YOKOGAWA vigilantplant DM8, Руководство пользователя

Страница: 54 / 63

<5. MAINTENANCE>
5-1
IM 12T03A01-02E
5. MAINTENANCE
5.1 Daily Inspection/Maintenance
5.1.1 Cleaning the Vibrator in the Detector
Dirt particles may be deposited on the inner wall of the vibrator pipe, depending upon the nature
of the process liquid. This can cause an error. Clean the pipe at regular intervals in the following
manner.
(1) Close valves BV1 and NV4 and open NV2 and NV3.
(2) Connect the air pipe to the outlet of the needle valve NV2. Purge the sample liquid in the
vibrator from the drain port of the needle valve NV3 by blowing 0.05 MPa G air.
(3) Remove the blind plugs from the pouring port of the standard solution (two places) and pour
cleaning liquid about 200 mL into the vibrator.
(4) After a while, fix blind plugs again on the pouring ports and purge the cleaning liquid in the
vibrator as described in (2). Wash the inside of the vibrator pipe with a brush (accessory) as
shown in Figure 5.1.
STEAM IN
CONDENSATE OUT
V2
a
a
V1
b
ST1
a'
a'
b'
TI
F
FM
NV1
PI
NV2
DD
NV3
NV4 BV1
Element specifications
F: Strainer body; 316 SS
Element; 316 SS, or Ni (option)
PI: Pressure gauge, 0 to 1MPa or 0 to 2MPa, 316 SS
TI: Thermometer. 0 to 100 °C or 0 to 150 °C, 316 SS
FM: Flowmeter, tapered metal tube flowmeter, 1 to 10 L/min, 316 SS
BV1: Ball valve, 316 SS
NV1 to 4: Needle valve, 316 SS
DD: Density detector
V1, V2: Valve
ST1: Steam trap
SAMPLE IN
SAMPLE OUT
Figure 5.1 Cleaning the Figure 5.2 Flow Diagram
Vibrator
(5) Remove the blind plugs again from the pouring ports of the standard solution and pour the
cleaning liquid about 200 mL. After a while, fix the blind plugs and purge the sample liquid
by blowing 0.05 MPa G air. After the liquid is blown out, increase the air pressure up to 0.2 to
0.3 MPa G blowing air for 2 or 3 minutes to dry the inside of the vibrator.
5.1.2 Exchange of Desiccant in the Detector
Desiccant is used to protect the oscillation amplifier in the detector from humidity.
Checks the detector terminal box one or two times a year and replace the desiccant if humidity is
detected. Two desiccants are provided as accessories. For the explosion-proof detector, confirm
that there are no explosive gases using a gas detector before removing the terminal box cover.
5th Edition : Dec. 11, 2015-00