HI-Q - Model S-275, R-275, #415, MR-5, MR-8, MR-12 & SK25 - Dry Gas Totaling Meters
HI-Q offers a wide range of dry gas totaling meters which, when incorporated in an air sampling system, are an excellent source for recording the total volume of air sampled. The gas-totaling meter may either be connected to have gas supplied through the inlet (connected to the exhaust of a positive displacement pump) or drawn through the outlet (connected on the vacuum side of an air sampling system). The direction of the flow must simply be maintained per the flow arrow indicator on the cover, i.e. inlet to outlet.
Test Meters are particularly advantageous in applications where minute amounts of gas must be measured with a high degree of accuracy. They are used in factories, laboratories, testing departments, and precision air sampling trains.
One of the more popular uses of this type of meter has been in the area of pollution control & sampling. The Environmental Protection Agency has set standards of performance for limiting gaseous and particulate emissions from factories. Federal, state, and local pollution control authorities have discovered a need for dependable precision instruments to sample and evaluate pollutants. Test Meters are being implemented in stack sampling and pollution monitoring equipment.
Test Meters come equipped with a special test index. This index has a sweep hand, which could be compared to the sweep hand on a stopwatch. The sweep hand circle is finely graduated so that accurate measurement of minute amounts of flow can be accomplished. Timing of the sweep hand also allows for the accurate establishment of small flow rates.
The test index used on the S-275 through the #415 has a sweep hand, which makes one revolution for each 1/10 cubic foot of gas consumed. It may easily be read to the nearest 0.005 cubic foot and has a maximum reading of 999 cubic feet.
Upon request, this group of test meters can also be equipped with an index whose test hand makes one revolution for one cubic foot of gas consumed.
All dry gas-totaling meters can be equipped with a bimetallic element that will automatically correct for changes in gas temperature and convert line volumes to the common base temperature of 60 F.
The fundamental difference in a temperature-compensated meter is the tangent. It features twin bi-metallic elements as the active or compensating members. The tangent is mounted in such a way that the volume of the meter. This automatically causes the meter to speed up or slow down as required and does not affect valve timing.
A temperature compensated meter can be outwardly identified by a difference in the manufacturer's badge color along with a 'TC' notation on both the badge and the meter index. Standard meters have blue badges. TC meters have red manufacturer's badges.
The typical temperature compensation performance is within an accuracy band of ±2% over a flowing gas temperature range of 20ºF to +120ºF.