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3.1.2 Flow the cooling water
S-4800 requires water flow for cooling the objective lens coil. It is necessary while the Display
unit is powered on. A water valve is provided and is open when the S-4800 control program
starts up. It is closed when the POWER switch of the display unit is turned off.
(1) When supplying water by city or site water source
Open the water source valve before turning the display power to on. If the display is started, a
message will be shown (Objective lens over heat or water is not supplied). Check and flow
water.
(2) When using a water circulator
If the circulator power is linked with S-4800, It will start running when the S-4800 control
program starts up.
If it is not linked, turn the circulator power to on before starting S-4800 control program.
(3) Adjusting water flow
Water flow will be indicated on the Evacuation control panel. Set the indicator to initial status
( no indication) with pressing MODE switch and repeat pressing the SELECT switch so as the
indicator show [F X.X]. The X.X shows water flow in Litter / minute. For example F 1.5
indicates 1.5 L / minute. Allowable water flow is within 0.9 to 2.1 L / Minute.
To adjust water flow, adjust the knob of the flow adjustment valve provided at the back of the
Main unit. To monitor the water flow, four lamps are visible through the window of the rear
cover.
Water flow adjust valve Monitoring window Monitoring lamps
The four lamps will lit as follows.(☼ shows lighting lamps)
● ● ● ● : 0 L / minute
●☼☼☼: 10.5 L / minute ← minimum value
☼● ● ● : 1.2 L / minute
☼● ●☼ : 1.35 L / minute
☼●☼● : 1.5 L / minute ← nominal value
☼●☼☼: 1.6.5 L / minute