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KENCO ENGINEERING COMPANY

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

PHONE: (918) 663-4406 FAX: (918) 663-4480

http://www.kenco-eng.com e-mail: info@kenco-eng.com

KENCO Loop Powered Magnetostrictive Transmitter

KMD SERIES – Operation and Installation Manual

Table of Contents

__________________________________________________________________________________________

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

Summary of content (13 pages)

PAGE 1
KENCO ENGINEERING COMPANY P.O. BOX 470426, TULSA, OK 74147-0426 PHONE: (918) 663-4406 FAX: (918) 663-4480 http://www.kenco-eng.com e-mail: info@kenco-eng.com KENCO Loop Powered Magnetostrictive Transmitter KMD SERIES – Operation and Installation Manual Table of Contents __________________________________________________________________________________________ Section Page 1. INTRODUCTION 2 2. PRODUCT DESCRIPTION 2 Mounting Instructions / Transmitter Dimensions 3 3. TRANSMITTER FEATURES 4 4.
PAGE 2
1. INTRODUCTION ____________________________________________________________ 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.
PAGE 3
Mounting Instructions / Transmitter Dimensions ________________________________________________________________________________________________ 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.
PAGE 4
3. TRANSMITTER FEATURES ____________________________________________________________________________________________________________________ • • • • • • • • • 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 .
PAGE 5
. TRANSMITTER SPECIFICATIONS ________________________________________________________________________________________________________________________ Parameter Level Output Specifications Measured Variable Full Range Non-Linearity Full Span Repeatability Sensor Operating Temp. Liquid Level (as determined by location of magnetic float) 18” to 300” 0.020 F.S. or 1/32”, whichever is greater 0.01% F.S.
PAGE 6
A. ELECTRICAL CONNECTIONS AND WIRING PROCEDURES ___________________________________________________________________________________________________________________ A typical intrinsically safe connection for the KMD Transmitter includes protective safety barriers, a power supply, and a reading or monitoring device.
PAGE 7
6B. NOTES FOR ELECTRICAL CONNECTIONS _____________________________________________________________________________________________________________ 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. For intrinsically safe installations, wiring shall be installed in accordance with the country in use. Example given: Canadian Electrical Code, Part 1, National Electric Code ANSI/NFPA 70 Article 504-30. Shielded twisted cable of 24 AWG or heavier should be used.
PAGE 8
6C. LOOP RESISTANCE VS. POWER SUPPLY ______________________________________________________________________________________________________________ INSUFFICIENT OPERATING POWER SAFE OPERATING POWER EXCESS OPERATING POWER 6D. RECOMMENDED SAFETY BARRIERS FOR INTRINSICALLY SAFE INSTALLATIONS ____________________________________________________________________________________________________________ NOTES: 1. When selecting barrier types, the electrical specifications for the transmitter are: • Vmax = 36.
PAGE 9
7. SYSTEM CHECK AND ALARM SETTINGS ______________________________________________________________________________________________________________ System Check After completing the wiring, the system is ready to be checked out. Apply power to the unit. Using a DC voltmeter, measure the voltage at Loop 1 connection. The voltage must be > 10.5 v. If the voltage level is too low, shut down the system. Check for shorts, power supply voltage, and excessive loop resistance.
PAGE 10
. CALIBRATION PROCEDURES USING FRONT PANEL DISPLAY ____________________________________________________________________________________________________________________ The KENCO level transmitter can be bench-calibrated with the display and the three push buttons. Please follow these procedures: 1. Change the mode of operation from the Run Mode to the Program Mode. To enter the Program Mode, press any of the following keys: Up, Down or Enter (see diagram below).
PAGE 11
. OTHER SETTINGS AVAILABLE ON LCD PANEL DISPLAY ____________________________________________________________________________________________________________________ Adjust LCD Contrast. This function allows the operator to adjust the brightness of the LCD readout. 1. 2. 3. 4. 5. 6. Change the mode of operation from the Run Mode to the Program Mode. To enter the program mode, press any of the following keys: Up, Down, or Enter (see diagram on previous page). Calibrate Level 1? appears on screen.
PAGE 12
. ADJUSTMENTS FOR TRANSMITTER (cont’d) HART® Quick Start The KMD transmitter can be calibrated using a HART® Model 275 hand-held terminal. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Be sure you have the transmitter Loop #1 connected to a load of 250 to 500 ohms. A unit installed in a control loop is a good example of this loop load. You may also use a load resistor in the range of the above value. Be sure the transmitter is connected to a clean 24 VDC power supply.
PAGE 13
12. ADJUSTMENTS FOR TRANSMITTER (cont’d) 11. 12. You are back in the “Range Values” screen. If the numbers for lower and upper are correct, press the “Send “ key. You will get a “WARNING!” Press the “OK” button. You will again get “WARNING!” Press “OK” again. Startup is now complete.