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2 OPERATION
2.1 General
The meter assembly is designed to complement the Capital Controls’ Series NXT3000 vacuum regulators.
The meter assembly is a variable area type meter and provides visual indication of the gas flow rate set by
the internally mounted manual rate valve.
The rate valve is located at the meter outlet (top) and is sized to match the meter capacity.
The capacity range of each flowmeter-rate valve assembly is clearly indicated by a calibrated scale, direct
reading in pounds per day (lb/d) and grams per hour (g/h) or kilograms per hour (kg/h), etched on the
flowmeter tube.
The meter assembly on a gas feed system with an automatic Chloromatic rate valve assembly will have the
rate valve knob glued in place on the outlet fitting.
NOTE: When two meter assemblies will be used in series, (one mounted on the vacuum regulator and one
remote mounted) one of the meter assemblies must be supplied as an automatic unit, without rate valve.
The second meter assembly will be supplied as a manual unit with rate valve.
2.2 Installation - See Figures 1, 2, 3 and 4
The meter assembly must be installed in an upright and level position in order to function properly.
Each meter assembly comes complete with the necessary o-ring seals, mounting feet and tubing fittings to
accommodate either mounting directly on a vacuum regulator or a wall. The parts supplied will allow the
meter assemblies to be ganged together to form a multipoint meter assembly of up to five (5) units. Tubing
connectors are also provided to allow using interconnecting tubing sizes of 3/8", 1/2" or 5/8".
For a manually controlled system the meter assembly is installed between the vacuum regulator and the
ejector. For an automatically controlled system the meter assembly is installed between the automatic
control valve and the vacuum regulator. Mount the meter panel using suitable screws, bolts and anchors
appropriate for the mounting surface.
When the meter assembly is to be mounted on a wall, locate if so that it is upright on a vertical surface
convenient for observation and operation.
Black polyethylene tubing is normally used for the vacuum line. Do not kink this tubing. It may be desirable to
use tubing connectors, tees or elbows to provide as direct run as possible and minimize kinking conditions.
Use enough tubing length to allow movement of the vacuum regulator for servicing or cylinder change.
When attaching tubing to the tubing fittings, tighten the connector nut HAND TIGHT.
General Design Note: Routing vacuum tubing through unventilated conduit is discouraged. A minute portion
of gas flowing through tubing under vacuum conditions, will slowly diffuse at a molecular level through its
walls and collect in the closed conduit over and extended period of time.
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