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RESTRICTION DEVICES:
For proper operation, all 3000 series analyzers require a flow restriction device. This device is typically a restrictor or a valve. The restriction device serves two functions in the sample path.
1.It is used to limit the flow rate of the sample through the analyzer. A restrictor is chosen to operate over a range of pressures and provide a useable flow rate over that range.
2.The restriction device provides a pressure drop. This device is selected to provide the only significant pressure drop in the sample path.
RESTRICTOR KIT
The current revision of the 3000 series analyzers are supplied with a kit containing two restrictors and a union which are user installed. These parts are supplied to give the end user more flexibility when installing the analyzer. The restrictor kit is suitable for high and low positive pressure applications as well as vacuum service applications (see manual for installation instructions).
The standard restrictor (BLUE DOT) is recommended for pressures between 5 and 50 PSIG. For positive low pressure application (5 psig or less) the unmarked restrictor is better suited. For unpressurized sample applications the marked restrictor should be used and configured for vacuum service.
Note: For extremely low positive pressure applications (less then 2 psig) the vacuum service configuration should provide higher performance (higher flow rates).
For vacuum service, the end user must supply a vacuum pump and a
3000TA EXAMPLES:
Example 1: With an incoming pressure of 10 psig the standard restrictor (blue dot) will provide a flow rate of 0.76 SLPM. Upstream of the restrictor the sample line pressure will be 10 psig, while down stream
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