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Sample Sequencer
Operation
Membrane Switch Keys
Sample Point Numbers (1-8): The eight sample point number switches turn a sample point on or off.
When the point is on, the adjacent LED will light and the sample point will be analyzed sequentially.
DISPLAY
: Pressing this key causes the function as indicated by the function lights to advance to
the next one down and back to the top. Normally the CYCLE TIME function is selected to keep
track of the analyzer cycling, or ANALOG mA output is selected to keep track of the analyzer output
value. The remaining functions are used predominantly for set up, troubleshooting or programming.
NEXT
: With functions: ANALOG mA output, LOW ALARMS, and HIGH ALARMS, there are eight
selections, one for each point. Pressing the NEXT key displays the next higher POINT value and
then back to one again.
ALARM RESET
: Resets all current alarms. Points will realarm if the current value is still in alarm.
Alarms can be from a low or high analog mA output value or from the analyzer system alarm. Eight
successive analyzer system alarms will force the Sample Sequencer to an "OFF" mode.
START/RESET
: If the key is pressed or the power is turned on, the Sample Sequencer resets,
reinitializes and restarts with the first on point. The previous programmed values are read in from
non-volatile memory.
PROGRAM
: Pressing this key starts and stops programming as described below. An internal lock-
out DIP switch on the I/O board (SW1-1 in Off position) can defeat this external key and lock-out
programming from the membrane switches.
Programming
In order to operate, the Sample Sequencer must be initially programmed. Programming is
accomplished either with the front display membrane switch keys or from computer signals via the
built-in RS-485 serial communications.
The following items are programmed to meet analyzer and operational requirements:
• Cycle time (or batch time-out when in the batch mode)
• Delay time
• Dwell time
• Low alarm levels for each point
• High alarm levels for each point
• Station number for communications
Except for station number, the above items can also be remotely programmed using the
communications software from a connected computer.
SENTRY Equipment Corp • P. O. Box 127 • Oconomowoc, WI 53066 • 262/567-7256 • FAX: 262/567-4523
Web: www.sentry-equip.com • e-mail: sales@sentry-equip.com
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