4.
Change the decade box resistance and verify that the correct current is shown.
Calculate the current from the equation:
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.
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.
Simulate chlorine and ozone
Figure 8-12:
2.
Set the decade box to the resistance shown in the table.
Sensor
Polarizing voltage
Resistance
Expected current
499ACL-01 (free
chlorine)
200 mV
28 M
Ω
500 nA
499ACL-02 (total
chlorine)
250 mV
675 k
Ω
2000 nA
499AOZ
200 mV
2.7 M
Ω
500 nA
3.
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
Instruction Manual
113
Summary of Contents for Rosemount5081
Page 4: ......
Page 10: ...Contents vi Rosemount 5081 ...
Page 12: ...Startup procedure 2 Rosemount 5081 ...
Page 23: ...Mounting 5081 on a pipe Figure 3 2 Installation Instruction Manual 13 ...
Page 24: ...Installation 14 Rosemount 5081 ...
Page 28: ...Wiring 18 Rosemount 5081 ...
Page 50: ...Programming basics 40 Rosemount 5081 ...
Page 130: ...Diagnostics and troubleshooting 120 Rosemount 5081 ...
Page 136: ...Digital communications 126 Rosemount 5081 ...
Page 140: ...Engineering drawings 130 Rosemount 5081 ...
Page 141: ...Engineering drawings Instruction Manual 131 ...
Page 142: ...Engineering drawings 132 Rosemount 5081 ...
Page 143: ...Engineering drawings Instruction Manual 133 ...
Page 144: ...Engineering drawings 134 Rosemount 5081 ...
Page 145: ...Engineering drawings Instruction Manual 135 ...
Page 146: ...Engineering drawings 136 Rosemount 5081 ...
Page 151: ...EU Declarations of Conformity 138 Rosemount 5081 ...