PERMFILE41557 - Laserfiche WebLink

Home Browse Search

• Section :70. 2.2.4 Revision Vo. 0 Date `lay 1, 1977 Paqe 7 of 17 when t::e :_'t~r is aligned and the =sceplate is in place, the cur wing nuts _re _ ~ntened lust enougn to revent leak- sge. S:ccessive tightening ma_: cause the f_lter to stick to the gasket and result in permanent damace to *_he gasket. The entire motor assembl;~ (sampler) is rotated and 'cowered to its normal operati:.g cosrtion, Ficure 4.2. 4.2 Operational Checks 4.2.1 Flow-Rate Measurements caith Rotame*_er Equipped Sampler - '4ake flow-rate measurements while t:ze sampler is at normal oceratir.c temperature. This requires a wa~-^.up time of a*_ least 5 :minutes before a valid measurement can be obtained. Connec= the rotameter to the sampler, using the same tubinc as •~~as used *_o calibrate, ar.d place or hold in a ver- tical position at eye level. Bead the widest Dart of the _float. [;se the calibration chart to convert the reading to • cubic metars per minute rounded to `_he nearest 0.0.3 m3/min., see :icure 2.12. _°low rates are measur=~ at tie beginning and end o` each samplinc period. additions measurements at different times during the sampling period ~y ~~ required in special instances, such as in those cases when non:inear loading on the filter occurs. For example if thF sam,•_zr is located near a source which only operates for a s eci'ic period over the total 24-hour samalinc period, ~i w measurements should be taken at the end of the specific ~eri~d. Precautions to be t~::en wt.er. making flow-rate measure- ments include: 1. after ccnnecti^- tha r_sme*_er to the sampl=_r, ob- se rye for at least one m_nute e'_pre to}:inn a rz_ding. :'_ .. •radual charge in *"low __te is .bserved do not _~::e a _eading until. ecuilibriu.-m is reached. crac•.:a] chan.:e wis.l • usual l_: be observed whet. the r,_ametar .s at a substantiall}• dlrfere P.t temDerd t'1re _~~..T. the sampler e:<n 3l:St a'r 3rd may require ~ tO 3 minutes tO epu-~_~r3t2.