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Section 8.0 Maintenance
8.1 Overview
The 56 Analyzer used in the Clarity II turbidimeter needs little routine maintenance. Clean the
analyzer case and front panel by wiping it with a clean soft cloth dampened with water ONLY. Do
not use solvents, like alcohol, that might cause a buildup of static charge.
A few of the components of the analyzer are replaceable. See Tables 8-1 and 8-2.
8.2 Sensor
8.2.1 Cleaning the sensor
Clean the sensor by rinsing it with water followed by wiping with a soft tissue. If water is inade-
quate, wash with a mild detergent solution followed by thorough rinsing with water. Do not
scratch the lamp or photodiode windows.
If mineral scale is present, use a dilute acid solution applied with a cotton swab to clean away
the deposit. Rinse thoroughly with water.
Do not use abrasive cleaners or solvents.
8.2.2 Replacing the lamp/LED board
The USEPA-compliant sensor uses a tungsten filament lamp (PN 1-0901-0004-EPA) as the light
source. The lamp has an expected life of about one year. The ISO-compliant version uses an
infrared LED (PN 1-0901-0005-ISO). Its expected life is five years. The 56 analyzer continuously
monitors the source intensity and corrects for changes in source intensity caused by age. When
the source intensity becomes too low, the analyzer warns the user. The user should replace the
lamp as soon as possible.
To replace the lamp/LED board:
1. Turn off power to the analyzer.
2. Remove the sensor from the measuring chamber and disconnect the cable.
Instruction Manual Clarity II T56
PN-51-T56 May 2012
Maintenance 27
Explosion Hazard. Do not disconnect equipment when a flammable or combustible
atmosphere is present.
WARNING
Explosion Hazard. Do not disconnect equipment when a flammable or combustible
atmosphere is present.
WARNING
Before removing the sensor, be absolutely certain that the process pressure
is reduced to 0 psig and the process temperature is lowered to a safe level!
WARNING