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Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended
Practices, Liabilities and Warranties.
GENERAL
BEFORE INSTALLING, CHECK THE SENSOR MODEL SELECTED FOR
COMPATIBILITY BETWEEN THE PROCESS MEDIA AND THE SENSOR
AND WETTED PARTS.
MISUSE OF THIS PRODUCT MAY CAUSE EXPLOSION AND PERSONAL
INJURY. THESE INSTRUCTIONS MUST BE THOROUGHLY READ AND
UNDERSTOOD BEFORE UNIT IS INSTALLED.
THIS EQUIPMENT IS SUITABLE FOR CLASS I, DIVISION 2,
GROUPS A,B,C,D; CLASS II, DIVISION 2, GROUPS F AND G; CLASS III;
OR NON-HAZARDOUS LOCATIONS ONLY.
The 117 series pressure switch utilizes a bellows or diaphragm sensor to
detect a pressure change. The response, at a pre-determined set point,
actuates or deactuates a SPDT or DPDT snap-acting switch, converting the
pressure signal into an electrical signal. Control set point may be varied by
turning the internal adjustment hex according to procedures outlined below
(see adjustment-Part II.)
PROOF PRESSURE* LIMITS STATED IN THE LITERATURE AND ON
NAMEPLATES MUST NEVER BE EXCEEDED, EVEN BY SURGES IN THE
SYSTEM. OCCASIONAL OPERATION OF UNIT UP TO PROOF PRES-
SURE IS ACCEPTABLE (E.G., START-UP, TESTING). CONTINUOUS OPERATION
SHOULD NOT EXCEED THE DESIGNATED OVER RANGE PRESSURE.
*PROOF PRESSURE
THE MAXIMUM PRESSURE TO WHICH A PRESSURE SENSOR MAY BE OCCA-
SIONALLY SUBJECTED, WHICH CAUSES NO PERMANENT DAMAGE (E.G., START-
UP, TESTING). THE UNIT MAY REQUIRE RE-GAPPING.
WARNING: EXPLOSION HAZARD - THESE PRODUCTS DO NOT HAVE
ANY FIELD REPLACEABLE PARTS. ANY SUBSTITUTION OF COMPO-
NENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION 2.
Part I - Installation
MOUNTING
WARNING: EXPLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT
UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN
TO BE NON-HAZARDOUS.
117 Series
Pressure Switch
Types: H117, H117K
Tools Needed
Adjustable Wrench
Screwdriver
Hammer (for alternate wire knockouts)
U N I T E D E L E C T R I C
C O N T R O L S
Installation and Maintenance
Instructions
INSTALL UNIT WHERE SHOCK, VIBRATION AND TEMPERATURE
FLUCTUATIONS ARE MINIMAL. MOUNT UNIT SO THAT MOISTURE IS
PREVENTED FROM ENTERING THE ENCLOSURE. IF UNIT IS BEING
INSTALLED WHERE HEAVY CONDENSATION IS EXPECTED, VERTICAL
MOUNTING (PRESSURE CONNECTION DOWN) IS REQUIRED. DO NOT MOUNT IN
AMBIENT TEMPERATURES EXCEEDING PUBLISHED LIMITS.
ALWAYS HOLD A WRENCH ON THE PRESSURE HOUSING HEX WHEN
MOUNTING UNIT. DO NOT TIGHTEN BY TURNING ENCLOSURE. THIS
WILL DAMAGE SENSOR AND WEAKEN SOLDERED OR WELDED
JOINTS.
Controls may be mounted and operated in any position. They may be sur-
face mounted via the two mounting ears on either side of the enclosure, or
directly to a rigid pipe by using the pressure connection. Low pressure and
differential pressure units, models 520-535, 540-548, are also available with
an optional surface mounting bracket. Should the control be installed where
condensation is expected, vertical mounting is recommended as a means of
keeping water away from switch terminals.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT. WIRE
UNITS ACCORDING TO NATIONAL AND LOCAL ELECTRICAL CODES.
MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG. THE RECOM-
MENDED TIGHTENING TORQUE FOR FIELD WIRING TERMINALS IS
7 TO 17 IN-LBS.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAMEPLATES
MUST NOT BE EXCEEDED. OVERLOAD ON A SWITCH CAN CAUSE
FAILURE ON THE FIRST CYCLE.
Remove the two screws retaining the cover and cover gasket. A 1/2" NPT
conduit connection is provided on the left hand side of the enclosure. Two
cast-in 7/8" diameter knockouts for electrical conduit are located on the side
and back of enclosure (see dimensional drawings, opposite page). These can
easily be knocked out by placing a blade of a screwdriver in groove and tap-
ping sharply with a hammer. The terminal block terminals are clearly labeled
"Common", "Normally Open" and "Normally Closed". For units supplied with
DPDT, all terminals are labeled and the following color code applies.
SPDT
Common
Violet
Normally Closed Black
Normally Open
Blue
Grounding screw and clamp (cast in symbol) are provided. Keep the wire as
short as possible to prevent interference with the plunger.
IMP117-07
www.ueonline.com
DPDT
SWT1
SWT2
Violet
Yellow
Black
Red
Blue
Orange
IMP117-07
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