Grant Instruments SBB Aqua Plus - Manual (Page 13)

SUB, JB & SBB Aqua Plus 29825 Ver. 2 - July 2010 71W
Operating Manual Page 12
www.grant.co.uk
EN
5.3.10 Twin point calibration ()
The bath can also be calibrated using a twin point method to give you a linear correction
over the full temperature range. The process consists of three steps:
1. Set low point calibration value.
2. Set high point calibration value.
3. Confirm calibration settings.
The bath is not calibrated until all three steps have been completed. The greater the
difference between the low and high points, the better the calibration will be.
Low calibration point ()
1. Set the bath to a temperature between 20°C and 40°C and allow the bath to stabilise
for 20 minutes, indicated by the display not fluctuating by more than 0.2°C.
2. Measure the temperature of the water with a calibrated thermometer and make a
note of this reading.
3. Press the enter key. The display will show „‟.
4. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
5. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
6. Using the „+‟ or „-‟ keys adjust the display until the value displayed is the same as the
reading taken earlier.
7. Press the enter key to confirm the value and the bath will display „‟. Wait for the
bath to return to normal mode.
High calibration point ()
1. Set the bath to a temperature between 70°C and 90°C, allow the bath to stabilise, for
20 mins, indicated by the display not fluctuating by more than 0.2°C.
2. Measure the temperature of the water with a calibrated thermometer and make a
note of this reading.
3. Press the enter key. The display will show „‟.
4. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
5. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
6. Using the „+‟ or „-‟ keys adjust the display until the value display is the same as the
reading taken earlier.
7. Press the enter key to confirm the value and the bath will display „‟. Wait for the
bath to return to normal mode.
Setting the calibration ()
1. Press the enter key. The display will show „‟.
2. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
3. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key to apply the new
low and high calibration values.
The bath is now calibrated and the display will read the corrected value.
Restoring factory calibration ()
1. Press the enter key. The display will show „‟.
2. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key.
3. Use the „+‟ or „-‟ keys to navigate to „‟ and press the enter key to restore the
factory settings.