- Yes, in the coffin I saw this automation! - An annoyed colleague in the hearts threw a grimy sensor for turning on the electric fan on the table. - Already the third in six months I am changing - and again twenty-five: it was almost the engine that screwed up! Toggle switch put something …
But really, what to do if the arrow of the temperature gauge has already crept into the danger zone, and the damned electric fan continues to idle? Yes, and what claims to this fan can be: well, they did not inform him that it was time to turn on - that’s what it is doing.
The true culprit - the TM 108 sensor is impudently silent - it knows, scoundrel, that you still can’t do without it … Not without reason, many automotive publications printed the same “useful” advice several times: so that the harmful item doesn’t bother you, install an additional toggle switch and turn on the fan yourself. It’s very “convenient” - you drive a car and work part-time as a sensor: the motor is hot - you flip the switch in one direction, it cooled slightly - in the other. So with clicks and meet the 21st century …
The collective mind avenged the nasty sensor in an unexpected way. With the advent of a new fuse box for Samara (ЗР, 1999, No. 9), it turned out that the intermediate relay for switching on the electric fan was eliminated as a class on these machines, and therefore the current through the sensor contacts now increases by about two orders of magnitude! Remembering Ohm’s law shyly muttered that this should not be done, but common sense objected: he would die anyway - a week earlier, a week later …
So the enmity became mutual, and the problem was finally confused. Some companies did not wait for its decision and quickly set up serial production of the aforementioned switches, recommending that they be installed even on serviceable cars - sooner or later it will come in handy anyway! Car enthusiasts, who see the root of evil in the sparking of the sensor contacts, started shunting them with suitable semiconductors (ЗР, 1999, No. 12, p. 154), and the helpful market organized an invasion of foreign products into Russia - either Turkish or Emirate. Looking ahead, we note that this time abroad did not help us.
It is curious that the massive failure of the sensors occurred as if imperceptibly for society. Sellers famously sold popular products, servicemen with usual gestures changed one marriage for another, and high authorities turned out to be “not in the know” at all. And only perplexed car owners asked the question: why?
Indeed, if inside there is only a bimetallic plate and a couple of contacts, then why break there? Check - and then
For testing, we purchased seven sensors - two Kaluga TM 108 and four Turkish-Emirate - on average 30 rubles each, as well as one Italian 5134-8C - already for 250 rubles! Each of them was expected to have an “automobile race” with a length of 10, 000 cycles of operations and releases - this corresponds to approximately 30, 000 km. The load is a standard automotive relay, the duration of the cycle is about 2 minutes, the supply voltage is 14 V.
Go … No, we didn’t go - two Turkish Arabs refused to work right away, and after a while their third compatriot, who did not want to commute, joined them. Fellow countrymen of Tsiolkovsky reached the finish line almost without problems, although one of them at the end began to “limp”: a rattling of contacts appeared. “Italian” worked perfectly. The voltage drop across the contacts at a rate of 100 mV for all operational sensors turned out to be approximately the same - 3-5 mV "before" and 28-30 mV "after".
Experts categorically refused to load the sensors directly on the electric fan - they say we are not killers! The upper limit of such products is a current of 1 A. As for the tests, they honestly did not add clarity. Unnamed products should be deported to their historical homeland - we write about this all the time, the “Italian” costs his money - this also does not surprise, but what to do with Kaluga sensors? And what is the main reason for their car failures? Ahead -
The Kaluga Avtopribor plant, which is part of the KZAME holding, is the only (!) Enterprise in the country that has the technology for producing the notorious sensors. But … not the only one letting them out !!!
“Here are the data on the returns of our rejected sensors, ” explains Grigory Biba, Technical Director of the enterprise. - The defectiveness level according to TM 108 is 0.029%, so there is no talk of any landslide marriage. As for our, "sorry" colleagues, please take a look …
Numerous samples of “left” products are laid out on the director's desk. Outside - almost like real ones, but inside … One is stuffed with wire bits to the top, bread crumbs and cherry pours fall out of the other, the third tinkles with rusty nuts, a huge bent washer falls out of the fourth, the fifth is generally empty … Such sensors are called here “winter” "- while the frost is outside, the fan may not be needed, which means there will be no complaints about the sensor. Winter sensor plus cherry pits - why not a “winter cherry”?
“There are, of course, more serious fakes, ” factory workers sigh. - And they will put the contacts, and put a bimetallic plate, but what's the point? We use a special tape bimetal, delivered from Sweden - we cut the blanks from it and use the special molding to provide the desired operating temperature. The craftsman will not cope with this task. Yes, the handicraftsman was over there, the Kolchuginsky plant began to sculpt the same sensors, so you won’t look at them without tears. Leaky, the material is not the same, there is no coating. This is not even suitable for spare parts, not like a conveyor.
How to distinguish a fake by eye? If crooks use stolen cases, then there is almost no chance. But if the cases are also "self-made", then they, as a rule, are machined from a hexagonal bar and have a characteristic luster - the factory ones, on the contrary, are rough, since they are made by casting.
So, are the underground members to blame for everything? No, there are enough official problems too. Take at least the Volga or the Gazelle with the 406th motor - the Nizhny Novgorod residents complain that Kaluga sensors are fooling them. However, not everything is so simple: it turned out that the seat for the TM 108 had such a large rush on the gas radiator that the coolant almost did not touch the sensor surface - hence the unstable operation. A solution has already been found - a new sensor for GAZ has grown by several millimeters and now works fine. As for the product, which was a little "nervous" in our tests, the factory experts are convinced that this will not happen on the car. Nevertheless, the “bully” was left in Kaluga for experiments.
But what about the owners of “Samar”, on which there is no intermediate relay? And here the most interesting part begins - it turns out that the Kaluga people did not deliver TM 108 in Tolyatti a long time ago, since it really can’t work without a relay. Instead, seven years ago, the production of completely new sensors, 66.3710 and 661.3710, designed for switching current of 16 A, began. These modifications differ in response temperature (see table).
In appearance, the new sensors are very similar to the old ones - the difference is in a small tide on the plastic detachable part near one of the terminals (see. Fig.). Products completely replace their predecessors and can work with or without a relay. The exception is all the same Nizhny Novgorod cars - if a Bosch electric fan is installed under their hood, then you can not do without a relay - the current reaches 30 A.
This is called “arrived” - it turns out that there really is no problem! Buy Kaluga sensor and forget about troubles. If marriage is found, contact the factory: they will be replaced and sorted out. But where in this case, under the “Samara” hoods, the TM 108 appears again and again? And why does not one of the car services we interviewed know anything about the new sensors? And where can I buy them?
The last question, as a rule, will knock out any manager of any domestic plant. Kaluzhane withstood the blow, offering to visit the factory store. Well, but where do the residents of other regions and provinces turn to who want to buy a sensor, and not just another “winter cherry”?
Still, the factory workers are great - they are trying. Upon returning to the editorial office, we were already waiting for a fax indicating the telephones of Avtopribor's main dealers - from St. Petersburg to Irkutsk. Let's hope that similar information reaches consumers.
International: on the left - “Kaluzhanin”, on the right - either “Turks”, or “Arab”, in the middle - “Italian”.
Well, why break here? Above is a foreigner, below is a Kaluzhan.
The Kunstkamera is not only in St. Petersburg … You can buy this rubbish in any store.
GAS Sensors - New Longer. Now he does not hide from the coolant.