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Thermistor Vacuum (Micron) Gauge ?

daman on Tue June 30, 2009 4:58 PM User is offlineView users profile

Has anyone used one of these are they good to have anything i need to know about it,found a used one at a local tool sale today the guy is holding it for me, mine is a little older model looking but the same thing.

stock photo..



-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Edited: Tue June 30, 2009 at 5:01 PM by daman

daman on Tue June 30, 2009 7:02 PM User is offlineView users profile

Nobody has seen/used one??????

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

TRB on Tue June 30, 2009 8:09 PM User is offlineView users profile

We use these in our shop.



-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

daman on Tue June 30, 2009 9:03 PM User is offlineView users profile

Thanks tim,any info at all on this unit? anyboby?

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

SpinRite on Tue June 30, 2009 9:54 PM User is offline

Is this it?

(I hope the thermistor came with it...)

TRB on Tue June 30, 2009 10:02 PM User is offlineView users profile

Mastercool also makes a nice unit also.

Mastercool 98061

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

daman on Wed July 01, 2009 9:40 AM User is offlineView users profile

Quote
Originally posted by: SpinRite
Is this it?



(I hope the thermistor came with it...)
No, it looks just like the one in my pic above...



-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

bohica2xo on Wed July 01, 2009 1:03 PM User is offline

Daman:

If it works at all, it will work fine. Likely the batteries are dead, and will no longer hold a charge after all these years. It should still run ok on 110v.

Assemble it, and try the calibration. The sensor can be cleaned with trichlor or alcohol.

If you can get it cheap & it works, great. You can buy a Supco unit for less than 150 bucks new, and Tim sells some as well. It depends on how cheap you can get that one, and how much you want cordless operation.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

daman on Wed July 01, 2009 2:32 PM User is offlineView users profile

Thanks,gotch ya he's asking under 50,sensor is good,do they go bad with time/use?.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

bohica2xo on Thu July 02, 2009 3:37 AM User is offline

A thermistor is fairly rugged. They do not wear out, but can be damaged. Very strong solvents, or blasting high pressure air through the sensor can do it. Normal use will not "wear" anything.

A thermistor type gauge is basically a resistor under load. At atmospheric pressure, a fixed load on a resistor produces a known ammount of heat. When you remove the atmosphere, the heat no longer has a place to go. As the resistor heats up, the resistance changes. The change in resistance is extrapolated to read vacuum.

The calibration adjustment on your unit is to compensate for things like barometric pressure, ambient temperature.

Contamination with refrigeration or vacuum pump oils will cause a loss of accuracy. The oil transfers the heat from the resistor to the body of the sensor - even in a vacuum.

To clean the sensor, cap one end & pour a bit of solvent in. Hold your thumb over the opening & give it a shake. Pour the solvent out. Alcohol or trichlor work fine for this. R11 was great for cleaning thermistors...

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

daman on Thu July 02, 2009 7:53 AM User is offlineView users profile

Thank you very much bohica2xo!!


-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

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