Startup Procedure; Verify Fluid Connections; Power-Up; Initial Zero - In-situ ChemScan mini UV254 Installation, Operation And Maintenance Manual

Startup Procedure

Verify Fluid Connections

Sample, Cleaning and Zeroing connections must be installed as indicated on the installation
drawing. Connections must be firm and vacuum-tight; air drawn into the system will cause
erroneous readings.

Power-Up

With proper connection made to 110/240 VAC, turn the analyzer ON by pressing the red
power switch located behind the front panel. (Access the switch by loosening the two
captive Phillips screws on the right side of the front panel.) The switch should illuminate.
Secure the front panel.
The LCD display will display the default sign-on message. At this point the instrument is
idle. Press the [MAIN MENU] key.
The display will now present four options. These four options are the only selections
available to the operator. The installer has access to several more.
The instrument must be allowed to stabilize for at least 20 minutes before zeroing.
While waiting, you may familiarize yourself with installation tools.

Initial Zero

In normal operation, the instrument automatically cleans, zeros and displays UV254 nm
absorbance. Prior to reading samples the analyzer must measure and record the initial,
(clean) flow-cell value to use for as a reference for autoclean decisions and diagnostics
Allow 20 minutes for the instrument to warm up.
Turn off the manual sample ON/OFF valve (the blue handle valve) to stop
1.
sample flow though the instrument.
Clean the flow-cell by selecting option [3] CLEAN. Press [2] for MANUAL
2.
cleaning. Press [+] to turn ON the pump, and pump for about 30 seconds.
Press [-] to turn the pump OFF, and allow the cleaning solution to remain in the
flow-cell for about 2 minutes. Press [MAIN MENU] to exit.
Press option [2] ZERO, then [1] MANUAL to pump zeroing solution into the flow-cell.
3.
The display shows the current (NEW) value and the previous (OLD) zero's
4.
signal levels in volts. NOTE: The new value will vary as it is displayed in real-
time. We have not entered this data yet, so disregard these values.
Press [+] to pump in zeroing solution. Activate pump for about 1 minute, then press [-]
5.
to stop the pump.
Observe the NEW value. As air bubbles, formed by the pumping of the zeroing
6.
solution, dissipate the value will stabilize.
If the NEW Value is between 1.5 and 4.9 and varying by less than 0.005, the
7.
cell is clean and usable.
Press [ENTER] to store the new reference zero. NOTE: The OLD value is now
8.
updated to match the new.
Press [MAIN MENU] to exit this procedure.
9.
Open the manual ON/OFF valve, closed in step1, to return sample flow to the analyzer.
10.
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