KROHNE OPTITEMP LCD-H20 EN - Manual (Page 10)

5
OPERATION
10
OPTITEMP LCD-H20
www.krohne.com 11/2011 - 4001594702 - AD OPTITEMP LCD-H20 R02 en
Operation
5.1 Normal mode
No settings are carried out on the display in normal mode.
5.2 Calibration
Simultaneously pressing the and keys for longer than 3 s opens the calibration menu. In
the calibration menu it is possible to calibrate the values for the zero point and the span of the
A/D converter on the digital display. Shorten loop circuit before starting calibration, refer to
Connection diagram on page 9, connection 3 and 4.
Step 1: Zero point calibration
• Select the C4 calibration procedure for zero point calibration from the calibration menu by
pressing the or key.
• Supply the input of the indicator with a current of 4 mA and wait until the display stabilises.
• Press the F key until "CAL" appears on the display.
i After a few seconds the new value for the zero point is displayed.
• Simultaneously press the + keys to exit the "zero point calibration menu" and continue
with full scale calibration.
Step 2: Full scale calibration
• Select the C20 calibration procedure for the measuring range from the calibration menu by
pressing the or key.
• Supply the display input with a current of 20 mA and continue as with the zero point
calibration.
CAUTION!
Only trained personnel with the appropriate equipment may adjust these settings. Incorrect
calibration influences the proper functioning of the indicator.
.book Page 10 Monday, November 21, 2011 10:31 AM