FAQs
Scientific
t = V x Δ T x K
60 x W where:
t = Heating time (minutes)
V = Total liquid volume (litres L)
ΔT = Temperature difference (ºC)
K = Liquid heat capacity (J/L/ºC)
For water: K = 4200
For silicone oil: K = 1680
W = Heating power (Watt)
However, as the temperature decreases the cooling power of the circulator reduces, it is therefore necessary to estimate the average cooling power across the temperature range to be cooled.
Cooling power Watts = Cooling power at lower temperature + Cooling power at upper temperature/2
An example: For a 6 litre cooling bath with a cooling power of 1000W at +20°C and 500W at 5°C using water, the cool down time from +20°C to 5°C will be:
t = 6 x 15 x 4200 = 8.4 mins
60 x (1000+500)/2
t = V x Δ T x K
60 x W where:
t = Heating time (minutes)
V = Total liquid volume (litres L)
ΔT = Temperature difference (ºC)
K = Liquid heat capacity (J/L/ºC)
For water: K = 4200
For silicone oil: K = 1680
W = Heating power (Watt)
Example: A 12 litre bath containing water with a thermostat of 1400 W heating capacity can raise the temperature from +20ºC to +56ºC in 21.6 mins.
t = 12 x (56 -20) x 4200 = 21.6 mins
60 x 1400
The growth of algae on the surface of parts will cause biofouling which will 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.
Ultrasonic Bath
Placing items directly into the tank so that they are in contact with the base can cause damage to the bath. When instruments are in direct contact with the bath, the action of generating ultrasonic activity can cause excessive wear to the base of the tank. Using a Grant ultrasonic bath without a basket will invalidate your warranty.
Items should be placed in a stainless steel, mesh basket so that the ultrasonic activity is not significantly reduced.
The foil test involves suspending a strip of foil into various locations around the tank. The foil should not touch the base of the tank and should be held in position for around 1 minute. It should then be removed and there should be an even distribution of perforations and small holes on the surface of the foil.
Another test requires the use of Brownes soil test strips. These are plastic strips which have been contaminated to simulate the contamination which might affect surgical instruments. After running an ultrasonic cycle the strips should be taken from the bath and all contamination should have been removed.
An ultrasonic energy meter can also be used to test the level of ultrasonic activity within the tank.
Please contact Grant for more information on ultrasonic activity testing methods.
The lid is for the protection of the operator and in medical applications the patients also. It prevents aerosols generated during the cavitation process from dispersing and contaminating the reprocessing environment. In addition, the lid reduces the noise levels created during the ultrasonic cycle and helps to maintain the heat of the cleaning fluid in the tank.
Grant Bio
The UV lamps (TUV) will operate for approximately 8000 hours before degradation, once the lifetime has been reached the output will degrade quickly over a short period of time.
The power consumption of the UV cabinets are as follows:
UVC/T-M-AR 67W
UVT-B-AR 67W
UVT-S-AR 150W
The single fan air recirculation achieves around 7m³/h
