Honeywell NK User manual

Portable Indicator
User’s Guide
Sensotec Sensors
Model NK

Honeywell
Sensotec Sensors
2080 Arlingate Lane
Columbus, OH 43228, USA
Telephone: [phone]
Fax: [phone]
Toll Free: 1-800-848-6564
E-mail: [e-mail]
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)
F IGURE 1: F OUR -W IRE T RANSDUCER H OOKUP (W ITHOUT S ENSING )