9
Flow measurements use flowing vat 6.
Fig.1.1b shows the oxygen sensor design.
The sensor’s basic functional elements are platinum cathode 7 and silver
anode 8. Secured to cathode 7 with caprone thread 9 is teflon film 10. The mem-
brane and rubber bushing form membrane assembly 11 fitted over bushing 12 and
filled with electrolyte 13. The temperature sensor is enclosed in case 14. Protective
bushing 15 covers the sensor electrode portion and is screwed into cable bushing
16 (Fig.1.1
а
).
Cable 17 connects the sensor electrode assembly to the converter unit.
Made of a corrosion resistant alloy, flowing vat 6 is a threaded cylinder with
supply and drain connections for controlled water. To install the oxygen sensor in
the flowing vat, replace protection bushing 15 with flowing vat 6.
1.5.4 Functions of buttons on the converter unit front panel
The analyzer front panel features the following buttons as shown in Fig.1.1
а
:
the
button for analyzer power on/off. When the analyzer is energized,
the display shows the measured DOC or temperature value;
the
MODE
button enables the DOC or temperature measuring mode, with
the display showing the measured DOC or temperature value and
mg/dm
3
or
°С
character, respectively, coming on in the
right half of the indicator;
the
CAL
button selects
the analyzer calibration mode. When pressed se-
quentially, the button causes the characters
с0
(analyzer reset) and
с1
(atmos-
pheric air calibration) to light up on the display;
the
ENTER
button confirms the selected calibration mode and completes
calibration.
1.6 Measuring instruments, tools and accessories
1.6.1 The following tools and accessories, which are not included in the de-
livery set, will be additionally required for maintenance of the analyzer:
2 mm cross screwdriver;
В-1-250 beaker;
КН-100-19/26 flask;
hydroquinone, chemically pure;
sodium or potassium hydroxide, chemically pure.