cummins coolant temperature sensor

Aren't RTDs essentially linear?

Tornado, Thanks for your reply No,it is not linear, at ambient temp(25 C) it has a resistance of 1000 ohm this leads me to think it is a PT1000, but it was not. I am in a desert site with no access to any means to take measurement to calibrate Thanks

I don't know what Cummins uses, so I was just keying off the 1000 Ω. I think thermocouples are linear too (or at least fairly so), but they are based on millivoltage rather than resistance. Maybe what you have is a thermistor, which is not linear. [?]

If you have a fairly accurate thermometer and a decent multimeter, you might be able to take some sample readings and construct empirically what the curve is. I don't know whether that will help much, but it's the best I can think of so far.

There is yet another type of device, an ICTD (integrated circuit temperature detector) that I am not familiar with at all, other than the name.

This is the only solution I thought of also, but it is not easy where I am, I am somewhere in Iraq. As I Know there is two curves for PT1000, one as per IEC ( European) and one as per NEC (US), well, it is not an IEC PT1000, have you an idea what a NEC PT1000 looks like? Thanks anyway

In general terms, modern coolant temp regulation is mostly accomplished by a variable resistance thermistor that changes resistance as the engine's coolant temperature changes. The sensor's output is monitored by the engine computer to regulate various ignition, fuel and emission control functions, and to turn the radiator-cooling fan on and off as needed. In the PTC (Positive Temperature Coefficient) type of sensor, ohms go up with temperature. In the more common NTC (Negative Temperature Coefficient) type, resistance goes down as heat goes up. To get the specification parameters of the sensor you have in mind, you must supply the type of sensor, name of manufacturer and model number. The type of engine is not important, as quite a few engine models can use the same coolant sensor.

Alex Thanks for your reply This engine is in a critical site somewhere in iraqi desert, i just had a problem with the engine computer, I arrange to make it run with another controller from another engine, different brand, it happened that we have it on site, fuel ignition and other engine functions are working with this new controller, but protection is not working as sensors on cummins engine are not compatible with the new controller, i cannot remove the sensor to make measurement on it to build its curve and program the controller accordingly because this will stop the engine for long time, My question is, if someone know the type of sensors used on this cummins KTA50-G3 engine, as i don't have the type neither the manufacturer nor the part number of the sensor. All I knew About it, it is 1000 ohm at 25 deg C, PTC, not a PT1000 I think I will have to stop the engine and make measurement on the sensor to get its temperature coefficient, the fastest way to have spare parts on site is 10 days THANKS FOR YOUR HELP

Supplier seems to be: Chongqing Head Automatization Co., Ltd. Site shows it to be a resistive sensor with switching transducer output.

It's I again. For thermistor curves, click URL below. Good luck... http://mcshaneinc.com/html/Library_ThermistorCurves.html

I am located within a mile of Cummins Manufacturing and will try and find out for you tomorrow, Monday.

I will try and get you info tomorrow, Monday, however, you might try Customer Assistance at Cummins.com

Thank you very much, I Appreciate

Trying to get you info. Taking time. So far what I have is very limited info and may not be correct. A Cummins contact says part number is: 3025237. Researching that on the web brings up DATCON which is in China. Their web site shows they make Cummins oil and temp sensors. You might try contacting them via the website. I googled: Cummins part number 3015237 and got above info.

Thank you very much this was very helpful

Hi I use to make temperature sensors for Cummins truck engine . Contact a company call Hi Stat Manufacturing in the states and give them the engine number or contact Cummins and ask them for the information you need. This information is supplied to them as they need it to supply the correct codes to the controlling computer . Most of the sensors were NTC thermistors . Epcos thermistor manufacturer is another source you can contact

Hello,

I believe it too late to reply to this thread.. anyways.. if you need any help with sensors or switches or any parts for Cummins you can email me regards

Rohit Madaan, Snark Power Pvt Ltd (www.snarkpower.com)

CR4 Admin - email address removed

From the Site FAQ: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers posted in threads or comments, and we strongly urge you not to put up email addresses. You can share this information via the CR4 internal messaging system.