Table of Contents
4.
8.4.10
Simulating input currents - chlorine and ozone
To check the performance of the transmitter, use a decade box and a 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.
2.
3.
Instruction Manual
Change the decade box resistance and verify that the correct current is shown.
Calculate the current from the equation:
Disconnect the anode and cathode leads from terminals 13 and 14 and connect a
decade box and battery as shown in
It is not necessary to disconnect the RTD leads.
Figure 8-12:
Simulate chlorine and ozone
Set the decade box to the resistance shown in the table.
Sensor
Polarizing voltage
499ACL-01 (free
200 mV
chlorine)
499ACL-02 (total
250 mV
chlorine)
499AOZ
200 mV
Note the sensor current. It should be close to the value in the table. The actual value
depends on the voltage of the battery. To view the sensor current:
a. Go to the main display and press DIAG.
b. Press NEXT.
SEnSor Cur appears in the display.
Diagnostics and troubleshooting
Figure
8-12.
Resistance
28 MΩ
675 kΩ
2.7 MΩ
Expected current
500 nA
2000 nA
500 nA
113
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Troubleshooting
