CR87HT High Temperature Recorder
6.
TEMPERATURE ADJUSTMENT
feature allows the user to adjust the digital
display during periodic calibration and certification. The CR87HT has been
factory calibrated and requires no adjustment to meet all published specifi-
cations.
7.
POWER ON/OFF / CONTINUOUS / SINGLE CHART SELECTOR
allows
the user to apply power to the CR87HT and to select Continuous or Single
Turn for the chart rotation. When power is first applied to the CR87HT, the
display will show "888" to test each segment of the display, and the pen will
move to the edge of the chart. The display will then show the temperature at
the thermocouple sensor and the pen will move to the correct position on
the chart. If the chart range does not match the temperature at the thermo-
couple sensor the pen will move to the upper or lower range of the chart,
whichever is closest to the temperature at the sensor, and stay there until
the correct chart range is selected or the temperature at the thermocouple
sensor moves within the range of the chart being used. In the Continuous
switch position, the chart will rotate until power is removed. In the Single
Turn switch position, the chart will make one complete revolution and stop.
A blinking dot (Item 1) will indicate that the chart has made one complete
revolution and stopped.
To reset the chart for another revolution,
place
the switch in the Continuous switch position until the blinking dot goes out
and then slide the switch back to the Single Turn position. The chart will
make one complete revolution and stop.
DO NOT
move the pen by hand or interrupt the pen movement. Failure to
observe this will cause the pen to read incorrectly and may result in damage
to the pen mechanism.
8. The
RECORDING PEN
contains special ink. The pen has a wrap-around arm
latch which makes the pen replacement "A SNAP!" To replace the pen, gently
lift up the PEN ARM, (do not over bend pen arm) release the pen latch by
pushing it down, and remove the pen; place a new pen on top of the pen arm,
align the notches on the pen arm with the notches on the pen latch and close
the latch by wrapping it around the pen holder until it is secured. Replace cap
on the pen tip when the CR87HT is not used to insure long pen life.
For pen
installation see Fig. I
9. The
CHART SPINDLE
holds and rotates the chart during the recording op-
eration.
DO NOT ROTATE THE SPINDLE BY HAND AS IT MAY DAMAGE
THE INTERNAL MECHANISM.
10. The
PAPER CHART
is 6 inches in diameter. Replacement charts are avail-
able from any of Sealed Unit Parts Co., Inc. authorized distributors in a box
of 60 charts each. The chart part numbers are listed in manual.
TO INSTALL A NEW CHART
disconnect power from the CR87HT by se-
lecting
OFF
with the Power/Single/Continuous Chart Selector. Place pen
cap on point. Gently lift the pen arm, and while holding it, remove the old
chart. Slide a new chart under the pen holder and align the chart with the
CR87HT High Temperature Recorder
chart spindle. Apply power to the CR87HT and rotate the chart by depress-
ing the chart advance button until the time pointer is aligned with the line on
the chart representing the right time of day. Remove pen cap. If necessary,
adjust the pen position according to the front panel display reading (see
PEN POSITION ADJUSTMENT KNOB Item 4).
11.. T
TIME POINTER
is simply a point against which the current time is being
read during a chart rotation. Initially a new chart has to be rotated until the
time pointer shows the right time and day when using a 7 day chart.
12.. T
HANDLE
for carrying, folds towards the back of the case to be out of
the way when CR87HT is mounted on the panel or on the wall.
13.
KEYHOLE SLOTS
located on the back of the case are provided for wall or
panel mounting.
14.. T
REAR COMPARTMENT
was designed to store the battery holder for
battery backup as well as the connection for the adapter box.
15.. T
THERMOCOUPLE SENSOR
is interchangeable. The furnished sensor
has 15 feet of cable. The sensor is a type J thermocouple and uses the in-
dustry standard connector for thermocouple sensors. Different sensors from
third party manufacturers may be used, but Supco can not be responsible
for the quality or accuracy of any sensor not manufactured by Supco.
The recorder should be placed outside the chamber being monitored.
DO
NOT
PLACE THE RECORDER DIRECTLY IN AREAS OF EXTREME
TEMPERATURES, HIGH HUMIDITY OR HEAVY CHEMICALS.
16.. T
BATTERY HOLDER
is stored in the rear compartment for backup bat-
teries. Use of alkaline "AA" batteries is required for proper operation.
17.
12VDC WALL TRANSFORMER
provides primary power for the CR87HT.
Alternate sources of 12 Volt power may also be used. This allows use of the
CR87HT in automotive, marine or other mobile applications.
18.. T
POWER CONNECTOR
is a connection jack for the 12VDC wall trans-
former or alternate source of 12VDC power.
19.. Snap
EXTRA SUPPORT LEGS
for better stability.
