ThermoFlex-Manual - 第102页
Section 7 7-14 ThermoFlex Thermo Scientific
Section 7
ThermoFlex 7-13
Thermo Scientific
Verifying/
Adjusting the
Controller
PID Values
(Tune Loop)
The controller controls temperature using a Proportional-Integral-
Derivative (PID) algorithm. Should your chiller experience temperature
control issues, verifying/adjusting the controller's PID values may correct
the condition.
Note Thermo Fisher recommends that only a qualied technician adjust
the PID values. Incorrect values will hamper chiller performance.
• Pro
proportional value
P = % of span (100°C)
Range: 0.0 to 99.9
Factory Preset:
ThermoFlex900-5000
10.0
ThermoFlex7500-10000
20.0
ThermoFlex15000-20000
30.0
ThermoFlex24000
40.0
• int
integral value
I = repeats/minute
Range: 0.00 to 9.99
Factory Preset: 0.50
• dEr
derivative value
D = minutes
Range: 0.0 to 9.9
Factory Preset: 0.0
Figure 7-1 Verifying/Adjusting PID Values
indicates press and hold.
tunE
Pro
int
dEr
enter
StorE
xx.x C
mode
mode
CAL
mode
xx.x
xx.x
xx.x
xx.x
x.xx
x.x
enter
enter
enter
enter
enter
enter
Section 7
7-14 ThermoFlex
Thermo Scientific
ThermoFlex 8-1
Thermo Scientific
Draining
Section 8 Additional Information
Before using any uid or performing maintenance where contact with
the uid is likely refer to the manufacturer’s MSDS.
There are two different types of drain port, a ¼" brass Male NPT pipe plug
or a ¼" MPT Riton tting. If your chiller has both use the Riton tting.
Position a suitable pan beneath the drain port at the rear of the chiller. The
drain pan must be shallow (under 3½” in height) and have a volume of
approximately 3 gallons (6 gallons for ThermoFlex7500 - 24000). Remove
the ¼” Male NPT pipe plug from drain port or open the Riton tting by
turning either counter clock wise. For ThermoFlex7500-24000, open the
drain valve. This will drain the return line, reservoir, plate exchanger, and the
suction side of the pump.
To drain the discharge side of the pump disconnect the Female NPT outlet
connection on the rear of the chiller.
Note Internally the chiller does not contain a large quantity of uid on the
discharge side however take care to contain what uid does drain, a wet-vac
can be employed to minimize the potential for spillage.
If the chiller is equipped with the ow control or pressure relief with ow
control option, open the valve or remove the drain plug in order to drain the
discharge line, see Section 5.
If the chiller is equipped with the anti drainback option, enter the Setup
Loop and utilize the drAin display to open the valve, see Section 4. Opening
the valve allows the uid to drain out of the chiller.
Reinstall ¼” Male NPT pipe plug using a sealant suitable for the wetted
materials or close the Riton lling prior to relling.
Do not overtighten the tting.
For ThermoFlex7500-24000, close the drain valve.
WARNING
Figure 8-1 Drains
Brass plug (typical)
Riton connector
CAUTION