United Electric Controls J21K User manual

GENERAL
BEFORE INSTALLING, CHECK THE SENSOR MODEL SELECTED
FOR COMPATIBILITY TO THE PROCESS MEDIA IN CONTACT
WITH THE SENSOR AND WETTED PARTS.
J21K Differential Pressure Switch utilizes opposing metal bellows to detect
pressure differences between two pressure sources. The bellows are
connected to a mechanical linkage. When the pressure at the high port
exceeds the pressure at the low port by a pre-determined amount, the
mechanism operates a snap-action electrical switch. The predetermined
actuation pressure can be adjusted by the user as described below.
Part I - Installation
Tools Needed
- Adjustable wrenches (2)
- Flat blade screwdriver
MOUNTING
INSTALL UNIT WHERE SHOCK, VIBRATION AND TEMPERATURE
FLUCTUATIONS ARE MINIMAL. MOUNT UNIT SO THAT
MOISTURE IS PREVENTED FROM ENTERING THE ENCLOSURE.
DO NOT MOUNT UNIT IN AMBIENT TEMPERATURES EXCEEDING
PUBLISHED LIMITS.
Surface mount in any position via two mounting ears. Never turn this unit
by grasping enclosure. Always hold a wrench on the bellows housing (or
fitting) when connecting pressure joints.
WIRING
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT.
WIRE UNITS ACCORDING TO NATIONAL AND LOCAL
ELECTRICAL CODES. MAXIMUM RECOMMENDED WIRE SIZE
IS 14 AWG.
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 (2) screws retaining the cover and gasket. Remove cover.
Connect conduit to the enclosure using a conduit fitting that is suitable for
your installation. A watertight conduit fitting (option M900 or equivalent)
must be used for NEMA 4 protection. Wire directly to the switch terminals
in accordance with local and national electrical codes. Bring the wires up to
the terminals from the rear of the enclosure to prevent interference with the
mechanism.
Part II - Adjustments
Tools Needed
- 5/16" open end wrench
For set point adjustment and re-calibration, connect the unit to a calibrated
pressure source.
Set point adjustment is achieved by varying the gap between the mechanical
actuator and the plunger on the electrical switch
J21K
To raise the differential pressure setting, turn the 5/16" hex head screw out
(to the left).
To lower the differential pressure setting, turn the 5/16" hex head screw in
(to the right).
IMJ21K-01
Differential Pressure Switch
Type J21K
UNITED ELECTRIC
CONTROLS
Installation and Maintenance
Instructions
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended Practices, Liabilities
and Warranties.

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1/4 NPT
1/2 NPT
1/4 NPT
1/4 NPT
Dimension A
Models Inches mm NPT
127-150 8.06 140,72 1/4
S127B-SI50B 8.86 123,34 112
232 6.64 122,17 1/4
254 6.52 123,44 1/4
357 6.86 125,48 1/4
Dimensions RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration of the following factors
when specifying and installing UE pressure and temperature units. Before installing a unit, the
Installation and Maintenance instructions provided with unit must be read and understood.
• To avoid damaging unit, proof pressure and maximum temperature limits stated in lit-
erature and on nameplates must never be exceeded, even by surges in the system. Operation
of the unit up to maximum temperature is acceptable on a limited basis (i.e., start-up, testing)
but continuous operation must be restricted to the designated adjustable range. Excessive
cycling at maximum temperature limits could reduce sensor life.
• A back-up unit is necessary for applications where damage to a primary unit could
endanger life, limb or property. A high or low limit switch is necessary for applications where
a dangerous runaway condition could result.
• The adjustable range must be selected so that incorrect, inadvertent or malicious
setting at any range point cannot result in an unsafe system condition.
• Install unit where shock, vibration and ambient temperature fluctuations will not dam-
age unit or affect operation. Orient unit so that moisture does not enter the enclosure via
the electrical connection. When appropriate, this entry point should be sealed to prevent
moisture entry.
• Unit must not be altered or modified after shipment. Consult UE if modification is
necessary.
• Monitor operation to observe warning signs of possible damage to unit, such as drift
in set point or faulty display. Check unit immediately.
• Preventative maintenance and periodic testing is necessary for critical applications
where damage could endanger property or personnel.
• For all applications, a factory set unit should be tested before use.
• Electrical ratings stated in literature and on nameplate must not be exceeded.
Overload on a switch can cause damage, even on the first cycle. Wire unit according to
local and national electrical codes, using wire size recommended in installation sheet.
• Do not mount unit in ambient temp. exceeding published limits.
LIMITED WARRANTY
Seller warrants that the product hereby purchased is, upon delivery, free from defects
in material and workmanship and that any such product which is found to be defec-
tive in such workmanship or material will be repaired or replaced by Seller (F.O.B. UE
Watertown); provided, however, that this warranty applies only to equipment found
to be so defective within a period of 18 months from the date of manufacture by the
Seller. Seller shall not be obligated under this warranty for alleged defects which
examination discloses are due to tampering, misuse, neglect, improper storage, and in
any case where products are disassembled by anyone other than authorized Seller’s
representatives.
EXCEPT FOR THE LIMITED WARRANTY OF REPAIR AND REPLACEMENT STATED ABOVE,
SELLER DISCLAIMS ALL WARRANTIES WHATSOEVER WITH RESPECT TO THE PRODUCT,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
LIABILITY LIMITATION
SELLER’S LIABILITY TO BUYER FOR ANY LOSS OR CLAIM, INCLUDING LIABILITY INCURRED
IN CONNECTION WITH (I) BREACH OF ANY WARRANTY WHATSOEVER EXPRESSED OR
IMPLIED, (II) A BREACH OF CONTRACT, (III) A NEGLIGENT ACT OR ACTS (OR NEGLIGENT
FAILURE TO ACT) COMMITTED BY SELLER, OR (IV) AN ACT FOR WHICH STRICT LIABILITY
WILL BE IMPUTED TO SELLER, IS LIMITED TO THE LIMITED WARRANTY OF REPAIR AND
REPLACEMENT STATED HEREIN. IN NO EVENT SHALL THE SELLER BE LIABLE FOR ANY
SPECIAL, INDIRECT, CONSEQUENTIAL OR OTHER DAMAGES OF A LIKE GENERAL NATURE,
INCLUDING, WITHOUT LIMITATION, LOSS OF PROFITS OR PRODUCTION, OR LOSS OR
EXPENSES OF ANY NATURE INCURRED BY THE BUYER OR ANY THIRD PARTY.
UE specifications subject to change without notice.
Models 127-150 Models S127B-S150B
Models 232 Models 254
Models 357
UNITED ELECTRIC
CONTROLS
180 Dexter Avenue, P.O. Box 9143
Watertown, MA 02472-9143 USA
Telephone: [phone]
Fax: [phone]
http://www.ueonline.com
EMCO10M1001
IMJ21K-01