YOKOGAWA Vigilant Plant EXA TB Series, Руководство пользователя

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<4. OPERATION>
4-4
IM 12E04A02-02E
4.1.9 Supplying Sample and Adjusting Flowrate
1. Press the converter [mode] key to got the <MEAS.> mode.
2. Place the hand-operated valve in a measuring status (see Section 4.2, Table 4.1).
Note 1: Valves SV1 to SV4 are automatically brought to the measuring status when the
<MEAS.> mode is selected.
3. Supply the speci fi ed fl ow (2 to 10 l/min) of sample.
Note 2: For the model with the speci fi cations for no sampling system and no automatic
cleaning or zero calibration (Suf fi x code: -NN), set the fl owrate of the Sample at 1.5 to
2 l/min.
4.2 Operation
This section describes measurement in the <MEAS.> mode, the on/off operation of each valve in
automatic cleaning and automatic zero calibration, and the settings related to operation.
4.2.1 Starting Measurement
When the [MODE] key in the converter is pressed to move to the <MEAS.> mode, the internal
timer starts and analog output hold (set when shipped form the factory) is reset according to the
predetermined speci fi cations.
The maintenance contact outputs (M1 and M2) also open (set when shipped from the factory)
and the mode information is output only once to the digital output (see the contact output
operation in Subsection 3.3.5 and digital communication speci fi cations in Section 2.1).
Table 4.1 shows valve status in the <MEAS.> mode. Valves SV1 to SV4 automatically operate
according to the predetermined speci fi cations. The statuses shows in Table 4.1 are those when
no automatic cleaning or automatic zero calibration operates.
Table 4.1 Value Statuses When Measurement Is Carried Out
Suf fi x codes V1 V2 V3 V4 V5 SV1 SV2 SV3 SV4
-A1 Open Closed Closed Closed Closed — — — —
-A2 Open Open Closed Open — Closed Closed — —
-A3 Open Open Open Open — Closed Closed Open Closed
4.2.2 Automatic Cleaning Operation
When automatic cleaning is speci fi ed (Suf fi x code: -A2 or -A3), the detector is automatically
cleaned in the <MEAS.> mode. With measuring water (or zero water) fl owing, dirty substances
on the measuring cell wall and the measuring surface edge are washed out by jets of cleaning
water (tap water) from two outlets on the side of the measuring cell in the detector. After cleaning,
dirt on the measuring cell, header tank, and in the piping between the header tank and the
detector is washed out by opening the drain outlet of the header tank.
The above cleaning operation is repeated a predetermined number of times.
The information of start or end is output when automatic cleaning is started or ended.
In addition, there are two types depending on the speci
fi cations for automatic cleaning.
• Without automatic zero calibration (Suf fi x code: -A2)
• With automatic zero calibration (Suf fi x code: -A3)
The explanation for each types are followed.
3rd Edition : May. 31, 2010-00