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DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting

DOTX-45 63 -

the nominal output of the sensor will be about

+400mVDC when measured in air at 25C (100%

saturation) from BLACK (-) to RED (+) on the analyzer

terminal strips. This value is affected by temperature,

pressure, and age of the sensor so it’s possible to see a

typical value that ranges from perhaps +200mVDC to

about +800 mVDC under a wide range of conditions in

air.

A. Disconnect the five sensor wires from the oxygen

monitor. Those wires are color coded red, white, blue,

green, brown, and black. Note that the brown wire may

be replaced with a yellow wire in some cables.

B. Remove the front sensor “cartridge” for the sensor body

by unscrewing the cartridge at the large “knurl” in a

counter clockwise manner. Inspect the gold RCA jack for

signs of moisture or other foulants. Clean and thoroughly

dry both connectors if necessary. Re-assemble when

complete.

E. Connect the DVM between the brown and black wires.

These are the RTD leads, and you should find a

resistance value that depends on the temperature. The

table below lists the resistance values for various

temperatures. Reading resistance between the red and

green wires should give exactly the same values as

between red and black.

Temperature

°C

Resistance

Ω

0 1000

5 1019

10 1039

15 1058

20 1078

25 1097

30 1117

35 1136

40 1155

45 1175

50 1194

Figure 10-2 Pt1000 RTD Table

1 2 ... 59 60 61 62 63 64 65 66 67 68 69

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