Operating Manual (PDF) - John Morris Scientific

Preparations
3.2.1. External control
Pt100
The recirculating cooler is intended for internal and external temperature
control. Switching is carried out in the submenu >Control< (see page 30)
IMPORTANT: Measures for external control
For external control and temperature measurement an external
Pt100 sensor must be connected to the socket (17) on the rear of the
recirculating cooler.
Order No. Description Material cable
8 981 003 200 x 6 mm dia., stainless steel 1.5 m
8 981 005 200 x 6 mm dia., glass 1.5 m
8 981 006 20 x 2 mm dia., stainless steel 1.5 m
8 981 010 300 x 6 mm dia., stainless steel 1.5 m
8 981 013 600 x 6 mm dia., stainless steel/Teflon 3 m
8 981 014 1200 x 6 mm dia., stainless steel/Teflon 3 m
8981103 Extension cable for Pt100 sensor 3.5 m
8 981 020 M+R in-line Pt100 sensor
The M+R in-line Pt100 sensor is a flow sensor and can be installed in
the loop circuit.
Pt100
M+R
3.3. Bath fluids
Caution:
Carefully read the safety data sheet of the bath fluid used, particularly with regard to
the fire point!
If a bath fluid with a fire point of ≤ 65 °C is used, only supervised operation is possible.
Water:
The quality of water depends on local conditions.
Ferrous water can cause corrosion - even on stainless steel.
Chloric water can cause pitting corrosion.
Water/glycol mixture:
Water evaporates and thus the mixture may become flammable. In the heating phase,
a fire may be caused due to the hot surface temperature of the heater.
Fill up water in time and check the mixing ratio in regular intervals (e.g. using an
appropriate device).
Recommended bath fluids:
Bath fluids Temperature range Flash point fire point
water 5 °C ... +80 °C
mixture water/glycol -30 °C ... +50 °C
JULABO Thermal G -30 °C ... +80 °C ---
JULABO Thermal H5S -50 °C ... +105 °C >110 °C >130 °C
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