Kenco Engineering KMD Transmitter User Manual

KENCO ENGINEERING COMPANY

P.O. BOX 470426, TULSA, OK 74147-0426

PHONE: [phone] FAX: [phone]

http://www.kenco-eng.com e-mail: [e-mail]

KENCO Loop Powered Magnetostrictive Transmitter

KMD SERIES – Operation and Installation Manual

Table of Contents

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Section Page

1. INTRODUCTION 2

2. PRODUCT DESCRIPTION 2

Mounting Instructions / Transmitter Dimensions 3

3. TRANSMITTER FEATURES 4

4. PRINCIPLE OF MAGNETOSTRICTION 4

5. TRANSMITTER SPECIFICATIONS 5

6A. ELECTRICAL CONNECTIONS AND WIRING PROCEDURES 6

6B. NOTES FOR ELECTRICAL CONNECTIONS 7

6C. LOOP RESISTANCE VS. POWER SUPPLY 8

6D. RECOMMENDED SAFETY BARRIERS FOR INTRINSICALLY 8

SAFE INSTALLATIONS

7. SYSTEM CHECK 9

8. MAINTENANCE 9

9. UNITS OF MEASURE FOR KMD TRANSMITTER 9

10. CALIBRATION PROCEDURES USING FRONT PANEL DISPLAY 10

11. OTHER SETTINGS AVAILABLE ON LCD PANEL DISPLAY 11

12. ADJUSTMENTS FOR TRANSMITTER VIA 11-13

HART‚ COMMUNICATIONS

1. INTRODUCTION
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KENCO is pleased to update its loop powered magnetostrictive
transmitter with the latest innovations in magnetostrictive
technology, as well as adding new features to the product offering.
The KENCO KMD Series magnetostrictive transmitter is designed
solely for use with the KENCO magnetic liquid level indicator, the
Magna-Site. The transmitter electronically monitors the location of
the magnetic float within the Magna-Site gauge housing, providing
an output in a unit of measure as a % of span or a 4-20 mA output.
The KMD series also incorporates HART® communications and a
visual display as part of the standard offering.

2. PRODUCT DESCRIPTION
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KENCO transmitters electronically monitor the location of the
magnetic float within the Magna-Site gauge housing, providing an
output in a unit of measure as a % of span or a 4-20 mA output. The
transmitter is available up to a length of 300 inches. Zero and span
may be adjusted by using the HART® communications protocol or it
may be manually calibrated using the keypad display inside of the
explosion proof housing. These transmitters operate within a process
temperature range of – 40°F to 300°F. Field replaceable electronics
are potted and encapsulated. KENCO transmitters are available as
standard with NEMA 4X/7 explosion-proof housings. These housings
feature an industrial epoxy coating for corrosion resistance. All
KENCO level transmitters use non-contacting, magnetostrictive
technology. This simple design ensures no scheduled maintenance or
re-calibration – ever. Accurate, non-contact float location sensing is
achieved with absolutely no wear to any of the sensing elements.

Mounting Instructions / Transmitter Dimensions

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The KMD Transmitter is mounted directly to the housing of the Magna­Site. In a typical application, the magnetic flag assembly is attached to
the gauge housing chamber with hose clamps which have been welded to
the back of the flag assembly, typically 180° from the flanged or threaded
connections to the tank. Install the transmitter at least 90° to the right or
the left of the flag assembly (your choice) by placing the outer pipe of the
transmitter body adjacent to the gauge housing. Tighten the hose clamp of
the flag assembly around the outer pipe of the transmitter. Allow for the
inactive zone of 3 inches at the bottom of the transmitter by placing
transmitter bottom 3 inches below the zero setting. Your application will
allow for 5 inches of clearance at the top of the outer pipe. See dimensional
information below.

Note: In a typical application, KENCO adds 2 inches to the order length so
that the customer has additional mounting flexibility. Units are factory
calibrated with the additional 2 inches at the top of the gauge, bringing the
total inactive zone at the top to 7”.

9999 999999 9999

9999 999999 9999

3. TRANSMITTER FEATURES

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• CSA approved explosion-proof enclosure

• Digital Display for zero and span settings and readout

• Readout is updated every 3 seconds

• Readout available as a % of span, a 4-20 mA output or any unit of
measure

• Adjustments may be made using a HART ® hand held communicator

• Repeatability is .005% full span or .005 inches

• Temperature range: - 40°F to 300°F (call KENCO for higher temperature
requirements)

• No maintenance required

• Immune from electrical and mechanical noise

4. PRINCIPLE OF MAGNETOSTRICTION

The level transmitter is composed of 2
concentric members. The outermost
member is a protective 316 stainless
chamber that withstands aggressive
environments. Inside of the chamber
is the waveguide, a formed element
constructed of a proprietary
magnetostrictive material.

A pulse is induced in the waveguide by
the momentary interaction of 2
magnetic fields, one from an electric
current pulse launched along the
waveguide and the other from the
magnets inside the float. This
interaction produces a strain pulse
that travels along the waveguide. The
location of the magnet inside the float
is determined by measuring the
elapsed time between the launching of
the electronic pulse and the detection
of the strain pulse that travels along
the waveguide. The location of the
magnet inside the float is determined
by measuring the elapsed time between
the launching of the electronic pulse
and the detection of the strain pulse by
the sensor head. The time period
measurement is used to produce an
output reading of the float location.