YOKOGAWA Vigilant Plant EXA TB Series, User Manual

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<1. OVERVIEW>
1-2
IM 12E04A02-02E
1.1 System Con fi guration
The TB400G scattered-light turbidimeter comprises a detector, converter and sampling system
(which supplies process sample water, zero-calibration water (“zero water”), and cleaning
water). This instrument is classi fi ed into three types depending on the speci fi cations for the
sampling system. However, if speci fi ed in advance, the detector and converter may be delivered
separately.
Here, four types of the instrument, including the delivery of detector and converter separately,
will be described. Details on the detector and converter are described in Section 1.2, “Operating
Principle”.
1.1.1 TB400G- □ - □ -NN (without sampling system)
The detector and converter are available separately and can be assembled into any sampling
system.
The
fl owrate condition for sample is 1.5 to 2 l/min. If the fl owrate exceeds this range, satisfy the
fl owrate condition by providing a head tank (constant-level chamber) or the like.
For measurements of low turbidity (less than 200 mg/l), prepare a sampling system which can
supply the zero-calibration water (tap water fi ltered with a zero-turbidity fi lter).
1.1.2 TB400G- □ - □ -A1 (with sampling system, without
automatic cleaning or automatic zero calibration)
This is a system which combines the detector and converter with a sampling system to manually
supply process sample, zero-calibration water, and cleaning water (see subsection 2.6.1).
The measuring water
fl ows into a header tank (constant-level chamber), serving also as a bubble
separation tank, after passing the ball valve located after the tap water inlet port.
Debubbled sample in this tank
fl ow into the measuring cell in the detector at a constant fl owrate,
and drains through the drain outlet after over fl owing at the measuring cell.
The cleaning water passes the ball valve located after the tap water inlet port and fl ows into
the measuring cell in the detector from the cell side. The cleaning water then starts swirling
and removes dirt on the measuring cell wall. The dirt, together with the opening the ball valve
mounted under the header tank.
During zero check, the zero-calibration water is
fi ltered by passing through a zeroturbidity fi lter
from the tap water inlet. This zero-calibration water fl ows into the measuring cell in the detector
via the head tank through a tube separate from that for the sample and drains through the drain
outlet.
1.1.3 TB400G- □ - □ -A2 (with automatic cleaning and without
automatic zero calibration)
This is a system which comprises the TB400G-
□
-
□
-A1 model with the automatic cleaning
function added (see subsection 2.6.2).
The sampling system of this system incorporates a solenoid valve at the cleaning water tube and
an electric motor-operated valve under the header tank. These provisions automatically clean the
measuring cell under the detector in a sequence preset in the converter.
3rd Edition : May. 31, 2010-00