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Power

The TH8 operates on AC power with an optional 4 AA

battery backup. Depending on chart rotation selected and

model; battery backup will last

TH802/03/05

24-Hour Chart Rotation = 1 Day Backup

7-Day Chart Rotation = 2 Day Backup

31-Day Chart Rotation = 1 Week Backup

Note: Alarm and relays will not operate under battery

only power.

TH800

At 70°F

24-Hour Chart Rotation = 1 Month

7-Day Chart Rotation = 6 Months

At 32°F

24-Hour Chart Rotation = 3 Weeks

7-Day Chart Rotation = 4 Months

Note: (Unit should not be placed in an environment

below 32°F)

LED Indicators

• AC Power with battery backup–Solid green

• AC Power with low battery or no battery–Blinks red

• Battery only–Blinks green

• Battery only (Low battery) –Solid red

Note: TH800 operates on battery only and will blink

one time every minute to conserve battery life.

CALIBRATION

Your instrument was carefully tested and calibrated before

being shipped from the factory. For greatest accuracy, we

recommend factory re-calibration every 6–12 months. Call

customer service at (630) 543-3747.

If you wish to do calibration yourself, follow these

procedures.

1. To activate Calibration Mode, turn the unit on

and press and hold both the On/Off button and

the Adjust-Down button (making sure to press the

Adjust-Down button first so the unit will not turn

off). The LED will blink in amber rapidly for about

five seconds, and turn solid green. Release the

On/Off button and the Adjust-Down button. The

www.DicksonData.com • 1-800-323-2448 • Fax 1-800-676-0498

Temperature & Humidity Recorder

LED will then blink amber at which point only the pen

being adjusted will show on the display.

2. To raise the unit of measurement, press the

Adjust-Down button. To lower the unit of

measurement, press the Adjust-Up button.

Pen home switches between the red and blue

pens on a two-pen unit and stores the current

adjustment value.

3. When calibration is complete, press the On/Off

button. Calibration is stored in memory even after

you turn the unit off. User calibration information

will not be lost if AC power fails.

Note: After two hours, if no buttons are pressed, the

unit will time out of user calibration and resume normal

operation. The user calibration is stored separately

from the factory calibration. If you wish to cancel out

your user 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.

Note: It is recommended that you use a controlled

chamber when calibrating temperature and humidity.

Calibrating in an open room is not recommended as

humidity can vary greatly within a very small area.

NEED TO KNOW

TH800 Pen Movement

The pen movement for the TH800 is slower than on the

AC powered models in order to conserve battery power.

In 24-hour mode the pen will move every 1 minute and 30

seconds. In 7-day mode the pen will move every 8 minutes

and 30 seconds.

The recorder takes temperature readings every 50 seconds.

An average of the readings taken between pen movements

is what is drawn on the chart.

Pen Adjust

Pen adjust may be needed if the pen(s) and display do

not match.

1. While the unit is on, press and hold both the Pen

Home button and the On/Off button (making sure to

press the Pen Home button first so the unit will not

turn off). The led will blink rapidly between amber

and green for about five seconds. The LED will then

turn green. Release the Pen Home and On/Off

buttons. The LED will flash amber and green for one

second and the LED will turn off.

TH800/02/03/05