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Maintenance and Repair

30

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. Check all electrical connections for continuity.
2. Check the wiring code for pin layout.
3. Verify that the unit was set up according to the instructions in this manual.
4. Determine if the problem is with the transducer or the Model NK:

a. Remove the transducer from the Model NK.
b. Jumper 

(-)Output 

(pin E) and (

+)Output

 (pin F).

c. If the display reads close to

 0000

, the transducer may be faulty. 

Try using another transducer with the Model NK, calibrating first.

Содержание NK

Страница 1: ...Portable Indicator User s Guide Sensotec Sensors Model NK ...

Страница 2: ...olumbus 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 ...

Страница 3: ...ate 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 ...

Страница 4: ...OFF ON CAL SHUNT BAT LOW SPAN ZERO PEAK TRACK 1 8 8 8 8 ...

Страница 5: ...s 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 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 var...

Страница 6: ...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 ...

Страница 7: ... 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 transduce...

Страница 8: ...m 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 ...

Страница 9: ...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 ...

Страница 10: ...tegral 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 FIGURE 1 FOUR WIRE TRANSDUCER HOOKUP WITHOUT SENSING ...

Страница 11: ...Setup and Use 7 Six wire hookup Jumpers are not needed in this configuration FIGURE 2 SIX WIRE TRANSDUCER HOOKUP WITH SENSING ...

Страница 12: ...ocation 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 Each decimal point has two terminals that must be connected For example to set the decimal point to xxxx x for a 1000 psig load jumper the first and second t...

Страница 13: ...ation 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 Use needle nose pliers to remove the existing jumper and place it in the desired terminals ...

Страница 14: ...Setup and Use 10 FIGURE 3 DECIMAL POINT JUMPER LOCATIONS SHUNT CAL RESISTOR XXXX X XXX XX XX XXX X XXXX DECIMAL POINT JUMPERS TOP OF FRONT PANEL ...

Страница 15: ...libration factor or full scale output in mV V Full scale engineering units or capacity in psig lbs etc 2 Perform this calculation and record the value Note Place a decimal point in the full scale engineering units value in the equation in the same place as set in the display 3 With no load on the transducer press and hold the shunt cal button Compare the displayed value with the result of step 2 I...

Страница 16: ...an With the known load on the transducer use a small screwdriver to adjust the span potentiometer until the display matches your known load OR With no load on the transducer press and hold the shunt cal button Use a small screwdriver to adjust the span potentiometer until the display matches the value calculated on page 11 Note Turn the potentiometer clockwise to increase the displayed value Turn ...

Страница 17: ...n 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 ...

Страница 18: ...ransducer 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 ...

Страница 19: ...nel 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 Adjust for no load page 18 4 Adjust for a known or calculated load page 19 standard calibration page 21 shunt calibration 5 Adjust the scaling page 19 standard calibration page 21 shunt calibration ...

Страница 20: ...eter up to 15 turns clockwise until it clicks Then turn it back halfway 7 turns counterclockwise see Figure 4 on page 17 3 5 Disable Scaling Scaling is the ratio of the output voltage to the displayed reading Disable scaling so it does not interfere with calibration Use a small screwdriver to turn the scaling potentiometer up to 15 turns clockwise until it clicks see Figure 4 on page 17 ...

Страница 21: ...Calibration 17 FIGURE 4 POTENTIOMETER LOCATIONS ...

Страница 22: ...fset or tare Use a small screwdriver to turn the coarse zero potentiometer until the display reads approximately 0000 Figure 4 on page 17 3 Fine zero Use a small screwdriver to turn the fine zero potentiometer on the front panel until the display reads exactly 0000 Note Turn the potentiometer clockwise to increase the displayed value Turn it counterclockwise to decrease the displayed value ...

Страница 23: ...n 1 Coarse span This control adjusts the span for each different transducer a Apply a known load near full scale to the transducer b Use a small screwdriver to turn the coarse span potentiometer counterclockwise until the display reads approximately 19999 c If the known load is not full scale scale down this value proportionately For example if you apply an 80 lb load to a 100 lb transducer scale ...

Страница 24: ... to the desired units 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 After scaling return the panel to the case and tighten the four captive fasteners If the display does not read 0000 fine tune the unit again according to the ...

Страница 25: ...esistor simulates a known load or pressure The internal shunt cal resistor is installed on two pin jacks on the bottom of the circuit board see Figure 4 on page 17 Note The internal shunt cal resistor is normally 59 kOhm To install a different calibration resistor remove the present resistor from the jack and plug in a new one See the information sheet supplied with the transducer for the recommen...

Страница 26: ...a different transducer Determine the unscaled shunt cal display value using the following formula With no load on the transducer press and hold the shunt cal button Use a small screwdriver to adjust the coarse span potentiometer until the display reads approximately the unscaled shunt cal display value 3 Fine span With no load on the transducer press and hold the shunt cal button Use a small screw...

Страница 27: ... on the transducer press and hold the shunt cal button Use a small screwdriver to adjust the scaling potentiometer until the display reads the scaled shunt cal engineering units After scaling return the panel to the case and tighten the four captive fasteners If the display does not read 0000 fine tune the unit again according to the procedure on page 12 ...

Страница 28: ... 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 ...

Страница 29: ...tment 4 1 Peak Detector The peak detector operates in two modes peak and track In both modes the unit monitors the input signal Use the toggle switch on the front panel to select the desired mode The peak detector always operates in either peak or track mode In peak mode the Model NK detects and displays the highest positive peak signal level After two conversions of the analog to digital converte...

Страница 30: ...lue flip the peak track switch to track In track mode the peak detector continuously follows the input signal but does not store the highest value 4 2 Analog Voltage Output An optional 0 1 volt analog output is available for example to connect to a chart recorder For this option a double banana plug jack positive red terminal is mounted on the front panel Loading current must not exceed 2 mA ...

Страница 31: ...h 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 ...

Страница 32: ...elow 4 6 volts or that a battery is installed incorrectly Although the unit can be operated with weak batteries it may produce inaccurate readings Note We recommend alkaline batteries To safeguard the circuitry remove the batteries when not using the unit for a long period of time Replace the batteries according to the following procedure 1 Flip the on off toggle switch on the front panel to off 2...

Страница 33: ...Maintenance and Repair 29 3 Replace all four D batteries matching polarities to the indications on the battery holder 4 Replace the front panel and tighten the fasteners ...

Страница 34: ...lem using the following procedure 1 Check all electrical connections for continuity 2 Check the wiring code for pin layout 3 Verify that the unit was set up according to the instructions in this manual 4 Determine if the problem is with the transducer or the Model NK a Remove the transducer from the Model NK b Jumper Output pin E and Output pin F c If the display reads close to 0000 the transducer...

Страница 35: ...t 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 2 If the batteries are strong and installed properly but erratic readings are still present contact our Service Department ...

Страница 36: ...s 32 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 1 Material deep drawn weatherproof aluminum case Weight including batteries 1 6 kg 3 5 lb ...

Страница 37: ...eguard the circuitry remove the batteries when not using the unit for a long period of time Temperature storage 28 C to 65 C 20 F to 150 F Temperature operating 0 C to 55 C 32 F to 130 F Battery type 4 D cells alkaline recommended Battery life 250 hours for alkaline ...

Страница 38: ...er 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 included Bendix Amphenol PT06A 10 6P SR part number 023 0086 00 Zero balance 15 full scale minimum Noise and Ripple 30 µV ...

Страница 39: ...tput 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 range 15 Coarse zero adj range 100 ...

Страница 40: ...racters 4 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 yes Programmable decimal points yes Overrange indicator flashing left arrow Resolution 1 20000 Maximum sensitivity 0 1 µV count ...

Страница 41: ...Specifications 37 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 ...

Страница 42: ...Specifications 38 ...

Страница 43: ... The foregoing is the Buyer s sole remedy and is in lieu of all other warranties expressed or implied including those of merchantability and fitness for a particular purpose Specifications may change without notice The information we supply is believed to be accurate and reliable as of this printing However we assume no responsibility for its use While we provide applications assistance personally...

Страница 44: ...A Copyright 2004 Honeywell International Inc 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 ...

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