PART THREE - OPERATION
SECTION 6 - TEST/MAINTENANCE
Accu4™ Low-range Turbidimeter System
Rev. 2-300
62
screen confirms that the analyzer is operating properly.
If “FAIL” appears, it may mean:
•
EPROM failure (data is not valid).
•
Scaling card not present or not recognized.
•
Analog-to-digital converter not responding.
•
RAM failure.
•
Internal serial communications failure.
4.
Press
ENTER key
once to view the “STATUS:
SENSOR” screen. Sensor status indications can be:
•
CHAMBER OK -- Sensor is operating properly.
•
CHAMBER DIRTY -- Sensor flow chamber needs
cleaning. Refer to Part Four, Section 1.1 for details.
•
CHAMBER UNKNOWN -- Sensor may be:
✓
Disconnected or incorrectly wired to analyzer.
✓
Providing a very noisy measurement signal.
✓
Inoperative due to disconnected or incorrectly
wired light source or detector.
✓
Inoperative due to bad signal processing module.
5.
With the “STATUS: SENSOR” screen displayed, press
ENTER key
once to view the “STATUS: SOURCE 1”
screen. Press
ENTER key
again to view the “STATUS:
SOURCE 2” screen. Source status indications can be:
•
OK -- LED light source is operating properly.
•
FAIL -- LED light source may be disconnected, in-
correctly wired, or inoperative. See Part Four,
Section 1.3 for replacement details.
6.
With the “STATUS: SOURCE 2” screen displayed,
press
ENTER key
once to view “STATUS: DETECT 1”
screen. Press
ENTER key
again to view the “STATUS:
DETECT 2” screen. Detector status indications can be:
•
OK -- Detector is operating properly.
•
FAIL -- Detector may be disconnected, incorrectly
wired, or inoperative. See Part Four, Section 1.3 for
replacement details.
7.
With the “STATUS: DETECT 2” screen displayed, press
ENTER key
once to view the “STATUS: RLY A” screen.
Subsequent
ENTER key
presses display status screens
for Relay B, C, and D. Relay status indications can be:
