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AEC/Appllcatlon Engineering
RMTLED
The orange
RMT
(remote) LED lights when remote operation occurs. This LED is only on units
equipped with optional communications.
SHIFT LED
The orange
SHIFT
LED is not used on TrueTemp™ TDH units.
AT LED
The orange
AT
(Auto-Tune) LED flashes during the Auto-Tune sequence.
ALM LED
The red
ALM
(alarm) LED lights when the temperature at the process thermocouple is outside the
set alarm value.
Note: The alarm mode and value is factory-set to track plus or minus I 0°F/C
0
of the process set
point.
5-3
Control Keys
Figure 8
LEVEL Key
When you press this key for two seconds or more, you can then select the next of three indication
levels (0,
I,
and 2) to set specific control parameters. The control defaults to Level 0 on power
up.
(RMn REMOTE Key
Units with optional communications feature this key. For information on RS-232C, RS-422,
RS-485, or SPI communications, refer to the Communications booklet in your packet.
MODE Key
This key lets you scroll through parameters that can be set in Indication Levels 0 and I. For
example, in Level 0, you can call up the high/low temperature alarm (AL-2) so it can be set.
The factory alarm setting is plus or minus I 0°F /C
0
of the set point and is satisfactory for most
applications.
Page 36
TOH TrueTemp"' Serles Hot 011 Temperature Control Units
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