Operating Information
Pens
The blue pen has a longer pen arm and records humidity or dew
point (depending on your dip switch selection, see page 6) and the
red pen has a shorter arm and records temperature. The pens are
offset to allow the red pen to glide under the blue pen. The blue
pen indicates the correct time and the red pen precedes it by 3/16˝
of an inch.
The pens move in increments across the chart as sensor readings
change. The display provides smoother and faster readings than
the pens. At any given time there may be a slight discrepancy in
the position of the pen and the reading on the display due to hys-
teresis.
For visual spot checks the display is more accurate than the pen
position but both are within the stated specifications of the units.
(See “Specifications” on page 2)
Pen Adjust
Pen adjustment may be needed if the pens and display do not
match exactly
1. Make sure the pen lifting bar is lowered and press the “Pen
Home” key.
2. Turn the chart hub clockwise rotating the chart.
3. With a small screwdriver loosen the pen adjust screw on the
pen arms and adjust the pen tips to the outer most circle on
the chart.
4. Retighten the screws. After pressing “Pen Home” again the
pens should now read correctly with the display.
Probe
The CR10 probe sits in the cradle in the back of the unit. The CR10
probe comes with the standard 8˝ cord. An extension cord can be
ordered to allow for remote sensing capabilities. (See
“Replacement Parts” on page 8)
Cord Installation
If you have ordered an extension cord for remote sensing capabil-
ities follow the instructions for cord installation listed below:
1. Turn the unit upside down or on its side so that you can see
where the probe connects to the back of the CR10.
2. Twist and pull the black rubber strain relief, beginning on the
back of the recorder body. (See “Instrument Anatomy” on page
4)
3. Slide the strain relief down the cord.
4. Inside you will see a standard connector which looks like a
phone jack. Using a small screwdriver, press retention tab and
the connector will pop out easily.
5. Remove wand from cradle by sliding upward. Repeat steps 1
through 3 for the portion of the cord that connects to the wand.
6. Return the wand to the cradle mounted position by sliding the
wand down into the cradle until it fits into the grips. The probe
can also be replaced by positioning it in back of the cradle area
and pressing it into the cradle until it snaps in place.
Power Supply
We recommend using AC power with four “D” batteries installed as
a back-up power source. This ensures that your recording will not
be interrupted when there is a power failure. When the instrument
is using battery power, the unit will update very slowly to extend
battery life. The 120V AC adapter plugs into the back of the
recorder beneath the probe cradle.
Display Symbols
Alarm is on.
LO BATT
Low battery indicator.
UC
User Calibration mode. This is displayed in the upper right hand
corner of the display.
Reading update indicator. These rectangles will flash along the bot-
tom of the display as long as the recorder is taking readings. If you
are using batteries as the power source the update indicator rec-
tangles will still flash but the rate will be very slow in some modes
and “B” will light on display. The rectangle furthest to the right is lit
continuously when the unit is using battery power.
MIN
This symbol is displayed when you are setting a minimum alarm or
when you have pressed the “Min/Max” key and the minimum value
is being displayed.
MAX
This symbol is displayed when you are setting a maximum alarm or
when you have pressed the “Min/Max” key and the maximum value
is being displayed.
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