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SECTION 3 - INSTALLATION/OPERATION
3-1. Unpacking
The 199 DPU should be inspected at time of unpacking to detect any damage
that may have occurred during shipment.
NOTICE:
The instrument was checked for accuracy at the factory — do not
change any of the settings during examination or accuracy will be affected.
NOTICE:
For application in critical media, requiring special cleaning pro-
cesses and precautions, a polyethylene bag is used to protect the instrument
from contamination. This protective bag should be removed only under
conditions of controlled extreme cleanliness.
NOTICE:
Do not locate the instrument near vents or bleed holes that dis-
charge corrosive vapors or gases.
3-2. Mounting
A. Flush or Panel Mounting
Attach the case of the instrument (recorder, indicator etc.) to the panel.
Refer to the Installation and Operation Manual for the specific instrument
for the mounting details.
B. Pipe Mounting
Refer to the Outline Dimension Drawing in Section 6 for the pipe mount-
ing diagram. The DPU must be mounted approximately level to operate
properly.
3-3. Piping — Standard Practices
A. All Applications (flow and liquid level)
1 . Shorten the distance between the primary device and the DPU as
much as possible. Distances exceeding 100 feet are not recommended.
For distances up to 50 feet, use 1/4-inch or 3/8-inch pipe or tubing.
For runs of 50 to 100 feet, use 1/2-inch pipe or tubing. The recom-
mended limitation does not apply if an air purge or blow-back system is
used.
2. Slope all piping at least one inch per linear foot to avoid liquid or gas
entrapment.
3. Provide two feet of uninsulated piping between the DPU and the pri-
mary device for each 100°F (+37.8°C) in excess of +200°F (+93.3°C).
4. Assure that the temperature of the DPU never exceeds 180°F
(+82°C). When steam tracing is necessary, the steam pressure should
not exceed five pounds per square inch and insulation should not be
used. If pressure must exceed five pounds per square inch, limit the
length of tubing around the DPU to two turns and do not insulate.
5. Install a suitable pulsation dampening device upstream of the DPU.
Where severe pulsation is present, the accuracy of the flow measure-
ment will be affected.
6. Mount the DPU on a solid support to minimize vibration. Tighten all
points, using a suitable compound; leaks in piping can cause measure-
ment errors.
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