10. Hot wire sensors: Tungsten is presently the most popular hot wire material. This wire is “hot” in that it has a current passing through it. The other main type of mass air flow sensor is known as a “hot wire sensor.” This type of MAF is also installed in-line between the air filter and the intake manifold, but it doesn’t use a flap. When placed in an air stream the heat is transferred from wire to the air and the temperature of wire reduces. When coated with a thin platinum layer, it becomes more resistant to oxidation. Range 0.015 - 5 m/s, accuracy +/-0.2% of full scale, 1.5% of reading. a) A stationary elevated vantage point b) Satellite c) Skydiving d) Hot air balloon Answer: a 11) A variable reluctance type tachometer has 60 rotor teeth, the records 3600 counts/minutes. The properties of materials used for manufacturing the sensors are presented in Table 1. Self generating type transducers are _____ transducers. Thermo-anemometers use a sensor element that is heated up beyond the ambient temperature. Measurement and Instrumentation Objective Questions 1. standard wire and color code charts The following is a Ford publication that shows the wire colors used for each circuit as well as the circuit numbers for them. The sensor in the hot-wire anemometer is a thin metal wire (see Figure 1) or a film made of a material with a high temperature coefficient of resistance such as tungsten, platinum, platinum-rhodium, and platinum-iridium. and a length of l = 1.60 mm. But, note that this document covers a wide range of years and vehicles, so your vehicle might not have all of the circuits shown. Probe diameter protection basket 110mm, sensing head 8mm, shaft 15mm, probe length 300mm, 1.5 metres of cable Hot-film sensors may also be cylindrical but may also take other forms, such as those that are flush-mounted. The wire is heated to a temperature above the air temperature and the air velocity is determined by the cooling effect of the wire. Magnetic sensor has limited application since they are passage only magnetic detectors. Hot-wire sensors are, as the name implies, made from short lengths of resistance wire and are circular in section. This wire is connected to a measurement bridge and an electrical current is fed through the wire. Airflow moving past the sensor will have a cooling effect that is directly proportional to the flow velocity. Hot Wire Anemometers also known as hot wire flow sensors measure flow rate of air by sensing the amount of heat that is removed from the surface of an element using a single sensor or an array of sensors.A very common use within the automotive industry is to use a hot wire anemometer to monitor the air intake of an engine. The actual tendency is to use a platinum coated tungsten wire coated at the ThermoAir3, Hot Wire Omni-Directional anemometer probe. In this case, its temperature coefficient (0.0032/°C) does not differ too much from that of pure platinum. A Hot Wire Anemometer is an instrument for measuring velocity and direction of fluid (in this case air) by measuring heat loss of an electrically-heated wire placed in the air stream. Hot-film sensors consist of a thin layer of conducting material that has been deposited on a non-conducting substrate. The transducers that converts the input signal into the output signal, which is a discrete function of time is … The Wire support Sensor (thin wire) wire exposed to the wind is made of platinum, with a radius of r = 4.00 um, Figure 1: Hot wire anemometer. 1. The hot-wire anemometer sensor is a very fine wire with a diameter of few micrometers and length of few millimeters. Clarification: The use of the second wire loop on the Magnetometer is to detect presence. Aerial photography uses which basic platform? Instead, there is a thin wire suspended inside the housing. The device speed is a) 60 r.p.s b) 1800 r.p.s c) 3600 r.p.s d) 7200 r.p.s 12) The gauge factor of the material of strain gauge is such that the resistance changes from 1000 ohms to 1009 ohms when subjected to ... Read more Measurements & Instrumentation MCQ ECE Questions Answers a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. There are many anemometer sensor types with one of the most popular being thermo, or hot-wire, anemometers for HVAC air velocity monitoring.
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