Environmental Express AutoBlock II - Manual (Page 28)

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Calibration Menu
6.3
Calibration of Sample Temperatures Variable A and Variable B
Introduction and Overview
Variable A and Variable B are selectable, preset sample digestion
temperatures. These two sample digestion temperatures are used in all
factory-installed digestion methods, and if desired, can be selected for use
in all custom/lab-designed methods.
Most environmental methods require a sample digestion temperature of 95°C
± 2°. Variable A temperature is designed to yield a sample temperature of 95°
± 2° C when the samples are digested in an open vessel, such as most waters
are.
Variable B temperature is also designed to yield a sample temperature of 95°
± 2° C when the samples are digested in a vessel with a reflux device (#SC506
Reflux Caps), such as most soils are.
Your AutoBlock’s Variable A and Variable B have been individually factory
calibrated to 95.0° C with a tap water matrix. 95.0° appears in the two boxes
on the PDA screen in the maintenance mode, temperature calibration screen.
Note: If the custom method(s) you choose to run does not include Variable A
or Variable B sample temperatures, see Section 5.3 of this manual. Section
5.3 explains setting sample temperatures in individual, custom methods.
(1) Changing Variable A and/or Variable B Temperature
To change Variable A and Variable B from 95.0° to a different temperature,
simply select the appropriate box, then type in the desired temperature.