Harwil Q-12, Q-10 Installation Instruction Sheet

MODEL Q-12

REED SWITCH

Q-12N, Q-12CR, Q-12 DS (TEMPERATURE: QT-12)

INSTALLATION INSTRUCTION SHEET

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

½” OR ¾” NPT

APPLY TEFLON
SEALING TAPE

AS REQUIRED

(2-3 LAYERS)

ENCAPSULATED

MAGNET

ONE PIECE

BENDING BEAM

TARGET AND

MAGNET

SIDE VIEW

0.5”

0.65”

1.1” SMALL BODY

1.4” MEDIUM BODY

1.8” LARGE BODY

ENCAPSULATED

TOP VIEW

1.2”

• Pressure drop typically less than 1.0 psi
at rated flow.

• Mount in any position.

OPTION 3 GROMMET SELECTION CHART

Grommet

Size

A 0.25” B 0.375”

AA 0.33” C 0.50”

Cable OD Grommet

Size

Cable OD

OPTION 1

BASIC UNIT SUPPLIED WITH
TWO 0.187 x 0.020 MALE
SPADE TERMINALS RECESSED
IN ½” NPT NIPPLE SECTION.

OPTION 2

BASIC UNIT WITH TWO­CONDUCTOR INSTRUMENT
CABLE POTTED IN PLACE.
PVC TEE OPTIONAL.

FLUID FLOW SWITCH

ULTRA RELIABLE SINCE 1956 P. 1

OPTION 3

BASIC UNIT W/ DMP TAPERED
RUBBER GROMMET ATTACHMENT
FOR WATERTIGHT SEAL & STRAIN
RELIEF. PVC TEE OPTIONAL.

OPTION 4

BASIC UNIT WITH ½” FLEXIBLE
SPIRADUCT PLASTIC CONDUIT &
FITTINGS. ELECTRICAL CABLE NOT
SUPPLIED. PVC TEE OPTIONAL.

2D

5D

TURBULENT
FLOW REDUCTION

MOUNT IN
THREE POSITIONS

MODEL Q-12

Q-12N, Q-12CR, Q-12 DS (TEMPERATURE: QT-12)

INSTALLATION INSTRUCTIONS

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

Flow switch should be mounted at least 5 pipe diameters
downstream and 2 pipe diameters upstream of any source
of turbulence, such as valves, elbows, reducers, etc.

1. Remove unit from shipping box and inspect it for pos­sible damage (i.e., cracks, damaged threads, deformed
bending beam, etc.)

2. Check model number on label with that shown on
packing list vs. configuration actually received (return to
supplier if discrepancy is found).

3. Place a multimeter or equivalent test meter across the
two wire leads coming from the unit and check for
proper switch operation by gently moving bending
beam and magnetic assembly toward switch support
tube. Switch should activate when separation is in the
range ⁄” to ⁄”.

4. If no discrepancy is found, thread unit into appropriate
tee.

5. Care must be exercised during threading operation to

CAUTION

INSTALLATION
OR REMOVAL
OF FLOW
SWITCH FROM
SMALL TEE

insure threads are not crossed and the bending beam
target assembly does not touch the inside surface of the
tee.

NOTE: It may be necessary to test fit the unit in a tee
identical to the tee mounted in the flow line to ensure
adequate clearance during rotational insertion sequence.
For black iron and galvanized tees, check for possible hang
up of bending beam due to attraction of magnet to interior
metal wall.

6. Tighten unit in tee until fluid leaks are eliminated, flow
target is approximately centered along axis of pipe
and flow direction arrows located on unit are aligned
parallel with flow in pipe. When threading into PVC fit­tings 2-3 layers of Teflon sealing tape is recommended.
Tighten 2-3 turns beyond finger tight.

7. Complete wiring to signal processor, light, relay, etc.
per local code.

WIRING DIAGRAM

FLOW SWITCH

HOT

FROM POWER

SOURCE

TO LOAD

CORNER OF BLADE MAY HANG UP

WATCH THE BLADE TURNING

Temperature QT-12

A temperature sensor is
included on the QT models.
The wiring is Black-Red for
the switch and Green-White
for the temperature sensor.

USE A ROD OR SUITABLE TOOL
TO FREE ANY HANG UP IF IT OCCURS

ULTRA RELIABLE SINCE 1956P. 2