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corrected by adjusting the backflush needle valves. All needle valves were replaced; however, the issue remained. Removal and cleaning the valve 4 channel0 backflush valve rotor on 25 th May, appears to have resolved the issue. Non-linearity tests using a range of calibration tanks (including three NOAA
) The GC-MD performed reasonably well over the reporting period. The retention times of channel 1 and channel 2 species have a tendency to drift upward requiring periodic adjustment of the backflush balancing valve, particularly on channel 2. We have determined this is likely due to aging of the needle
Needles Old Battery, Isle of Wight, on 14 February * Excluding stations above 500 metres above sea level. 13 DAYS OF AIR AND GROUND FROST As a consequence of the persistently mild conditions through 2014 the number of days of air frost (see Annex 1 for definition) was typically 20 to 30 days below
Street. It occupied the four floors above a piano tuners shop and the basement and was recognisable by the display of noticeboards on the first-floor balcony giving the sea-state at Dover and the weather at Valentia, Scilly, Holyhead, Yarmouth and the Needles. Meteorological Office building at 63
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