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Operation
-
Monitoring
the External Event Operation
146
DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
Release M
April 2017
5.14 Monitoring the External Event Operation
Event pen function
If Function prompt “PEN 1IN” under Set-up prompt “PEN 1” has been configured as DGTL1 or DGTL2,
the pen (channel) operates as an “event pen” and tracks the remote contact (switch) closure by way of the
digital 1 or digital 2 input wired to the alarm output/digital input printed circuit board.
Event pen operation
When the switch opens, the pen for the channel tracks at the configured OFF position (0-100%) on the
chart.
When the switch closes, the pen tracks at the configured ON position (0-100%) on the chart and tracks at
this position until the switch is opened.
Thus, the “Event Pen” record makes it easy to monitor the on/off operation of an external event.
5.15 Maximizing Pen Life
Steps for maximizing pen life
Table 5-29 lists nine steps that will help to maximize the life of your chart pen.
Table 5-29 Maximizing pen life
Step
Action
1
Store the chart paper in a cool, clean dry place where the temperature does not exceed 40°C
(104°F) and the humidity is below 65% RH.
2
Do not expose the pen tip and chart paper to abrasive chemicals or dust that cause excessive
pen wear.
3
If the recorder is used in a dusty atmosphere, provide a positive ‘clean air purge’ to minimize
dust particle accumulation on the chart paper.
4
Periodically clean the pen arm using a cotton swab dipped in alcohol. This is more important
when the recorder is located in a dusty environment and no ‘clean air purge’ is used.
5
Never let the pen tip ride on the chart plate when the paper is not present. Use the pen lifter to
raise the arm when changing the paper.
6
Keep the door closed while recording.
7
Always insert the pen arm tip into the shipping sponge when storing or shipping the recorder.
8
Be sure that the chart paper lays flat against the chart plate. Any ripple in the paper will cause
light pen printing.
9
Be sure the chart hub assembly is pushed onto the motor shaft so that it is flush with the chart
plate.