Techne Liquid Calibration Bath - Manual

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7 You will need to remove the cooling coil when you are using
the thermoregulator on one of the Techne Calibration Baths.
Remove the screw which is used to fit the cooling coil to the
base of the unit. Keep the cooling coil in a safe place in case
you need to replace it.
A cooling coil is fitted to the bath. Connect a hose from a tap
to one end of the coil and from the other end of the coil to
drain. Adjust the water flow to give the required cooling.
8 For lower temperatures a Flow Cooler, such as the Techne
FC-200 or FC-500 is required.
See the instruction Manuals for these units for
connections and setup.
9 Fill the bath to between the minimum and maximum levels
stated in the specification.
If you are using oil at the highest temperatures, remember that
they will expand as the temperature rises. Even if you fill
the bath with oil to the minimum level, it may well
reach the maximum level before the top temperature
is reached. Take all precautions and monitor the level
through the full range.
If water is used, demineralised water is preferred to reduce
the formation of scale. If scale should form, use only mild de-
scaling agents to remove it. DO NOT attempt to hammer, chip
or scrape the deposits from the surface of the bath
10 Recommended liquids:
Temperature Liquid
-40
o C to 0 o C 40% water 40% ethylene glycol 20% alcohol
-20 o C to 30 o C 50% water 50% ethylene glycol
5 o C to 95 o C water, preferably de-ionised with neutral pH
10 o C to 150 o C Dow Corning Silicone Oil 200 series *
10°C to 250°C Dow Corning Silicone Oil 210H/100cs series *
* Warning: check gel life at top end of range.
Extraction may be necessary at high temperatures; always
check the manufacturer's data and safety sheets before
using any of the liquids.
In all cases the OVERTEMPERATURE CUT-OUT must be set
correctly for the liquid being used and the temperature at
which it is to operate
11 If you are using a low viscosity oil with a TU-20C controller,
the pump on the controller may be too powerful and cause
the oil to splash from the bath. There is a flow restrictor
supplied with the Calibration Bath. Push the "top hat"
restrictor into the outlet of the pump and fit the retaining plate
over it. Remove the appropriate screw from the pump and fix
the retaining plate with the same screw.
12 A bath that is fitted with a lid or insulating ball blanket gives
the best operating conditions. A lid or ball blanket will
prevent vapour loss, heat loss and give better temperature
control. If an open bath is used above 80
o C (ie where steam
or other readily condensing vapours are present) the
operation of the unit, particularly the digital display, may be
affected.
Below about 80
o C a cover becomes less important but will still
give better temperature control.
The Calibration Bath
Make sure you have read this manual carefully before you use
the thermoregulator.
Techne supply a range of liquid calibration baths from 5 to 12
litres on which you can fit one of the thermoregulator range of
units. The bath inner containers are manufactured from
stainless steel, for maximum corrosion resistance. The 5 and 7
litre baths are deep drawn with large easy clean corner radii.
The 12 litre bath is of welded construction.
The thermoregulator is designed to fit all standard laboratory
baths, especially Techne baths. It will heat, circulate and
safely control the temperature of the liquid in the bath within
precise limits.
See the Operator's manual for full operating details for
the thermoregulator.
Set Up
1 There are two modes of operation for the pump; circulation
internal to the bath; circulation external to the bath.
For internal circulation the blanking caps on the top of the
outlet and return pipes should be securely in place. They
screw on and, for safety, they may be tight.
For external circulation the blanking caps need to be
removed. With the blanking cap removed, and an external
circuit set up, the liquid will be split between internal flow
and external flow.
2 CAUTION: DO NOT SWITCH THE THERMOREGULATOR
ON UNLESS EITHER THE BLANKING PLUGS ARE FITTED
TO THE TOP OF THE PIPES or AN EXTERNAL CIRCUIT IS
FULLY CONNECTED.
IF YOU ARE PUMPING TO AND FROM A SECOND OPEN
BATH A RESTRICTION MUST BE PUT ON THE PRESSURE
SIDE OF THE PIPES. THE PRESSURE VOLUME IS GREATER
THAN THE SUCTION VOLUME AND YOU COULD OVER-FILL
THE SECOND BATH
3 Ensure that the bath is set up on a flat level surface.
4 Fit the unit securely to the bath. THE UNIT MUST ALWAYS
BE MOUNTED WITH THE BACK AND THE SWITCH END
OUTSIDE THE AREA OF THE BATH. This will reduce the
infiltration of hot vapours into the cooling system of the
thermoregulator. Ensure that at all times the air inlet and
outlet remain clear of obstructions. Free circulation of air
inside the unit is essential for proper cooling of the
electronics and pump motor.
5 The Thumb Screw secures the unit to the bath at the mains
Switch end.
6 If the pump has been set correctly for external circulation,
suitable hoses should be fitted to the outlet and return pipes.
A suitable hose must be capable of withstanding both the
temperature of operation and the liquid being used. Always
securely clip the hoses in place.
Material Allowable Temperature Range Comments
PVC
10°C to 60°C (50°F to 140°F) For water only
Silicone -40°C to 200°C (-40°F to 362°F)NOT for silicone oil
Viton
-20°C to 250°C (-4°F to 482°F)
Bath Sizes
Bath LCB-5 LCB-7 LCB-12
Overall Length A 351 mm 351 mm 351 mm
Overall Width B 260 mm 260 mm 260 mm
Overall Height C 183 mm 233 mm 358 mm
Opening Length D 140 mm 140 mm 140 mm
Opening Width E 140 mm 180 mm 140 mm
Max. Working Depth F 130 mm 140 mm 305 mm
Min. Working Depth G 90 mm 90 mm 265 mm
Maximum Capacity 5.0 l 6.5 l 12.0 l
Minimum Capacity 4.0 l 5.5 l 11.0 l
D
Cooling Coil
Standard Probe
Entry
E Lid
Thermoregulator
Fixing Point
A
C G F
B Drain Point
Working Environment
The units are designed to work safely under the following
conditions:
Ambient temp. range 5°C to 40°C
Humidity
Up to 95% relative humidity, non-condensing
Note: The control specifications quoted are for an ambient
temperature range of 10°C to 30°C. The specification
may deteriorate outside this range but the unit will still
work safely.
Radio frequency interference tested and passed to
EN50081-1.
Immunity Tested and passed to
EN50082-1