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AEC/Appllcatlon Engineering
5
Controller Operation
5-1
Microprocessor Control
The TOH unit has an easy to operate microprocessor-based PIO control. When your process
reaches the set point, the PIO control cycles the cooling valve and immersion heater to maintain
a proper leaving fluid temperature.
The control has been fully factory tested. Once you set the desired process temperature set point,
the control does the rest. The built-in range of operation for the control is 100°F (38°F) to 400°F
(204°C) on TDH4 models and 100°F (38°F) to 550°F (288°C) on TDH5 models.
If
you want a
leaving fluid temperature to
be
outside these ranges on your TrueTemp™ TOH unit, consult the
AEC, Inc. Service Department to see if the range on your control may be altered.
5-2
Control Display
Figure 8
PVLED
During normal operation, the red PV (process value) LED indicator displays the actual process
temperature at the
DELIVERY
thermocouple. It lists parameters during setup and error messages if
an error occurs.
SVLED
During normal operation, the green SV (set value)
LED displays the process set point. It also displays
parameter and pre-set function values during setup.
HEAT LED
The orange
HEAT
LED lights when the control
energizes the immersion heater.
COOL LED
The orange COOL LED lights when the control
energizes the cooling valve .
TOH True Temp"' Serles Hot 011 Temperature Control Units
Figure 8
TOH Microprocessor Control
- P V -
DDD
- s v -
I
HaAT
COOL
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Page 35
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