Techne Liquid Calibration Bath User Manual

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)

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 de­scaling 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

-40oC to 0oC 40% water 40% ethylene glycol 20% alcohol

-20oC to 30oC 50% water 50% ethylene glycol
5oC to 95oC water, preferably de-ionised with neutral pH
10oC to 150oC 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 80oC (ie where steam
or other readily condensing vapours are present) the
operation of the unit, particularly the digital display, may be
affected.

Below about 80oC a cover becomes less important but will still
give better temperature control.

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

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D

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E Lid

C G F

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B Drain Point

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A

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Cooling Coil
Standard Probe

Entry

Thermoregulator
Fixing Point

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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

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Additional Information

NOTE THAT THIS EQUIPMENT SHOULD ONLY BE DISMANTLED
BY PROPERLY TRAINED PERSONNEL. REMOVING THE TOP

CASE EXPOSES POTENTIALLY LETHAL MAINS VOLTAGE.

THERE ARE NO OPERATOR MAINTAINABLE PARTS WITHIN
THE EQUIPMENT.

In the unlikely event that you experience any problems with
your Thermoregulator which cannot easily be remedied, you
should contact your supplier and return the unit if necessary.
Please include any details of the fault observed and remember
to return the unit in its original packing. Techne accept no
responsibility for damage to units which are not properly
packed for shipping: if in doubt, contact your supplier.

Operator maintenance

1. Cleaning

Before cleaning your unit ALWAYS disconnect from the

power supply and allow to cool below 50° C.

Your Thermoregulator can be cleaned by wiping with a

damp soapy cloth. Care should be exercised to prevent

water from running inside the unit. Do not use abrasive

cleaners.

2. Overtemperature cut-out

The overtemperature cut-out is a sensitive mechanical

device and mechanical shock can cause it to trip.

• In the event of no heater power, check the mains plug and

lead, then reset the cut-out control.

• Repeated operation of the cut-out indicates a serious fault:

you may need to return the unit to your supplier for repair.

3. Fuses

Your unit is protected by two fuses.

For the approriate fuse see the User's Manaul for the unit.

These should only be changed by suitably qualified

personnel.

If the fuses blow persistently, a serious fault is indicated

and you may need to return the unit to your supplier for

repair.

Accessories

There are many accessories both for the thermoregulators
and the baths. These are constantly being updated and
details can be found in Techne Sales literature. However they
do include:

Flow Coolers

FFC2D FC-200 230V UK
FFC2D FC-200 230V Europe
FFC2P FC-200 120V
FFC5D FC-500 230V UK
FFC5D FC-500 230V Europe
FFC5P FC-500 120V

FTU232 "Thermsoft" kit inc: disc, cable and

connector for TU-20C

Contact Information

For technical, sales or servicing information, contact your local
Techne dealer or,

Barloworld Scientific Ltd
Beacon Road, Stone
Staffordshire
ST15 0SA, United Kingdom
Telephone: [phone]
Fax: [phone]
e-mail: [e-mail]

or,

Techne Inc, 3 Terri Lane,
Suite 10, Burlington,
New Jersey 08016, USA.
Telephone: [phone]
Toll free: 800-225-9243 ext 306
Fax: [phone]
e-mail: [e-mail]
Web site: www.techneusa.com

Liquid Calibation

Baths (LCB)

Reference Card

WARNING

Warning: HIGH TEMPERATURES ARE DANGEROUS
Avertissement: DANGER DE TEMPERATURES ELEVEES
Warnung: HOHE TEMPERATUREN SIND GEFÄHRLICH
Aviso: LAS TEMPERATURAS ELEVADAS SON PELI

Issue 5

Date of issue:

3rd May 2005

Techne is a trade mark

© Techne 2002