GE Monitor UPC-900 Operating Instructions Manual page 55

Autozeroing UV
The autozero function in the UV part of the module sets the detected absorbance to
zero when OK is pressed. Using autozero is recommended at the start before the sample
is injected.
Step
1
2
Create eventmarks
Eventmarks can be set and displayed as spikes on the UV curve, for example, when the
sample is injected. The spikes are 10% of the full scale AU setting.
Step
1
Monitor UPC-900 Operating Instructions 29-0567-16 AB
Action
From main menu 1, turn the dial one step clockwise to
select Autozero UV, then press OK. The normal ab-
sorbance value display is then shown.
In UNICORN, Autozero is set with the instruction AutoZe-
AU Cond%Tc pH
roUV in System Control:Manual:Alarm&Mon.
Lamp
(on)
Eventmark
Action
pH 12.50
From main menu 1, turn the dial two steps clockwise
to select Eventmark, then press OK. A spike on the UV
curve is created.
Set Parameters
Check
AU Cond%Tc pH
Lamp
Setup
(on)
Autozero UV
Alarm/Timer 00:22:24
pH 12.50
Set Cond Analog. Out
Set Parameters
Set Cond Zero Level
Check
Set Cond Full Scale
Setup
Set ph Analog. Out
Alarm/Timer 00:22:24
Set ph Full Scale
Parameter
Current value
Main menu 1
Main menu 2
Parameter
Current value
22.4
22.4
5 Operation
5.3 Common menu functions
Setup Cond ref temp
ESC
Display
Autozero UV
Setup Cond ref temp
Eventmark
Set UV Analog. Out
Set UV Range
Set UV Zero Level
Calibrate pH
(7.00–12.00)
Calibr pH Buffer 1
Calibr pH Buffer 2
ESC
55