JULABO FP51-SL Ultra-Low Refrigerated Circulators - Manual (Page 30)

Safety installations, warning functions
30
8.0.1. Early warning system, low level protection
DBGM: 20306059.8
This low level protection is independent of the control circuit and is
divided into two sections:
1. Switch in stage 1 recognizes a critical fluid level
.
An audible warning (interval tone) sounds and a message
appears on the VFD COMFORT-DISPLAY.
Refill bath fluid!
2. Switch in stage 2 recognizes a low fluid level
.
If stage 2 of the low level protection device (according to IEC
61010-2-010) is triggered, a complete shutdown of the heater
and circulating pump is effected.
A continuous alarm tone sounds and a message >ALARM<
>CODE 01< appears on the VFD COMFORT-DISPLAY.
Press for help on the LCD 
Turn off the unit with the mains switch, refill bath fluid and turn
the unit on again!
3. Float
4. Circulating pump
5. Heater
Warning:
For refill always use the same bath fluid type that is already in the bath.
Bath oils must not contain any water contaminants and should be pre-heated to the
actual bath temperature! Explosion hazard at higher temperatures!