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Honeywell NK User Manual

Honeywell NK User Manual

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Model NK
Portable Indicator
User's Guide
Sensotec Sensors

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  • Page 1 Model NK Portable Indicator User’s Guide Sensotec Sensors...
  • Page 2 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...

  • Page 3: Table Of Contents

    4.2 Analog Voltage Output ..26 2.1 Your Model NK ....3 4.3 High Input ....27 2.2 Additional Tools .
  • Page 4 1.8.8.8.8 SPAN ZERO SHUNT PEAK TRACK...

  • Page 5: Introduction

    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.
  • Page 6 An optional peak detector toggles between mode and mode via a front- peak track panel switch. In both modes, the unit monitors the input signal. In mode, the peak Model NK stores, digitizes, and displays the highest signal level. Introduction...

  • Page 7: Setup And Use

    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.

  • Page 8: Additional Tools

    2.2 Additional Tools Use the following tools to set up and calibrate your Model NK: • Approximately 50 mm [2 in] of 0.50 mm (or 20 AWG) wire (if needed) • Needle-nose pliers • Small, standard screwdriver • Calculator •...

  • Page 9: Connect The Transducer

    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.
  • Page 10 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: •...
  • Page 11 • Six-wire hookup — Jumpers are not needed in this configuration. 2: S IGURE RANSDUCER OOKUP ENSING Setup and Use...

  • Page 12: Turn On The Unit

    2.6 Set the Decimal Point Location The Model NK is factory set to the correct decimal point location for its original transducer. As a stand-alone product, it is factory set to xxx.xx. You can easily change the decimal point location to match your load and desired display.
  • Page 13 last digit, set the decimal point to xxxx.x. To set the decimal point location: 1. Remove the unit from the case by loosening all four captive fasteners on the front panel and lifting the panel out of the case. 2. Find the decimal point jumper locations (Figure 3: on page 10). 3.
  • Page 14 TOP OF FRONT PANEL DECIMAL POINT JUMPERS XXXX.X XXX.XX XX.XXX X.XXXX SHUNT CAL RESISTOR 3: D IGURE ECIMAL POINT JUMPER LOCATIONS Setup and Use...

  • Page 15: Verify Calibration

    2.7 Verify Calibration For best results, verify the calibration daily. Note: When not using the original transducer, calibrate the Model NK before use (page 14). 1. Obtain the following values from the transducer calibration data sheet: • Shunt-cal output (or “shunt-cal factor”) in mV/V •...

  • Page 16: Fine Tune

    2.8 Fine Tune Fine tune the Model NK (the controls for both are on the front zero span panel): —With no load on the transducer, use a small screwdriver to turn Fine zero potentiometer until the display reads 0000. zero —With the known load on the transducer, use a small...

  • Page 17: Using The Model Nk

    2.9 Using the Model NK Verify the calibration daily for best results. To use the Model NK, simply apply the load on the device to be measured and read the display. Recalibrate the Model NK each time you use it with a different transducer. For details about using the peak detector and other options, see page 25.

  • Page 18: Calibration

    3 Calibration 3.1 When to Calibrate Calibrate the Model NK if you are not using the original transducer and each time you change transducers. 3.2 Methods of Calibration Two methods of calibration are available: standard and shunt. Use standard calibration when you can place a known load on the transducer. Use shunt calibration to simulate the load when you cannot apply a known load or for quick field setup.

  • Page 19: Calibration Overview

    3.3 Calibration Overview Remove the unit from the case by loosening all four captive fasteners on the front panel and lifting the panel out of the case, then do the following: 1. Center the fine tuning (page 16). 2. Turn off the scaling (page 16). 3.

  • Page 20: Center The Fine Tuning

    3.4 Center the Fine Tuning Center the fine-tuning potentiometers to allow precise adjustment zero span in either direction. Use a small screwdriver to turn each potentiometer up to 15 turns clockwise until it clicks. Then, turn it back halfway, 7-½ turns counterclockwise (see Figure 4: on page 17).
  • Page 21 4: P IGURE OTENTIOMETER OCATIONS Calibration...

  • Page 22: Adjust For No Load

    3.6 Adjust for No Load 1. Remove any load from the transducer. —This control zeroes the display when the is out of Coarse zero fine zero range or the transducer has a preload, offset, or tare. Use a small screwdriver to turn the potentiometer until the coarse zero display reads approximately 0000 (Figure 4 on page 17).

  • Page 23: Adjust For A Known Load

    3.7 Adjust for a Known Load If you can apply a known load to the transducer, use the standard calibration method. If you cannot apply a known load, use the shunt calibration method (page 21). 3.7.1 Standard Calibration —This control adjusts the span for each different transducer. Coarse span a.
  • Page 24 —With the known load applied, use a small screwdriver to turn Fine span potentiometer until the display reads exactly 19999 (or the fine span scaled-down value). —This control scales the display to the desired units. Scaling With the known load applied, use a small screwdriver to turn the scaling potentiometer until the display reads the desired full-scale engineering units (found on the transducer’s calibration sheet or the result of step 1c).
  • Page 25 3.7.2 Shunt Calibration Use shunt calibration when you cannot apply a known load to the transducer. When the button is pressed (with no load on the transducer), a precise shunt cal resistor of known value is shunted across one leg of the transducer. This resistor simulates a known load or pressure.
  • Page 26 1. From the transducer calibration data sheet, obtain the following values: • Shunt-cal output (or “shunt-cal factor”) in mV/V • Calibration factor (or “full-scale output”) in mV/V • Full-scale engineering units (or “capacity”) in psig, lbs, etc. —This control alters the gain of the amplifier or readjusts the Coarse span span when calibrating to a different transducer.
  • Page 27 —This control scales the display to the desired units. Determine Scaling the scaled shunt-cal value using the following formula: With no load on the transducer, press and hold the button. Use a shunt cal small screwdriver to adjust the potentiometer until the display scaling reads the scaled shunt-cal engineering units.
  • Page 28 Shunt Calibration Example: The following values are taken from a typical transducer calibration data sheet: • shunt-cal output = 1.4683 mV/V • calibration factor = 2.9999 mV/V • full-scale units = 25 psig To calculate the unscaled shunt-cal display value (as in step 2 on page 22): To calculate the scaled shunt-cal value (as in step 4 on page 23): Calibration...

  • Page 29: Options

    • Analog voltage output • High input See below for brief descriptions of the Model NK options. For more information about the options, contact our Sales Department. 4.1 Peak Detector The peak detector operates in two modes: . In both modes, the unit...

  • Page 30: Analog Voltage Output

    If the Model NK identifies a higher peak, the peak detector reactivates to record and display the new value. To cancel a displayed peak value, flip the switch to peak/track track mode, the peak detector continuously follows the input signal but does not track store the highest value.

  • Page 31: High Input

    4.3 High Input A “low-gain” version of the Model NK is available which supports transducer outputs between 10 and 40 mV/V. The Model NK can also be field-converted for high input. For more information, contact our Service department. Options...

  • Page 32: Maintenance And Repair

    5 Maintenance and Repair 5.1 Cleaning Clean the exterior and front panel of the Model NK with a damp (not wet) soft cloth. 5.2 Troubleshooting 5.2.1 Low Battery The red light on the front panel indicates that the battery voltage is low battery below 4.6 volts or that a battery is installed incorrectly.
  • Page 33 3. Replace all four “D” batteries, matching polarities to the indications on the battery holder. 4. Replace the front panel and tighten the fasteners. Maintenance and Repair...
  • Page 34 5.2.2 Overrange indications Note: The Model NK indicates an overrange condition by a flashing left arrow on the display. An overrange indication often results from faulty “sense” pin wiring (such as a missing or broken wire). Determine the source of the problem using the following procedure: 1.
  • Page 35 5. If an overrange indication is still present, the problem may be with the Model NK. Contact our Service Department. 5.2.3 Erratic readings Erratic readings could indicate that the batteries are weak. 1. Check the batteries for low voltage or mismatched polarities. Replace weak batteries.

  • Page 36: Specifications

    6 Specifications 6.1 Physical Characteristics Size 178 mm x 127 mm x 127 mm [7.0 in x 5.0 in x 5.0 in] Number of channels Material deep-drawn, weatherproof aluminum case Weight (including 1.6 kg [3.5 lb] batteries) Specifications...

  • Page 37: Environmental

    6.2 Environmental -28 °C to 65 °C [-20 °F to 150 °F] Temperature, storage 0 °C to 55 °C [32 °F to 130 °F] Temperature, operating 6.3 Power Supply Battery type 4 D cells (alkaline recommended) Battery life 250 hours (for alkaline) Note: To safeguard the circuitry, remove the batteries when not using the unit for a long period of time.

  • Page 38: Transducer Interface

    6.4 Transducer Interface Transducer excitation 4 Vdc (constant voltage) Transducer output range 1 to 4 mV/V 10 to 40 mV/V (high input option) Transducer bridge range 250 Ohm minimum Electrical connector type Bendix/Amphenol PT02A-10-6S Mating connector type Bendix/Amphenol PT06A-10-6P(SR); (included) (part number 023-0086-00) Zero balance +/-15% full scale (minimum)

  • Page 39: Amplifier

    6.5 Amplifier Full-scale output (optional) 0-1V (output impedance < 1 Ohm) Non-linearity (% F.S.) (max.) +/-0.02% Drift (max. zero and span) +/-5 mV Zero stability (% F.S./yr.) 0.1% Span stability (% F.S./yr.) 0.1% Fine span adj. (% range) +/-15% Coarse span adj. (% range) 100% Fine zero adj.

  • Page 40: Digital Display

    6.6 Digital Display Type liquid-crystal display (LCD) Number of Display Characters 4-½ digits Character size 12 mm [0.5 in] Conversion rate 1.5 / second Scaling 0-19999 Scaling method potentiometer Maximum display count 19999 Polarity indications? Programmable decimal points? yes Overrange indicator flashing left arrow Resolution 1/20000...

  • Page 41: Options

    6.7 Options High Input 0-40 mV/V Analog Voltage Output 0-1 Vdc (2 mA maximum) Peak/hold detector bleed rate of 0.01%/second or less Specifications...
  • Page 42 Specifications...

  • Page 43: Warranty

    However, we assume no responsibility for its use. While we provide applications assistance personally, through our literature and the Honeywell web site, it is up to the customer to determine the suitability of the product in the application. Warranty...
  • Page 44 Honeywell Automation and Control Solutions Sensotec Sensors 2080 Arlingate Lane Columbus, Ohio 43228-4112 Tel: (614)850-5000 Fax: (614)850-1111 E-mail: service@sensotec.com http://www.honeywell.com/sensotec Document Number 008-0142-00 Printed in USA Copyright 2004 Honeywell International Inc.

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