Product Overview

CR87B FEATURES AND CONTROLS

1. The 3 DIGIT TEMPERATURE DISPLAY shows temperature of the environment

being monitored. When the batteries are nearly discharged, the display will

alternate the display reading and “LO” to advise the operator that the batteries

are discharged and the CR87B will shortly cease operation.

NOTE: The battery backup feature of the CR87B is primarily intended for use in

situations where primary power is lost for short periods of up to 48 hours. The

CR87B is not intended to be used as a battery powered instrument. If the CR87B

is to be stored for an extended period, it is strongly advised to disconnect the

battery pack and remove the batteries to avoid damage to the instrument from

battery leakage.

2. The TEMPERATURE RANGE SELECTOR allows the user to choose the desired

temperature range for measurement and recording.

3. The CHART SPEED SELECTOR allows the user to select the time of one full

chart revolution. The corresponding chart has to be chosen according to the

desired chart speed. Chart part numbers are listed in this manual.

4. The PEN POSITION ADJUSTMENT KNOB allows the user to adjust the position

of the chart pen.

5. The CHART ADVANCE BUTTON allows the operator to set the chart to the

correct time. Press and hold the chart advance button until the desired time lines

up with the Time Pointer. The chart is rotated counterclockwise only. CAUTION:

Movement of the Chart Spindle (Item 9) by hand may cause permanent

damage to the chart mechanism.

5a.The TIME POINTER

6. TEMPERATURE ADJUSTMENT feature allows the user to adjust the reading of

the digital display during periodic calibration. The CR87B has been factory

calibrated and requires no adjustment to meet all published specifications.

7. The POWER ON/OFF / CONTINUOUS / SINGLE CHART SELECTOR allows the

user to apply power to the CR87B and to select Continuous or Single Turn for the

chart rotation. When power is first applied to the CR87B, the display will show

“888” to test each segment of the display, and the pen will move to the edge of

the chart. The pen will then move to the correct position on the chart. 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 on the display (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