YOKOGAWA RC400G, Руководство пользователя

Страница: 63 / 141

<5. Converter Operation>
5-10
IM 12F4A1-01E
However, if the limit of “output range-1” and “output range-2”, whichever is greater, is set at 5.00
mg/l (ppm) or lower, the maximum displayed value is approx. 35 µA because the current input
range is set to “Low” (approx. -5 to 35 µA).
When the diffusion current exceeds a value corresponding to 5.00 mg/l, “O.L” is displayed.
For the current input range, see subsection 6.1.1.
(5) Display for “%FS” of Output Signal (Function code “5”)
Function code “5” displays what percentage of the selected output range span the current
residual chlorine concentration measured value corresponds to. The display range is -10.0 to
110.0 %.
(Example) For output range: 0 to 3 mg/l, Current residual chlorine concentration measured
value: 0.54 mg/l;
Display for “%FS” of output = 0.54 / (3-0) x 100 = 18.0 (%)
The analog output is sent out in the range of -10.0 to 110.0 %.
(6) Display for Sample Water Metering Pump Flow (Function code “6”)
Function code “6” displays the sample water metering pump delivery flow rate. This flow rate
displayed value is that computed from the result of operation conducted using function code “7”
in <MAINT.> mode (see subsection 4.3.5).
Hence, if operation is not conducted even once, “0.00 ml/min” is displayed.
(7) Display for Reagent Metering Pump Flow (Function code “7”)
Function code “7” displays the reagent metering pump delivery flow rate. This flow rate displayed
value is that computed from the result of operation conducted using function code “8” in
<MAINT.> mode (see subsection 4.3.6).
Hence, if operation is not conducted even once, “0.00 ml/min” is displayed.
(8) Zero Point Error Display (Function code “8”)
Function code "8" displays the diffusion current (µA) obtained in the latest zero calibration. Since
the zero point reference diffusion current is 0 µA, this value shows the zero point error.
If the diffusion current in zero calibration exceeds the range of -1.0 to 1.0 µA, an error message of
"Err21" is issued.
(9) Slope Display (Function code “9”)
Function code "9" displays the sensitivity in % obtained in the latest span calibration to the
reference sensitivity.
If the sensitivity decreases below 50 % of the reference sensitivity in span calibration, an error
message of "Err22" is issued.
NOTE
The reference sensitivity which has been set on shipment is the value "2.62 µA/(mg/l) at 20 °C"
based on the amperometric titration.
5.3.3 Key Operation in <MAINT.> Mode
This subsection describes key operations to be conducted by specifying function codes in
<MAINT.> mode and displays associated with the key operations.
(1) Zero calibration (Function code “1”)
14th Edition : Jul. 15, 2020