Setup mode
Chapter 4
OPERATION MANUAL
V1.2.0en/12.05.15//14.06
Liability for errors and misprints excluded.
Unistat® T300 Series
59
Confirm your choice by tapping on “OK”.
Using the number keypad that appears, enter the time interval for the ventilation. The default is
0.5 minutes.
Confirm your entry by tapping on “OK”. Venting will start.
If, with externally closed applications (reactors), the fluid level in the fill level display remains the
same when the pump is running and when the pump has stopped, the application has been vent-
ed.
Stop venting. To do this, go to the category “Temperature Control”.
Tap on the category “Start/Stop”.
Tap on the dialog entry “Stop air-purge”.
Confirm your choice by tapping on “OK”. Venting is stopped and the pump continues to run for
approx. 30 seconds. Wait until the pump stops.
Close the
>Expansion vessel cap<
[22] by hand.
Venting
and
degassing
must be performed especially during commissioning and after changing the
thermal fluid. Only this ensures a trouble-free operation. After venting, follow the steps on page
59, section
»Degassing externally closed applications«
.
Note the volume expansion of the thermal fluid according to the working temperature range in
which you wish to work. At the “lowest” working temperature, do not go beyond the
minimum
mark of the
>Sight glass<
[23] and at the “highest” working temperature there should be no over-
flow from the
>Expansion vessel<
[18]. In case of overfilling, drain the excess amount of thermal
fluid (see page 61, section
»Draining externally closed applications«
).
4.4.1.2
Degassing externally closed applications
With a fluid mix, rapid heating can cause thermal fluid to suddenly escape from the >Expansion
vessel< [18]
COMBUSTION/PROPERTY DAMAGE
Due to the rapid heating of the low-boiling component contained in the mixture, a sudden
overflow from the
>Expansion vessel<
[18] is to be expected.
Hot surface on the >Expansion vessel< [18] in “degassing” setup mode
BURNS TO LIMBS
Do not touch the
>Expansion vessel<
[18] during “degassing” setup mode!
Wear your personnel protective equipment (e.g. temperature-resistant safety gloves, safety
goggles).
Inert gas blanket over the >Expansion vessel< [18] over 0.1 bar (g)
MATERIAL DAMAGE CAUSED BY MECHANICAL DAMAGE TO THE >EXPANSION VESSEL< [18]
When using the optional sealing sets for Unistate in connection with a static inert gas overlay, a
pressure limit of 0.1 bar (g) must be used.
When changing from a low-boiling thermal fluid (low-boiling components) to a higher boiling
thermal fluid, remains of the low-boiling component may remain in the temperature control unit.
Depending on the working temperature, the low-boiling component begins to boil, gas bubbles
form and cause the pump pressure to momentarily collapse. This may cause a safety shutdown.
The gas bubbles reach the
>Expansion vessel<
[18] and can escape via the
>Expansion vessel cap<
[22] and the
>Filling port<
[17]. Degassing removes the remains of the low-boiling component
from the thermal fluid.
For your temperature control unit, we recommend the inert gas overlay. For this purpose we offer
the sealing set for Unistats (Order No. 9402) in the Huber catalog.
A unistat protects the thermal fluid from environmental influences. Thus an accumulation of mois-
ture or an increased oxidative degradation of the thermal fluid is prevented. A static overlay by an
inert gas significantly further extends the useful life of the thermal fluids. This is especially true if
you want to work long-term near the operating temperature limits of the thermal fluids. (hygro-
scopy, oxidation).
