Toshiba LF502 - Manual (Page 7)

TIC-LF502A
7
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Piping Precautions
(1) Flange connection
The flowmeter has upstream and downstream
flanges on the ends of detector pipe. Connect
these flanges with the flanges on both sides of
pipeline bore using connection bolts after
inserting a gasket between them. See Figure 7.
Tighten the bolts in even increments diagonally
across.
Figure 7. Flange Connection
(2) Required straight pipe length
The straight pipe length is required to prevent
uneven flow velocity and a disturbance on the
fluid surface in the detector pipe. The required
straight pipe length should be as follows:
• Downstream side:L = 5D minimum
• Upstream side:L = 10D minimum
where,
L = straight pipe length (straight pipeline length
+ half length of detector pipe length)
Note: The length of reducers, if used, can be counted as
a part of straight pipe length.
Figure 8. Required Straight Pipe Length on
Upstream and Downstream Sides
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About establishment environment
Do not store or install the flowmeter:
• Where there is direct sunlight.
• Where excessive vibration or mechanical shock
occurs.
• Where high temperature or high humidity
conditions exist.
• Where corrosive atmospheres exist.
• Places that can be submerged under water.
• Where there is sloped floor. To put the flowmeter
temporarily on the floor, place it carefully with
something, such as stopper, to support it so that the
flowmeter will not topple over.
In areas like the following, there may be the case that
infrared switches do not function correctly. (If these
are unavoidable, use an appropriate cover.)
(1) Where unit (operation panel) is exposed to direct
sunlight, reflection of light onto window pane and
diffused light reflection.
(2) Where smoke and steam may occur.
(3) Where exposed to direct snow, ice or mud.
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Ordering Information
1. When ordering the LF502 flowmeter, refer to
Table 1 (Type Specification Codes). An entry
must be made for each of the columns in each of
these tables.
2. Fluid characteristics:
(1) Type of fluid to be measured and its
characteristics
(2) Fluid temperature
(3) Fluid pressure
(4) Electrical conductivity of the fluid
3. Measuring range
4. Digital I/O specifications
5. Ordering scope:
Actual flow calibration data:(Required or not)
6. Other items
Specifications other than standard items
Observation
window
Observation
window
Upstream flange
Downstream flange
Flow
directio
Gasket
Bolt
Flow regulation
valve etc.
Observation window
Detector
10D minimum 5D minimum