Honeywell NK User manual

Portable Indicator

User’s Guide

Sensotec Sensors

Model NK

Honeywell

Sensotec Sensors

2080 Arlingate Lane

Columbus, OH 43228, USA

Telephone: (614)850-5000

Fax: (614) 850-1111

Toll Free: 1-800-848-6564

E-mail: service@sensotec.com

http://www.honeywell.com/sensing

http://www.sensotec.com

Model NK Portable Indicator User’s Guide

Document Number: 008-0142-00

Rev. C: May, 2004

TABLE OF CONTENTS

1 Introduction . . . . . . . . . . . . . . . . .1

2 Setup and Use . . . . . . . . . . . . . . .3

2.1 Your Model NK . . . . . . . . . . . . . . . 3

2.2 Additional Tools . . . . . . . . . . . . . . . 4

2.3 Setup Overview . . . . . . . . . . . . . . . 4

2.4 Connect the Transducer . . . . . . . . 5

2.5 Turn On the Unit . . . . . . . . . . . . . . 8

2.6 Set the Decimal Point Location . . . 8

2.7 Verify Calibration . . . . . . . . . . . . . 11

2.8 Fine Tune . . . . . . . . . . . . . . . . . . 12

2.9 Using the Model NK . . . . . . . . . . . 13

3 Calibration . . . . . . . . . . . . . . . . .14

3.1 When to Calibrate . . . . . . . . . . . . 14

3.2 Methods of Calibration . . . . . . . . . 14

3.3 Calibration Overview . . . . . . . . . . 15

3.4 Center the Fine Tuning . . . . . . . . 16

3.5 Disable Scaling . . . . . . . . . . . . . . 16

3.6 Adjust for No Load . . . . . . . . . . . . 18

3.7 Adjust for a Known Load . . . . . . . 19

4 Options . . . . . . . . . . . . . . . . . . . .25

4.1 Peak Detector . . . . . . . . . . . . . . . 25

4.2 Analog Voltage Output . . . . . . . . . 26

4.3 High Input . . . . . . . . . . . . . . . . . . . 27

5 Maintenance and Repair . . . . . .28

5.1 Cleaning . . . . . . . . . . . . . . . . . . . . 28

5.2 Troubleshooting . . . . . . . . . . . . . . 28

6 Specifications . . . . . . . . . . . . . .32

6.1 Physical Characteristics . . . . . . . . 32

6.2 Environmental . . . . . . . . . . . . . . . 33

6.3 Power Supply . . . . . . . . . . . . . . . . 33

6.4 Transducer Interface . . . . . . . . . . 34

6.5 Amplifier . . . . . . . . . . . . . . . . . . . . 35

6.6 Digital Display . . . . . . . . . . . . . . . 36

6.7 Options . . . . . . . . . . . . . . . . . . . . . 37

7 Warranty . . . . . . . . . . . . . . . . . . .39

OFF ON

CALSHUNT

BATLOW

SPAN ZERO

PEAK

TRACK

1.8.8.8.8

Introduction 1

1Introduction

The Model NK Portable Indicator is a battery-powered signal conditioner and

readout device. The Model NK provides precise electrical drive to a transducer

and translates transducer output into a digital display of engineering units.

The signal conditioner supports transducer outputs between 1 and 4 millivolts/volt

(mV/V); a high input option supports outputs up to 40 mV/V. The excitation supply

drives transducers with impedances as low as 250 Ohm at 4 volts. The readout

device is a 4-½ digit, liquid-crystal display.

Enclosed in a rugged, weatherproof aluminum case, the Model NK is specially

designed for remote field operations. Quick field setup allows the Model NK to be

used for a variety of applications, from checking the load on an oil well drilling bit

to determining natural gas line pressure.

Introduction 2

Coarse zero and coarse span controls allow broad adjustment for a wide variety of

transducer outputs. To prevent accidental misadjustment, these controls are

located on the edge of the circuit board inside the unit, easily accessible when the

panel is removed from the case. Fine zero and fine span controls on the front panel

allow precise adjustment for offsets and gain variations up to +/-15 percent of full

scale.

An optional peak detector toggles between peak mode and track mode via a front-

panel switch. In both modes, the unit monitors the input signal. In peak mode, the

Model NK stores, digitizes, and displays the highest signal level.

Setup and Use 3

2 Setup and Use

2.1 Your Model NK

The Model NK can be purchased in one of two ways:

• As a stand-alone unit with a mating connector for the input connector

• As a set with a transducer and a mating connector for the input connector

Some transducers are equipped with integral cables that connect the transducer

to the Model NK. Separate cables are available for transducers without integral

cables.

If you purchased the Model NK with a transducer as a set, the unit is already

calibrated to that transducer. Follow the setup procedures in this section before

using the unit for the first time.

If you purchased the Model NK as a stand-alone unit or if you replaced the original

transducer, follow the setup and calibration procedures (page 14) before using the

unit for the first time.

Setup and Use 4

2.2 Additional Tools

Use the following tools to set up and calibrate your Model NK:

• Approximately 50 mm [2 in] of 0.50 mm2(or 20 AWG) wire (if needed)

• Needle-nose pliers

• Small, standard screwdriver

• Calculator

• Solder and soldering iron (if needed)

2.3 Setup Overview

1. Connect the transducer to the unit (page 5).

2. Turn on the unit (page 8).

3. Set the decimal point location (page 8).

4. Verify the calibration (page 11).

5. Fine tune (page 12).

Setup and Use 5

2.4 Connect the Transducer

2.4.1 Cable Type

Determine the distance between the transducer’s installed location and the Model

NK. If the distance is less than 10 m [30 ft], use a four-wire hookup. If it is greater

than 10 m [30 ft], use a six-wire hookup and the “sense” feature.

Transducers with integral cables generally have four wires, designated:

(+)Excitation

(–)Excitation

(+)Signal (or (+)Output)

(–)Signal (or (–)Output)

For long six-wire cables, the additional two wires are used for the “sense” feature

and are designated:

(+)Sense

(–)Sense

The “sense” feature reduces the effect of signal voltage loss over a long cable,

increasing display accuracy. The “sense” feature is only needed for cables longer

than 10 m [30 ft].

Setup and Use 6

2.4.2 Connection

Connect the transducer to the Model NK via the Model NK’s six-pin input

connector. Use the transducer’s integral cable if available. If the transducer is not

equipped with an integral cable, wire your own cable as follows:

•Four-wire hookup —Disable the “sense” feature by soldering two small

wires inside the mating connector to jumper:

(+)Excitation (pin A) to (+)Sense (pin B)

(–)Excitation (pin C) to (–) Sense (pin D)

IGURE

1: F

OUR

-W

IRE

RANSDUCER

OOKUP

ITHOUT

ENSING

)

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