Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 85)

83
Maintenance
5. With the sampler controller off and the door closed, wait
approximately 30 minutes for the reference sensor and lab
thermometer to stabilize with the ice bath temperature.
6. After waiting 30 minutes, mix (swirl) the ice bath.
7. Press the POWER button.
8. From the Main Menu, select SYSTEM SETUP>THERMAL
SETUP>CALIBRATION .
9. The screen displays the current temperature read by the
controller. In degrees C, enter the reading indicated on the
thermometer in the Ice bath, to the nearest one tenth degree,
next to the
ACTUAL temperature display and press ENTER . This
completes the calibration procedure.
10. Reinstall the RTS.
6.7 Resetting the circuit breaker (AWRS only)
DANGER
Electrocution hazard. Disconnect AC power from sampler
before attempting to reset the internal circuit breaker.
DANGER
Fire Hazard. Continual tripping of the circuit breaker is an
indication of a potentially serious problem with the sampler
Service is required.
The sampler refrigerator has an internal circuit breaker in the Power
Junction Assembly Control Box located in the upper rear
compartment (
Figure 39 on page 84 ). If the circuit breaker is
tripped, it must be reset.
Prerequisites:
• Phillips head screwdriver
Important Note: The power junction assembly thermal control box
contains electro-static sensitive components. Avoid contact with all
printed circuit board components.
Procedure:
1. Disconnect AC power from the unit.
2. Remove the 2 screws from the rear lid.
3. Rotate the lid up and out of the way.
4. Examine the circuit breaker through the clear window of the
thermal control box.
5. If the circuit breaker is not in the OFF position, call service.
6. If the circuit breaker is in the OFF position, do the following:
a. Remove the clear cover.
b. Flip the switch to the ON position.
c. Replace and secure the clear cover.
d. Attach the rear lid.
7. Connect AC power to the unit.