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5
Operation
Although all four test cells share a single Nitrogen source, they each have
two regulators for adjusting drive pressure and back pressure. Each cell also
has a separate temperature controller.
There are two main power switches on the front of the instrument. The switch
on the left controls power to the two cells on the left. The switch on the right
controls power to the two cells on the right.
The valve on the front controls the flow of Nitrogen pressure to the regulators.
When the valve is horizontal, the pressure is turned on. When it is vertical,
the pressure is turned off.
1. Before starting a test, make sure the Nitrogen valve is off (vertical).
Turn off both Main Power switches and all four Heat switches. Make
sure all regulators are backed off completely. Turn them completely
counterclockwise.
2. Turn the Main Power switches on.
3. Press the up and down arrows on the temperature controller to set the
desired test temperature.
4. Turn the Heat switch on. Each cell has a separate Heat switch.
The light next to the cell will turn on when the heaters are engaged.
5. Be sure all of the o-rings are in good working condition (pliable with
no nicks or cuts, etc.), and are not damaged during the assembly
procedures. Place a thin film of silicone grease on all o-rings.
Nitril-NBR (Buna N) o-rings (#170-13) are recommended for tests up to
250°F (121°C). For tests up to 400°F (204°C), Fluorocarbon/FKM (Viton
®
)
o-rings (#170-13-3) are recommended. For tests up to 500°F (260°C),
Perfluorocarbon (FFKM) o-rings are recommended. Also, for tests with
water-based fluids containing
no hydrocarbons
, Ethylene propylene
(EPM/EPDM) o-rings may be used up to 400°F (204°C).
Thermocouple
Hole
Power to Left Side
Power to Right Side
Nitrogen Valve