Metrohm 840 PC Control 5.0 / Touch Control User Manual

Page 77

Operation

PC Control / Touch Control

the 1st calibration position then it is essential that the other

calibration solutions are placed in the directly following rack

positions. If special beakers are used for the calibration then there

must be as many special beakers defined (see below) as buffers or

standard solutions are required for the calibration. The special

beakers do not need to be placed in rack positions that directly

follow each other.

• Rack offset: The rack offset is a tolerance value due to

manufacturing between the upper part of the rack and the bottom

part. The value is determined by a rack adjustment and displayed

here. If necessary it can be edited.

• The rack adjustment is started with [Adjust rack]. The procedure

is described on page 66.

• Under [Lift pos. Tower 1] and [Lift pos. Tower 2] the rack-

specific lift positions can be defined. These then apply for all rack

positions except those that have been defined as special beakers.

These positions can be moved to directly under manual control and

with the LIFT command. These lift positions can also be assigned

directly in manual operation after a move to the required lift height.

Only lift positions within the maximum stroke path can be entered.

This value is entered in the device properties of the tower. A lift

height of 0 mm corresponds to the "Home position", i.e. the lift is

being located at the upper stop position.

• [Special beaker] is used to specify the positions of the 16 special

beakers on the rack.

Select a special beaker and press [Edit].