorted • Power on the LPR Meter by turning the key switch o As the meter powers up check that the battery voltage is at least 10.5V - recharge the meter otherwise.

  • Page 4: Controls And Connectors

    3.1. Controls The LPR Corrosion Rate Meter is operated by two push buttons, green and red. A menu system is used - the user selects an appropriate action by pressing one of the push buttons. For most simple measurements only several presses of the green button are required.
  • Page 5 ID read may be <ID LPR> repeated if necessary. Selecting LPR by pressing the right (GREEN) button Ecorr: -234.5 mV initialises a measurement of the corrosion potential. Go >> The measured value of the potential between the test electrode and the reference electrode is displayed.
  • Page 6 INSTRUCTION MANUAL – LPR METER The meter then shows the measured corrosion rate in Ecorr: -234.5 mV μm/year and a count timer showing the number of Rate: 70.1 seconds into the measurement. The corrosion rate reading is updated approximately once per second.

  • Page 7: Operating Principle

    INSTRUCTION MANUAL – LPR METER OPERATING PRINCIPLE 5.1. Summary The LPR Corrosion Rate Meter uses the LPR measurement method to determine the corrosion rate of the connected test electrode. The measurement is carried out potentiostatically, using 3 electrodes and a 20 mV anodic polarisation.
  • Page 8 × 9 645 10 7 87 The LPR Meter calculation assumes a Stern-Geary constant B of 60 mV, a test electrode surface area of 100 cm and shows the corrosion rate in μm/year. To convert to other values it will be necessary to adjust the corrosion rate measurement result accordingly.
  • Page 9 RS-232 COMMUNICATIONS 6.1. Summary The meter communicates via a RS-232 interface. An adaptor for connection of the LPR Meter to a standard 9 pin RS-232 serial lead (male to female) is supplied. All communications are at 9600 baud 8N1. Communications may be carried out using a terminal emulator program (e.g. Windows HyperTerminal), other suitable software or the supplied application (LPR232.EXE)
  • Page 10 512 comma delimited lines. The reading number currently being sent is shown on the display. The data output format is : Meter number as set by switches on the LPR circuit board 123, Reading number from 1 to 512...

  • Page 11: Care And Maintenance

    The LPR Meter battery voltage is displayed after power-up of the meter. On a fully charged battery the LPR Meter will take in excess of 250 readings before it needs to be recharged.
  • Page 12 INSTRUCTION MANUAL – LPR METER 7. Reconnect the new battery leads to the terminal block. 8. Replace the new battery in the LPR Meter case. Do not overtighten the battery bracket pillars. 9. Re-assemble the case lid, ensuring that no wires are trapped between the lid and the case body.

  • Page 13: Troubleshooting And Faq

    LPR Meter is turned off with the key switch. If the main battery does not hold charge satisfactorily, replace it. 8.2. LPR Meter powers up but appears to lock up during the power up sequence Replace the real time clock battery. 8.3.
  • Page 14 Connect the LPR Meter to a PC using the supplied adaptor. Run the supplied application (LPR232.EXE). Select the appropriate serial port (COM1 to COM4). Power up the LPR Meter. The circuitry will automatically detect that a PC is connected and will display ‘RS-232 Ready’ message. Check operation by clicking the ‘Test’ button. The LPR display will show ‘20’...
  • Page 15 INSTRUCTION MANUAL – LPR METER LPR Meter Specification : Measurement Technique: Three electrode potentiostatic linear polarisation resistance measurement using anodic polarisation of 20 mV applied for 60 seconds. Corrosion Potential Measurement Range: +/-1024 mV w.r.t. Reference Electrode Corrosion Potential Measurement Resolution: 0.1 mV...
  • Page 16 INSTRUCTION MANUAL – LPR METER LPR Meter Menu Flow Diagram. Corrosion Control Services Meter # 101 Battery: 12.5V Meter # 101 15/10/2004 23:59 Reading # 001 <ID LPR> ID: 53FE-1234 LPR> Ecorr: -234.5 mV Stored 101-001 Go >> 2003/12/31 23:59...
  • Page 17 These are the headers (not shown on downloads)……………… Meter Record Date Time Chip ID No Ecorr Epol Corrosion Rate Battery Timer Multiplier RATE (mV wrt Ag/AgCl/KCl) (µm/yr/100cm²) Voltage (V) error error These are the type of records downloaded. Note all 512 records are downloaded each time 07/08/2008 11:43:50 0000-0000-0000 -417.8 -398.0...