TM8400B-L-00
1 November 2004
STEP 6. Open front panel. (Section 10.4).
STEP 7. Depress and hold meter test switch S301 mounted on inside front panel behind
display. The display should read 0.0 2000 ±2 digits. Release S301.
STEP 8. If the display is not within ±2 digits of 0.0 2000 with S301 depressed, refer to
11.4.3. Step 3.
10.7. HEATER LAMP REPLACEMENT
STEP 1. Switch power off instrument and remove line cord. Withdraw chassis and open
front panel as per Section 10.4.
STEP 2. Disconnect lamp socket wires from sliders.
STEP 3. Unscrew pigtail clamp ring and carefully pull out lamp socket.
STEP 4. Unscrew old bulb from socket.
STEP 5. Smear small amount of marine grease inside the lamp socket and O-ring gasket.
STEP 6. Slide O-ring gasket on to base of bulb. Screw bulb into socket.
STEP 7. Carefully re-insert lamp in its hole, tighten the retaining screws and reconnect
lamp socket sliders.
10.8. CONDUCTIVITY CELL REMOVAL
Perform the following steps to remove the conductivity cell for cleaning, inspection or
replacement. The conductivity cell should be replaced every 5 to 7 years to ensure stable
readings. Cleaning the cell is required when an erratic digital display persists when all controls
are set for normal operation, especially during standardization. The cause is usually from a
contaminating film such as oil, algae etc. Proceed as follows:
STEP 1. Withdraw chassis from cabinet (Section 10.4).
STEP 2. As seen from front of instrument, disconnect drain tube on right hand side of the
cell from reducer coupling.
STEP 3. Remove four small screws securing cell assembly to tank cover.
STEP 4. Lift cell right hand end first so drain tube clears openings in top panel.
STEP 5. Remove cell drain tube from plastic coupling. Do not remove coupling.
STEP 6. Remove cell fill tube from its coupling inside the tank.
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