Dickson TH8P Manual V14 052418
7
The recorder takes temperature readings every 50 seconds. An average of the reading taken
between pen movements is what is drawn on the chart.
TROUBLE SHOOTING
TROUBLE SHOOTING
TROUBLE SHOOTING
TROUBLE SHOOTING
Why isn't the chart keeping time or running slow?
Why isn't the chart keeping time or running slow?
Why isn't the chart keeping time or running slow?
Why isn't the chart keeping time or running slow?
•
The chart may be hung up or restricted, possibly caused by a rip on the outer edge of the
chart or the chart hub, or the chart may be caught between the arm and pen arm
platform.
•
Incorrect chart installed for the selected chart speed.
Why did the chart stop turning?
Why did the chart stop turning?
Why did the chart stop turning?
Why did the chart stop turning?
•
Chart hung up or restricted, (ripped chart)
•
Unit may be "locked up", this can be confirmed by pressing any of the buttons on the
keypad, if the unit is locked up there will be no response to button presses and the Chart
Recorder may appear to be working, but the readings won't change, also the chart will
not rotate. Remove power and battery, and then re-power.
Why don't the display and chart match?
Why don't the display and chart match?
Why don't the display and chart match?
Why don't the display and chart match?
•
Dip switches set for a specific range, but using chart for another range, or vice versa.
•
Pen(s) not inserted on pen arm(s) all the way
•
To adjust pen to match chart see “Pen Home Adjust” in this manual.
Why does the display read PROB?
Why does the display read PROB?
Why does the display read PROB?
Why does the display read PROB?
•
Check the TH sensor pod. Make sure it is properly plugged into the unit.
•
Is the unit locked up? This can be confirmed by pressing any of the buttons on the
keypad, if the unit is locked up there will be no response to button presses and the unit
may appear to be working, but the readings won't change, also the chart will not rotate.
Remove power and battery, and then re-power.
Why does calibration seem to be of
Why does calibration seem to be of
Why does calibration seem to be of
Why does calibration seem to be off?
f?
f?
f?
•
What is the tolerance of the unit it's being compared to?
•
It's ok if the unit is within the sum of the two tolerances.
•
Has an outside calibration house attempted calibration? It may not have been adjusted
properly.
•
Walk through calibration adjustment, found in the manual
Why won't the battery back
Why won't the battery back
Why won't the battery back
Why won't the battery back----up work?
up work?
up work?
up work?
•
Are there good batteries in the Chart Recorder?
•
Keep in mind that battery back up varies significantly depending on temperature, pen
movement and chart rotation speed.
•
If there was a momentary power outage (Brown out), the unit may not have had enough
time to recognize this and switch to battery mode. (The Chart Recorder may lock up or
shut off in this situation) This situation may also occur if the unit is plugged into an outlet
that shares the circuit with other machinery that has phase motors or compressors that
cycle periodically. As these other machines cycle, they momentarily have a high current
draw, therefore drawing from the unit.
