Rev. 10/07
D
IC
K
SO
N
PEN HOME
If the pen(s) are located on the outside edge of the chart, press the PEN HOME to move pen(s) to recording
position. If the pen(s) are located on the chart, press the PEN HOME key to move the pen(s) to the outside
edge of the chart.
ALARM – (TH623/25)
To set the alarm, make sure unit is on and press and hold the ALARM button. The LED will blink red
rapidly for about five seconds, then the LED will turn solid green. Release the ALARM button and the
LED will turn solid red. At this point the display will show the following: ON or OFF.
Pressing either the ADJUST-UP or ADJUST-DOWN buttons, located on the back of the unit next to the
dip switch, will toggle the alarm on or off.
Pressing PEN HOME will scroll to the next alarm option. The options are as follows:
a. alarm on or off
b. pen 1 alarm min
c. pen 1 alarm max
d. pen 2 alarm min
e. pen alarm max
In order to set pen alarm minimums and maximums, pressing ADJUST-UP will increase the alarm value,
and pressing ADJUST-DOWN will decrease the alarm value. There is acceleration if the ADJUST-UP
button is held down. Repetitively pressing the PEN HOME button will scroll through the five options
until the alarm button is pressed to exit from alarm adjust. Each press of the PEN HOME or ALARM
button will store the new settings. The unit will take one minute to exit Alarm Set Mode once the
ALARM button is pressed.
If the alarm is triggered, the LED will show as solid red and the alarm will sound. Press the ALARM
button to silence Audible Alarm.
1.
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Continued on next page
TH621/22
ON/ OFF
PEN
HOME
(PWR) LED
Figure 2
ON/ OFF
ALARM
PEN
HOME
(PWR)
LED
TH623/25
Adjust Buttons
Relay Contacts
Battery
Compartment
AC
Adapter
Jack
Remote Probe
(TH623/625)
Figure 3
