Lauda RP 845, Operating Instructions Manual

Page: 90 / 127

Proline Low-temperature Thermostats
90
Starting up
YACE0072 / 21.08.07
7.13.2.1 Proven settings for control parameters (External measurement probe):
External vessel
Master controller
(External controller)
Slave
controller
(Internal
controller)
Instru-
ment
Type Heat
carrier
liquid Description Volu-
me
[L]
Hose-
lenght
[m]
Kpe
DO
Tne
Dl
Tve
Ds
Tde
Dc
Prop_E
Da
Xpf
hO
Pump
Level
RP 845 Water
double wall glass vessel 2,5 2x1
2.0 80 60 5.0 30 4.0 5
RP 855 Water
double wall glass vessel 2,5
2x1
2.0 150 130 5.0 30 3.0 5
RP 855 Water
double wall stainless
steel vessel with water 0,7
2x1
0.5 70 50 5.0 30 3.0 5
RP 855 Ethanol
double wall glass vessel 2,5
2x1
2.0 150 122 15.0 30 3.0 5
RP 855 Ethanol
double wall glass vessel 2,5
2x1
2.0 150 120 15.0 30 3.0 5
RP 855 Ethanol
double wall glass vessel 2,5
2x1
2.0 125 107 15.0 30 3.0 5
Technical alterations reserved!
7.13.2.2 Steps for setting the control parameters for external control
1. Activate external control
Ì
7.7.4.
2. Setting the slave controller:
2.1. Set parameters to auto ; Xpf see table
Ì
7.13.2.1 (experienced data) depending on:
−
Check for thermostat type and change when necessary (RP....)
Ì
9.2.1,
−
Choose heat carrier liquid with low viscosity and high thermal capacity.
Ranking: water, ethanol, water-glycol, oil, Fluorinert®.
−
Set pump level as high as possible,
−
make bath circulation strong and fast,
−
choose hose length as short as possible, i.e. 2 x 1m,
−
choose hose cross section as large as possible, i.e. ½ inch,
−
throughput through the external load as large as possible.
2.2. Xpf setting:
−
when oscillating with short period occur (i.e. 30 seconds)
Î
Xpf lower, otherwise higher,
−
in case of bad thermal coupling and large thermal mass
Î
high (i.e. 2...5, or even higher),
−
in case of good thermal coupling and small thermal mass
Î
low (i.e. 0.2 ... 0.7),
−
when rapid temperature response is required simple internal control should be preferred.
Otherwise select small Xpf (0.05 ... 0.1).