GF Signet 4150 Turbidimeter - Manual (Page 20)

20 Signet 4150 Turbidimeter
Ultrasonic Cleaning
• The 3-4150-3, 3-4150-4, 3-4150-5 and 3-4150-6 feature a
special À ow-through cuvette with an ultrasonic piezo attached
to the base. Spring contacts inside the cuvette housing send
a high frequency signal to the piezo transducer. The vibration
helps prevent scaling and other suspended solids in the
process water from adhering to the inside surface of the optical
glass.
• The ultrasonic system is not intended to clean dirty cuvettes,
or to replace manual cleaning entirely, but it will dramatically
increase the time between cleaning.
Flow-through Cuvette with
Ultrasonic Transducer
(4150-0004)
Ultrasonic Contact Springs
Ultrasonic cleaning
feature in 3-4150-3,
3-4150-4, 3-4150-5 and
3-4150-6 only.
• The 4150 will show CLN on the lower display if a problem is detected with the cuvette:
• Incorrect cuvette installed.
• No contact between cuvette piezo and springs.
• CLN is an alarm condition. Any active relay will be set to alarm state (if set up in the OPTIONS menu) and the 4 to 20 mA will be
locked to the ERLV (Error Level) value you set in the 4 to 20 mA output con¿ guration in the OPTIONS menu (pg. 10): OFF, 0 mA,
2 mA or 4 mA. Factory default is OFF.
• After installing a cuvette, the 4150 will show DRY on the lower display for 30 minutes. During this time, the ultrasonic circuit will not
operate to allow the Vapor Purge system to remove all moisture from the ultrasonic transducer.
• The Vapor Purge system will NOT remove large droplets of water, only residual moisture. The DRY message is normal and is not
considered an alarm condition, therefore no alarms will be implemented. If the cuvette is removed during this period no CLN alarm
is posted until the 30-minute DRY period times out.
The external surface of the ultrasonic cuvette must be
completely dry before it is inserted into the sensor. If
there is any visible moisture present on the cuvette or
transducer, there is a great risk of damaging the sensor
electronics and the transducer.