Grant GLS Aqua Plus, Operating Manual

Page: 14 / 94

29339 Ver. 3 GLS Aqua Plus
Page 13 Operating Manual
www.grant.co.uk
6.0 Technical specifications
Operating conditions
Ambient Temperature 5 to 40°C
Maximum relative humidity 80% R.H. in room temperatures up to 31°C
decreasing linearly to 50 % R.H. at 40°C
Altitude above sea level Up to 2,000 m (6,500 ft)
Operating Enviroment Indoor use only
Electrical details
Mains supply:
230V @ 50/60 Hz or 120V @ 50/60 Hz
Pollution degree: 2
Installation Category: II
Note: Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply
voltage.
Models Capacity (L)
Current Rating (A)
120V 230V
GLS Aqua 12 Plus 12 5.8 2.8
GLS Aqua 18 Plus 18 8.5 5.4
GLS Aqua Plus bath performance
Temperature range 5°C above ambient to 99°C
Shaking speed range 40 to 400 strokes/min
Display (also used for setting) 10.0 to 99.0°C in steps of 0.1°C
Temperature stability to DIN 12876 ± 0.2°C
The maximum shaking speed for a particular application will depend on the number and
size of vessels in the shaking tray, and the depth of the water.
7.0 Technical Tips
7.1 Which water should you use in your bath?
For the long-term reliability of water baths it is important to use oxygenated water that is
free from ions and minerals that can cause corrosion of stainless steel. We recommend
the use of distilled water and de-ionised water from modern ion exchange systems that
do not use salt back flushing to regenerate the ion-exchange cartridges.
Stainless steel is protected from corrosion by a layer of chromium oxide. If the layer is
damaged, oxygen present in water can reform the oxide layer. If the water is still or de-
oxygenated, and the oxide layer is damaged, ions can corrode the stainless steel tank. If
a water bath has been unused for some time, or water boiled, we recommend changing
to fresh distilled water or correct de-ionised water.
Water normally contains calcium or magnesium ions. De-ionised water has most ions
removed as indicated by its conductivity level; the purer the water the lower the
conductivity. It is important to use only de-ionised water from an ion exchange system
with replaceable cartridges. Do not use de-ionised water generated from an ion-