TM8400B-L-00
1 November 2004
Step 2. Close S1. Turn unit function switch to zero and adjust R238 for a zero
display.
Step 3. (a) To adjust gain of amplifier, set Temp switch to 33°C. Set
suppression switch to 22, function switch to Read, and Standardize
Dial to 5.000. Dial the resistance box for a reading on the display
of exactly 2.2 - 0250. It may be necessary to adjust the Standardize
Dial slightly. Approximate values of the decade box setting
required are given in Table 11.3. Turn suppression switch to step
21 and note reading on display. Adjust R237 for a reading of
2.1 + 9750. (A change of 10 000 ±1 digit).*
(b) Turn suppression switch to 0.1, reset decade box until the display
reads 0.1 - 0250 and check again. 0.0 setting for 0.0 + 9750.
*If the gain is too far out of adjustment, it may be necessary to
adjust the resistance box until the display reads more negative than
2.2 - 0250.
Step 4. Set suppression switch at 22. Replace cell with decade box. Set box to
get a display of 2.2 - 00XX record. Decrease suppression switch setting to
21 and record reading. The change in reading should be 10,000 digits.
Repeat for all suppression steps. The approximate simulation resistances
are shown in Table 11.3. This checks the linearity of the suppression
switch steps.
Step 5. Replace decade box with cell. Connect sample bottle of tap water and
check for leaks in plumbing, proper flushing and filling of conductivity
cell and rate of flow (30 sec. max. per cycle). (30 ml/min.)
Step 6. Turn temp. set switch to 18°C. Fill bath with water approximately 18°C
and check for possible leaks or plumbing malfunction. Slow filling is
essential to prevent leaking at seals when overflow condition is reached.
Step 7. Allow the bath temp to stabilize and check temperature with 9540
Thermometer probe inserted through hole in tank top. Repeat this for
TEMPERATURE SENSOR switch setting of 1, 2 and Normal. Allowable
tolerance is ±20 mK.
Step 8. Repeat Steps 6 for temperature 21°, 24°, 27°, 30° and 33°.
Step 9. Using standard seawater (Wormley Water or equivalent) check
STANDARDIZE control with bath temp. at 18°C, 27°C, and 33°C.
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