1430 Microtector - Dwyer Instruments
Contents
1. Differential Pressure Measurement Differential pressures may be measured by connecting the higher more positive pres sure to the left connection Item 2 and the lower pressure to the right connection Item 5 Storage Turn meter circuit switch to off position and withdraw the point well clear of fluid by turn ing micrometer clockwise when gage is not in use This will conserve the batteries and min imize build up of oxides etc on the point Keep the unit covered and in an area free of strong solvent fumes Maintenance When the meter reading becomes reduced or the pointer movement gets sluggish with the circuit on and the point in fluid the following should be done 1 Remove the point by unscrewing and clean the tip lightly using fine crocus cloth Wipe off all grit and dirt with a clean rag reassemble and recheck meter operation Copyright 2009 Dwyer Instruments Inc Printed in U S A 7 09 DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A 2 If the meter operation continues to be Sluggish replace the size AA 1 5 volt battery Replace the battery at least once a year to avoid deterioration of battery and damage to gage Leakproof alkaline battery is recom mended To replace the battery remove center screw Item 10 located in the back of the electronic enclosure Cover Item 9 will come off exposing the battery Pull the old battery out and push a new battery i2. JwY CF Bulletin D 57 Model 1430 Microtector Electronic Point Gage Installation and Operating Instructions Model 1430 Microtector Portable Electronic Point Gage combines mod ern solid state integrated circuit elec tronics with a time proven point gage manometer to provide fast accurate pressure measurements SPECIFICATIONS AND FEATURES e Accurate and repeatable to 00025 inches water column e Pressure range 0 2 w c positive negative or differential pressures e Non toxic and inexpensive gage fluid consists of distilled water mixed with a small amount of fluorescein green color concentrate e Convenient portable lightweight and self contained the unit requires no external power connections and is operated by a 1 5 volt penlight cell e A C detector current eliminates point plating fouling and erosion e Micrometers are manufactured in accor dance with ASME B89 1 13 2001 and are traceable to a standard at the National Institute of Standards and Technology e Three point mounting dual leveling adjustment and circular level vial assure rapid setup e Durablock precision machined acrylic plastic gage body e Sensitive 0 50 microamp D C meter acts as a detector and also indicates battery and probe condition e Heavy 2 thick steel base plate provides steady mounting e Top quality glass epoxy circuit board and solid state integrated circuit electronics Electronic enclosure of
3. nto the battery hold er with the positive center terminal to the right to the end marked with on the holder If the fluid becomes contaminated and requires replacement empty old fluid from gage flush out with clear water and replace with distilled water and A 126 fluorescein green color concentrate mixed with 3 4 oz concentrate to each quart of water CAUTION 1 Do not substitute other gage fluids as proper gage operation depends on use of the specified gage fluid to provide proper surface tension wetting ability and electrolyte capa bility with unity specific gravity If the gage bore is very dirty a mild soap solu tion may be used to aid in cleaning prior to flushing with clear water 2 Do not clean with liquid soaps special sol vent de greasers aromatic hydrocarbons etc Such cleaners and solvents may contain chlorine fluorine acetone and related com pounds that will permanently damage the gage and prevent proper operation FR 38 440190 00 Rev 8 Phone 219 879 8000 Fax 219 872 9057 www dwyer inst com e mail info dwyer inst com
4. ounted point is then lowered until it contacts the manometer gage fluid The instant of con tact is detected by completion of a low power A C circuit Current for this circuit is supplied by a 1 5 volt penlight cell feeding two semi conductor amplifiers which act as a free run ning multivibrator operating at a frequency of approximately two kilohertz Completion of the A C circuit activates a bridge rectifier which provides the signal for indication on a sensitive 0 to 50 microamps D C microam meter On indication of contact the operator stops lowering the point and reads the micrometer which indicates one half the applied pressure By interpolating eight divisions each being 000125 w c between 001 micrometer graduations a total accuracy of 00025 can easily be achieved The micrometer complies with Federal Specification GGG C 105A and is traceable to a master at the NIST Locating and Opening Stand the Microtector Gage and case on a firm flat level surface Remove cover by releasing the latches and lifting it straight up If it is necessary to move the gage without case handle only the base plate or clear acrylic block CAUTION Do not handle gage by grasping meter electronic package hous ing Item 7 on drawing Fluid Level Level the gage by adjusting the two front lev eling screws Item 8 on drawing until the bub ble in the spirit level is centered in the small circle After leveling the gage open both ra
5. pid shut off valve tube connectors Items 2 and 5 Back off the micrometer Item 4 if neces sary to make sure that the point is not immersed in the gage fluid The fluid level in the gage should now coincide with the mark on the right hand bore Item 6 plus or minus approximately 1 32 inch If the level of fluid is too high fluid can be removed with an eye dropper pipette or carefully poured out of the right connection Item 5 If the level is too low remove the top left rapid shut off valve tube connector Item 2 and add distilled water pre mixed with the proper amount of green concentrate See mainte nance instructions for proportions After cor recting the fluid level re install the rapid shut off connectors and with these in the open position re level the Microtector Gage The gage is now ready to be zeroed Zeroing Turn the Micrometer barrel Item 4 until its lower end just coincides with the zero mark on the scale and the zero on the barrel scale coincides with the vertical line on the internal scale Note that the internal scale is graduat ed every 025 from 0 to 1 00 inch and the barrel scale is graduated in one thousandths from 0 to 025 Turn the meter circuit switch at the top of gage to the on position While holding the barrel at the zero position and with gage level raise or lower the point by turning the knurled knob Item 3 until the point is above but near the fluid Check to be su
6. re that the meter registers zero Watch the meter hold the barrel and lower the point slowly by turning the top knurled knob As the knob is turned the point will contact the fluid and the meter pointer will move from zero to some upscale position After making contact turn the point out of the fluid by turning the micrometer barrel counter clockwise to a reading of 010 or more Again watch the meter and this time lower the point by turning the micrometer barrel The point position where the meter pointer begins to move up scale is the zero position This position should correspond to the zero read ing on the micrometer Adjust the point in rela tion to the micrometer barrel by turning the top knob while holding the barrel steady Repeat lowering the point watching the meter for contact and adjusting the point until the zero position and zero reading exact ly coincide The gage is now zeroed and should not be moved An alternative method of zeroing and reading can be used wherein instead of zeroing the gage completely a zero correction reading is taken and recorded then subtracted from the final reading Comparable results can be obtained with either method Positive Pressure Measurement With the fluid at its proper level a pressure of 2 0 water column maximum can be meas ured Positive pressure should be applied to the top left connection Item 2 with the micrometer zeroed as described above This will permit a
7. simple direct reading to be taken After an unknown pressure has been applied at the top left connection the fluid level will drop in the left bore and rise over the point in the right bore Note that the indicating meter point has moved upscale because the point is immersed in the fluid Turn the micrometer counter clockwise until the point leaves the fluid as indicated by the meter pointer drop ping to zero on its scale Then slowly turn the micrometer down until its point just touches the fluid surface causing movement of the meter pointer Withdraw the point and repeat several times noting each time the microme ter reading where the meter pointer begins The average of these readings multiplied by two is the pressure applied to the gage Avg reading x 2 pressure applied in inches w c The degree of uncertainty for the operator is indicated by the difference in these readings When the readings are complete the pres sure should be removed and the zero setting of Microtector Gage rechecked Any change in the zero position will indicate inaccurate readings Should this happen the zero set and pressure measurement procedure should be repeated Negative Pressure or Vacuum Measurement Zero the gage Connect the source of vacu um or negative pressure to the right side gage connection Item 5 and proceed as described under Positive Pressure Measurement section Remember that the pressure measured in this way is negative
8. tough molded styrene acrylonitrile provides maximum protection to components yet allows easy access to battery compartment e Rugged sheet steel cover and carrying case protects the entire unit when not in use Accessories included are 2 3 foot lengths Tygon tubing 2 1 8 pipe thread adapters and 3 4 oz bottle of fluorescein green color concentrate with wetting agent Maximum pressure 100 psig with optional pipe thread connections e Tygon is a registered trademark of Saint Gobain Corporation DWYER INSTRUMENTS INC P O BOX 373 MICHIGAN CITY INDIANA 46361 U S A Phone 219 879 8000 Fax 219 872 9057 www dwyer inst com e mail info dwyer inst com od 0 i U w U Microtector Gage Precision Pressure Measurement The Microtector Gage combines the time proven principles of the Hook Gage type manometer and modern solid state integrat ed circuit electronics It provides an inexpen sive means of achieving accuracy and repeatability within 00025 inches water col umn throughout its 0 to 2 inches w c range It is truly a new standard in precision measur ing devices Principles of Operation A pressure to be measured is applied to the manometer fluid which is displaced in each leg of the manometer by an amount equal to 1 2 the applied pressure A micrometer m
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