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  5. Operating And Service Manual

Keison PFP7 Operating And Service Manual

Manual is about: Flame Photometer

Summary of PFP7

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    Flame photometer models pfp7 and pfp7/c operating and service manual.

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    1 pfp7/rev c/01-08 safety please read this information carefully prior to installing or using this equipment. 1. The unit described in this manual is designed to be operated only by trained personnel. Any adjustments, maintenance and repair must be carried out as defined in this manual by a person q...

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    2 pfp7/rev c/01-08 contents: section 1 ..................................................................................................... 4 introduction...............................................................................................................................4 1.1 instrument d...

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    3 pfp7/rev c/01-08 section 7 ................................................................................................... 25 trouble shooting ....................................................................................................................25 7.1 general .......................

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    4 pfp7/rev c/01-08 section 1 introduction 1.1 instrument description the pfp7 and pfp7/c are low temperature, single channel emission flame photometers designed for the routine determination of sodium (na) and potassium (k). Additional filters are available for the determination of lithium (li), cal...

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    5 pfp7/rev c/01-08 figure 1.2.1: schematic diagram showing the component parts of a flame photometer. The analysis of alkali and alkaline earth metals by flame photometry has two major advantages: i. Their atoms reach the excited state at a temperature lower than that at which most other elements ar...

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    6 pfp7/rev c/01-08 1.3 specification pfp7 pfp7/c ranges: - 120-160 mmol/l na (linearised) 0-10.0 mmol/l k limits of detection: na ≤ 0.2ppm - k ≤ 0.2ppm - li ≤ 0.25ppm li ≤ 0.25ppm ca ≤ 15ppm ca ≤ 15ppm ba ≤ 30ppm ba ≤ 30ppm reproducibility: ≤ 1% coefficient of variation (c.V.) for 20 consecutive sam...

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    7 pfp7/rev c/01-08 section 2 installation 2.1 services required the fuel and air supplies to the instrument must be clean and dry and supply pressures regulated within the limits specified. Any contamination, moisture or variation in supply pressure will directly affect the performance of the instru...

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    8 pfp7/rev c/01-08 2.3 assembly place the instrument on a bench and proceed as follows (see figures 2.3.1 and 2.3.2 below). 1. Take the mixing chamber assembly and ensure that the fluted burner (1) is in place (remove the retaining tape); offer up to the chimney. Look down the chimney and ensure tha...

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    9 pfp7/rev c/01-08 figure 2.3.2: rear panel showing the drain trap, air and fuel tubing. 2.4 installation warning the exhaust gases from the chimney are very hot. No obstruction should be placed above the instrument and the instrument should be located in a position that makes accidental contact wit...

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    10 pfp7/rev c/01-08 suitable plug to the 3-pin ac supply lead. The colours of the wires conform to the internationally recognised standard such that: brown live blue neutral green/yellow earth important – the instrument must be earthed. The green/yellow wire in the ac supply must be connected to a p...

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    11 pfp7/rev c/01-08 section 3 analysis preparation 3.1 calibration standards a comprehensive range of aqueous calibration standards is available from jenway in both industrial and clinical levels. These must be diluted to a suitable concentration for aspiration into the flame (see sections 3.3 and 4...

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    12 pfp7/rev c/01-08 3.1.1 sodium accurately weigh 0.634g of dry “analar” quality nacl, dissolve in pure deionised water and wash into a 500ml volumetric flask. Fill to the mark with pure deionised water. To prepare the standard solution for use with the flame photometer, this stock solution should b...

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    13 pfp7/rev c/01-08 1000ppm ca, then na analysis can only be achieved by removing the ca with oxalate/oxalic acid or ensuring all standards contain 1000ppm ca. 4. Always try to follow a well-documented analytical procedure, which should contain information pertaining to interference removal when app...

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    14 pfp7/rev c/01-08 section 4 operation 4.1 front and rear panel controls 4.1.1 front panel controls figure 4.1.1: front panel power a two-position rocker switch which controls the ac supply of the instrument. Any accessories connected to the auxiliary power out sockets on the rear panel are also co...

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    15 pfp7/rev c/01-08 4.1.2 rear panel controls figure 4.1.2: rear panel voltage selection a two-position switch marked 230 and 115. These positions allow operation from voltage supplies 190-250 volts and 90-125 volts respectively at either 50 or 60hz. Warning: when adjusting the operating voltage it ...

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    16 pfp7/rev c/01-08 4.2 operation 1. Ensure that the drain trap is pushed fully down on its clip. Ensure that the drain trap has solution in it and that no air locks are present. If necessary, purge by adding deionised water and allowing the surplus to run away. 2. Close the fuel valve by turning fu...

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    17 pfp7/rev c/01-08 4.3 calibration: pfp7 it is important to understand that the principles of flame photometry are such that, over certain concentration ranges, light emitted from the flame is directly proportional to the concentration of the species being aspirated. The graph below shows that the ...

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    18 pfp7/rev c/01-08 figure 4.3.2: typical calibration curve measuring ppm. Customers working in medical environments are quite likely to be using the s.I. Unit of mmol/l to report their results. The relationship between mmol/l and ppm is defined below: sodium na 1ppm = 0.0435mmol/l 1mmol/l = 23ppm p...

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    19 pfp7/rev c/01-08 4.4 calibration: pfp7/c when using the pfp7/c, a calibration curve is not required as the display is calibrated in direct concentration units. Therefore only one top standard is required to enable this calibration to be performed . Installation and set-up procedures should be car...

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    20 pfp7/rev c/01-08 4.6 operating precautions 1. The fuel gases used in the flame photometers are inflammable and therefore potentially hazardous. Cylinders of fuel gas should always be stored and used in line with the supplier’s recommendation. 2. It is possible that a small quantity of fuel will e...

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    21 pfp7/rev c/01-08 section 5 accessories 5.1 water separator to avoid unstable readings it is essential that the air supply to the mixing chamber is clean and dry. Jenway recommends that a water separator be used with all flame photometers as when air is compressed, condensation occurs. The amount ...

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    22 pfp7/rev c/01-08 3. Connect the other end of the air tubing to the air inlet located on the rear panel of the pfp7 and secure with a hose clip. 4. Plug the 8515/8516 mains lead into either auxiliary power socket located on the rear panel of the pfp7. 5.3 diluter the diluter is a stand alone dilut...

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    23 pfp7/rev c/01-08 section 6 maintenance 6.1 general the design of the model pfp7 is such that maintenance requirements are minimal. To maintain good performance and prolong the life of the instrument it is important that the procedures defined in the manual are carried out regularly. The performan...

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    24 pfp7/rev c/01-08 6.4 six-monthly maintenance burner cleaning. Equipment required: 10ml graduated measuring cylinder stop watch cleaning wire (500 194) cleaning solution (025 171) small, stiff brush 1. Carry out the weekly maintenance schedule. 2. If the instrument has been running with the flame ...

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    25 pfp7/rev c/01-08 section 7 trouble shooting 7.1 general this section is a step-by step guide that should allow an operator to take appropriate actions to clear simple faults. Any action not defined in this trouble shooting guide should only be undertaken by qualified personnel. 7.2 unstable resul...

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    26 pfp7/rev c/01-08 incorrect filter selected. Select correct filter. Flame temperature not correctly set. Ensure the fuel valve is correctly set for the element being determined, refer to section 4.2. 7.4 non-linear results possible cause solution nebuliser blocked. Check the nebuliser performance ...

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    27 pfp7/rev c/01-08 ac supply not available. Check mains supply. Fuse(s) blown. Check fuses and replace if necessary. Check the setting of the voltage selector. 7.7 no reading on display possible cause solution incorrect filter selected. Select correct filter. Calibration standard incorrectly made. ...

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    28 pfp7/rev c/01-08 section 8 service information 8.1 sample system description figure 8.1.1: sample system the sample is taken up by a concentric type nebuliser unit. Air, at a constant pressure, is passed around the end of a small capillary tube forming a partial vacuum inside the capillary tube a...

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    29 pfp7/rev c/01-08 8.2 combustion and ignition system description figure 8.2.1: combustion and ignition system the pfp7 can be used with propane, butane, natural gas or l.P.G. At pressures as defined in section 2. Immediately behind the rear panel fuel bulkhead is the fuel solenoid valve. This sole...

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    30 pfp7/rev c/01-08 8.3 optical system description light is emitted from the flame and collected by a plano-convex lens mounted on the inner chimney. The wavelength of light reaching the photo-detector is determined by up to 5 different interference filters mounted in a wheel. The filter in the ligh...

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    31 pfp7/rev c/01-08 transistor tr2, which, in turn, switches off transistor tr1 which de-energises the coil of the relay, breaks the relay contacts and removes the +12v supply from the solenoid, hence shutting off any further gas flow. The inputs of ic1 are protected from the high voltage sparks gen...

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    32 pfp7/rev c/01-08 figure 8.4.2: power supply and flame failure detection circuit..

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    33 pfp7/rev c/01-08 8.5 signal processing description refer to figures 8.5.1 and 8.5.2. The signal from the pin (pd1) diode is amplified by ic1, a high input impedance op-amp. The coarse gain control switches 1, 10 and 100 megohm resistors into the feedback to change the gain on the first three rang...

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    34 pfp7/rev c/01-08 figure 8.5.2: main circuit board..

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    35 pfp7/rev c/01-08 section 9 component replacement 9.1 chimney and optical components 9.1.1 mixing chamber dismantling figure 9.1.1: mixing chamber, nebuliser and burner assembly. 1. Ensure power, fuel and air supplies to the instrument are disconnected. 2. Remove the nebuliser (1) by turning the r...

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    36 pfp7/rev c/01-08 figure 9.1.2: mixing chamber, impact bead and impeller assembly. 9.1.2 chimney dismantling 1. Ensure that power, fuel and air supplies to the instrument are disconnected. If the instrument has been running with the flame alight, allow 30 minutes for the burner system to cool down...

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    37 pfp7/rev c/01-08 9.1.3 thermocouple removal 1. Ensure that power is disconnected from the instrument. If the flame has been alight allow 30 minutes for the burner and chimney to cool down. 2. When cool, unscrew the cap that holds the thermocouple in place, taking care not to loosen the housing re...

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    38 pfp7/rev c/01-08 figure 9.1.3: filter wheel and filters. 1: filter wheel; 2: pin diode pcb mounting bracket. 1 2 1 2.

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    39 pfp7/rev c/01-08 9.2 power supply pcb refer to figures 9.2.1 and 9.2.2. Figure 9.2.1: main chassis component locations. 1: power supply pcb; 2: main pcb; 3: ignition spark generator module; 4: air regulator assembly; 5: fuel needle valve assembly. 1. Ensure that power is disconnected from the ins...

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    40 pfp7/rev c/01-08 figure 9.2.2: power supply pcb 9.3 main pcb replacement refer to figures 9.2.1, 9.3.1 and 9.3.2. 1. Ensure that power, fuel and air supplies to the instrument are disconnected. 2. Remove the knob from the front panel d.P., blank, fine and coarse controls by loosening the two grub...

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    41 pfp7/rev c/01-08 figure 9.3.1: main pcb figure 9.3.2: main pcb rear view showing the linearization pcb for the model pfp7/c. 9.4 fuel solenoid replacement refer to figure 9.2.1. 1. Ensure that power, fuel and air supplies to the instrument are disconnected. Remove the top rear cover as described ...

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    42 pfp7/rev c/01-08 3. Identify the cap nut on the compression fitting on the outlet of the solenoid. Loosen this nut and slide it away from the solenoid along the micro-bore copper tubing. Pull the compression fitting out of the solenoid outlet. 4. Remove the nut on the rear panel fuel inlet bulkhe...

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    43 pfp7/rev c/01-08 9.7 air regulator assembly replacement refer to figure 9.2.1. 1. Ensure that power, fuel and air supplies to the instrument are disconnected. Remove the top rear cover as described in section 9.2 step 1. 2. Remove the compression fitting that retains the nylon tube to the outlet ...

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    44 pfp7/rev c/01-08 section 10 spare parts 10.1 minor spares kit (500 172) description part code multi-turn potentiometer 007 034 led double 7 segment display - red 012 004 fuse 250ma (slow blow) 016 005 fuse 3.15a (slow blow) 016 007 fuse 6.3a (quick blow) 016 015 inlet tube (500mm) 500 193 silicon...

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    Thank you for reading this data sheet. For pricing or for further information, please contact us at our uk office, using the details below. Uk office keison products, p.O. Box 2124, chelmsford, essex, cm1 3up, england. Tel: +44 (0) 330 088 0560 fax: +44 (0)1245 808399 email: sales@keison.Co.Uk pleas...