The 931D PGC can be connected directly to an I/A Series system release 4.0 or later through an I/A Series Fieldbus. The Fieldbus can have either single or redundant configuration. Each 931D Process Gas Chromatograph (PGC) occupies one device on the Fieldbus. The PGC requires the I/A Series system to have either:
1.a Control Processor 30 (CP30), 50 Series Application Processor (AP), and a Workstation Processor (WP) or
2.a CP30 and a Application Workstation (AW)
The CP30 is capable of addressing up to 64 devices. The actual number of devices that can be supported is application-dependent. Refer to Foxboro I/A support services for details. Each analyzer requires one primary block in the CP. The primary block supports 12 data values and a corresponding 8-bit status word for each value. In addition, a 32-bit word is available for reporting alarm conditions
The analyzer is also capable of operating as a stand-alone unit. Direct interface to a CRT terminal, Printer, Modbus, or Personal Computer is available via the serial ports. A multifunction operator interface panel is a dedicated service panel providing a user-friendly, Window Oriented Interface (WOI) display for program editing. Dedicated function keys are available for fast maintenance functions. "Help" displays to simplify operator learning and troubleshooting are accessed via the multi-function keypad.
A secondary block provides for an additional 12 data values and a 32-bit word. As many secondary blocks as needed can be used to satisfy data requirements. In addition to data transmission from the PGC, provision for transmitting up to six real data values to the analyzer is allowed. For example, data that are used in calculations can be sent from one PGC to another on the network.
Sixteen digital inputs for monitoring the analyzer or sample conditioning functions are provided as standard. Inputs are sensed by contact closure to common ground. The inputs are assigned as follows:
1. Low carrier gas pressure
2. Low instrument air pressure
3. Low sample system pressure
4. Detector failure
5. Low calibration gas pressure
6. Low hydrogen fuel gas pressure (FID only)
7. Low zero air (FID only)
8. Low oven air pressure
9. through 16. Spare (user-assignable)
Digital outputs for reporting data or system alarms are optionally available. Up to thirty-two solid state or voltage free contacts can be specified. Solid state relays are normally open and rated at 3 A at 240 V ac. Voltage-free relays are normally open and rated at 0.5 A at 50 V ac or dc, noninductive, 12VA maximum
Up to twenty-four (24) analog outputs are optionally available. These trend outputs are used to report concentration data from any assigned stream and measured component (peak). Each output is an isolated 4 to 20 mA signal proportional to the measured range, updated at the end of the measured cycle
Two non-isolated analog input channels are available for reporting data from external (other) analyzers or measurement devices. The instrument can also accept 0 to 10 V dc signal range. The data values are then integrated into the system data reports or alarm formats from the 931D.
The FXi Series 5 Process Gas Chromatograph Featuring a new graphics interface front panel and open communication networking. Upgrade kits available for the Foxboro and FXi 931 series.
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