Sentry Equipment Corp | Sample Sequencer
5
12 SPD 5.5.15
4.2.5 Valve Outputs:
Eight valve outputs are located on the Sample Sequencer board. These outputs supply 12 VDC to
operate the sample valves. The eight valves may be divided between four analyzers in any
combination.
4.2.6 Track and Hold Outputs:
Eight analog outputs are provided on the Sample Sequencer board. These outputs are 4-20 mA
outputs. When a valid reading is taken from the analyzer for a given sample, the Sample
Sequencer updates (“Tracks”) the corresponding signal on the appropriate output. When the
sample is not currently being analyzed, the Sample Sequencer “Holds” the corresponding signal on
the appropriate output at its last known value.
4.2.7 Digital Outputs:
A total of twelve digital outputs are available on the Sample Sequencer board. Four of these outputs
are used to replicate the four-analyzer alarm inputs while the remaining eight are used for sample
point indication. An “on” output indicates the point is currently being sampled and the analyzer
reading corresponds to that sample point.
4.2.8 Ethernet Communications:
The Sample Sequencer is capable of connecting to a network for communicating to a PC or control
system via MODBUS
®
TCP/IP. In addition, the sequencer provides the option to view settings via
embedded web. For more information on these features, refer to Appendix D.
4.3 Optional Manifold Sampling Valve
Although the Sample Sequencer may be used to control most manifold valve arrangements, the
Sentry Manifold Sample Valve offers a convenient optional accessory to obtain a representative
sample. The patented design incorporates block and bleed design and provides continuously
flowing samples with no areas for cross contamination to occur. The valve is available in either four
or eight sample line models. Contact Sentry for more information about this special sampling valve.
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