Gunson G4125 Handbook
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Gunson G4125 Handbook

Gas tester, digital exhaust co analyser with pulse pump
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Handbook
G4125
GASTESTER
D D i i g g i i t t a a l l E E x x h h a a u u s s t t C C O O A A n n a a l l y y s s e e r r w w i i t t h h P P u u l l s s e e P P u u m m p p
www.gunson.co.uk

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Summary of Contents for Gunson G4125

  • Page 1 Handbook G4125 GASTESTER D D i i g g i i t t a a l l E E x x h h a a u u s s t t C C O O A A n n a a l l y y s s e e r r w w i i t t h h P P u u l l s s e e P P u u m m p p...

  • Page 3: Table Of Contents

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r GASTESTER Digital Exhaust CO Analyser with Pulse Pump INDEX Page Contents Assembly Descriptions and controls...

  • Page 4: Contents

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r Gastester is an exhaust gas analyzer that works on the “Hot Wire” or “Thermal Conductivity principle.

  • Page 5: Descriptions And Controls

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 3. Descriptions & Controls DISPLAY This is calibrated in volume percent carbon monoxide (CO%) CALIBRATION CONTROL This is used to set the reading of the display to show 2.0% at the start of the tests, before the probe is inserted into the exhaust pipe.

  • Page 6: Instructions For Use

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 5. Instructions for use Ensure that the car is thoroughly warm as mentioned above, that it is parked in a convenient position in the open air, with the handbrake applied.

  • Page 7: Further Information

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 12. If adjustment is required, make a small alteration to the mixture screw, and correct the idle speed by adjusting the idle speed screw (or throttle bypass screw if fitted - see figure 6 &...

  • Page 8: Common Problems

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r If the exhaust pipe has a curved inlet it may be necessary to slightly bend the metal exhaust probe to give better fit.

  • Page 9: Multiple Carburettors

    This can be done using the Gunson’ Carbalancer, or less accurately with a tube to listen to the air intake hiss. Secondly there will be separate mixture adjustments which must be synchronized. In the unlikely event that cylinders fed by each carburettor have totally separate exhaust, CO can be checked in each exhaust to set the respective carburettor.

  • Page 10: Carburettor Adjustments - General Information

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r set the mixture strengths equal at some point, then to ensure that the screws are turned the same amount during subsequent adjustments.
  • Page 11 G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r carburettor. On certain types, the bypass channel may have its own mixture adjustment (shown dotted), for example some Solex EEIT carburettors.

  • Page 12: Single Fixed Venture Type

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 10. Single Fixed Venturi Type This is one of the simpler forms of carburettor with a single air inlet and throttle plate, with a variety of air and petrol metering jets and channels.

  • Page 13: Idle Adjustment

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 12. Idle Adjustment The idle speed screw generally acts on the throttle spindle to which the accelerator linkage is connected: this will give very fine adjustment of the throttle.
  • Page 14 G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r F F i i g g u u r r e e 8 8 GM VARAJET F F i i g g u u r r e e 9 9 PETROL INJECTION SYSTEMS...
  • Page 15 G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r particular models. The illustrations below show examples of types of adjustments. Some older types of system (e.g.
  • Page 16 G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r EXHAUST GAS ANALYSIS Carbon monoxide (chemical symbol CO) is a colorless, odorless, but extremely poisonous gas that is present in the exhaust gas of petrol-engine vehicles.
  • Page 17 G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r dioxide. Some carbon therefore exists in the form of carbon monoxide, and the richer the mixture the more carbon monoxide and the less carbon dioxide there is in the exhaust.

  • Page 18: Technical Specification

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 13. Technical Specification CO Function Calibrated range: 0-10% CO (indicates uncalibrated to 20% C) Accuracy: +/- 0.5% CO Typical (Throughout the indicated range 0.5% CO to 6.5% CO) 14.

  • Page 19: Warranty

    G G u u n n s s o o n n G G a a s s t t e e s s t t e e r r 15. Warranty This warranty is in addition to the statutory rights of the purchaser.The Tool Connection has made every effort to ensure that this product is of the highest quality and value to the customer.

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