Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 45)

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Section 4 Sampler operation
4.1 Power on and power off
Important Note: The AC power supply will become overheated if
the sampler pump is operated continuously. Refer to
3.5.1 AC
power installation on page 38 to determine the time interval that
must be allowed between sample cycles to prevent damage to the
AC power supply and/or to prevent a burn hazard.
Power on: press POWER ( Figure 24 ). The LED will blink.
Power off: press POWER and select YES . The LED will stay off.
4.2 Controller overview
4.2.1 Keypad description
The keypad and description is detailed in Figure 24 .
Figure 24 SD900 keypad
1 POWER : press to turn controller on or off 7 BACK : cancel or return to previous screen
2 VOLUME CALIBRATION : enter volume calibration menu 8 ARROW KEYS : moves cursor or scrolls through values
3 STOP : stops the pump or distributor if running 9 STATUS : displays current status of the sample program
4 LED : blinks when controller is powered on 10 RUN/HALT PROGRAM : starts or stops a sample program
5 MENU : displays the main menu 11 MANUAL OPERATION : manual operation of pump or
distributor
6 ENTER : selects the highlighted or entered value