YOKOGAWA RC400G, User Manual

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<4. Operation>
4-7
IM 12F4A1-01E
4.3.5 Confirming Sample Water Metering Pump Delivery Flow
The sample water metering pump has been adjusted to deliver the required flow. Verify to ensure
the flow using the following procedure:
Prepare a 200 ml graduated cylinder to be used for verifying.
(1) Confirm that the analyzer is in <MAINT.> mode and then display “7” in the function code
display using the [FUNC] key. The content of this code is “measurement of sample water
metering pump flow”. The data display indicates “FLo_1”.
(2) Drain the sample water out of the drain cock at the bottom of the measuring tank and
measure the delivery flow rate by cylinder to a definite volume (150 ml).
• Loosen the drain cock. Drain out the water stored in the measuring tank and then introduce
the sample water flowing out of the drain cock into the graduated cylinder.
• Press [ENT] key the instant the sample water reaches the reference graduation of the
graduated cylinder. At this moment, the data display indication changes to "sec" count.
• Press [ENT] key again the instant the sample water in the cylinder increases by 150 ml from
the reference graduation.
After the above operation is performed, the converter computes taking the number of
seconds counted as the time per pump delivery of 150 ml and indicates flow rate in the data
display. If the flow rate is 50 ±5 ml/min, the sample water metering pump delivery flow is
normal.
If incorrect, make adjustment by changing the stopper position in the pump driving assembly
(see section 8.8).
(3) Close the drain cock. next confirm the reagent metering pump delivery flow.
4.3.6 Confirming Reagent Metering Pump Delivery Flow
The reagent metering pump has been adjusted to deliver the required flow. Verify to ensure the
flow in a similar manner to that of sample water:
Prepare a 50 ml burette and an approx. 120 cm-long soft PVC tube of O.D. 6 mm and I.D. 4 mm.
To facilitate the work, also prepare a burette stand.
(1) Confirm that the analyzer is in <MAINT.> mode and then display “8” in the function code
display using the [FUNC] key. The content of this code is “measurement of reagent metering
pump flow”. The data display indicates “FLo_2”.
(2) Press [PUMP] key to once stop the metering pump operation.
(3) Close the ball valve (*1) in the reagent flow line. Remove the tubing connected to the
reagent metering pump suction tubing joint.
*1: RC400G-1 For tap water: V3
RC400G-2 For raw water: V6
RC400G-3 For treated water: V8
(4) Connect the prepared soft PVC tube to the burette and fill the tube and burette with water
(alternative of reagent). Connect the opposite end of the PVC tube to the reagent metering
pump suction tube joint and then set the burette as shown in Figure 4.5.
14th Edition : Jul. 15, 2020