LABEC M-TIT-5 - Manual (Page 48)

VI. THE COMPLETE SETS OF THE METER
1. Model T I T-5 Automatic Potentiometer 1 set
2. Model TIT-5 Automatic Potentiometer volume titration and measuring unit 1
3. Model T-818-B-6 Temperature Sensor 1
4. Model E-201-C-9 pH Combination Electrode 1
5. Accessories, see Packing List 1
VII.APPENDIX
1. pH standard buffer solution A (pH 4.00, 25℃)
Weigh 10.12g of KHC
8
H
4
O
4
that has been dried under 110℃~130℃ for 2~3 hours, dissolve it in
1L of de-ion water.
2. pH standard buffer solution B (pH 6.86, 25℃)
Weigh 3.388g of KH
2
PO
4
and 3.533g of Na
2
HPO
4
respectively, dissolve it in 1L of de-ion water.
3. pH standard buffer solution C (pH 9.18, 25℃)
Weigh 3.80g of Na
2
B
4
O
7
, H
2
O which was put in the desiccator with saturated NaBr for two days,
dissolve it in 1L of de-ion water.
Table 1
Symptom Trouble cause Settlement
No display
a. power is off
b. fuse is damaged
c. bad connection between
control unit and volume
titration unit
a. check the power
b. change the fuse of same
type
c. check the connection
between control unit and
volume titration unit
Connecting failed when switch
on the meter a. connection between each
unit is incorrect.
b. reduction of the meter is
sometimes no good
a. check the connecting line
according to 1.2 in chapter
IV Operation of the Meter
b. switch off and switch on
again after 30 seconds
mV/pH measurement is not
right a. something wrong with
electrode performance
b. something wrong with
another electrode interface
short circuit
a. change an electrode
b. change Q9 short circuit
plug
Printer doesn't work or work
incorrectly a. power of printer is not
connected
b. print line is not connected
c. printer is set by mistake
d. printer is selected by
mistake
a. connect printer power
b. connect print line
c. set correct printer type
according to 10.3
d. change the printer
Pre-titration can not find the
end point a. end point jump is too small
b. titrant or sample are not
right
c. end point value is too small
d. electrode is selected by
mistake
a. set jump to "small"
according to 7.1.5
b. change titrant or correct the
sample
c. use "blank titration" mode
d. select electrode correctly
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