Omega Vehicle Security HH-21 User Manual

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10. HOLD

Hold Annunciator

This symbol will indicate that the instrument display is on hold.

11. SCAN

Scan Annunciator

This annunciator will be displayed when the instrument is sequentially
viewing T1, T2 and T1-T2.

3. FUNCTION KEYS

The ON/OFF key turns the thermometer on or off. To turn the ther-
mometer on, press the ON/OFF Key once. All the display annun-
ciators and segments should turn on momentarily (see Figure 2)
for visual checking. During this period the thermometer performs
internal diagnostics.

Following display test, if no input thermocouple is connected to
the unit, the display will indicate “OPEN”.

Plugging a thermocouple into the appropriate TC connector will
give actual thermocouple temperature readings.

If the unit is turning on for the first time after installation of a new
battery, it will default to K-type thermocouples, and °F readings
with 0.1° resolution.

NOTE: To obtain full accuracy, allow 1-2 minutes

after connecting a thermocouple plug, for
thermal setting.

To turn the thermometer OFF, press the ON/OFF key a second
time.

The TEMPERATURE SCALE key selects whether temperature
readings will be displayed in degrees Fahrenheit or degrees
Celsius. Upon initial power-up, the thermometer will display read-
ings in degrees Fahrenheit. To display readings in degrees
Celsius, press the TEMPERATURE SCALE key. To change back
to degrees Fahrenheit, press the TEMPERATURE SCALE key a
second time.

NOTE:
• Key selection is retained during power off.

°F

°C

OFF