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Date: August 2021 This confidential document was prepared by the staff of Valeport Limited, the Company, and is the property of the Company, which also owns the copyright therein. All rights conferred by the law of the copyright and by virtue of international copyright conventions are reserved to the Company.
They are designed to accurately measure water velocity in open channels with flows varying from 0.03 m/s to 10 m/s (BFM001), or 0.05m/s to 5m/s (BFM002). The calibration of the meters is based upon Group Calibrations carried out by HR Wallingford to standards established by the British Standards Institution.
Non‑Valeport Control Units It is advised that if the revolution counter being used is not of Valeport origin, no more than 5 milliamps are passed through the reed switch, to avoid damage. Valeport cannot accept responsibility for damage incurred when using non‑Valeport Control Units...
MANUAL-1550859975-1 | issue: 1.1 Maintenance Instructions The BFM001 and 002 flowmeters have been designed to require minimum maintenance under normal operating conditions. The Control Unit and wading/suspension cables should require no maintenance other than routine inspection and cleaning. It is recommended that the flowmeter itself is thoroughly washed and cleaned in fresh water after each deployment.
The 0012B contains calibration details for the Valeport meters BFM001, 002, 004, 007 and 050, and allows calibration coefficients for 4 other meters to be programmed in. User specific names for other meter calibrations can also be entered for ease of user identification.
The type of meter currently selected is displayed here. Toggle between the available meters by pressing the key. Pre-programmed meters available are the BFM001, 002, 004 (19mm), 004 (28mm), 007 & 050. For details of how to program the calibration details of another meter, refer to Section: Options Menu.
The Model 0012B will not be able to display speed data if the pulse output from the impeller exceeds 50Hz. The operating ranges of all Valeport impellers fall well within this, but if inputting calibration data for a different meter, check that the expected pulse frequency is below 50Hz. If a larger frequency is anticipated, contact Valeport Limited.
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For line fits less than four line fits the unused parameters should be filled in with zeros. For example, the calibration for the BFM001 is a two straight line fit, with equations: V = 0.013 + 0.2512n (up to 0.32 revs/sec) V = 0.008 + 0.2667n (from 0.32 up to 11.28 revs/sec)
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#003 2 0 0 0.001 0.003 0.6 7.03 0.6 4.1 To change the name of the meter, type the correct #CODE followed by the new name (upper and lower cases are recognised). For example, to change the name from OTHER3 to BFM001, enter: #013 BFM001 When all required data has been input, enter #000, and the 0012B will automatically return to the Options Menu.
Section 6 | Flowmeter Spares Flowmeter Spares Valeport maintains full spares, service and repair facilities for all its instruments. In the event of spares or additional items being required, the main sub-assemblies and spare parts are detailed below. BFM0011 Current meter fitted with 127 mm dia. x 0.27m pitch impeller BFM0021 Current meter fitted with 50 mm dia.
Any changes or modifications to the product or accessories supplied, that are not authorised by Valeport Ltd, could void the CE compliance of the product and negate your authority to operate it. This product has demonstrated CE compliance under conditions that include the use of shielded cables.
Standards Institution, BS3680, Part 8A, 1973. Application It applies to the BFM001 Meter fitted with the 125 mm (5 inch) diameter impeller, but only those fitted with the 8011 series impeller, introduced from June 1981. A systematic error would result if the calibration were applied, incorrectly, to any other type of Valeport meter.
MANUAL-1550859975-1 | issue: 1.1 Reliability Over most of the flow speed range, above about 0.15 m/s, any particular BFM001 meter with 8011 type Impeller is expected (at 95 per cent confidence level) to perform within ±1.5 per cent of the indication of the group calibration.
Appendices Group Calibration of the 1178 Series Impeller As fitted to the Valeport "Braystoke" BFM002 flowmeter Summary It is customary to calibrate current meters individually, which is expensive and time consuming. For a family of physically identical meters a less costly and generally satisfactory alternative is a group calibration.
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