RunRyder - Carbsmart Sensor

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Radio - Servo - Gyro - Gov - Batt > Carbsmart Sensor

nivlek
Elite Veteran
Location: Norfolk England

They have a thermal time constant of 7 sec , do you think that is fast enough ? I have my doubts .

At the end of the day , it gets dark .

04-25-2008 11:32 PM

dangtsi
Senior Heliman
Location: Hockley, Texas, Waller

Since my CarbSmart was always towards the rich side even though my
engine temperature was actually below 100C I had been corresponding
back and forth with the folks at CSM. They sent me the following information.

Carbsmart temperature sensor resistance vs temperature

Temp. Resistance Approx rate of change
(deg. C) (k ohm) (k ohms/ deg.C)
10 213 10
20 127 6
30 79 3.5
40 50 2
50 33 1.3
60 22 0.8
70 15.4 0.5
80 10.8 0.35
90 7.8 0.24
100 5.7 0.17

Please note that the K ohms per degree changes as the temperature
increases towards operating temperature. I used this information to make two fixed resistance sensors to test my CarbSmart. The closest resistors I had on hand were a 5.63K/100C and a 4.45K/110C. Using the 5.63K/100C with the CarbSmart gain set at about 50 percent the CS positioned the servo at the midpoint. When I changed the CS setting to the 110C setting the CS moved to the full lean position. Then I change to the 90C setting and the CS moved to the full rich position. Using the 4.45K/110C fixed resistance sensor worked the same way with the CS at 50 percent at 110C setting.

This test confirmed my CS was working correctly and that I had a sensor which was not performing to specifications. I had informed Wendy at CSM that I had also had one sensor fail during one tank of fuel. I asked them to look at the pictures of the failed sensor. They stated "We have for some time been potting the sensors within the heatshrink". I hope this will correct the problems related to the sensor failures like many of us have experienced.

I have to say since I have installed the potentiometer in series with
the CS sensor I have had excellent results with the CS. The CS unit
will be at full lean when I start my helicopter. It will move from lean to midscale if I really work the engine and will move to almost full lean when the tank is near empty and working the engine.

Due to the many engine types and sensor mounting configurations I would recommend to someone starting to use the CS for the first time that they also monitor their actual engine temperature. This will confirm the CS is working correctly or alert you to any problems.

The folks at CSM worked with me to confirm my sensor problem. They
welcomed my correspondence with them. I believe they would welcome
anyone to do the same. I wanted to pass the sensor information on to
everyone.

Duane

05-03-2008 02:21 AM

JFERA22
Heliman
Location: MONTEREY,CA

Crap smart sensor design

Are you guys kidding! And your still buying this so called sensor! I would send the whole unit back and get your money back until CSM comes up with a real sensor 1 in 100 will get lucky and work it's got to be the worst way I have seen any kind of sensor mounted! There is so many varilbles that are involved when mounting that inbetween the fins of any motor. espicially on a two stroke what a joke of a design quit wasting you money!! In my opinion

VOOOLAAAREEE~~~ way up in the sky!!

05-03-2008 06:17 AM

andythilo
Senior Heliman
Location: Saffron Walden, Essex, UK

Mines just given up the ghost

, switch on and sensor light comes on and moves to full lean, then it goes out and arm moves back to centre position.

05-09-2008 09:08 PM

holco
Heliman
Location: The Netherlands

Hi Helibalou,

I have two broken sensors

Are the NTSD0WF104FE1B0 sensors a direct replacement??

Regards,

Mario

05-12-2008 12:32 AM

andythilo
Senior Heliman
Location: Saffron Walden, Essex, UK

Well i've ordered 5 of the sensors from RS here in the UK. I'll pull the old one out and if it's in one piece i'll take some measurements.

I will also contact CSM and ask for the actual part no. of the sensor they use to check.

05-12-2008 05:03 AM

helibalou
New Heliman
Location: Euclid, Ohio

holco - Here are the specs.

Everything is the same except for the following.

NCP18WF104103RB(Chip Type) - Perm. Op. Current = .10mA, Typ. Dissipation Constant = 1mW, Thermal Time Constant = ?, Rated Electric Power = 100mW

NTSD0WF104FE1B0(Heavy Duty) - Perm. Op. Current = .14mA, Typ. Dissipation Constant = 1.5mW, Thermal Time Constant = 7sec, Rated Electric Power = 15mW

05-12-2008 08:02 PM

holco
Heliman
Location: The Netherlands

Thanks Helibalou,

I will order some an try them out, no more SC sensors for me!!

The SmartCarb is a perfect device, but the sencor make it a peace off ****!!

Regards,

Mario

05-12-2008 09:39 PM

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Radio - Servo - Gyro - Gov - Batt > Carbsmart Sensor

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