Calibration - Grant QBA Manual De Instrucciones

Calibration

The calibration procedure allows the user to calibrate the unit over a wide tempera-
ture range. Note that the probe used will be the probe selected as described on
page 8.
A calibrated thermometer will be required to measure the temperature of the block.
The adjusted readings entered must be within ± 5ºC of the original reading.
1 Set the temperature of the unit to 35°C in the normal manner and allow the unit
to stabilise.
2 Press F to enter main menu.
3 Rotate control knob until display shows . Press S to select.
4 The display will show  for one second then . Rotate to a value of
0004 and press S to select.
5 Rotate the control knob until the display shows . Press S to select.
6 The display will show the current temperature value. Using the control knob
change the value to match that of the calibrated thermometer.
7 Press S to select the new value. The display will revert to the non-adjusted ac-
tual temperature.
8 Set the temperature of the unit to 75°C and allow the unit to stabilise.
9 Press F to enter main menu.
10 Rotate control knob until display shows . Press S to select.
11 The display will show  for one second then . Rotate to a value of
0004 and press S to select.
12 Rotate the control knob until the display shows . Press S to select.
13 The display will show the current temperature value. Using the control knob
change the value to match that of the calibrated thermometer. N.B. If the read-
ing is over 3 degrees out the unit will continue to flash the display. In this case
turn the unit off and allow to cool. Then remove the blocks and clean the
heater bed and bottom of the blocks and start the procedure again.
14 Press S to select the new value. The display will revert to the non-adjusted ac-
tual temperature.
15 Press F to enter main menu.
16 Rotate control knob until display shows . Press S to select .
17 The display will show  for one second then . Rotate to a value of
0004 and press S to select.
18 Rotate the control knob until the display shows . Press S to select.
19 The display will now display the actual adjusted temperature using the calibra-
tion values entered.
To return to factory settings complete the following:
1 Press F to enter main menu.
2 Rotate control knob until display shows . Press S to select.
3 The display will show  for one second then . Rotate to a value of
0004 and press S to select.
4 Rotate the control knob until the display shows . Press S to select.
QBD, QBA, QBH,
Operating Manual
www.grantinstruments.com
28089 Ver 12
Page 10
EN