Knauer WellChrom K-2600, User Manual

Page: 13 / 68

Operating the Photometer 13
be 500 nm with the preset conditions of 100 nm=1 V. This wavelength
value can then be modified with the arrow keys
∆
or
∇
, which creates a
second calibration point.
CONTROL
The instrument can be set to different external control modes. You can
choose between
KNAUER-NET , where the baud rate is currently
limited to 9600, RS-232, RS-485 and ANALOG . When choosing the
ANALOG option, only one wavelength can be used and controlled by
the analog input voltage. The operation screen is modified
correspondingly. The options RS-232 and RS-485 enable the use of a
RS-232 or a RS-485 protocol for controlling the instrument with a
terminal program.
The option KNAUER-NET is used when operating the K–2600 UV
detector as a stand alone instrument or for combinations with other
KNAUER instruments, e.g. for external control with the EuroChrom
software (see chapter „Software Control of the K–2600 UV detector“ on
page 26.
DATE/TIME
Allows setting system date and time.
FRACTION
This window provides you with the possibility to control a fraction
collector by using the event outputs of the K–2600 UV detector.
Additionally, signal levels to be exceeded for fraction collection and a
delay time respecting the dead volume of the capillaries between
detector and collector can be set.
Load Edit Prog Events: 2 Signal 1 Signal 2
Prog Clear 0 off 0 on 1 [au] [au]
FRACTION: delay: 090.0 s
level: 0.3205 au
Hold 0 Time
λ
1
λ
2
Run 1 [min] [nm] [nm]
Link
View
Setup
GLP
Fig. 9 Menu for setting up the fraction collector control
Enter a delay time in seconds in the first line. Set the events for control
of the in the second line, the event that controls the fraction collector
can be chosen. Possible values are
E1 or E2.
E1 activates a relay output, E2 a TTL output. The corresponding
connector on the rear side of the instrument can be connected to the
fraction collector.
In the field level you can set a minimum signal level that must be
exceeded before fraction collection starts. Both functions, level and
event , are evaluated in a logical and functions. This means, that the E1
output is activated when the level is exceeded during activation in the
time table of a method. In case of missing time programs the
appropriate event has to be set to „
1 ” in the operation screen. If fraction
collection is controlled by the signal level only, the event output
becomes active every time the signal exceeds the preset signal level.