MODEL TCL

SECTION 11

 

TROUBLESHOOTING

11.5.6 Readings are too high

1.Is the sample conditioning reagent clear and colorless? If the reagent is pale yellow, results will be high. The pale yellow color is caused by iodine, which comes from the reaction between atmospheric oxygen and potas- sium iodide. The reaction is catalyzed by sunlight. The purpose of the blue carboy is to protect the reagent from sunlight.

2.Is the sensor fill solution fresh? An old, discolored fill solution may produce a high reading.

11.5.7 Temperature measured by standard thermometer was more than 3°C different from analyzer.

1.Is the standard thermometer, RTD, or thermistor accurate? General purpose liquid-in-glass thermometers, par- ticularly ones that have been mistreated, can have surprisingly large errors.

2.Is the temperature element in the sensor completely submerged in the liquid?

3.Is the standard temperature sensor submerged to the correct level?

11.5.8 Current Output Too Low.

Load resistance is too high. Maximum load is 550 Ω.

11.5.9 Alarm Relays Do Not Work

1.Verify the relays are properly wired.

2.Verify that deadband is correctly set. See Section 7.4.

11.6 SIMULATING INPUTS

To check the performance of the analyzer, use a decade box and 1.5V battery to simulate the current from the sensor. The battery, which opposes the polarizing voltage, is necessary to ensure that the sensor current has the correct sign.

1.Disconnect the anode and cathode leads from terminals 8 and 10 on TB1 and connect a decade box and 1.5V battery as shown in Figure 11-2. It is not necessary to disconnect the RTD leads.

2.Set the decade box to 1.4 MΩ.

3.Note the sensor current. It should be about 960 nA. The actual value depends on the voltage of the battery. To view the sensor current, go to the main display and press DIAG. Choose sensor 1. The input current is the second line in the display. Change the decade box resistance and verify that the correct current is shown. Calculate current from the equation:

current (nA) = Vbattery — 250 (voltages in mV) resistance (MΩ)

The voltage of a fresh 1.5 volt battery is about 1.6 volt (1600 mV).

 

7

ANOD SHLD

 

8

ANOD

R

9

CATH SHLD

 

10

CATH

FIGURE 11-2. Simulating Chlorine

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Emerson TCL instruction manual Simulating Inputs, Anod, Cath
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TCL specifications

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