10 Sentry Equipment Corp
Calibration Hold and End-of-Batch Inputs
A calibration hold input indicates that the analyzer is performing a calibration.
Two calibration hold inputs are located in the sequencer enclosure.
In Continuous mode, when a calibration hold input is received:
– The sequencer waits at the active sample with the valve open.
– Once the calibration hold clears, the sequencer resumes operation, entering the Flush state for the sample that
was active before the calibration hold was received.
In Batch mode, calibration hold inputs do not perform a function.
Two end-of-batch inputs are located in the sequencer enclosure.
Without this input connected, the Sample Sequencer 6 does not advance to the next sample when the sequencer is
in Batch mode.
End-of-batch inputs are not used in Continuous mode.
Valve Outputs
Valve outputs supply 12 or 24 VDC to operate the sample valves.
Up to eight valve outputs are located in the sequencer enclosure.
The eight valves may be divided between two analyzers sequentially.
Track and Hold Outputs
Eight analog outputs (4–20 mA) are provided in the sequencer enclosure.
When a valid reading is taken from the analyzer for a given sample, the Sample Sequencer 6 tracks (updates) the
corresponding signal on the appropriate output.
When the sample is not currently being analyzed, the sequencer holds the corresponding signal on the appropriate
output at its last known value.
Digital Outputs
A total of eight digital outputs are available per IO board:
Four outputs are used to replicate the four analyzer alarm inputs
Four outputs are used for sample point indication.
An LED above the output indicates that the point is currently being sampled and the analyzer reading corresponds
to that sample point.
Ethernet Communications
The Sample Sequencer 6 is capable of connecting to a network for communicating to a PC or dedicate terminal
screen via a webpage.
Modbus communication protocol is available on request. Please contact Sentry for further information.
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