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Keison PFP7 Operating And Service Manual

Flame photometer
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Flame Photometer
Models PFP7 and PFP7/C
Operating and Service Manual

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Summary of Contents for Keison PFP7

  • Page 1 Flame Photometer Models PFP7 and PFP7/C Operating and Service Manual...
  • Page 2 The fault condition should be reported immediately to the appropriate servicing authority. In all such reports the serial number of the flame photometer must be quoted. 6. Please read the operating precautions in section 4.6. PFP7/REV C/01-08...

  • Page 3: Table Of Contents

    Sample preparation....................12 Dilution ........................13 SECTION 4 ....................14 Operation..........................14 Front and rear panel controls..................14 Operation ........................16 Calibration: PFP7.......................17 Calibration: PFP7/C ....................19 Shutdown ........................19 Operating precautions....................20 Good practice guidelines ...................20 SECTION 5 ....................21 Accessories ..........................21 Water separator ......................21 Compressor .......................21 Diluter.........................22...
  • Page 4 Main PCB replacement ....................40 Fuel solenoid replacement..................41 Fuel needle valve.......................42 Spark generator replacement ..................42 Air regulator assembly replacement ................43 SECTION 10 ....................44 Spare parts..........................44 10.1 Minor spares kit (500 172) ..................44 10.2 Major spares kit (500 173) ..................44 PFP7/REV C/01-08...

  • Page 5: Section 1

    The model PFP7/C is specifically designed for use in clinical applications. The in-built lineariser circuitry enables readings of both Na and K, at normal clinical serum concentrations to be displayed directly in mmol/l.
  • Page 6 Their characteristic wavelengths are easily isolated from those of most other elements due to wide spectral separation. The analysis of Na, K, Li, Ba and Ca are typically determined at low temperatures, i.e. 1500- 2000° C, therefore suitable fuel mixtures are propane/air, butane/air and natural gas/air. PFP7/REV C/01-08...

  • Page 7: Specification

    Services: Electrical: 90-125V or 190-250V @ 50/60Hz. Air: Moisture and oil-free. 6 litres/minute at 1kg/cm (14psi). Fuel: Propane, butane, natural gas or L.P.G. Operating 15ºC to 35ºC Environment: Size: 420 x 360 x 300mm Weight: PFP7/REV C/01-08...

  • Page 8: Section 2

    Unpacking Remove the instrument from the packaging and ensure the following items are present: Part Code Model PFP7 or PFP7/C Flame photometer Auxiliary power plug 009 035 Mains cable with connector (plug optional as ordered) 013 046...

  • Page 9: Assembly

    Fit the drain trap into the clip on the rear panel and run the short piece of tubing (10) from the bottom of the drain trap to the drain trap outlet (11) on the bottom of the mixing chamber. This tube can be pushed on and does not need securing. PFP7/REV C/01-08...

  • Page 10: Installation

    Turn on the fuel supply at the cylinder or source and check all fuel joints for leaks by using soap solution. 2. Check the position of the voltage selector switch (14) on the rear panel and the value of the fuse FS1. If necessary, adjust to suit your supply voltage. If necessary connect a PFP7/REV C/01-08...

  • Page 11: Accessories

    Propane regulator 500 179 Natural gas regulator 500 180 Water separator (small) 500 176 Water separator (large) 500 177 Dust cover 500 134 Cleaning solution (1 litre) 025 171 Minor spares kit 500 172 Major spares kit 500 173 PFP7/REV C/01-08...

  • Page 12: Section 3

    Below are two examples of how to prepare standards of 1mg Na/100ml (10ppm Na) and 1mg K/100ml (10ppm K). PFP7/REV C/01-08...

  • Page 13: Sample Preparation

    3. Species that cause interference should be removed from samples or the equivalent concentration of the interferant should be present in the standards so as to avoid erroneous results, e.g. if a sample of approximately 10ppm Na contains approximately PFP7/REV C/01-08...

  • Page 14: Dilution

    Good quality deionised water should normally be used for carrying out these dilutions and it is recommended that the same batch of water should be used for diluting the samples and standards. More information on typical dilution ratios is given in Section 4.3. PFP7/REV C/01-08...

  • Page 15: Section 4

    A five position control which will select the appropriate optical filter for the element being determined. NOTE: positions 1, 2 and 3 will normally be blank unless optional filters (Ca, Ba or Li respectively) have been fitted. PFP7/REV C/01-08...
  • Page 16 Two fuses are fitted to the instrument. FS1 is the primary fuse provided to give protection to the instrument and any accessories connected to the power out sockets. FS2 is to protect the electronic circuitry in the PFP7. Both FS1 and FS2 should be of an anti-surge type.

  • Page 17: Operation

    During this warm-up period a blank deionised water sample should be aspirated. It should be noted that results, adequate for most purposes, can be obtained from switch on, although standardisation settings will need frequent checking during the warm-up period. PFP7/REV C/01-08...

  • Page 18: Calibration: Pfp7

    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 direct relationship between the flame emission and concentration is only true at relatively low concentrations.
  • Page 19 5. Calibration needs to be checked periodically by aspirating the blank and standard solutions. Initially this check should be carried out after every 10 samples. Experience and increased confidence in the PFP7 will enable you to best judge the frequency of this check.

  • Page 20: Calibration: Pfp7/C

    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 carried out as for the standard Model PFP7.

  • Page 21: Operating Precautions

    6. Always use recommended spares. Even where an alternative part may be obviously suitable there may be good reasons for not using it. 7. Never use glass containers to store calibration standards. Triton X-100 is a registered trademark of Union Carbide Chemicals and Plastics Co. Inc. PFP7/REV C/01-08...

  • Page 22: Section 5

    110V, 60Hz 5.2.2 Installation The compressor should be positioned on a stable surface within 2 metres of the PFP7. Connection to the PFP7 should be carried out as follows: 1. Ensure the power supply to the PFP7 is switched off.

  • Page 23: Diluter

    PC (desktop or laptop) and requires no power supply. Replacing costly chart recorders, the datalogger enables data acquisition and printing from all PFP7 models. The PicoLog software can collect data at rates from once per hour to 1000 per second and up to 1 million samples can be collected.

  • Page 24: Maintenance

    Maintenance 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 performance of the instrument depends upon an adequate supply of compressed air.

  • Page 25: Six-Monthly Maintenance

    If deposits are persistent, heating or boiling the deionised water will help. 6. Replace the burner, pointed end downwards and re-assemble the mixing chamber onto the chimney. 7. Carry out the flushing procedure as described in Monthly maintenance. PFP7/REV C/01-08...

  • Page 26: Section 7

    Calibration standard at incorrect Make new standards to check the calibration concentration or incorrectly diluted. procedure. Blank calibration standard Re-make standard and re-set blank. contaminated or incorrectly set. Nebuliser blocked. Check the nebuliser performance as defined in Section 6.2, Weekly maintenance. PFP7/REV C/01-08...

  • Page 27: Non-Linear Results

    Reposition the sensor. Ignition electrode worn or bent. Straighten electrode or replace with a new part set to the correct length. No electrical power Possible cause Solution AC supply not fully engaged. Check the power lead is correctly inserted. PFP7/REV C/01-08...

  • Page 28: No Reading On Display

    Burner encrusted with salt. Clean the burner as defined in Section 6.4, Six monthly maintenance. Ensure that the cleaning procedure is carried out more frequently. Ignition electrode encrusted with salt. Clean or replace the ignition electrode as detailed in Section 9.1.2. PFP7/REV C/01-08...

  • Page 29: Section 8

    The remaining sample, consisting of only the smallest droplets mixed uniformly with the fuel, reaches the modified Meker type burner where the mixture burns in a tall, round flame situated in a double skin chimney. PFP7/REV C/01-08...

  • Page 30: 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 solenoid valve is normally closed when there is no power to the instrument or where there is power to the instrument but the flame is not alight.

  • Page 31: Optical System Description

    +12V supply on the solenoid. If the flame should be extinguished the thermocouple cools down and the voltage on the inverting input IC1 decreases. When the level falls below that set by RV8 on the non-inverting input to IC1 the output goes back to +4.5V approx., turning on PFP7/REV C/01-08...
  • Page 32 Back E.M.F.s generated by the coils in the relay and solenoid are dissipated by diodes D3 and The collector of TR1 is taken to the main PCB to activate the FLM indicator when the flame has been detected by the above circuitry. Figure 8.4.1: Power supply and flame failure detection printed circuit board layout. PFP7/REV C/01-08...
  • Page 33 Figure 8.4.2: Power supply and flame failure detection circuit. PFP7/REV C/01-08...

  • Page 34: Signal Processing Description

    RV5) to give a buffered recorder output of 1mV per digit on ranges 1, 2 and 3 and 0.1mV per digit on range 4. The preferred decimal point may be selected by SW2 which connects the relevant decimal point to 0V through a 560 ohm resistor, R16, R17 or R18. Figure 8.5.1: Main circuit board layout. PFP7/REV C/01-08...
  • Page 35 Figure 8.5.2: Main circuit board. PFP7/REV C/01-08...

  • Page 36: Component Replacement

    Re-assembly is the reverse of dismantling and the end cap and rear plate retaining screws must be securely tightened to give gas tight seals. 6. Ensure that when re-assembling the mixing chamber that the baffles are positioned at 45 degrees to each other, as shown in Figure 9.1.2. PFP7/REV C/01-08...
  • Page 37 Replace with a new electrode setting the protruding length to 10mm before retightening the grub screw and re-sealing with plasticine. The plasticine also acts as an insulator so the spark does not jump from the grub screw to the inner chimney. PFP7/REV C/01-08...
  • Page 38 3. Replacement is the reverse of removal. Check that the diode is aligned with the optical path on re-assembly as described in section 9.1.4 PFP7/REV C/01-08...
  • Page 39 Figure 9.1.3: Filter wheel and filters. 1: filter wheel; 2: PIN diode PCB mounting bracket. PFP7/REV C/01-08...

  • Page 40: Power Supply Pcb

    4. The easiest way to remove the PCB is by undoing the four screws from underneath the instrument, leaving the pillars screwed to the PCB. The power supply PCB can now be lifted out of the instrument. Replacement is the reverse of removal. PFP7/REV C/01-08...

  • Page 41: Main Pcb Replacement

    5. The PCB may be removed by tipping it back, releasing the front panel switch bosses from their mounting holes and lifting the PCB back and up through the rear top cover. Take care not to loose or disturb the washers on the switches. Replacement is the reverse of removal. PFP7/REV C/01-08...

  • Page 42: Fuel Solenoid Replacement

    Figure 9.3.1: Main PCB Figure 9.3.2: Main PCB rear view showing the linearization PCB for the model PFP7/C. 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 in Section 9.2 step 1.

  • Page 43: Fuel Needle Valve

    M3 nuts and associated washers that retain the unit to the chimney corner. 3. Remove the switched line and neutral connections from the base of the module that can now be removed from the instrument. Replacement is the reverse of removal. Ensure correct polarity of all wires when reconnecting. PFP7/REV C/01-08...

  • Page 44: Air Regulator Assembly Replacement

    Replacement is the reverse of removal. 4. Check that no air leaks are present and that the gauge can be set to 12psi with the nebuliser connected. PFP7/REV C/01-08...

  • Page 45: Section 10

    Display PCB assembly 500 104 Power supply PCB assembly 500 106 Solenoid valve assembly 500 107 Electronic ignition unit 500 115 Sodium filter 500 123 Potassium filter 500 124 Universal joint 500 141 8515/8516 compressor inlet filter 535 008 PFP7/REV C/01-08...
  • Page 46 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...

This manual is also suitable for:

Pfp7/c

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