092008
30
If both functions have been started, the display of function „hea-
ting“ always has preference. If in this case the speed is changed
via rotary knob „Mot“ (not possible in
C
-mode of operation), the
display reverses to speed display for a duration of 5 seconds.
The mode of the display can also be changed by pressing foil key
„Mode“ once. After 5 seconds the display shifts back to tempe-
rature display.
If function „heating“ is switched off, and if the heating plate tem-
perature is higher than 50 °C, LED „Temp“ will be blinking green
(20% ON ... 80% OFF).
The digital display
changes constantly
from rated tempe-
rature °C
to rated temperature
HOT
The instrument is switched on by the mains switch on the left side
of the instrument (see fig. 1).
A self test cycle for all the safety functions is run and a recogniti-
on cycle of the temperature sensors connected up is also run.
• The ”Temp” and ”Mot” LEDs and the LCD display segments
flash for approximately 2 seconds.
• The software version number (e.g. ”
V000
”) is displayed.
• The status of the intermittent mode (
On/OFF Intermit
) and the
stirring bar breakaway monitoring (
On/OFF SAFE Rpm
) functi-
ons are displayed.
• The message
TEST Probe
is displayed.
• The operating mode (
A
,
B
or
C
) is displayed.
Switching on
8
• The temperature sensors connected up and identified are dis-
played:
PT OFF
No external temperature sensor connected up.
PT2 OFF
PT100 (single)
PT2 On
2x PT1000
• The safe temperature limit of the heating plate is displayed as
SAFE H xxx °C
(SV flashes).
•
SAFE H OK
is displayed.
• If external temperature sensors (PT 100 or PT 1000) are con-
nected up, their safe temperature limit is displayed as
SAFE P
xxx °C
(
SV
flashes).
• The message
SAFE P OK
is displayed.
The RET control-visc/C is supplied with the following default set-
tings:
Operating mode
A
Setpoint temperature
0
°C
SAFE H
350
°C
SAFE P
350
°C
Setpoint speed
50
rpm
Intermittent stirring mode
OFF
Cycle time (at setpoint speed)
60
sec.
(*)
Interruption (at 50 rpm)
10
sec.
(*)
Stirring bar breakaway monitoring
OFF
Error 5 response time
180 sec.
(*)
PT 100 temperature sensor
0
K
(*)
offset
PT 1000 1 temperature
0
K
(*)
sensor offset
PT 1000 2 temperature
0
K
(*)
sensor offset
(* = can only be modified via serial interface)
Default settings
9
3386500a_RETcv_092008:RET contr visc_04 06.10.2008 13:43 Uhr Seite 30
