Omega Engineering HH-21 User Manual page 16

The DISPLAY RESOLUTION key selects whether the tempera-
0.1°
ture readings will be displayed in high resolution (0.1°C or °F) or
low resolution (1°C or °F). At initial power-up, the thermometer will
1°
read in high resolution.
The THERMOCOUPLE TYPE SELECTION key selects which
K J
type of thermocouple the thermometer will be set up to use (Type
K, J or T). Upon initial power-up, the thermometer will be ready to
T
accept a K Type thermocouple. To change the thermometer to
accept a Type J thermocouple, press the THERMOCOUPLE
(or)
TYPE SELECTION key. Press the key a second time to select
Type T. To change back, press the key until desired type is dis-
SENSOR
played. Thermocouple probe plugs are color coded. Type K
Thermocouples have a yellow plug, Type J Thermocouples have
SELECT
a black plug, and Type T Thermocouples have a blue plug.
The HOLD key, when pressed, will "freeze'' the temperature read-
ings on the display. To get out of the Hold mode, press the HOLD
HOLD
key a second time.
The INPUT SELECTION/SCAN key selects which thermocouple
T1 T2
input the thermometer will display; thermocouple T1, thermocou-
ple T2 or the difference between thermocouples T1 and T2. Upon
T1-T2
initial power-up, the thermometer will default to channel T1. To
select channel T2, press the INPUT SELECTION key (input
selection annunciator
between the two inputs, calculated as T1 minus T2, press the
INPUT SELECTION key a second time (input selection annunci-
ator
To scan inputs T1, T2, T1-T2, press the INPUT SELECTION/
SCAN key a third time. (The SCAN annunciator will then appear.)
The unit will then sequentially display the readings of T1, T2, and
T1-T2. To return to T1, press the key again.
14
NOTE:
• Key selection is retained during power off.
NOTES:
• Key selection is retained during power off.
• To insure proper temperature readings, be sure
that the displayed thermocouple type matches
the type of thermocouple you are using.
will appear).
T1-T2
T2 will appear). To view the difference