Grant Instruments LTC4 - Manual (Page 33)

LTC4 31115 V1
Operating Manual Page 32
www.grantinstruments.com
7.3 How to prevent algae and bacteria?
Water baths provide the ideal environment for the growth of micro-organisms. If left
uncontrolled the growth of these organisms can result in a range of serious problems and
health risks from pathogenic bacteria.
The growth of algae on the surface of parts will cause biofouling which can reduce
performance.
Micro-organisms that produce acidic metabolic by-products can cause bio-corrosion by
depolarisation of metal surfaces.
There are a number of biocides available on the market.
8.0 Warranty information
When used in laboratory conditions according to this manual, this product is guaranteed
for THREE YEARS against faulty materials or workmanship.
Extended warranty for years four and five can be purchased by contacting our sales
department at [email protected].
9.0 Maintenance and service
9.1
Routine maintenance
The over-temperature cut-out on the control unit should be checked periodically by
turning the over-temperature dial with a screwdriver anticlockwise until the alarm lamp
comes on. The
control unit will also sound a buzzer and “Cut” will be shown on the
display. The over-temperature dial should then be turned to the maximum setting without
the alarm cancelling. The control unit should be powered off and back on to confirm that
the cut-out can be reset correctly. If the alarm lamp fails to light when the value indicated
on the over-temperature dial is more than 10°C below the current temperature as
indicated by the main display, then the unit should be checked by a competent person.
The float liquid level protection should also be checked periodically by lowering the level
of liquid in the bath and noting that the unit cuts out with the top turn of the heater still
immersed in the liquid.
When hoses are fitted to the pump they should be inspected periodically and replaced as
necessary to avoid hose failure.
No other routine maintenance is required.
9.2
Cleaning
Regular maintenance of the LTC4 unit is important to allow the unit to perform to its
specification and is required for warranty validity.
The removable grille of the refrigeration unit enables easy access to the condenser for
cleaning. Cooling power will be reduced if the fins become clogged with dust. The
condenser fins (see section 5.2.3) should be examined monthly and, if necessary, use a
vacuum cleaner nozzle and soft brush to remove the dust.