AMETEK® PK II Pneumatic Deadweight Tester
Contents
1. 13 5 1 Ball and Nozzle 13 5 1 1 Removing the Nozzle 13 5 1 2 Removing the Ball 13 5 1 3 Cleaning the Ball and Nozzle 13 5 1 4 Cleanliness Check 13 5 2 Leveling the Tester 13 5 2 1 Fast Leveling 13 5 2 2 Fine Leveling 13 5 3 Connection 14 6 0 OPERATING INSTRUCTIONS 15 7 0 MAINTENANCE2. 10 2d Pressure in Kilopascals 11 2e Pressure in Centimeters of Water 20 C 11 2f Pressure in Bar 12 2g Pressure in Millimeters of Mercury 12 PRODUCT WARRANTY This instrument is warranted against defects in workmanship material and design for one 1 year from date of delivery to the extent that AMETEK will at its sole option repair or replace the instrument or any part thereof which is defective provided however that this warranty shall not apply to instruments subjected to tampering or abuse or exposed to highly corrosive conditions THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES WHETHER EXPRESS OR IMPLIED AND AMETEK HEREBY DISCLAIMS ALL OTHER WARRANTIES INCLUDING WITHOUT LIMITATION ANY WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY AMETEK SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO ANY ANTICIPATED OR LOST PROFITS This warranty is voidable if the purchaser fails to follow any and all instructions warnings and cautions in the instrument s Instruction Manual If a man
3. 16 7 1 Output System 16 7 2 Input System 17 Page 3 TABLE OF CONTENTS Page 8 0 TROUBLESHOOTING 18 8 1 Correcting For Poor Weight Rotation 18 8 2 Output and Internal Leakage 18 8 2 1 Output Connection Leakage 18 8 2 2 Internal Leakage Within the Tester 18 8 3 Replacing the Nozzle and O Ring 18 9 0 PARTS LIST 19 TABLES Page 2a Pressure in PSIG 9 2b Pressure in Inches of Water 20 C 10 2c Pressue in Grams per Square Centimeter
4. 21 7 0 MAINTENANCE 7 1 OUTPUT SYSTEM The PK II tester features an output tank that may be cleaned If any contamination is evident in the output system it may be easily removed using the following procedure Step 1 Remove the weights and weight carrier from the tester leaving the ceramic ball in place Step 2 Connect an air supply to the tester Step 3 Disconnect the output line 22 Step 4 Fully open both the INLET and OUTLET valves Step 5 While holding the ceramic ball to ensure that the ball does not fall out tilt the tester so that the output connection is pointing down ward Step 6 Pressure the ball into its socket to provide an output pressure sufficient to purge the sys tem Step 7 After completing Steps 1 6 disconnect the air supply from the INLET and connect the air supply to the OUTLET DO NOT APPLY PRES SURE AT THIS TIME Step 8 Using a screw driver remove the ceramic ball and restriction tube The restriction tube is located under the ceramic ball 23 Step 9 Remove the nozzle Step 10 Place a cloth or absorbent material over the nozzle body Step 11 Apply 15 to 30 PSI to the OUTLET for a few seconds or until the material on the nozzle body is clean and dry when removed Mild solvents may be applied to the outlet fitting and flushed out when applying pressure If a solvent is used it should not leave any film or residue once dried Step 12 Clean the outp
5. 1 AMETEK PK II Pneumatic Deadweight Tester Operating Instructions FORM 85 02 June 1999 Revision 6 CALIBRATION INSTRUMENTS 2 TABLE OF CONTENTS 1 0 INTRODUCTION AND PRODUCT OVERVIEW 4 1 1 PRODUCT FEATURES 4 1 2 PK II PHYSICAL DIMENSIONS 5 2 0 CORRECTION FACTORS 6 2 1 Corrections for Gravity 6 2 2 Corrections for Temperature 7 2 3 Corrections for Air Head 8 3 0 RECOMMENDED RECERTIFICATION PROCEDURE 8 3 1 Frequency of Certification 8 3 2 Materials Necessary for Recertification 8 4 0 SPECIFICATIONS 9 5 0 ASSEMBLY AND SETUP
6. 5 1 4 Ball amp Nozzle Cleanliness Check The ball should pass smoothly through the nozzle bore without any restriction or friction If resistance is felt reclean the ceramic ball and nozzle and repeat cleanliness check 5 1 3 Cleaning Ball and Nozzle AMETEK recommends cleaning the ceramic ball and nozzle with a residue free solvent Using a cottom swab or soft cloth with a solvent such as alcohol wipe the inside of the nozzle Dampen a clean cloth with alcohol or other residue resistant solvent and clean the ceramic ball by rotating it within the cloth After the ball and nozzle have been cleaned slide the ball through the nozzle The ball should pass through the nozzle with no resistance 16 5 1 4 Ball amp Nozzle Reassembly After ensuring that both the ceramic ball and nozzle are clean reassembly by first placing the nozzle back into proper position and alignment Always make sure that the serial number on the nozzle is directly above the serial number of the nozzle body CORRECT ALIGNMENT The serial number for the nozzle top aligns with the serial number of the nozzle body bottom INCORRECT ALIGNMENT The serial numbers DO NOT align and may lead to inaccurate readings 17 5 2 LEVELING THE TESTER For proper operation the PK II tester should be placed on a support that is solid and free from vibration 5 2 1 Coarse Leveling Both coarse and fine leveling are supported by the PK II tester Coa
7. SS 0 01 and 0 02 Bar 1 1 2 1 2 1 3 Part Number K 2047 17 K 2047 18 K 1294 2 K 2046 29 K 2030 1 K 2031 3 K 2039 12 Table 2g Pressure in Millimeters of Mercury Hg WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL mm Hg 5 mm Hg 10 mm Hg 20 mm Hg 50 mm Hg 100 mm Hg PK2 MED 10 mm Hg 1 2 2 1 2 Part Number K 2047 23 K 2047 22 K 2046 25 K 2046 21 K 2012 1 14 5 0 ASSEMBLY AND SETUP 5 1 BALL AND NOZZLE You should routinely check the ceramic ball and the nozzle for cleanliness Never scrape the nozzle or its associated parts with a hard object or anything that is abrasive or that may remove material from the parts AMETEK recommends that the ceramic ball and nozzle be kept in place at all times except when cleaning is required This will prevent dirt from entering the ball and nozzle assembly 5 1 1 Removing Ceramic Ball Cup one hand over the top beveled end of the nozzle and push from the bottom of the nozzle to remove the ball If the ball tends to stick when being removed DO NOT FORCE IT Forcing the ball may cause serious dam age to the nozzle 5 1 2 Removing the Nozzle Carefully remove the nozzle by pulling the nozzle upward while twisting to overcome the friction of the O ring seal Carefully lift the ceramic ball from the nozzle assembly and store in a secure location Grasp the nozzle firmly and pull upward with a slight twisting motion 15
8. so as to apply a pressure indicating instrument and then turn off the tester output valve If the pressure indicated by the instrument being calibrated holds it is safe to assume their are no leaks If however the pressure decreases there is likely a leak in the calibration system You must locate and fix the leak before calibration can take place Under no circumstances should mercury or corrosive fluids be permitted into the tester When the tester is used in connection with an instrument or pressure system that contains a liquid a suitable safeguard such as a trap or float type manometer check valve should be installed in the tester output line to prevent fouling of tester components Connect clean dry and oil free air or nitrogen to the INLET valve Connect instrument to be tested to the OUTLET valve 19 6 0 OPERATING INSTRUCTIONS The following steps are provided to guide the user through a typical calibration using the PK II tester Step 1 Slip the weight carrier over the ceramic ball Step 2 Admit the supply pressure to the tester by turning on the valve marked INLET WARNING NEVER connect the PK II tester to a high pressure source Applying high pressure may result in personal injury and damage to the tester NEVER apply a pressure greater than 100 PSIG Step 3 Add weights as required Exercise caution when handling the weights Handle only one weight at a time to avoid damaging the weights Slide t
9. 25 gm cm2 Table 2c PK2 2010GM SS 10 2000 gm cm2 5 gm cm2 Table 2c PK2 200N SS 2 200 KPa 2 KPa Table 2d PK2 201N SS 1 200 KPa 0 5 KPa Table 2d PK2 500CM SS 10 500 cm H2O 10cm H2O Table 2e PK2 100CM SS 10 1000 cm H2O 10 cm H2O Table 2e PK2 1500CM SS 10 1500 cm H2O 10 cm H2O Table 2e PK2 2000CM SS 10 2000 cm H2O 10 cm H2O Table 2e PK2 2B SS 0 02 2 bar 0 02 bar Table 2f PK2 SB 01 SS 0 01 2 bar 0 005 bar Table 2f PK2 MEDICAL 10 325 mm Hg 5 mm Hg Table 2g WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL PSIG 1 PSI 2 PSI 3 PSI 5 PSI PK2 20SS 1 2 1 3 PK2 30SS 1 2 1 5 Part Number K 2000 PK2 20 PK2 30 K 2011 K 2012 K 2013 K 2013 5 Table 2a Pressure in PSIG 11 Table 2b Pressure in Inches of Water 20 C WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL in H2O 1 H2O 2 H2O 5 H2O 10 H2O 20 H2O 50 H2O 100 H2O PK2 104WC SS 4 H2O 1 4 9 11 PK2 254WC SS 4 H2O 1 2 1 2 1 2 1 PK2 304WC SS 4 H2O 1 2 1 2 1 1 2 PK2 654WC SS 4 and 10 H2O 1 2 1 2 1 2 5 PK2 854WC SS 4 and 10 H2O 1 2 1 2 1 2 7 Part Number K 1279 4 H2O K 1265 1 10 H2O K 1277 K 1278 K 2047 1 K 1294 K 2046 16 K 2030 K 2031 Table 2c Pressure in Grams per Square Centimeter g cm2 WEIGHT CARRIER Weights Furnished per Pressure Incremen
10. UCT FEATURES The key features of the PK II Pneumatic Deadweight Tester are Accuracy up to 0 015 of indicated reading Floating ball operation eliminates need to rotate weights during testing Self regulating input air flow maintains ball and weights in a float position and compen sates for variations in air supply pressure Rugged ceramic measuring ball withstands harsh environments and field use Monocontaminating fluid eliminates the need to clean instruments after calibration or before use Close cover operation eliminates wind effects in field calibrations Multi position ball valves for both the inlet and outlet connections ensures trouble free operation Certificate of Accuracy and Traceability available with area mass and intrinsic correc tion factors Rugged aluminum housing offers long life Top Front housing is reversible 5 1 2 PK II PHYSICAL DIMENSIONS Figure 1 1 PK II Dimensions Models 104 254 304 and Medical 8 875 in 225 4 mm 12 75 in 323 85 mm 3 0 in 76 2 mm 6 125 in 155 56 mm 6 1 2 PK II PHYSICAL DIMENSIONS Figure 1 2 PK II Dimensions Models 20SS 30SS 654 854 2000GM 2010GM 200N 201N 500CM 1000CM 1500CM 2000CM 2B 2B01 12 75 in 323 85 mm 12 875 in 327 03 mm 8 0 in 203 2 mm 7 2 0 CORRECTION FACTORS An error in pressure determinations may result from any uncertainty of the mass of the loading weights and from the measurement of the
11. be wiped clean with a lint free cloth and placed within the groove in the nozzle body DO NOT LUBRICATE THE O RING WITH ANY FORM OF OIL OR GREASE Clean the ball and nozzle as described in Section 5 1 3 Cleaning the Ball and Nozzle and reassemble 27 9 0 PARTS LIST PART NUMBER DESCRIPTION K 1035 Nameplate K 1048 Nozzle Body Restriction Screw K 1050 ETCH Nozzle 10 90013 Nozzle O Ring K 1051 Ceramic Ball K 1182 Spring K 1193 Retainer K 1209 Regulator Nozzle Block K 1212 Disc Clip and Diaphragm Assembly K 1216 Regulator Ratio Disc Diaphragm Stem Side K 1217 Regulator Ratio Disc Diaphragm Flat K 1223 Gasket K 1224 Regulator Assembly Screw K 1246 Bulls Eye Level K 1273 Label Inlet Outlet Caution K 1297 Capacity Tank Assembly K 1303 Nozzle Body Restriction Assembly K 1831 Tripod Mounting Plate K 1832 Level Adjust Stud K 1833 Level Retainer Stud K 1834 Leveling Foot K 1835 Leveling Foot Assembly K 1836 Aluminum Adjusting Nut 3 8 24 K 1839 Nut 5 8 18 x 1 8 K 1840 Regulator Assembly K 1850 Filter Assembly K 1868 ASSY Internal Cover Assembly Small Case K 1896 ASSY Internal Cover Assembly Large Case K 1880 Regulator Bracket K 1882 Weight Retainer Block 03 90020 Screw 2 56 x 5 16 04 90047 Nut 7 16 20 06 90040 Brass Washer 0 74 OD 12 90040 1 8 NPT x 1 8 Tube Straight Connector 11 90062 Bulk
12. ctive area and force weight mass Instruments not sent to AMETEK as a system can only be provided with certifications on the parameter calibrated e g effec tive area or mass All materials should be securely packaged to prevent damage during transportation and handling Testers should be returned in their case The ball nozzle assembly should be wrapped with adequate padding material and well secured to avoid shifting movement and to protect them from shock during transportation 10 4 0 SPECIFICATIONS The PK II Pneumatic Deadweight Testers are self regulating primary standards with a pressure capacity of 104 254 304 and 854 inches H2O These instruments operate on the deadweight principle using only fundamental units of force and area Pressure equals the weight force divided by the effective area of the ball All PK II Testers are shipped with tester and weight contained within a carrying case The instrument is available with accuracies of 0 015 0 025 or 0 05 of indicated read ing with stainless steel weights MINIMUM WEIGHT MODEL RANGE INCREMENT SET PK2 20SS 1 20 PSIG 1 PSIG Table 2a PK2 30SS 1 30 PSIG 1 PSIG Table 2a PK2 104WC SS 4 100 H2O 1 H2O Table 2b PK2 254WC SS 4 254 H2O 1 H2O Table 2b PK2 304WC SS 4 304 H2O 1 H2O Table 2b PK2 654WC SS 4 654 H2O 1 H2O Table 2b PK2 854WC SS 4 854 H2O 1 H2O Table 2b PK2 2000GM SS 25 2000 gm cm2
13. effective area of the ball and nozzle Other sources of error however may not be easily recognized Other sources of error include the air buoyancy of the weights gravity thermal expansion and elastic deformation of the ball and nozzle and the air heads involved All of these corrections with the exception of local gravity except when specified thermal expansion and air heads have been corrected for by AMETEK prior to the tester being shipped The following technique is suggested to compute the corrected tester output pressure readings Gravity Local gravity values differ depending upon geographic locations Pressure is defined as force per unit area so that mass values must be converted to force values To accomplish this the acceleration of gravity must be used The acceleration of local gravity may be determined by having a gravitational survey made of the local area with a gravimeter or by contacting various governing bodies such as the National Oceanic and Atmospheric Admin istration U S Department of Commerce Once the local value of gravity is known the pressure may be corrected using the following formula Where P G tester output pressure corrected only for gravity G local gravity G W gravity value for which the tester is calibrated P N pressure value of weights applied PG GW x PN G 8 Temperature If the coefficient of expansion of the ball and nozzle is positive the effect
14. he United States of America to reference masters calibrated by the National Institute of Standards and Technology NIST Measurement performance is affected by the frequency and severity of use the environ ment test conditions and by other factors AMETEK recommends calibration on a pre scribed interval frequency in order to ensure optimal measurement performance and reli ability Two types of calibration services are offered Calibration with a Certificate of Conformance Certificate of Compliance A statement of conformity which documents that the listed device s conforms to pub lished specifications or the terms of the order contract It can provide in addition a statement of traceability to NIST Calibration with a Calibration Report Certificate A report that outlines detailed information about the calibration process This includes actual calibration data traceability information test conditions and other factors as may be applicable to the type of device being calibrated 3 1 RECOMMENDED CALIBRATION FREQUENCY As a general rule AMETEK pneumatic testers should be tested and recertified every 12 months Testers used on a more frequent basis should be tested more frequently 3 2 MATERIALS NECESSARY FOR RECERTIFICATION Both the tester assembly and weight set should be returned to AMETEK in order to allow for calibration of the tester as a system Pressure is a derived parameter requiring determina tions of both effe
15. he weight carrier over the ball and nozzle assembly Open the INLET valve and supply pressure to the tester Add the required weights by sliding the weights over the carrier Apply the heavier weights first Always store the weights in the compartment provided in the PK II tester case 20 Step 4 Weights may be given a slow rotary motion to ensure that the weights rotate freely without abrupt stopping See Section 6 1 to correct for poor weight rotation Note It is not necessary to excessively spin the weights of the pneumatic deadweight tester to overcome friction Excessive rotation may affect accuracy WARNING Do NOT spin the weights unless the ceramic ball is floating Step 5 Open the tester OUTLET valve and calibrate the instrument Once calibration is complete the downstream pressure may be vented by turning the outlet valve to the VENT position CAUTION The ceramic ball weight carrier and weights comprise a system for your PK II calibrator and should be used together to ensure a correct calibration Accuracy will be affected if the ceramic ball weight carrier and weights are interchanged 6 0 OPERATING INSTRUCTIONS Cont d Slowly rotate the weights to ensure that there are no restrictions and that the weights float freely Open the OUTLET valve to calibrate the instrument Once the calibration is completed you may vent the pressure by rotating the OUTLET knob to the VENT position
16. head Fitting 13 90003 Outlet Valve 13 90022 Inlet Valve 28 AMETEK is a registered trademark of AMETEK Inc Pub No FORM 85 02 Rev 6 Issued 06 99 Printed in U S A Information within this document is subject to change without notice CALIBRATION INSTRUMENTS Internet Addresses www ametek com Copyright 1999 by AMETEK Inc ISO 9001 Manufacturer AMETEK Test and Calibration Instruments 8600 Somerset Drive Largo Florida 33773 Tel 1 727 536 7831 Tel 1 800 527 9999 Fax 1 727 539 6882 AMETEK Precision Instruments Europe GmbH Rudolf Diesel Strasse 16 D 40670 Meerbusch Germany Tel 49 2159 9136 0 Fax 49 2159 9136 39 AMETEK Singapore Pvt Ltd 10 Ang Mo Kio Street 65 05 12 TECHPOINT Singapore 569059 Tel 65 484 2388 Fax 65 481 6588 AMETEK Denmark A S Gydevang 32 34 DK 3450 Allerod Denmark Tel 45 4816 8000 Fax 45 4816 8080
17. is seriously undermined by leaks in the output connections and or instrument being calibrated The following procedures are recommended to isolate and correct for leakage 8 2 1 Output Connection Leaks Load the tester so as to apply a pressure to the instrument being calibrated Close turn OFF the OUTLET valve If the pressure indi cated by the instrument being calibrated re mains constant holds at the indicated pres sure it is safe to assume there are no leaks in the output system between the tester and the instrument 26 8 2 2 Internal Leaks You can perform a check for internal leaks with the input pressure applied and with the cover plate off Step 1 Place full range of weights onto tester Step 2 Turn OFF Close the OUTPUT valve Step 3 Apply liquid leak detector to all internal fit tings from the input connection to the output valve Step 4 Check for leaks by the presence of bubbles on joints Step 5 If a leak is found the PK II Tester must be returned to AMETEK for repair WARNING Leak checks should be done in the order described above otherwise the source of the leak may not be accurately identified CAUTION DO NOT ATTEMPT TO REPAIR INTERNAL LEAKS Return the PK II tester to AMETEK for internal leak repairs Failure to do so may void product warranty 8 3 REPLACING THE NOZZLE AND O RING Remove the ball and nozzle and the nozzle O ring 10 90013 The replacement O ring should
18. ive area will increase with increasing temperature resulting in a corresponding decrease in pressure Corrections can be made using the following formula Where P G tester output pressure corrected only for gravity P T tester output pressure corrected for gravity and temperature T ambient temperature C Air Head When pressurized a correction is required only when the gauge height or reference plane of the unit being calibrated is either higher or lower than that of the pneumatic tester The reference plane of the tester is at the top of the nozzle Heights above the reference plane are negative while heights below the reference plane are positive Corrections can be made using the following formula Where H air head Inches P T tester output pressure corrected for gravity and temperature P A tester output pressure corrected for gravity temperature and air head PT PG 1 1 67 x 10 5 T 23 C PA PT 1 H x 2 84 x 10 6 9 3 0 CALIBRATION AND RECERTIFICATION The accuracy of measurements can only be ensured through calibration against reference standards of a known and well characterized measurement uncertainty reference stan dards that are ultimately traceable through a national standards laboratory to the Interna tional Bureau of Weights and Measures BIPM to a natural physical constant or to consen sus standards All AMETEK pressure calibrations are traceable in t
19. rse leveling to raise the tester is achieved by pushing the knurled rod located inside the case on either side of the weight insert and rotating the knurled nut until it contacts the bottom of the case 5 2 2 Fine Leveling Fine leveling is obtained by rotating the knurled rod clockwise to raise and counter clockwise to lower the tester A third adjustable foot is located under the PK II case between the inlet and outlet valves A bull s eye level is located on the cover plate for sighting level accuracy For coarse adjustment use the knurled rod located on the top For fine adjustment hold the bottom foot and rotate the knurled knob at the top 18 5 3 CONNECTION Connect a supply of clean dry and oil free air or nitrogen to the connection below the valve marked INLET CAUTION The use of other gases will result in an incorrect reading Always use clean dry and oil free air or nitrogen When using the tester thru full range regulate the supply pressure at 30 PSIG minimum however take care NOT TO REGULATE THE SUPPLY PRESSURE OVER 100 PSIG WARNING Do not regulate the supply pressure over 100 PSIG Connect the instrument to be tested to the valve marked OUTLET The tester s input and output connections are 1 4 inch male tube fittings The accuracy of the tester is seriously undermined by leaks in the output connections and or the instrument being calibrated To check for leaks load the tester
20. t MODEL AND BALL g cm2 5g cm2 10g cm2 25g cm2 50g cm2 100g cm2 200g cm2 500g cm2 PK2 2000GM SS 25g cm2 1 1 2 1 3 PK2 2010GM SS 25 and 10g cm2 1 2 1 1 2 1 3 Part Number K 1279 4 10g cm2 K 1265 13 25g cm2 K 2047 33 K 2047 32 K 2046 30 K 2046 19 K 2030 5 K 2039 14 K 2039 11 NOTE 1 Weight insert accepts optional 100 H2O weight 12 Table 2d Pressure in Kilopascals KPa WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL KPa 0 5 KPa 1 KPa 2 KPa 4 KPa 10 KPa 20 KPa 50 KPa PK2 200N SS 2 KPa 2 1 2 1 3 PK2 201N SS 2 KPa amp 1 KPa 1 1 2 1 2 1 3 Part Number K 1279 2 1KPa K 1265 12 2 KPa K 2047 17 K 2047 18 K 1294 2 K 2046 29 K 2030 1 K 2031 3 K 2039 12 Table 2e Pressure in Centimeters of Water 20 C WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL cm H2O 10cm H2O 20cm H2O 50cm H2O 100cm H2O 200cm H2O 500cm H2O PK2 500CM SS 10 cm H2O 1 2 1 2 1 PK2 1000CM SS 10 cm H2O 1 2 1 2 1 1 PK2 1500CM SS 10 and 25 cm H2O 1 2 1 2 1 2 PK2 2000CM SS 10 and 25 cm H2O 1 2 1 2 1 3 Part Number K 2047 24 K 2045 10 K 2046 24 K 2031 18 K 2031 19 K 2031 20 13 Table 2f Pressure in Bar WEIGHT CARRIER Weights Furnished per Pressure Increment MODEL AND BALL Bar 0 005 bar 0 01 Bar 0 02 Bar 0 04 Bar 0 1 Bar 0 2 Bar 0 5 Bar PK2 2B SS 0 02 Bar 2 1 2 1 3 PK2 01
21. ufacturing defect is found AMETEK will replace or repair the instrument or replace any defective part thereof without charge however AMETEK s obligation hereunder does not include the cost of transportation which must be borne by the customer AMETEK assumes no responsibility for damage in transit and any claims for such damage should be presented to the carrier by the purchaser 4 1 0 INTRODUCTION AND PRODUCT OVERVIEW The AMETEK PK II Pneumatic Deadweight Tester is a primary standard that produces a pressure by applying force weight set over area the ceramic ball and nozzle The PK II tester is NIST traceable and accurate to 0 015 of indicated reading using stainless steel weights calibrated to international standard gravity at 980 665cm sec2 The unit is intended for low pressure applications up to 30 PSIG 2 bar The PK II tester may also be calibrated to the user s local gravity or to inches or centimeters of H2O at 20 C per ISA recommended practices or to reference water columns at 60 F per AGA standard practices The PK II tester is self regulating with accuracy independent of the operator The tester utilizes a frictionless ceramic ball which floats on a layer of air within a stainless steel cylinder The PK II tester features a sturdy cast metal base with integral quick leveling system for field or laboratory use The case also contains a tripod fixture allowing the unit to be tripod mounted in the field 1 1 PROD
22. ut restriction using a 1 32 drill or piece of 22 gauge wire to clean out any obstructions Step 13 Clean the ceramic ball nozzle and body thor oughly 24 7 2 INPUT SYSTEM The PK II tester features an input filter located within the 1 4 male tube fitting on the outside of the PK II tester case As this filter becomes dirty the tester may react by not supporting the weights To correct remove the filter and examine the NPT opening for any contamina tion CLEANING THE INPUT FILTER Remove the input filter fitting and clean it by backflushing from the downstream end with clean compressed air If an ultrasonic cleaner is available AMETEK recommends that the filter fitting be cleaned using the ul trasonic cleaner for 10 to 15 minutes in a residue free solvent CAUTION Do NOT attempt to remove the filter element from the fitting Filters should be replaced periodically 25 8 0 TROUBLESHOOTING The following represent common troubleshooting tips for the PK II tester 8 1 CORRECTING FOR POOR WEIGHT ROTATION If weights do not rotate freely as described in Section 6 0 Step 4 perform the following Step 1 Check the cleanliness of the ceramic ball and nozzle Step 2 Make sure the tester is level by checking the bull s eye Step 3 Isolate tester from environmental vibrations or relocate tester Step 4 Check for adequate air supply 8 2 OUTPUT AND INTERNAL LEAKAGE The accuracy of the tester
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