Dwyer DS-300 - Manual (Page 2)

LP
HP
1-7/16 (36.53)
SENSOR
FLOW
PIPE
1/16 (1.59)
CLEARANCE
HP LP
LP DRAIN HP DRAIN
0
.20 .40 .60 .80
1.0
INCHES OF WATER
CAPSUHELIC ®
MAX. OPERATING PRESS. 500 PSIG
ZERO SET
D W Y E R I N S T R U M E N T S , I N C . M I C H I G A N C I T Y, I N D I A N A 4 6 3 6 0 U . S . A .
UPPER PIPE
QUADRANT
LOWER PIPE
QUADRANT
For Air or Gas Flow
Install in upper
quadrant of pipe Condensate drains
back to pipe
For Liquid or Steam Flow
Install in lower
quadrant of pipe
Air bleeds
back to pipe
LP BLEED HP BLEED
PIPE
1/16 (1.59)
CLEARANCE
FLOW
SENSOR
1-7/16 (36.53)
LP
HP
HP LP
INCHES OF WATER
CAPSUHELIC ®
ZERO SET
MAX. OPERATING PRESS. 500 PSIG
.60
.80
1.0
.40
.20
0
DWYER INSTRUMENTS, INC MICHIGAN CITY, INDIANA 46360 U.S.A.
Water Flow Air or Gas Flow
INSTALLATION
1. When using an A-160 thred-o-let, weld it to the pipe wall.
If replacing a DS-200 unit, an A-161 bushing (1/4˝ x 3/8˝) will
be needed.
2. Drill through center of the thred-o-let into the pipe with a
drill that is slightly larger than the flow sensor diameter.
3. Install the packing gland using proper pipe sealant. If the
packing gland is disassembled, note that the tapered end of
the ferrule goes into the fitting body.
4. Insert sensor until it bottoms against opposite wall of the
pipe, then withdraw 1/16˝ to allow for thermal expansion.
5. Tighten packing gland nut finger tight. Then tighten
nut with a wrench an additional 1-1/4 turns. Be sure to hold
the sensor body with a second wrench to prevent the
sensor from turning.
INSTRUMENT CONNECTION
Connect the slide pressure tap to the high pressure port of
the Magnehelic
® (air only) or Capsuhelic ® gage or
transmitting instrument and the top connection to the low
pressure port.
See the connection schematics below.
Bleed air from instrument piping on liquid flows. Drain any
condensate from the instrument piping on air and gas flows.
Open valves to instrument to place flow meter into service.
For permanent installations, a 3-valve manifold is
recommended to allow the gage to be zero checked
without interrupting the flow. The Dwyer A-471 Portable
Test Kit includes such a device.
POSITION
Be certain there is sufficient clearance between the
mounting position and other pipes, walls, structures, etc, so
that the sensor can be inserted through the mounting unit
once the mounting unit has been installed onto the pipe.
Flow sensors should be positioned to keep air out of the
instrument connecting lines on liquid flows and condensate
out of the lines on gas flows. The easiest way to assure this
is to install the sensor into the pipe so that air will bleed into,
or condensate will drain back to, the pipe.
REVISEDBulletin F-50 7/8/04 8:04 AM Page 2