Thermo Scientific ThermoFlex10000, Installation, Operation And Maintenance Manual, Page: 111 / 210

Section 3
ThermoFlex 3-11
Thermo Scientific
Process Fluid
Requirements
Do not use automotive antifreeze. Commercial antifreeze contains
silicates that can damage the pump seals. Use of any fluid not
listed below will void the manufacturer’s warranty.

Approved fluids are:

Filtered/Single Distilled water

0 - 75% Laboratory Grade Ethylene Glycol/Water

0 - 75% Laboratory Grade Propylene Glycol/Water

Deionized water (3 M
Ω-
cm max, compensated)
For applications requiring resistivity greater than 1 M
Ω-
cm please call and
speak to an applications engineer for additional information.
Ethylene glycol (EG) is poisonous and flammable. Before using
any fluid or performing maintenance where contact with the fluid
is likely refer to the manufacturer’s most current SDS for handling
precautions.

EG is also hygroscopic, it will absorb water from its environment.
This can affect the freezing point and boiling point of the fluid over
time and may result in system failure.

To prevent freezing/glazing of the plate exchanger, ThermoFlex7500
through 24000 chillers require the use of 50/50 EG/water or 50/50
PG/water below 10°C process temperature.

When using a process fluid mixture of ethylene glycol and water or
propylene glycol and water, check the fluid concentration and pH
on a regular basis. Changes in concentration and pH can impact
system performance.

When using EG/water or PG/water, top-off with plain water. After
top-off check the fluid concentration.

Do not use a Deionization (DI) filter cartridge with Inhibited EG
or Inhibited PG. A DI filter will remove inhibitors from the solution
rendering the fluid ineffective against corrosion protection. Also,
inhibitors increase fluid conductivity.

WARNING
WARNING
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION