Dwyer Instruments P2 Series Manual

Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded.
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer products. Take care in the
proper selection of materials of construction, particularly wetted
materials.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Dwyer Products have been designed to resist shock and
vibration; however, shock and vibration should be minimized.
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Dwyer Products must not be field-repaired.
Physical damage sustained by the product may render it
unserviceable.
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
These pressures and
Phone: 219/879-8000
Fax: 219/872-9057
Lit-By Fax: 888/891-4963
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
P2 Model Flow Switches operate reliably in any mounted attitude for which they
are calibrated. Other attitudes will slightly alter actuation settings. Unless
otherwise specified, units are calibrated in the vertical inlet port down position.
Installation . . .
The P2 is a plastic, taper-threaded instrument.
Over-tightening will result in port breakage!
All plastic NPT threads should be installed using a suitable thread sealant.
(Teflon tape or Permatex "No More Leaks"). Sealant must be kept out of unit
during installation. Improper installation to a process can result in cracking.
Install fittings or adapters onto flow switch using strap wrenches. One to two
turns past hand-tight is adequate.
Dimensional Data . . .
Piston
Retaining
Assembly
Wire
1"
.78" dia.
(25.4 mm)
(19.7 mm)
Inlet
In-Line Flow Switches
P2 Series
- Warning -
Switch
Assembly End Plug
Air (Gas) Flow Units
Only
Spring
Outlet
4.10"
(104.3 mm)
Mechanical
- #22 AWG PVC Lead Wire
Port Thread
(1/4" NPT)
Typ. 1/4" NPT
- Conductor PVC Cable
or R 1/4"
(R 1/4")