If over time the pen location does not match the display, you may need to adjust the pen location on the chart. A PEN
HOME Adjustment will not affect calibration of the sensor, but rather corrects for the natural drift that occurs with
mechanical moving parts over time.
1. While the unit is on, press and hold both PEN HOME and ON/OFF buttons until the LED is solid green. Release the PEN
HOME and ON/OFF BUTTONS. The LED will flash amber and green for one second then the LED will turn off.
Note: Press PEN HOME first so the unit will not turn off
2. The pen will move to the outer edge of the chart, and then the red pen will move to the outer chart ring (maximum
temperature line). If the red pen tip does not line up with the outer chart ring, use the ADJUST-UP and ADJUST- DOWN
buttons (on the back of the unit) to move the red pen so that the pen tip is on top of the outer chart ring.
3. Once set, press ON/OFF to save and exit PEN HOME adjust.
Note: Pressing the ON/OFF button will exit the adjustment and return the unit to normal operation. Each time the
PEN HOME or ON/OFF button is pressed, the adjustment currently in progress will be stored. The unit will take one
minute to exit Pen Adjust Mode once the ON/OFF button is pressed.
The R400 Replaceable Sensor™ was carefully tested and calibrated before being shipped from the factory. For greatest
ac curacy, we recommend replacing the sensor every 6-12 months (does not include N400 and N450).
To order a Calibrated Replacement Sensor Call customer service at (630) 543-3747 or go to DicksonData.com.
When your new Replaceable Sensor™ arrives, simply turn off the recorder, remove and discard the old sensor, plug in
the new one and power the recorder back on. Your recorder will continue to record temperature and humidity without
interruption.
If you have an accurate standard to compare against, the Replaceable Sensor™ calibration can be adjusted at one point.
This will not adjust the span and is not as accurate as replacing the Replaceable Sensor™ with a newly calibrated one.
1. To activate Calibration mode, turn the unit on and press and hold both the ON/OFF and the ADJUST-DOWN button
until the LED is solid green. The LED will then blink amber and at which point only the pen being adjusted will show on
the display.
Note: Make sure to press the ADJUST-DOWN button first so the unit will not turn off
2. To raise the unit of measurement, press the ADJUST-DOWN button. To lower the unit of measurement, press the
ADJUST-UP button.
3. When Calibration is complete, press the ON/OFF button. The adjustment is stored in memory even after you turn the
unit off or if AC power fails.
Note: Hold ADJUST-UP or ADJUST-DOWN button for 1-2 seconds to increment readings.
Note: After two hours, if no buttons are pressed, the unit will time out of calibration mode and resume normal
operation. If you wish to cancel the calibration, simply enter calibration mode and toggle through the steps without
adjusting displayed readings. Exit by pressing the ON/OFF button. You have now restored factory calibration
settings.
Note: It is recommended that you use a controlled chamber when determining if calibration is necessary. Adjusting
the pen in an open room is not recommended as air flow can vary greatly within a very small area.
Note: User calibration invalidates Dickson’s Certificate of Calibration.
PEN HOME ADJUST
CALIBRATION
USER CALIBRATION
1. Flip pen arm up and away from chart. Slip your finger under the chart and lift the chart off the CHART HUB
2. Put one new chart on the recorder
3. Make sure the center of the chart, between CHART HUB, is not torn
4. Set the time by inserting a coin in CHART HUB and turning clockwise until the current hour is referenced by the
time indicator
5. Flip pen arm down
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46 50 5
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S D AY
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NOON
6AM
NITE
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ON
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6PM
DI
CKSON
PEN ARM
LCD DISPLAY
CHART GUIDE
CLIP
CHART HUB
CHART
PEN
CHART REPLACEMENT
PEN REPLACEMENT
1. Flip pen arm up
2. Slide used pen cartridge off pen arm
3. Slide new pen cartridge on pen arm
4. Make sure end of pen arm comes into contact
with pen tip
5. Remove pen cap
6. Flip pen arm down
PEN CARTRIDGE
PEN ARM
SLIDE OFF
TOP SIDE OF PEN
BOTTOM SIDE OF PEN
SLOT
PEN TIP
SLIDE ON
PEN ARM
4
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